Acquisition system, active noise reduction system, method and device

Abstract

The invention provides an acquisition system and an active noise reduction system, method and device, which are applied to the technical field of electronics. The acquisition system comprises a laser transmitting and receiving device, a first coupler and an optical fiber, the laser transmitting and receiving device is connected with the first coupler, and the first coupler is connected with the optical fiber; the laser transmitting and receiving device is used for transmitting first laser. The first coupler is used for transmitting the first laser; the optical fiber is used for forming second laser according to the first laser and sending the second laser to the first coupler; the second laser is different from the first laser in phase; and the first coupler is also used for carrying out interference processing on the second laser, branching according to a preset phase difference to obtain a plurality of third lasers, and sending the plurality of third lasers to the laser transceiving device. The active noise reduction strategy can be optimized, more and more accurate noise signals can be obtained at low cost, and the noise reduction effect is improved.

Description

Technical Field

[0001] The embodiments of the present application relate to the field of electronic technology, and in particular to an acquisition system, an active noise reduction system, a method, and a device. Background Art

[0002] Active noise cancellation (ANC) generates counter-phase sound waves based on external noise to cancel it out, achieving a noise reduction effect. The more signals from this external noise can be captured, the more accurate the counter-phase sound waves will be, and the better the active noise reduction effect will be. However, capturing more signals from this external noise requires more acquisition devices, which increases hardware costs.

[0003] Therefore, how to collect more signals required for active noise reduction at low cost has become a technical problem that needs to be solved urgently. Summary of the Invention

[0004] The present application provides an acquisition system, an active noise reduction system, a method, and an apparatus, which can optimize active noise reduction, collect more signals required for noise reduction at a low cost, and improve the noise reduction effect.

[0005] In order to achieve the above objectives, this application provides the following technical solutions:

[0006] In a first aspect, the present application provides an acquisition system, comprising a laser transceiver, a first coupler, and an optical fiber, wherein the laser transceiver is connected to the first coupler, and the first coupler is connected to the optical fiber. The laser transceiver is configured to emit a first laser; the first coupler is configured to transmit the first laser; the optical fiber is configured to generate a second laser based on the first laser and transmit the second laser to the first coupler; the second laser has a different phase from the first laser; the first coupler is further configured to perform interference processing on the second laser and branch it according to a preset phase difference to obtain multiple third lasers, and transmit the multiple third lasers to the laser transceiver.

[0007] In this application, the noise at the location where the optical fiber senses is determined, and the signal required for noise reduction is determined based on the laser after branching, thereby improving the accuracy of the signal. Moreover, more signals required for noise reduction can be collected at a low cost through the optical fiber, so that subsequent noise reduction can be performed accurately, the noise reduction effect is improved, and the user experience is enhanced.

[0008] In this application, when the fiber vibrates and generates noise, or when the fiber senses noise, it deforms, changing the optical path of the laser light. This in turn causes a phase shift in the laser light as it travels through the fiber. This phase shift indicates a noise-related signal, allowing for subsequent noise reduction.

[0009] According to the first aspect, or any implementation of the first aspect above, the laser transceiver device includes: a laser and a photodetector; the laser is connected to the first coupler, and the photodetector is connected to the first coupler. The laser is configured to emit a first laser beam; the photodetector is configured to perform photoelectric conversion based on a first signal carried by a third laser beam to obtain a second signal, wherein the first signal includes a light intensity signal of the third laser beam; and the second signal includes an analog light intensity signal corresponding to the first signal.

[0010] According to the first aspect, or any implementation of the first aspect above, the system further includes a circulator, the photodetector includes a first photodetector and two second photodetectors; the first port of the circulator is connected to the laser, the second port of the circulator is connected to the first port of the first coupler, and the third port of the circulator is connected to the first photodetector; the second port of the first coupler corresponds to and is connected to the second photodetectors, and the third port of the first coupler is connected to the optical fiber. The circulator is used to receive the first laser from the laser and transmit the first laser to the first coupler; the circulator is also used to receive one of the multiple third lasers from the first coupler and transmit one of the multiple third lasers to the first photodetector; the first coupler is also used to send the other branched third lasers of the multiple third lasers, except for the third laser transmitted by the circulator, to the second photodetectors respectively.

[0011] In this application, the circulator is used to transmit the laser along a predetermined path, which can reduce reflections and interference and improve the accuracy and integrity of the signal.

[0012] According to the first aspect, or any implementation of the first aspect above, the system further includes an isolator and a second coupler, the photodetector includes a first photodetector and two second photodetectors; the first port of the isolator is connected to the laser, the second port of the isolator is connected to the first port of the second coupler, the second port of the second coupler is connected to the first port of the first coupler, and the third port of the second coupler is connected to the first photodetector; the second port of the first coupler corresponds to and is connected to the second photodetectors one by one, and the third port of the first coupler is connected to the optical fiber. The isolator is configured to receive the first laser from the laser and transmit the first laser to the second coupler; the second coupler is configured to transmit the first laser to the first coupler; the second coupler is further configured to receive one of the multiple third lasers from the first coupler and transmit one of the multiple third lasers to the first photodetector; the first coupler is further configured to send the other branched third lasers of the multiple third lasers, except for the third laser transmitted through the circulator, to the second photodetector.

[0013] In the present application, the isolator and the second coupler are used to make the collected data more stable, which is conducive to subsequent accurate noise reduction and optimization of the noise reduction effect.

[0014] According to the first aspect, or any implementation of the first aspect above, the optical fiber includes a first optical fiber, a first port of the first optical fiber connected to the third port of the first coupler, and a second port of the first optical fiber connected to a reflector. The first optical fiber is configured to generate a second laser beam based on the first laser beam and transmit the second laser beam to the first coupler.

[0015] In this application, the placement and number of optical fibers are not restricted, allowing for coverage of more noise types, more noise transmission paths, and the acquisition of more noise-related signals. Furthermore, optical fiber is relatively inexpensive, with minimal signal latency during optical fiber transmission. Fully fixed optical fiber improves stability and coupling. Good coupling ensures high-quality transmission and coherence of optical signals, enabling the acquisition of more accurate, stable, and reliable reference signals, facilitating subsequent accurate noise reduction processing and enhancing the noise reduction effect.

[0016] According to the first aspect, or any implementation of the first aspect above, the optical fiber includes a first optical fiber and a second optical fiber. The first port of the first optical fiber is connected to the fourth port of the first coupler, and the second port of the first optical fiber is connected to the reflector; the first port of the second optical fiber is connected to the fifth port of the first coupler, and the second port of the second optical fiber is connected to the bevel for physical contact; the third port of the first coupler includes the fourth port of the first coupler and the fifth port of the first coupler. The first optical fiber is used to generate a second laser based on the first laser and send the second laser to the first coupler; the second optical fiber is used to transmit the first laser.

[0017] In this application, a beveled physical contact is used in the second optical fiber. The end face of the beveled physical contact is tilted at an angle, which can reflect the laser to the cladding through its bevel angle instead of returning directly to the light source, reducing the number of reflections, thereby reducing the amount of calculation and speeding up the processing speed.

[0018] According to the first aspect, or any implementation of the first aspect above, the optical fiber is fixed on a component to be detected, and the component to be detected is a component that generates noise when the vehicle is running.

[0019] In this application, the optical fiber is fixed to the part to be tested, minimizing fiber displacement and shaking, maintaining the stability, reliability, and accuracy of signal transmission within the fiber, ensuring high-quality transmission and avoiding signal loss. This ensures the stability and accuracy of the signal measured by the optical fiber. It also simplifies subsequent maintenance and repair. Once the optical fiber is fixed, frequent adjustment or calibration is not required, making debugging and maintenance easier.

[0020] In this application, optical fiber costs are low, optical fiber transmission signal latency is minimal, and optical fiber fixation improves optical fiber stability and coupling. Good coupling ensures high-quality transmission and coherence of optical signals, enabling the acquisition of more accurate, stable, and reliable reference signals, which facilitates subsequent accurate noise reduction processing and enhances noise reduction effectiveness.

[0021] According to the first aspect, or any implementation of the first aspect above, the optical fiber is a 0.9 mm optical fiber.

[0022] In this application, the acquisition device in the above implementation does not contain any chips, but only optical devices. The acquisition device is not subject to electromagnetic interference and circuit interference, which can ensure the accuracy and reliability of the data. The acquisition device has a more compact structure, which is conducive to its use in some complex environments and broadens its application scenarios.

[0023] According to the first aspect, or any implementation of the first aspect above, the laser transceiver further includes an analog-to-digital converter and a demodulator; the photodetector is connected to the demodulator via the analog-to-digital converter. The analog-to-digital converter is configured to obtain a second signal from the photodetector and perform mode conversion on the second signal to obtain a corresponding digital signal; the analog-to-digital converter is further configured to transmit the digital signal to the demodulator; and the demodulator is configured to obtain the digital signal from the analog-to-digital converter and demodulate the digital signal to obtain a reference signal.

[0024] In this application, the acquisition device in the above implementation can independently process data and directly output a noise-related reference signal, which can reduce system cost and power consumption and simplify the system structure. Moreover, the data output by the acquisition device can be used directly, making the acquisition system more portable.

[0025] In a second aspect, the present application provides an active noise reduction system, which includes a controller and an acquisition system; the acquisition system is used to output a second signal; the controller is used to perform analog-to-digital conversion and demodulation on the second signal to obtain a reference signal; the controller is also used to perform noise reduction processing based on the reference signal.

[0026] According to the second aspect, or any implementation of the second aspect above, the active noise reduction system also includes a speaker, and the controller is pre-configured with a filter coefficient; the controller is further used to calculate an inverted sound wave based on the reference signal and the filter coefficient, and send the inverted sound wave to the speaker; the speaker is used to make a sound based on the inverted sound wave to cancel the noise.

[0027] According to the second aspect, or any implementation of the second aspect above, the active noise reduction system also includes a microphone and a speaker; the microphone is used to collect an error sound signal of the noise and send the error sound signal to the controller; the controller is also used to calculate a filter coefficient based on the reference signal and the error sound signal; the controller is also used to calculate an inverted sound wave based on the reference signal and the filter coefficient, and send the inverted sound wave to the speaker; the speaker is used to make a sound based on the inverted sound wave to offset the noise.

[0028] In this application, the reference signal measured according to the laser transmitted in the optical fiber and the error sound signal collected by the microphone are different types of signals collected by different devices for the same noise source. The coherence of the reference signal and the error sound signal is good enough. The noise source is reduced by calculating the reverse sound wave based on the reference signal and the error sound signal, which can achieve a good noise reduction effect.

[0029] In a third aspect, the present application provides an active noise reduction system, which includes a controller and an acquisition system; the acquisition system is used to output a reference signal; and the controller is used to perform noise reduction processing according to the reference signal.

