A noise reduction processing device and system

Abstract

The application discloses a noise reduction processing device and system, the system comprises: a noise collection sensor, a speaker, a microphone and a noise reduction processing device, wherein the noise collection sensor is used for sending a noise signal to a first input interface of the noise reduction processing device; the microphone is used for sending a noise feedback signal to a second input interface of the noise reduction processing device; the noise reduction processing device is used for sending a noise cancellation signal to the speaker through a first output interface, the noise cancellation signal is generated based on the noise signal and the noise feedback signal; wherein at least one of the second input interface and the first output interface is a wireless interface. The noise can be reduced, the wire harness can be saved, and the wiring difficulty and cost can be reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of vehicle noise reduction, and in particular to a noise reduction processing device and system. BACKGROUND

[0002] With the development of intelligent vehicles, people have higher and higher requirements for the ride experience of vehicles. However, the external environment of the vehicle, the chassis of the vehicle, the engine compartment, the rotation of the tire, etc. can all cause noise in the vehicle, which seriously affects the comfort of the ride.

[0003] Currently, the noise reduction method in the vehicle has the problems of complex wire harness deployment and high cost. SUMMARY

[0004] The present application discloses a noise reduction processing device and system, which can reduce the noise in the vehicle, save the wire harness, and reduce the wiring difficulty and deployment cost.

[0005] In a first aspect, the present application provides a noise reduction processing system, which comprises a noise collection sensor, a speaker, a microphone and a noise reduction processing device, wherein the