[0030] According to the third aspect, or any implementation of the third aspect above, the active noise reduction system also includes a speaker, and the controller is pre-configured with a filter coefficient; the controller is further used to calculate an inverted sound wave based on the reference signal and the filter coefficient, and send the inverted sound wave to the speaker; the speaker is used to make a sound based on the inverted sound wave to cancel the noise.

[0031] According to the third aspect, or any implementation of the third aspect above, the active noise reduction system also includes a microphone and a speaker; the microphone is used to collect an error sound signal of the noise and send the error sound signal to the controller; the controller is also used to calculate a filter coefficient based on the reference signal and the error sound signal; the controller is also used to calculate an inverted sound wave based on the reference signal and the filter coefficient, and send the inverted sound wave to the speaker; the speaker is used to make a sound based on the inverted sound wave to offset the noise.

[0032] In a fourth aspect, the present application provides an active noise reduction method, which is applied to the active noise reduction system as described in the second aspect, and the method includes: obtaining multiple first signals; the first signal is the light intensity signal of the branched laser; obtaining multiple second signals based on the multiple first signals; the second signal is the analog light intensity signal corresponding to the first signal; and performing noise reduction processing based on the multiple second signals.

[0033] According to the fourth aspect, or any implementation of the fourth aspect above, the active noise reduction system includes a first coupler, and the method further includes: emitting a first laser; forming a second laser based on the first laser; the second laser has a different phase from the first laser; branching the second laser to obtain multiple third lasers; the third laser is obtained by branching in the first coupler, and the third laser carries the first signal.

[0034] According to the fourth aspect, or any implementation of the fourth aspect above, obtaining multiple second signals based on the multiple first signals includes: performing photoelectric conversion on the multiple first signals to obtain multiple second signals.

[0035] According to the fourth aspect, or any implementation of the fourth aspect above, the noise reduction processing is performed based on the multiple second signals, including: performing analog-to-digital conversion and demodulation processing on the multiple second signals to obtain a reference signal; and performing noise reduction processing based on the reference signal.

[0036] According to the fourth aspect, or any implementation of the fourth aspect above, the noise reduction processing is performed based on the reference signal, including: calculating an inverted sound wave based on the reference signal and a filter coefficient; the filter coefficient is preconfigured data or data calculated based on the error sound signal of the noise and the reference signal; and performing noise reduction processing based on the inverted sound wave to offset the noise.

[0037] In a fifth aspect, the present application provides an active noise reduction method, which is applied to the active noise reduction system as described in the third aspect, and the method includes: obtaining multiple first signals; the first signal is a light intensity signal of the laser after branching; obtaining a reference signal based on the multiple first signals; and performing noise reduction processing based on the reference signal.

[0038] According to the fifth aspect, or any implementation of the fifth aspect above, the active noise reduction system includes a first coupler, and the method further includes: emitting a first laser; forming a second laser based on the first laser; the second laser has a different phase from the first laser; branching the second laser to obtain multiple third lasers; the third laser is obtained by branching in the first coupler, and the third laser carries the first signal.

[0039] According to the fifth aspect, or any implementation of the fifth aspect above, obtaining a reference signal based on the multiple first signals includes: performing photoelectric conversion, analog-to-digital conversion, and demodulation processing on the multiple first signals to obtain a reference signal.

[0040] According to the fifth aspect, or any implementation of the fifth aspect above, the noise reduction processing is performed based on the reference signal, including: calculating an inverted sound wave based on the reference signal and a filter coefficient; the filter coefficient is preconfigured data or data calculated based on the error sound signal of the noise and the reference signal; and performing noise reduction processing based on the inverted sound wave to offset the noise.

[0041] Aspect 6. The present application provides an active noise reduction method, which is applied to the active noise reduction system as described in the second aspect, and the method includes: obtaining multiple second signals; the second signal is an analog light intensity signal corresponding to the first signal, and the first signal is the light intensity signal of the laser after branching; and performing noise reduction processing according to the multiple second signals.

[0042] According to the sixth aspect, or any implementation of the sixth aspect above, the noise reduction processing is performed based on the multiple second signals, including: performing analog-to-digital conversion and demodulation processing on the multiple second signals to obtain a reference signal; and performing noise reduction processing based on the reference signal.

[0043] According to the sixth aspect, or any implementation of the sixth aspect above, the noise reduction processing is performed based on the reference signal, including: calculating an inverted sound wave based on the reference signal and a filter coefficient; the filter coefficient is preconfigured data or data calculated based on the error sound signal of the noise and the reference signal; and performing noise reduction processing based on the inverted sound wave to offset the noise.

[0044] In a seventh aspect, the present application provides an active noise reduction method, which is applied to the active noise reduction system as described in the third aspect, and the method includes: obtaining a reference signal; the reference signal is obtained by processing the light intensity signal of the branched laser and performing noise reduction processing based on the reference signal.

[0045] According to the seventh aspect, or any implementation of the seventh aspect above, the noise reduction processing is performed based on the reference signal, including: calculating an inverted sound wave based on the reference signal and a filter coefficient; the filter coefficient is preconfigured data or data calculated based on the error sound signal of the noise and the reference signal; and performing noise reduction processing based on the inverted sound wave to offset the noise.

[0046] In an eighth aspect, the present application provides an active noise reduction device, comprising: a processor and a memory, the memory being coupled to the processor, the memory being used to store computer-readable instructions, and when the processor reads the computer-readable instructions from the memory, the active noise reduction device executes the method according to the fourth aspect and any one of the embodiments of the fourth aspect, or the method according to the fifth aspect and any one of the embodiments of the fifth aspect, or the method according to the sixth aspect and any one of the embodiments of the sixth aspect, or the method according to the seventh aspect and any one of the embodiments of the seventh aspect.

[0047] In a ninth aspect, the present application provides a vehicle comprising the active noise reduction system as described in the second aspect, or the active noise reduction system as described in the third aspect, or the active noise reduction device as described in the eighth aspect.

[0048] In the tenth aspect, the present application provides a chip system, which includes at least one processor and at least one interface circuit, the at least one interface circuit is used to perform transceiver functions, and the at least one processor is used to execute the method of the fourth aspect and any one of the embodiments of the fourth aspect, or the method of the fifth aspect and any one of the embodiments of the fifth aspect, or the method of the sixth aspect and any one of the embodiments of the sixth aspect, or the method of the seventh aspect and any one of the embodiments of the seventh aspect.

[0049] In the eleventh aspect, the present application provides a computer-readable storage medium, which includes a computer program. When the computer program is run on a computer, the computer executes the method of the fourth aspect and any one of the embodiments of the fourth aspect, or the method of the fifth aspect and any one of the embodiments of the fifth aspect, or the method of the sixth aspect and any one of the embodiments of the sixth aspect, or the method of the seventh aspect and any one of the embodiments of the seventh aspect.

[0050] The technical effects corresponding to the second to eleventh aspects and any implementation method of each aspect can be referred to the technical effects corresponding to the above-mentioned first aspect and any implementation method of the first aspect, and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] Figure 1 A schematic diagram of the architecture of the acquisition system provided in an embodiment of the present application;

[0052] Figure 2A Schematic diagram of the architecture of the active noise reduction system provided in the embodiment of the present application Figure 1 ;

[0053] Figure 2B Schematic diagram 2 of the architecture of the active noise reduction system provided in an embodiment of the present application;

[0054] Figure 2C Schematic diagram of the architecture of the active noise reduction system provided in the embodiment of the present application Figure 3 ;

[0055] Figure 3 Schematic diagram of the architecture of the active noise reduction system provided in the embodiment of the present application Figure 4 ;

[0056] Figure 4 A schematic diagram of the hardware structure of the active noise reduction device provided in an embodiment of the present application;

[0057] Figure 5 A schematic diagram of the vehicle structure provided in an embodiment of the present application;

[0058] Figure 6 Schematic diagram of the process of the active noise reduction method provided in the embodiment of the present application Figure 1 ;

[0059] Figure 7 A schematic diagram of an active noise reduction scenario provided in an embodiment of the present application;

[0060] Figure 8 Flowchart 2 of the active noise reduction method provided in an embodiment of the present application;

[0061] Figure 9 A schematic diagram of the structure of the active noise reduction device provided in an embodiment of the present application;

[0062] Figure 10 A schematic diagram of the structure of the chip system provided in an embodiment of the present application. DETAILED DESCRIPTION

[0063] In the description of the embodiments of the present application, unless otherwise specified, “ / ” means or, for example, A / B can mean A or B; “and / or” in this article is merely a way to describe the association relationship of associated objects, indicating that three relationships can exist, for example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone.

[0064] In the following, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the quantity of the technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include one or more of the features.

[0065] In the description of the embodiments of the present application, unless otherwise specified, "multiple" means two or more. In the embodiments of the present application, words such as "exemplary" or "for example" are used to indicate examples, illustrations, or descriptions. Any embodiment or design described as "exemplary" or "for example" in the embodiments of the present application should not be interpreted as being more preferred or more advantageous than other embodiments or design. Specifically, the use of words such as "exemplary" or "for example" is intended to present related concepts in a concrete way.

[0066] In some examples, a reference signal of external noise is collected by a sensor, and an anti-phase sound wave is determined based on the reference signal to offset the external noise. Specifically, a vibration reference signal is collected by an accelerometer, and an acoustic reference signal is collected by a microphone. The vibration reference signal and the acoustic reference signal are different types of reference signals generated by the same noise source. If better noise reduction effects are to be achieved, more reference signals need to be collected, which requires more sensors to be arranged at different locations to cover more noise transmission paths, resulting in increased hardware costs. Moreover, the number of sensors and the arrangement positions of sensors in different scenarios are also limited, and too many sensors cannot be arranged. For example, in a vehicle-mounted active noise reduction scenario, sensors cannot be arranged at locations such as windows and windshields.

[0067] In other examples, fiber optic vibrometer technology uses optical fiber vibration to achieve long-distance distributed quantitative measurement. However, achieving quantitative measurement requires energy conversion, calibration, and temperature compensation, which is costly and can only be applied in specific scenarios.

[0068] In order to solve the technical problems described above, embodiments of the present application provide an acquisition system, an active noise reduction system, a method, and an apparatus. The method includes: acquiring multiple first signals, where the first signals are light intensity signals of the split laser, and performing noise reduction processing based on the multiple first signals. The method provided in the embodiment of the present application determines the signal required for noise reduction based on the split laser according to the noise at the location where the optical fiber senses, thereby improving the accuracy of the signal. Moreover, more signals required for noise reduction can be collected at a low cost through the optical fiber, so that subsequent noise reduction can be performed accurately, the noise reduction effect is improved, and the user experience is enhanced.

[0069] The technical solutions in the embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments.

[0070] The active noise reduction method in the embodiments of this application can be applied to any active noise reduction scenario. Optionally, the active noise reduction scenario includes vehicle noise reduction, industrial equipment noise reduction, communication equipment noise reduction, household appliance noise reduction, and other scenarios. The embodiments of this application do not place any particular restrictions on the specific form of the active noise reduction scenario.

[0071] The following uses the vehicle noise reduction scenario as an example to illustrate the active noise reduction technology of this application.

[0072] In some embodiments of the present application, reference is made to Figure 1 , Figure 1 FIG. 1 shows a collection system 10 provided in an embodiment of the present application. Figure 1 As shown, the acquisition system 10 includes a laser transceiver 11, a first coupler 12 and an optical fiber 13. The laser transceiver 11, the first coupler 12 and the optical fiber 13 are connected and communicated with each other. For the convenience of representation, Figure 1 In the figure, only one thick line is used to represent the optical fiber 13, but this does not mean that there is only one optical fiber or one type of optical fiber.

[0073] In this embodiment of the present application, a laser transceiver 11 is configured to emit a first laser beam. A first coupler 12 is configured to transmit the first laser beam. An optical fiber 13 is configured to generate a second laser beam from the first laser beam and transmit the second laser beam to the first coupler 12; the second laser beam has a different phase than the first laser beam. The first coupler 12 is further configured to perform interference processing on the second laser beam and generate multiple third laser beams according to predetermined phase differences, and transmit the multiple third laser beams to the laser transceiver 11.

[0074] In some examples, the laser transceiver 11 includes a laser and a photodetector ( Figure 1 The laser is connected to the first coupler 12, and the photodetector is connected to the first coupler 12.

[0075] Specifically, the laser is used to emit a first laser; the photodetector is used to perform photoelectric conversion based on the first signal carried by the above-mentioned third laser to obtain a second signal, the above-mentioned first signal includes the light intensity signal of the above-mentioned third laser; the above-mentioned second signal includes the analog light intensity signal corresponding to the above-mentioned first signal.

[0076] In some possible implementations, the acquisition system 10 further includes a circulator ( Figure 1 (not shown), the photodetectors include a first photodetector and two second photodetectors. The first port of the circulator is connected to the laser, the second port of the circulator is connected to the first port of the first coupler 12, and the third port of the circulator is connected to the first photodetector. The second port of the first coupler 12 is connected to the second photodetector in a one-to-one correspondence, and the third port of the first coupler 12 is connected to the optical fiber 13.

[0077] Specifically, the circulator is used to receive the first laser from the laser and transmit the first laser to the first coupler 12; the circulator is also used to receive one of the multiple third lasers from the first coupler 12 and transmit one of the multiple third lasers to the first photodetector; the first coupler 12 is also used to send the other branched third lasers among the above multiple third lasers except the third laser transmitted by the circulator to the second photodetector respectively.

[0078] In some other possible implementations, the isolator and the second coupler may replace the circulator, and the acquisition system 10 further includes the isolator and the second coupler ( Figure 1 (not shown), the photodetector includes a first photodetector and two second photodetectors. The first port of the isolator is connected to the laser, and the second port of the isolator is connected to the first port of the second coupler; the second port of the second coupler is connected to the first port of the first coupler 12, and the third port of the second coupler is connected to the first photodetector; the second port of the first coupler 12 is connected to the second photodetector in a one-to-one correspondence, and the third port of the first coupler 12 is connected to the optical fiber 13.

[0079] Specifically, the isolator is used to receive the first laser from the laser and transmit the first laser to the second coupler; the second coupler is used to transmit the first laser to the first coupler 12; the second coupler is also used to receive one of the multiple third lasers from the first coupler 12 and transmit one of the multiple third lasers to the first photodetector; the first coupler 12 is used to send the other branched third lasers among the multiple third lasers except the third laser transmitted through the circulator to the second photodetector respectively.

[0080] It is understandable that the embodiment of the present application does not limit the number of the third laser beams after branching, nor does it limit the number of the photodetectors. The number of the third laser beams after branching is the same as the number of the photodetectors.

[0081] In some examples, optical fiber 13 includes a first optical fiber, a first port of the first optical fiber is connected to the third port of first coupler 12, and a second port of the first optical fiber is connected to a reflective mirror. The first optical fiber is configured to generate a second laser beam based on the first laser beam and transmit the second laser beam to first coupler 12.

[0082] In some examples, optical fiber 13 includes a first optical fiber and a second optical fiber. The first port of the first optical fiber is connected to the fourth port of the first coupler 12, and the second port of the first optical fiber is connected to the reflector. The first port of the second optical fiber is connected to the fifth port of the first coupler 12, and the second port of the second optical fiber is connected to the bevel for physical contact. The third port of the first coupler 12 includes the fourth port of the first coupler 12 and the fifth port of the first coupler 12. The first optical fiber is used to generate a second laser beam based on the first laser beam and send the second laser beam to the first coupler 12. The second optical fiber is used to transmit the first laser beam.

[0083] In some examples, the optical fiber 13 is fixed to a component to be detected, which is a component that generates noise when the vehicle is running, such as a window, chassis, etc.

[0084] In some examples, the size of the optical fiber satisfies a preset range or a preset value, for example, the optical fiber is a 0.9 mm optical fiber, or the size of the optical fiber satisfies a predetermined difference from the preset data.

[0085] It should be understood that the acquisition system 10 in the above example does not include any chips, but only contains optical devices, which can ensure the accuracy of the data. The structure of the acquisition system without a processing chip is more compact.

[0086] In some examples, the laser transceiver 11 further includes an analog-to-digital converter and a demodulator ( Figure 1 (shown in Figure 2 ). The photodetector is connected to the demodulator via an analog-to-digital converter. Specifically, the analog-to-digital converter is configured to obtain a second signal from the photodetector and perform mode conversion on the second signal to obtain a corresponding digital signal. The analog-to-digital converter is further configured to transmit the digital signal to the demodulator. The demodulator is configured to obtain the digital signal from the analog-to-digital converter and demodulate the digital signal to obtain a reference signal.

[0087] It should be understood that in the above example, the acquisition system 10 includes a processing chip that can independently process data and directly output a noise-related reference signal so that the device can perform noise reduction based on the reference signal. An acquisition system including a processing chip is more portable.

[0088] It is understood that the aforementioned laser transceiver 11, first coupler 12, and optical fiber 13 constitute the acquisition system 10. By collecting noise-related signals through optical fiber, the acquisition method for the signals required for noise reduction is broadened. Furthermore, after the first coupler divides the laser light into multiple laser paths, multiple calculations can be performed simultaneously, thereby increasing computation speed and shortening computation time. Multiple laser paths can be processed in parallel, enabling more detailed and precise calculations, improving accuracy, reducing computational errors, and enhancing reliability. This saves computational resources and costs, and also improves the reliability and fault tolerance of the acquisition system.

[0089] It is understood that the above examples are only for explaining the architecture of the acquisition system 10. Those skilled in the art will understand that Figure 1 The structure of the acquisition system shown in the figure does not constitute a limitation to the acquisition system, and the acquisition system may include more or fewer components than shown in the figure, or combine certain components, or arrange the components differently.

[0090] In some embodiments of the present application, reference is made to Figure 2A , Figure 2A FIG. 1 shows an active noise reduction system 100 provided in an embodiment of the present application. Figure 2A As shown, the active noise reduction system 100 includes an acquisition module 110 and an active noise reduction device 120. The acquisition module 110 and the active noise reduction device 120 are connected and communicated with each other.

[0091] In the embodiment of the present application, the acquisition module 110 may be configured to collect noise-related signals and send the signals to the active noise reduction device 120 .

[0092] In the embodiment of the present application, the active noise reduction device 120 may be configured to perform noise reduction processing according to the signal received from the acquisition module 110 .

[0093] Optionally, the active noise reduction device 120 can also be an intelligent driving computing platform. The intelligent driving computing platform is a computing platform that implements intelligent driving, decision-making, planning, control, and other functions, and is a core component of the entire vehicle. The intelligent driving computing platform interacts with various components in the vehicle, obtains data from each component, and controls the operation of each component. For example, the active noise reduction device 120 includes a controller (which can also be described as a processor) and a speaker. The controller is used to control the speaker to perform noise reduction processing based on the signal.

[0094] Optionally, the active noise reduction device 120 may also be a server. As an example, the active noise reduction device 120 may be a server of an intelligent transportation system, such as a physical server or a cloud server, which is not limited in this embodiment of the present application.

[0095] It will be appreciated that in the above example, the acquisition module 110 and the active noise reduction device 120 in the active noise reduction system 100 are independent components. The acquisition module 110 and the active noise reduction device 120 exchange data to achieve active noise reduction. In actual applications, the acquisition module 110 and the active noise reduction device 120 can be deployed on the same component. For example, if the active noise reduction device 120 is an intelligent driving computing platform, the acquisition module 110 can be deployed and integrated on the active noise reduction device 120. The active noise reduction device 120 integrates various components to achieve active noise reduction.

[0096] In other embodiments of the present application, reference is made to Figure 2B , Figure 2BFIG. 2 shows another active noise reduction system 200 provided in an embodiment of the present application. Figure 2B As shown, the active noise reduction system 200 includes an acquisition system 201, a controller 250, a microphone 260, and a speaker 270. The components in the active noise reduction system 200 are connected and communicated with each other.

[0097] Alternatively, the active noise reduction system 200 may include more or fewer components, and each component may include multiple elements. The components and elements in the active noise reduction system 200 may be interconnected by wire or wirelessly.

[0098] In the embodiment of the present application, the acquisition system 201 includes a laser transceiver 210 , a circulator 220 , a first coupler 230 , and an optical fiber 240 .

[0099] In the embodiment of the present application, the laser transceiver 210 (also described as a laser transceiver device) may include a laser diode (LD) 211, a photodetector (PD) 212, and a trans-impedance amplifier (TIA) 213. The laser transceiver 210 is used to transmit laser light and measure the interference of the laser light waves. For example, the laser transceiver 210 is a Michelson interferometer or a Mach-Zehnder interferometer.

[0100] Specifically, the laser 211 is connected to the first port of the circulator 220. The laser 211 is used to emit a first laser beam, which is the laser beam emitted by the laser transceiver 210.

[0101] Specifically, photodetector 212 is configured to receive a third laser beam and perform photoelectric conversion based on the first signal carried by the third laser beam to obtain a second signal. The third laser beam is the laser beam obtained by branching the second laser beam, and there may be multiple third laser beams. The second laser beam is the laser beam resulting from the phase shift of the first laser beam during transmission through optical fiber 240. The second laser beam and the first laser beam have different phases. The first signal is the light intensity signal of the third laser beam, and the second signal is the analog light intensity signal corresponding to the first signal.

[0102] It is understood that the present application does not limit the number of photodetectors 212 , and the photodetectors 212 can be connected to different components.

[0103] In the embodiment of the present application, the photodetector 212 includes a first photodetector connected to the circulator 220 and two second photodetectors connected to the first coupler 230 .

[0104] Specifically, the transimpedance amplifier 213 is connected to the photodetector 212 and is configured to amplify the signal. The transimpedance amplifier 213 receives the second signal from the photodetector 212 and amplifies the second signal. The transimpedance amplifier 213 is also configured to transmit the amplified second signal to the controller 250. For example, the transimpedance amplifier 213 transmits the amplified analog light intensity signal to the controller 250.

[0105] Optionally, the laser transceiver 210 may further include a bayonet nut connector (BNC) ( Figure 2B (not shown), the snap-fit ​​connector connects the transimpedance amplifier 213 and the controller 250, and the snap-fit ​​connector is used to transmit the amplified second signal.

[0106] In the embodiment of the present application, the circulator 220 includes a first port, a second port, and a third port. The first port of the circulator 220 is connected to the laser 211, the second port of the circulator 220 is connected to the first port of the first coupler 230, and the third port of the circulator is connected to the first photodetector.

[0107] It should be understood that by using a circulator to transmit laser light along a predetermined path, reflections and interference can be reduced, thereby improving the accuracy and integrity of the signal.

[0108] Specifically, the circulator 220 is configured to receive the first laser light from the laser 211 and transmit the first laser light to the first coupler 230. The circulator 220 is also configured to receive one of the plurality of third laser lights from the first coupler 230 and transmit the one of the plurality of third laser lights to the first photodetector.

[0109] In the embodiment of the present application, the first port of the first coupler 230 is connected to the circulator 220, the second port of the first coupler 230 is connected to the second photodetector in a one-to-one correspondence, and the third port of the coupler is connected to the optical fiber 240. For example, the coupler is a 3*3 coupler.

[0110] Specifically, the first coupler 230 is used to couple the first laser to the optical fiber 240. The first coupler 230 is also used to receive the second laser, which interferes in the first coupler 230. The first coupler 230 is also used to split the second laser into multiple third lasers according to a preset phase difference, and transmit the third lasers to the photodetector.

[0111] In some examples, the first coupler 230 is further configured to transmit one of the plurality of third lasers to the circulator 220 , and to send the other branched third lasers of the plurality of third lasers except the third laser transmitted by the circulator 220 to the second photodetector.

[0112] Exemplary, reference Figure 2B For example, a 3x3 coupler is used, where the second laser beam is split into three third laser beams (e.g., third laser beam 1, third laser beam 2, and third laser beam 3), and the photodetector 212 includes one first photodetector and two second photodetectors. First coupler 230 transmits one of the three third laser beams (e.g., third laser beam 1) to circulator 220, and transmits the other two third laser beams (e.g., third laser beam 2 and third laser beam 3) of the three third laser beams, excluding the one transmitted by circulator 220, to the second photodetectors.

[0113] In the embodiment of the present application, the optical fiber 240 is fixed to a component to be detected, which is a component that generates noise when the vehicle is running, such as a window, chassis, engine, etc. The number of optical fibers can be multiple.

[0114] In some examples, the optical fiber 240 includes a first optical fiber, a first port of the first optical fiber is connected to the third port of the first coupler 230, and a second port of the first optical fiber is connected to the reflector 241. For example, the reflector 241 is a Faraday reflector.

[0115] Specifically, the first optical fiber is used to generate a second laser according to the first laser and send the second laser to the first coupler 230 .

[0116] It should be understood that in this application, when the optical fiber is fixed to the vehicle and vibrations occur at the location where the optical fiber is located, generating noise, or when the optical fiber senses noise, the optical fiber will deform, changing the optical path of the laser light, which in turn causes a phase shift in the laser light as it propagates through the optical fiber. In other words, vibrations cause a phase shift in the laser light within the optical fiber, and noise-related signals can be determined based on this phase shift.

[0117] In other examples, to reduce the amount of data calculation, optical fiber 240 includes a first optical fiber and a second optical fiber. The first port of the first optical fiber is connected to the fourth port of the first coupler 230, and the second port of the first optical fiber is connected to the reflector 241. The first port of the second optical fiber is connected to the fifth port of the first coupler 230, and the second port of the second optical fiber is connected to an angled physical contact (APC) 242 (also described as an APC bevel). The third port of the first coupler 230 includes the fourth port and the fifth port of the coupler.

[0118] Specifically, the first optical fiber is used to generate the second laser light according to the first laser light and send the second laser light to the first coupler 230 ; the second optical fiber is used to transmit the first laser light.

[0119] It should be understood that an APC bevel is used in the second optical fiber. The end face of the APC bevel is tilted at an angle (usually 8 degrees). This allows the laser to be reflected to the cladding through its bevel angle instead of returning directly to the light source (i.e., no reflection). This can reduce the number of reflections, thereby alleviating the amount of calculation and speeding up the processing speed.

[0120] It can be understood that the above-mentioned laser transceiver 210, circulator 220, first coupler 230, and optical fiber 240 constitute the acquisition system 201, which collects noise-related signals through optical fiber, broadens the method of obtaining the signals required for noise reduction, and improves the diversity and accuracy of noise data.

[0121] In this application, low-cost optical fibers are used, and the acquisition system 201 can arrange optical fibers at multiple locations on the vehicle. The placement and number of optical fibers are not limited, and more types of noise, more noise transmission paths, and more noise-related signals can be covered. Furthermore, optical fibers are relatively low in cost, have low signal latency during optical fiber transmission, and are completely fixed, which improves their stability and coupling. Good coupling ensures high-quality transmission and coherence of optical signals, allowing for the acquisition of more accurate, stable, and reliable reference signals, which facilitates subsequent accurate noise reduction processing and enhances the noise reduction effect.

[0122] In the embodiment of the present application, the controller 250 may include an analog digital converter (ADC) 251, a demodulator 252, and a filter 253. The controller 250 is used to process the second signal sent by the laser transceiver 210 and perform noise reduction processing based on the processed signal.

[0123] Specifically, the analog-to-digital converter 251 is connected to the transimpedance amplifier 213 in the laser transceiver 210 and the demodulator 252 in the controller 250. The analog-to-digital converter 251 is used to receive the amplified electrical signal second signal transmitted from the transimpedance amplifier 213, and perform analog-to-digital conversion on the amplified second signal to obtain a corresponding digital signal. The analog-to-digital converter 251 is also used to send the digital signal obtained after the analog-to-digital conversion to the demodulator 252. For example, the analog-to-digital converter 250 receives the amplified analog light intensity signal transmitted from the transimpedance amplifier 213, performs analog-to-digital conversion on it to obtain a corresponding digital signal, and then sends the digital signal to the demodulator 252.

[0124] Specifically, the demodulator 252 is connected to the analog-to-digital converter 251 and the filter 253. The demodulator 252 is configured to receive the digital signal transmitted from the analog-to-digital converter 251 and demodulate the digital signal to obtain a reference signal. The demodulator 252 is also configured to send the reference signal to the filter 253.

[0125] Specifically, filter 253 is connected to demodulator 252, microphone 260, and speaker 270. Filter 253 is configured to receive a reference signal sent from demodulator 252. Filter 253 is also configured to obtain an error sound signal from microphone 260. Filter 253 is further configured to calculate filter coefficients based on the reference signal and the error sound signal, and to calculate an inverted sound wave based on the filter coefficients and the reference signal. Filter 253 is further configured to control speaker 270 to emit the inverted sound wave to cancel noise.

[0126] In another implementation, filter 253 is preconfigured with filter coefficients, so filter 253 does not need to obtain the error sound signal from microphone 260 to calculate the filter coefficients. In other words, active noise reduction system 200 may not include microphone 260. Filter 253 calculates the antiphase sound wave based on the reference signal and the preconfigured filter coefficients.

[0127] In the embodiment of the present application, the microphone 260 is used to collect an error acoustic signal of the noise generated by the vibration at the location of the optical fiber 240 or an error acoustic signal of the noise sensed by the optical fiber 240 , and send the error acoustic signal to the filter 253 .

[0128] In the embodiment of the present application, the speaker 270 emits the anti-phase sound wave calculated by the filter 253 to cancel the noise.

[0129] Next, the processing flow of each component in the active noise reduction system 200 is described according to the laser emission, transmission, reflection, and processing paths. Figure 2B , the following is explained by taking a 3*3 coupler, two first optical fibers, one second optical fiber, one first photodetector, two second photodetectors, and three transimpedance amplifiers 213 as an example.

[0130] In the embodiment of the present application, laser 211 emits a first laser beam, which enters circulator 220 through the first port of circulator 220. The first laser beam is output through the second port of circulator 220 and transmitted to first coupler 230 through the first port of first coupler 230. First coupler 230 couples the first laser beam into optical fiber 240. The first port of a second optical fiber in optical fiber 240 is connected to first coupler 230, and the second port is connected to APC bevel 242. The second optical fiber transmits the first laser beam but does not reflect it. The first port of a first optical fiber in optical fiber 240 is connected to first coupler 230, and the second port is connected to reflector 241. The first optical fiber transmits the first laser beam. When the first laser beam is transmitted in the first optical fiber, vibration or noise at the location of the first optical fiber causes a phase change, forming a second laser beam. The second laser beam is then transmitted from the first port of the first optical fiber to first coupler 230. The second laser beam interferes in first coupler 230. First coupler 230 splits the second laser beam into three third laser beams with a 120° phase difference: third laser beam 1, third laser beam 2, and third laser beam 3. The first coupler 230 sends the split laser beams to photodetectors, which include a first photodetector, a second photodetector 1, and a second photodetector 2. The third laser beam 1 is transmitted through the first port of the coupler to the second port of the circulator, and then through the third port of the circulator to the first photodetector. The third laser beam 2 and the third laser beam 3 are transmitted from the second port of the first coupler 230 to the second photodetector 1 and the second photodetector 2, respectively. The first photodetector performs photoelectric conversion based on the first signal carried by the third laser beam 1 to obtain the second signal 1, the second photodetector 1 performs photoelectric conversion based on the first signal carried by the third laser beam 2 to obtain the second signal 2, and the second photodetector 2 performs photoelectric conversion based on the first signal carried by the third laser beam 3 to obtain the second signal 3. The converted second signals (second signal 1, second signal 2, second signal 3) are amplified by the transimpedance amplifier 213 and transmitted to the analog-to-digital converter 251.

[0131] The analog-to-digital converter 251 in the controller 250 performs analog-to-digital conversion on the three amplified second signals to obtain corresponding digital signals (digital signal 1, digital signal 2, and digital signal 3), and then sends the digital signals to the demodulator 252. The demodulator 252 demodulates the digital signals to obtain a reference signal, and sends the reference signal to the filter 253. The filter 253 calculates filter coefficients based on the reference signal obtained from the demodulator 252 and the error sound signal obtained from the microphone 260. The filter 253 then calculates an inverted sound wave based on the reference signal and the filter coefficients. The filter 253 is also used to control the speaker 280 to emit the inverted sound wave to cancel the noise.

[0132] It is understood that the active noise reduction system 200 in the embodiment of the present application utilizes low-cost optical fiber. The reference signal measured by the laser transmitted through the optical fiber and the error acoustic signal collected by the microphone are different types of signals collected by different devices from the same noise source. The reference signal and the error acoustic signal have sufficient coherence. By calculating the reverse acoustic wave based on the reference signal and the error acoustic signal to reduce the noise source, effective noise reduction can be achieved. Furthermore, the optical fiber can be positioned at different locations on the vehicle, covering more noise transmission paths and capturing more noise-related signals. This enables low-cost acquisition of more noise-related signals, thereby enhancing the noise reduction effect.

[0133] It is understood that in the above example, laser transceiver 210 does not contain any chips, only optical components. Laser transceiver 210 is immune to electromagnetic interference and circuit interference, ensuring data accuracy and reliability. Signal processing is performed uniformly by controller 250. The more compact structure of laser transceiver 210 facilitates its use in complex environments, broadening its application scenarios.

[0134] In some other embodiments of the present application, reference is made to Figure 2C , Figure 2C FIG. 3 shows another active noise reduction system 300 provided in an embodiment of the present application. Figure 2C As shown, the active noise reduction system 300 includes an acquisition system 301, a controller 350, and a speaker 360. The components in the active noise reduction system 300 are connected and communicated with each other.

[0135] Alternatively, the active noise reduction system 300 may include more or fewer components, and each component may include multiple elements. The components and elements in the active noise reduction system 300 may be interconnected by wire or wirelessly.

[0136] In the embodiment of the present application, the acquisition system 301 includes a laser transceiver 310 , a circulator 320 , a first coupler 330 , and an optical fiber 340 .

[0137] In the embodiment of the present application, the laser transceiver 310 may include a laser 311 , a photodetector 312 , a transimpedance amplifier 313 , an analog-to-digital converter 314 and a demodulator 315 .

[0138] Specifically, the specific functions and connection methods of the laser 311, the photodetector 312, and the transimpedance amplifier 313 are as described above for the active noise reduction system 200, and will not be repeated here.

[0139] Specifically, the analog-to-digital converter 314 is connected to the transimpedance amplifier 313 and the demodulator 315. The analog-to-digital converter 314 is configured to receive the amplified second signal transmitted from the transimpedance amplifier 313 and perform analog-to-digital conversion on the amplified second signal to obtain a corresponding digital signal. The analog-to-digital converter 314 is further configured to transmit the digital signal obtained after the analog-to-digital conversion to the demodulator 315.

[0140] Specifically, the demodulator 315 is connected to the analog-to-digital converter 314 and the controller 350 . The demodulator 315 is configured to receive the digital signal sent from the analog-to-digital converter 314 and demodulate the digital signal to obtain a reference signal. The demodulator 315 is also configured to send the reference signal to the controller 350 .

[0141] In the embodiment of the present application, the specific functions and connection methods of the circulator 320 , the first coupler 330 , and the optical fiber 340 are similar to those described above for the active noise reduction system 200 and are not described again here.

[0142] In the embodiment of the present application, the controller 350 includes a filter 351. The filter 351 includes preconfigured filter coefficients.

[0143] Specifically, filter 351 is connected to demodulator 315 and speaker 360. Filter 351 is configured to receive a reference signal sent from demodulator 315 and calculate an inverse sound wave based on the reference signal and preconfigured filter coefficients. Filter 351 is also configured to control speaker 360 to emit the inverse sound wave.

[0144] In the embodiment of the present application, the speaker 360 emits anti-phase sound waves based on the control of the filter to offset the noise and achieve noise reduction.

[0145] It can be understood that the analog-to-digital converter 314 and demodulator 315 in the active noise reduction system 300 are configured in the laser transceiver 310, and the laser transceiver 310 performs analog-to-digital conversion and demodulation processing to obtain a reference signal, and outputs the reference signal to the filter so that the filter calculates the anti-phase sound wave based on the reference signal to offset the noise and achieve noise reduction.

[0146] By way of example, the processing flow of each component in the active noise reduction system 300 is described by taking a 3*3 coupler as the coupler, two first optical fibers, one second optical fiber, one first photodetector, two second photodetectors, and three transimpedance amplifiers 213 as an example.

[0147] In this embodiment of the present application, laser 311 emits a first laser beam, which enters circulator 320 through the first port of circulator 320. The first laser beam is output through the second port of circulator 320 and transmitted to first coupler 330 through the first port of first coupler 330. First coupler 330 couples the first laser beam into optical fiber 340. The first port of a second optical fiber in optical fiber 340 is connected to first coupler 330, and the second port is connected to APC bevel 342. The second optical fiber transmits the first laser beam but does not reflect it. The first port of a first optical fiber in optical fiber 340 is connected to first coupler 330, and the second port is connected to reflector 341. The first optical fiber transmits the first laser beam. When the first laser beam propagates through the first optical fiber, vibration or noise at the location of the first optical fiber causes a phase change, forming a second laser beam. The second laser beam is then transmitted from the first port of the first optical fiber to first coupler 330. The second laser beam interferes in first coupler 330. First coupler 330 splits the second laser beam into three third laser beams with a 120° phase difference: third laser beam 1, third laser beam 2, and third laser beam 3. The first coupler 330 transmits the split laser beams to photodetectors, which include a first photodetector, a second photodetector 1, and a second photodetector 2. Third laser beam 1 is transmitted through the first port of the coupler to the second port of the circulator, and then through the third port of the circulator to the first photodetector. Third laser beam 2 and third laser beam 3 are transmitted from the second port of the first coupler 330 to the second photodetector 1 and the second photodetector 2, respectively. The first photodetector performs photoelectric conversion based on the first signal carried by the third laser beam 1 to obtain second signal 1. The second photodetector 1 performs photoelectric conversion based on the first signal carried by the third laser beam 2 to obtain second signal 2. The second photodetector 2 performs photoelectric conversion based on the first signal carried by the third laser beam 3 to obtain second signal 3. The converted second signals (second signal 1, second signal 2, and second signal 3) are amplified by the transimpedance amplifier 213 and transmitted to the analog-to-digital converter 314. The analog-to-digital converter 314 performs analog-to-digital conversion on the three amplified second signals to obtain corresponding digital signals (digital signal 1, digital signal 2, and digital signal 3), which are then transmitted to the demodulator 315. The demodulator 315 demodulates the digital signal to obtain a reference signal, and sends the reference signal to the filter 351 .

[0148] The filter 351 in the controller 350 calculates an anti-phase sound wave based on the reference signal obtained from the demodulator 315 and pre-configured filter coefficients. The filter 351 is also used to control the speaker 360 to emit the anti-phase sound wave to cancel the noise.

[0149] It will be appreciated that the laser transceiver 310 of the acquisition system 301 in the above example can independently process data, independent of the controller 350. The reference signal processed by the laser transceiver 310 can be used directly, without requiring additional processing by the controller 350. This reduces system costs and power consumption. Furthermore, it simplifies the system architecture, making it more flexible and scalable.

[0150] In some other embodiments of the present application, the circulator in the active noise reduction system 200 and the active noise reduction system 300 can be replaced with an isolator and a coupler. Figure 3 , Figure 3 Another active noise reduction system 400 provided in an embodiment of the present application is shown. The active noise reduction system includes an acquisition system 401, a controller 450, a microphone 460, and a speaker 470. The components in the active noise reduction system 400 are connected and communicate with each other.

[0151] Alternatively, the active noise reduction system 400 may include more or fewer components, and each component may include multiple elements. The components and elements in the active noise reduction system 400 may be interconnected by wire or wirelessly.

[0152] In the embodiment of the present application, the acquisition system 401 includes a laser transceiver 410 , an isolator 420 , a second coupler 421 , a first coupler 430 , and an optical fiber 440 .

[0153] In the embodiment of the present application, the laser transceiver device 410 may include a laser 411 , a photodetector 412 and a cross-group amplifier 413 .

[0154] Exemplary, reference Figure 3 , the photodetector 412 includes a first photodetector and two second photodetectors.

[0155] In this embodiment of the present application, the first port of isolator 420 is connected to laser 411, the second port of isolator 420 is connected to the first port of the second coupler, and the fourth port of isolator is connected to the APC bevel. The isolator is configured to receive the first laser light from laser 411 and transmit the first laser light to second coupler 421.

[0156] In the embodiment of the present application, the second port of the second coupler 421 is connected to the first port of the first coupler 430, and the third port of the second coupler 421 is connected to the first photodetector. The second coupler 421 is configured to transmit the first laser beam to the first coupler 430. The second coupler 421 is also configured to receive one of the plurality of third laser beams from the first coupler 430 and transmit the one of the plurality of third laser beams to the first photodetector.

[0157] In the embodiment of the present application, the controller 450 may include an analog-to-digital converter 451 , a demodulator 452 and a filter 453 .

[0158] It is understandable that the specific implementation of other components in the active noise reduction system 400 can be found in the above active noise reduction system 200, which will not be repeated here.

[0159] In this application, the function of the circulator is realized by the isolator 420 and the second coupler 421, which broadens the architecture of the acquisition system and the active noise reduction system, making the collected data more stable, which is conducive to subsequent accurate noise reduction and optimization of the noise reduction effect.

[0160] It is understood that the isolator and the second coupler can also be replaced Figure 2C The circulator 320 in the active noise reduction system 300 is shown. The embodiment of the present application does not limit the specific architecture and specific implementation of the active noise reduction system.

[0161] The various modules in the above-mentioned active noise reduction system are divided according to functional logic, and other division methods may be used in practice. In addition, the above-mentioned modules can be named otherwise. In addition, each module can be implemented by hardware, software, or a combination of hardware and software. Whether a specific module is implemented in hardware, software, or a combination of hardware and software depends on the specific application and design constraints of the technical solution. Different modules can be implemented by different hardware, and multiple modules can also be implemented by the same hardware. The embodiments of this application do not specifically limit this.

[0162] It is understood that the active noise reduction system 10, active noise reduction system 200, active noise reduction system 300, and active noise reduction system 400 in the above examples are possible system architectures of active noise reduction systems. The embodiments of the present application do not limit the specific implementation of the system architecture of the active noise reduction system.

[0163] It can be understood that the system architecture and business scenarios described in this application are intended to more clearly illustrate the technical solutions of this application, and do not constitute the sole limitation on the technical solutions provided by this application. Ordinary technicians in this field can know that with the evolution of the system architecture and the emergence of new business scenarios, the technical solutions provided by this application are also applicable to similar technical problems.

[0164] refer to Figure 4 , Figure 4 FIG. 1 shows a hardware structure of the active noise reduction device 120 provided in an embodiment of the present application.

[0165] like Figure 4As shown, the active noise reduction device 120 includes a processor 41, a memory 42, a communication interface 43, and a bus 44. The processor 41, the memory 42, and the communication interface 43 may be connected via the bus 44.

[0166] The processor 41 is used to manage and control the active noise reduction device 120 and / or to execute the active noise reduction method described below. The memory 42 is used to store program code and data of the active noise reduction device 120. The communication interface 43 is used to support communication between the active noise reduction device 120 and other network entities.

[0167] The processor 41 (or controller) is the control center of the active noise reduction device 120 and can implement or execute various exemplary logic blocks, unit modules, and circuits described in conjunction with the disclosure of this application. The processor or controller can be a general-purpose central processing unit (CPU), a general-purpose processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field programmable gate array or other programmable logic device, a transistor logic device, a hardware component, or any combination thereof. The general-purpose processor can be a microprocessor or any conventional processor. The processor 41 can also be a combination that implements computing functions, such as a combination of one or more microprocessors, a combination of a digital signal processor and a microprocessor, etc.

[0168] As an example, the processor 41 may include one or more CPUs, such as Figure 4 CPU 0 and CPU1 are shown in Figure 1.

[0169] The memory 42 may be a read-only memory (ROM) or other type of static storage device capable of storing static information and instructions, a random access memory (RAM) or other type of dynamic storage device capable of storing information and instructions, a flash memory, a hard disk, or a solid-state drive; an electrically erasable programmable read-only memory (EEPROM), a magnetic disk storage medium, or other magnetic storage device, or any other medium capable of carrying or storing desired program code in the form of instructions or data structures and accessible by a computer, but is not limited thereto. The memory 42 may also include a combination of the aforementioned types of memory.

[0170] In one possible implementation, memory 42 may exist independently of processor 41. Memory 42 may be connected to processor 41 via bus 44 and used to store data, instructions, or program code. When processor 41 calls and executes the instructions or program code stored in memory 42, the active noise reduction method provided in the embodiments of the present application can be implemented.

[0171] In another possible implementation, the memory 42 may also be integrated with the processor 41 .

[0172] Communication interface 43 is used to connect the active noise reduction device 120 to other devices (such as acquisition module 11) via a communication network. The communication network can be a transceiver circuit, Ethernet, a radio access network (RAN), a wireless local area network (WLAN), etc. Communication interface 43 may include a receiving unit for receiving data and a transmitting unit for sending data.

[0173] The bus 44 may be an ISA bus, a PCI bus, or an EISA bus. The bus may be divided into an address bus, a data bus, a control bus, and the like. For ease of presentation, Figure 4 Only one thick line is used in the diagram, but this does not mean that there is only one bus or one type of bus.

[0174] It should be pointed out that Figure 4 The structure shown in the figure does not constitute a limitation on the active noise reduction device 120, except Figure 4 In addition to the components shown, the active noise reduction device 120 may include more or fewer components than shown, or combine certain components, or arrange the components differently.

[0175] Figure 5 This is a schematic diagram of the structure of a vehicle 500 provided in an embodiment of the present application. Figure 5 , vehicle 500 may include various subsystems, such as a travel system 510 , a sensor system 520 , a control system 530 , one or more peripheral devices 540 , as well as a power source 550 , a computer system 560 , and a user interface 570 .

[0176] Alternatively, vehicle 500 may include more or fewer subsystems, and each subsystem may include multiple components. In addition, each subsystem and component of vehicle 500 may be interconnected by wire or wirelessly.

[0177] Propulsion system 510 may include components that provide powered motion for vehicle 500. Engine 511 may be an electric motor or other types of engine combinations. Engine 511 converts energy source 512 into mechanical energy. Examples of energy source 512 include solar panels, batteries, and other sources of electricity. Transmission 513 may transmit mechanical power from engine 511 to wheels 514.

[0178] The sensor system 520 may include a number of sensors that sense information about the environment surrounding the vehicle 500. For example, the sensor system 520 may include a positioning system 521, such as a global positioning system (GPS), a BeiDou system, or other positioning systems, an inertial measurement unit (IMU) 522, a radar 523, a laser rangefinder 524, and a camera 525.

[0179] Control system 530 controls the operation of vehicle 500 and its components. Control system 530 may include various components, including a steering system 531, a throttle 532, a brake unit 533, a computer vision system 534, a path control system 535, and an obstacle avoidance system 536, which may also be referred to as an obstacle avoidance system.

[0180] Vehicle 500 interacts with external sensors, other vehicles, other computer systems, or users via peripheral devices 540. Peripheral devices 540 may include a wireless communication system 541, an onboard computer 542, a microphone 543, and / or a speaker 544.

[0181] Power source 550 may provide power to various components of vehicle 500 .

[0182] Some or all functions of vehicle 500 are controlled by computer system 560. Computer system 560 may include at least one processor 561 that executes instructions 5621 stored in a non-transitory computer-readable medium such as memory 562. Computer system 560 may also be a plurality of computing devices that control individual components or subsystems of vehicle 500 in a distributed manner.

[0183] The processor 561 may be any conventional processor, such as a commercially available central processing unit (CPU). Alternatively, the processor may be a dedicated device such as an application-specific integrated circuit (ASIC) or other hardware-based processor.

[0184] In some embodiments, memory 562 may include instructions 5621 (e.g., program logic) that are executable by processor 561 to perform various functions of vehicle 500. Memory 562 may also include additional instructions, including instructions for sending data to, receiving data from, interacting with, and / or controlling one or more of travel system 510, sensor system 520, control system 530, and peripherals 540.

[0185] In addition to instructions 5621, memory 562 may also store data such as road maps, route information, the vehicle's location, direction, speed, and other vehicle data, and other information. This information may be used by vehicle 500 and computer system 560 during operation of vehicle 500 in autonomous, semi-autonomous, and / or manual modes.

[0186] The user interface 570 is used to provide information to or receive information from a user of the vehicle 500 .

[0187] Computer system 560 may control functions of vehicle 500 based on input received from various subsystems (eg, travel system 510 , sensor system 520 , and control system 530 ) and from user interface 570 .

[0188] In some embodiments, the vehicle 500 may further include a vehicle controller (not shown). Figure 5 The vehicle controller, also referred to as a powertrain controller or intelligent driving computing platform, is the core control component of the entire vehicle. It collects input from various systems and components, makes decisions based on that input, and controls the actions of various components within vehicle 500, driving the vehicle.

[0189] Specifically, as the command and management center for vehicle 500, the vehicle controller's primary functions include: driving torque control, optimized braking energy control, vehicle energy management, active noise reduction, controller area network (CAN) maintenance and management, fault diagnosis and troubleshooting, and vehicle status monitoring. It controls vehicle operation. Therefore, the quality of the vehicle controller directly determines the stability and safety of the vehicle.

[0190] Alternatively, one or more of the above components may be installed or associated separately from the vehicle 500. For example, the memory 562 may be partially or completely separate from the vehicle 500. The above components may be communicatively coupled together in a wired and / or wireless manner.

[0191] Optionally, the above components are just an example. In actual applications, the components in the above modules may be added or deleted according to actual needs. Figure 5 It should not be understood as limiting the embodiments of the present application.

[0192] The vehicle 500 may be a new energy vehicle, an electric vehicle, a car, a truck, a motorcycle, a bus, a boat, an airplane, a helicopter, a lawn mower, an amusement vehicle, an amusement park vehicle, construction equipment, a tram, a golf cart, or a train, etc., and is not particularly limited in this embodiment of the present application. The vehicle may be powered by gasoline, diesel, electricity, solar energy, hydrogen energy, etc.

[0193] In other embodiments of the present application, the vehicle may further include hardware structures and / or software modules to implement the aforementioned functions in the form of hardware structures, software modules, or a combination of hardware structures and software modules. Whether a particular one of the aforementioned functions is implemented in the form of hardware structures, software modules, or a combination of hardware structures and software modules depends on the specific application and design constraints of the technical solution.

[0194] The method provided in the embodiments of the present application is described below with reference to the accompanying drawings.

[0195] In order to optimize the active noise reduction strategy, collect more signals required for noise reduction at a low cost, and optimize the noise reduction effect, this application proposes an active noise reduction method, which can be executed by a vehicle or other equipment outside the vehicle, or by a processor on the vehicle or other equipment outside the vehicle, such as the processor 41 or processor 561 mentioned above.

[0196] refer to Figure 6 , Figure 6 A schematic diagram of a process flow of an active noise reduction method provided by an embodiment of the present application is shown, which is applied to Figure 2B or Figure 3 The active noise reduction system shown in the figure includes the following S601-S603:

[0197] S601. The vehicle controller obtains a plurality of first signals; the first signals are light intensity signals of the split lasers.

[0198] In the embodiments of this application, the vehicle controller is the core control component of the vehicle, such as the intelligent driving computing platform. The vehicle controller receives signals collected by various vehicle components, makes corresponding judgments and decisions based on these signals, and then controls the operation of various vehicle components based on these decisions, thereby controlling the vehicle's driving or braking.

[0199] In the embodiment of the present application, the vehicle controller may also be a controller of a component or a system in the vehicle.

[0200] In an embodiment of the present application, the optical fiber is arranged on the vehicle, and the optical fiber is used to sense signals when vibration generates noise at the location, or the optical fiber senses signals of noise near the location.

[0201] In the embodiment of the present application, vehicle-related noise includes engine noise, exhaust system noise, fan noise, transmission system noise, tire noise, brake noise, wind-induced noise, body structure noise, etc.

[0202] In one possible implementation, optical fibers are arranged near noise-generating components (also described as parts to be detected) in a vehicle or along a noise transmission path to monitor various types of noise and obtain signals related to each type of noise for noise reduction processing.

[0203] For example, optical fibers can be placed on glass to detect noise signals generated by glass vibration. Alternatively, optical fibers can be placed near tires to detect noise signals generated by tire friction with the ground. Alternatively, optical fibers can be placed near the engine to detect noise signals generated by the engine during vehicle startup, acceleration, deceleration, braking, and driving.

[0204] For example, see Figure 7 , install an optical fiber (bare fiber can be used) on the rear glass window of the vehicle. One installation method is to install the optical fiber in the glass interlayer. Another installation method is to stick the optical fiber on the glass by sticking a heating wire on the glass surface. The embodiment of the present application does not limit the installation method of the optical fiber. When the rear glass window vibrates, the optical fiber is deformed, the optical path of the laser in the optical fiber changes, and then the phase of the laser is changed when it is transmitted in the light.

[0205] It is understandable that the embodiments of the present application do not limit the optical fiber.

[0206] Understandably, to ensure the stability and accuracy of the signal measured by the optical fiber and avoid signal drift, the optical fiber needs to be completely fixed to the vehicle to minimize fiber displacement and shaking. This maintains the stability, reliability, and accuracy of the signal transmission within the fiber, ensuring high-quality transmission and avoiding signal loss. This also simplifies subsequent maintenance and repairs. Once the optical fiber is fixed, frequent adjustment or calibration is not required, making commissioning and maintenance easier.

[0207] It is understandable that this application uses low-cost optical fibers, which are arranged at multiple locations on the vehicle. The placement and number of optical fibers are not limited, and more types of noise can be covered, more noise transmission paths can be covered, and more noise-related signals can be obtained. In addition, optical fiber costs are low, optical fiber transmission signal delay is small, and the complete fixation of optical fiber can improve the stability of optical fiber, thereby improving the coupling of optical fiber. Good coupling can ensure high-quality transmission and coherence of optical signals, obtain more accurate, stable and reliable reference signals, and facilitate subsequent accurate noise reduction processing to improve the noise reduction effect.

[0208] In an embodiment of the present application, the active noise reduction system includes a first coupler, and before the vehicle controller obtains multiple first signals, it also includes: emitting a first laser; forming a second laser based on the first laser, the second laser having a different phase from the first laser, and branching the second laser to obtain multiple third lasers, the third lasers are obtained by branching through the first coupler, and the third lasers carry the first signal.

[0209] In one possible implementation, the second laser beam is split into a plurality of third laser beams according to a preset phase difference. For example, the second laser beam is split into three third laser beams according to a phase difference of 120°. The third laser beams have a phase difference of 120°.

[0210] In the present application, the laser is divided into multiple paths, the original signal is split into multiple optical paths and transmitted to different paths, which can improve the reliability and fault tolerance of data transmission and facilitate the subsequent accurate calculation of the second signal.

[0211] Exemplarily, based on the example of the above-mentioned active noise reduction system, the vehicle controller further includes a laser transceiver (i.e., the above-mentioned laser transceiver 210 or laser transceiver 310 or laser transceiver 410), which includes a laser for emitting a first laser. A first coupler is used to couple the first laser to an optical fiber. The optical fiber is used to form a second laser based on the first laser, and the second laser has a different phase from the first laser. The first coupler is also used to branch the second laser according to a preset phase difference to obtain multiple third lasers, and send the multiple third lasers to the laser transceiver.

[0212] It can be understood that if the position where the optical fiber is located vibrates (vibration will cause the optical fiber to deform) or the optical fiber senses noise at the position where the optical fiber is located (noise causes the optical fiber to deform through sound waves), the optical fiber will deform, and the optical path of the first laser in the optical fiber will change, thereby generating a phase change to form a second laser, and the phase of the second laser is different from the phase of the first laser.

[0213] It should be understood that in this application, when the optical fiber is deployed on a vehicle and vibrations at the location of the optical fiber generate noise, or when the optical fiber senses noise, the optical fiber will deform, changing the optical path of the laser within the fiber. This in turn causes a phase shift in the laser light as it propagates through the fiber. In other words, vibrations cause a phase shift in the laser light within the fiber, and this phase shift can be used to determine a noise-related reference signal.

[0214] S602. The vehicle controller obtains multiple second signals based on the multiple first signals; the second signals are simulated light intensity signals corresponding to the first signals.

[0215] In the embodiment of the present application, photoelectric conversion is performed on the plurality of first signals to obtain the plurality of second signals.

[0216] Exemplarily, the laser transceiver of the vehicle controller further includes a photoelectric detector, and the vehicle controller performs photoelectric conversion on the first signal through the photoelectric detector to obtain the second signal.

[0217] It can be understood that the second signal is a simulated light signal intensity change signal obtained by photoelectric conversion of the light intensity signal of the third laser light carrying phase change.

[0218] S603: The vehicle controller performs noise reduction processing according to the multiple second signals.

[0219] In an embodiment of the present application, the vehicle controller performs analog-to-digital conversion and demodulation on the above-mentioned multiple second signals to obtain a reference signal; and the vehicle controller performs noise reduction processing based on the reference signal.

[0220] In an embodiment of the present application, the vehicle controller performs noise reduction processing based on the reference signal, including: calculating an inverted sound wave based on the reference signal and a filter coefficient; the filter coefficient is preconfigured data or data calculated based on the error sound signal of the noise and the above-mentioned reference signal; the vehicle controller performs noise reduction processing based on the inverted sound wave to offset the noise.

[0221] Exemplarily, the vehicle controller further includes a controller and a speaker, wherein the controller includes an analog-to-digital converter, a demodulator, and a filter. The vehicle controller performs analog-to-digital conversion on the plurality of second signals via the analog-to-digital converter to obtain corresponding digital signals; the vehicle controller demodulates the digital signals via the demodulator to obtain a reference signal; the vehicle controller calculates an inverted sound wave using the filter based on the reference signal and filter coefficients; the filter coefficients are preconfigured data or data calculated based on an error sound signal of the noise and the reference signal; and the vehicle controller emits the inverted sound wave through the speaker to cancel the noise.

[0222] In some examples, a filter of the vehicle controller is configured with filter coefficients, and the vehicle controller calculates the inverse phase sound wave based on the reference signal and the pre-configured filter coefficients.

[0223] It is understood that, in the above example, the vehicle controller calculates the processing method of the anti-phase sound wave as described above. Figure 2C As shown, no further details are given here.

[0224] In other examples, the vehicle controller further includes a microphone configured to collect an error acoustic signal of noise generated by vibration at the optical fiber location or an error acoustic signal of noise sensed by the optical fiber. A filter in the vehicle controller calculates filter coefficients based on the error acoustic signal collected by the microphone and a reference signal, and calculates a reverse acoustic wave based on the filter coefficients and the reference signal.

[0225] It is understood that, in the above example, the vehicle controller calculates the processing method of the anti-phase sound wave as described above. Figure 2B As shown, no further details are given here.

[0226] In the present application, the fiber optic vibration measurement technology is applied to active noise reduction in the above-mentioned manner, and low-cost optical fibers are sampled, with low hardware costs. By arranging optical fibers at different positions, more types of noise can be covered, more noise transmission paths can be covered, and more noise-related signals can be obtained. When the vibration at the location of the optical fiber generates noise, or when the optical fiber senses noise, the optical fiber will deform, causing the laser to change phase when it is transmitted in the optical fiber. The noise-related signal is processed according to the laser carrying the phase change signal, and noise reduction processing is performed based on the processed signal. The optical fiber transmission signal has a small time delay and good optical path coupling, which can obtain more accurate, stable and reliable noise-related signals, and then perform accurate noise reduction processing to improve the noise reduction effect. The active noise reduction method provided in the present application optimizes the active noise reduction strategy, obtains more and more accurate noise-related signals at a low cost, and improves the noise reduction effect.

[0227] refer to Figure 8 , Figure 8 A schematic diagram showing another active noise reduction method provided by an embodiment of the present application is shown, which is applied to Figure 2C The active noise reduction system shown in the figure includes the following S801-S803:

[0228] S801. The vehicle controller obtains a plurality of first signals; the first signals are light intensity signals of the split lasers.

[0229] In the embodiment of the present application, the specific implementation method of the vehicle controller obtaining multiple first signals is shown in S601 above and will not be repeated here.

[0230] S802: The vehicle controller obtains a reference signal according to the multiple first signals.

[0231] In an embodiment of the present application, the vehicle controller obtains a reference signal based on the above-mentioned multiple first signals, including: the vehicle controller performs photoelectric conversion, analog-to-digital conversion, and demodulation processing on the above-mentioned multiple first signals to obtain the reference signal.

[0232] S803: The vehicle controller performs noise reduction processing according to the reference signal.

[0233] In the embodiment of the present application, the specific implementation method of the vehicle controller performing noise reduction processing according to the reference signal is shown in S603 above and will not be repeated here.

[0234] It is understandable that the vehicle controller in the active noise reduction method of the above example is a controller that can control the active noise reduction system as a whole, and multiple components in the vehicle controller (such as the laser transceiver and the controller) interact to implement the active noise reduction method.

[0235] In other examples, the active noise reduction method may also be implemented only by a controller in the active noise reduction system.

[0236] In some possible implementations, the controller acquires multiple second signals; the second signal is an analog light intensity signal corresponding to the first signal, and the first signal is a light intensity signal of the laser after branching; the controller performs noise reduction processing based on the multiple second signals.

[0237] In some other possible implementations, the controller obtains a reference signal, which is obtained by processing the light intensity signal of the split laser; and the controller performs noise reduction processing based on the reference signal.

[0238] It is understandable that the specific implementation of the active noise reduction method by the controller is as described above and will not be repeated here.

[0239] Combination of the above Figures 1-8 The active noise reduction method provided in the embodiment of the present application is described in detail. The above mainly introduces the solution provided in the embodiment of the present application from the perspective of the method. In order to realize the above functions, it includes hardware structures and / or software modules corresponding to the execution of each function. Those skilled in the art should easily realize that, in combination with the units and algorithm steps of each example described in the embodiments disclosed herein, the present application can be implemented in the form of hardware or a combination of hardware and computer software. Whether a function is executed in a hardware or computer software driven hardware manner depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.

[0240] In the embodiment of the present application, the active noise reduction system can be divided into functional modules according to the above method example. For example, each functional module can be divided according to each function, or two or more functions can be integrated into one processing module. The above integrated modules can be implemented in the form of hardware or software functional modules. It should be noted that the division of modules in the embodiment of the present application is schematic and is only a logical functional division. In actual implementation, there may be other division methods.

[0241] Figure 9 A possible structural diagram of the active noise reduction device involved in the above embodiment is shown as follows: Figure 9 As shown, the active noise reduction device 900 may include an acquisition unit 901 and a processing unit 902. The active noise reduction device 900 is used to perform the above-mentioned active noise reduction method, for example, Figure 6-Figure 8 Of course, the active noise reduction device 900 may also include other modules, or the active noise reduction device 900 may include fewer modules. This embodiment of the present application is not limited to this.

[0242] Optional, Figure 9 The active noise reduction device 900 shown may further include a storage unit ( Figure 9 (not shown), the storage unit stores a program or instruction. When the acquisition unit 901 and the processing unit 902 execute the program or instruction, Figure 9 The active noise reduction device 900 shown can execute the active noise reduction method described in the above method embodiment.

[0243] The operations and / or functions of each unit in the active noise reduction device 900 are respectively for implementing the corresponding processes of the active noise reduction method described in the above method embodiment. All relevant contents of each step involved in the above method embodiment can be referred to the functional description of the corresponding functional unit. For the sake of brevity, they are not repeated here.

[0244] Figure 9 The technical effects of the active noise reduction device 900 shown can refer to the technical effects of the active noise reduction method described in the above method embodiment, and will not be repeated here.

[0245] As an example, combined with Figure 4 The functions implemented by the acquisition unit 901 and the processing unit 902 in the active noise reduction device 900 can be achieved by Figure 4 Processor 41 in the Figure 4 The program code in the memory 42 is implemented.

[0246] The present application also provides a chip system. Figure 10As shown, the chip system 1000 includes at least one processor 1001 and at least one interface circuit 1002. As an example, when the chip system 1000 includes one processor and one interface circuit, the one processor may be Figure 10 The processor 1001 shown in the solid line frame (or the processor 1001 shown in the dotted line frame) may be Figure 10 The interface circuit 1002 is shown in the solid line frame (or the interface circuit 1002 is shown in the dotted line frame). When the chip system 1000 includes two processors and two interface circuits, the two processors include Figure 10 The processor 1001 shown in the solid line frame and the processor 1001 shown in the dotted line frame, the two interface circuits include Figure 10 The interface circuit 1002 shown in the solid line frame and the interface circuit 1002 shown in the dotted line frame are not limited to this.

[0247] The processor 1001 and the interface circuit 1002 can be interconnected via a line. For example, the interface circuit 1002 can be used to receive signals. For another example, the interface circuit 1002 can be used to send signals to other devices (such as the processor 1001). Exemplarily, the interface circuit 1002 can read instructions stored in the memory and send the instructions to the processor 1001. When the instructions are executed by the processor 1001, the firewall device can execute the various steps in the above embodiment. Of course, the chip system can also include other discrete components, which are not specifically limited in the embodiments of the present application.

[0248] Exemplarily, the chip system can be a field programmable gate array (FPGA), an application-specific integrated circuit (ASIC), a system on a chip (SoC), a central processing unit (CPU), a network processor (NP), a digital signal processor (DSP), a microcontroller unit (MCU), a programmable logic device (PLD) or other integrated chips.

[0249] It should be understood that each step in the above method embodiment can be completed by hardware integrated logic circuits in a processor or by software instructions. The method steps disclosed in the embodiments of the present application can be directly embodied as being executed by a hardware processor, or by a combination of hardware and software modules in a processor.

[0250] An embodiment of the present application further provides a computer-readable storage medium storing one or more computer programs, wherein the one or more computer programs include instructions that, when executed by a computer, enable the computer to execute the corresponding process of the model compression method in the above embodiment.

[0251] In some embodiments, the disclosed methods may be implemented as computer program instructions encoded in a machine-readable format on a computer-readable storage medium or on other non-transitory media or articles of manufacture.

[0252] An embodiment of the present application also provides a computer program product. When the computer program product is run on a computer, it enables the computer to execute the above-mentioned related steps to implement the model compression method in the above-mentioned embodiment.

[0253] The apparatus, computer-readable storage medium, computer program product, or chip provided in the embodiments of the present application are all used to execute the corresponding methods provided above. Therefore, the beneficial effects that can be achieved can refer to the beneficial effects of the corresponding methods provided above, and will not be repeated here.

[0254] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of this application. Therefore, the scope of protection of this application should be based on the scope of protection of the claims.

Claims

1. A collection system, characterized in that: The acquisition system includes a laser transceiver, a first coupler and an optical fiber, wherein the laser transceiver is connected to the first coupler, and the first coupler is connected to the optical fiber; The laser transceiver is used to emit a first laser; The first coupler is used to transmit the first laser; The optical fiber is used to form a second laser according to the first laser and send the second laser to the first coupler; the second laser is different in phase from the first laser; The first coupler is further configured to subject the second laser to interference processing, and to branch the second laser according to a preset phase difference to obtain a plurality of third lasers, and to send the plurality of third lasers to the laser transceiver.

2. The system according to claim 1, wherein: The laser transceiver device includes: a laser and a photodetector; the laser is connected to the first coupler, and the photodetector is connected to the first coupler; The laser is used to emit a first laser; The photoelectric detector is used to obtain a second signal by performing photoelectric conversion based on the first signal carried by the third laser, where the first signal includes the light intensity signal of the third laser; and the second signal includes the analog light intensity signal corresponding to the first signal.

3. The system according to claim 2, characterized in that The system further includes a circulator, the photodetector including a first photodetector and two second photodetectors; The first port of the circulator is connected to the laser, the second port of the circulator is connected to the first port of the first coupler, and the third port of the circulator is connected to the first photodetector; The second port of the first coupler corresponds to and is connected to the second photodetector in a one-to-one manner, and the third port of the first coupler is connected to the optical fiber; The circulator is configured to receive the first laser light from the laser and transmit the first laser light to the first coupler; The circulator is further configured to receive one of the plurality of third lasers from the first coupler and transmit the one of the plurality of third lasers to the first photodetector; The first coupler is further configured to send the other branched third laser beams among the plurality of third laser beams except the third laser beam transmitted through the circulator to the second photodetector respectively.

4. The system according to claim 2, wherein: The system further includes an isolator and a second coupler, and the photodetector includes a first photodetector and two second photodetectors; The first port of the isolator is connected to the laser, the second port of the isolator is connected to the first port of the second coupler, the second port of the second coupler is connected to the first port of the first coupler, and the third port of the second coupler is connected to the first photodetector; The second port of the first coupler corresponds to and is connected to the second photodetector in a one-to-one manner, and the third port of the first coupler is connected to the optical fiber; The isolator is configured to receive the first laser light from the laser and transmit the first laser light to the second coupler; The second coupler is used to transmit the first laser to the first coupler; The second coupler is further configured to receive one of the plurality of third lasers from the first coupler and transmit the one of the plurality of third lasers to the first photodetector; The first coupler is further configured to send the other branched third laser beams among the plurality of third laser beams except the third laser beam transmitted through the circulator to the second photodetector respectively.

5. The system according to any one of claims 1 to 4, characterized in that The optical fiber includes a first optical fiber, a first port of the first optical fiber is connected to the third port of the first coupler, and a second port of the first optical fiber is connected to the reflector. The first optical fiber is used to form a second laser according to the first laser and send the second laser to the first coupler.

6. The system according to any one of claims 1 to 4, characterized in that The optical fiber includes a first optical fiber and a second optical fiber, wherein the first port of the first optical fiber is connected to the fourth port of the first coupler, and the second port of the first optical fiber is connected to the reflector; the first port of the second optical fiber is connected to the fifth port of the first coupler, and the second port of the second optical fiber is connected to the bevel for physical contact; The third port of the first coupler includes the fourth port of the first coupler and the fifth port of the first coupler; The first optical fiber is used to form a second laser according to the first laser and send the second laser to the first coupler; The second optical fiber is used to transmit the first laser.

7. The system according to any one of claims 1 to 6, characterized in that The optical fiber is fixed on a component to be detected, and the component to be detected is a component that generates noise when the vehicle is running.

8. The system according to any one of claims 1 to 7, characterized in that The optical fiber is a 0.9 mm optical fiber.

9. The system according to any one of claims 2 to 8, characterized in that The laser transceiver device further includes an analog-to-digital converter and a demodulator; the photodetector is connected to the demodulator via the analog-to-digital converter; The analog-to-digital converter is configured to obtain a second signal from the photodetector and perform mode conversion on the second signal to obtain a corresponding digital signal; The analog-to-digital converter is further configured to transmit the digital signal to the demodulator; The demodulator is used to obtain the digital signal from the analog-to-digital converter and demodulate the digital signal to obtain a reference signal.

10. An active noise reduction system, characterized in that: The active noise reduction system comprises a controller and an acquisition system according to any one of claims 1 to 8; The acquisition system is used to output a second signal; The controller is configured to perform analog-to-digital conversion and demodulation on the second signal to obtain a reference signal; The controller is further configured to perform noise reduction processing according to the reference signal.

11. The system according to claim 10, wherein: The active noise reduction system further includes a speaker, and the controller is pre-configured with filter coefficients; The controller is further configured to calculate an inverted sound wave based on the reference signal and the filter coefficient, and send the inverted sound wave to the speaker; The loudspeaker is used to produce sound according to the anti-phase sound wave to offset the noise.

12. The system according to claim 10, wherein: The active noise reduction system also includes a microphone and a speaker; The microphone is used to collect an error sound signal of the noise and send the error sound signal to the controller; The controller is further configured to calculate filter coefficients based on the reference signal and the error acoustic signal; The controller is further configured to calculate an inverted sound wave based on the reference signal and the filter coefficient, and send the inverted sound wave to the speaker; The loudspeaker is used to produce sound according to the anti-phase sound wave to offset the noise.

13. An active noise reduction method, characterized in that: Applied to the active noise reduction system according to any one of claims 10 to 12, the method comprises: Acquire multiple first signals; the first signals are light intensity signals of the split laser; Obtain multiple second signals according to the multiple first signals; the second signals are analog light intensity signals corresponding to the first signals; Noise reduction processing is performed according to the multiple second signals.

14. The method according to claim 13, characterized in that The active noise reduction system includes a first coupler, and the method further includes: firing a first laser; forming a second laser beam based on the first laser beam; wherein the second laser beam has a different phase from the first laser beam; The second laser is branched to obtain a plurality of third lasers; the third lasers are branched in the first coupler to obtain the third lasers, and the third lasers carry the first signal.

15. The method according to claim 13 or 14, characterized in that The obtaining of a plurality of second signals according to the plurality of first signals comprises: The plurality of first signals are photoelectrically converted to obtain a plurality of second signals.

16. The method according to any one of claims 13 to 15, characterized in that The performing noise reduction processing according to the plurality of second signals includes: Performing analog-to-digital conversion and demodulation on the multiple second signals to obtain a reference signal; Noise reduction processing is performed according to the reference signal.

17. The method according to any one of claims 13 to 16, characterized in that The performing noise reduction processing according to the reference signal includes: The inverse phase sound wave is calculated based on the reference signal and the filter coefficient; the filter coefficient is pre-configured data or data calculated based on the error sound signal of the noise and the reference signal Noise reduction processing is performed based on the anti-phase sound wave to cancel the noise.

18. An active noise reduction method, characterized in that: Applied to the active noise reduction system according to any one of claims 10 to 12, the method comprises: Acquire multiple second signals; the second signals are analog light intensity signals corresponding to the first signals, and the first signal is the light intensity signal of the split laser; Noise reduction processing is performed according to the multiple second signals.

19. The method according to claim 18, characterized in that The performing noise reduction processing according to the plurality of second signals includes: Performing analog-to-digital conversion and demodulation on the multiple second signals to obtain a reference signal; Noise reduction processing is performed according to the reference signal.

20. The method according to claim 18 or 19, characterized in that The performing noise reduction processing according to the reference signal includes: Calculate an inverse phase sound wave according to the reference signal and a filter coefficient; the filter coefficient is pre-configured data or data calculated according to the error sound signal of the noise and the reference signal; Noise reduction processing is performed based on the anti-phase sound wave to cancel the noise.

21. A vehicle, characterized in that: The vehicle comprises the active noise reduction system according to any one of claims 10-12.

22. A computer-readable storage medium, characterized in that The computer-readable storage medium comprises a computer program, and when the computer program is run on a computer, the computer is caused to perform the method according to any one of claims 13 to 17 or the method according to any one of claims 18 to 20.

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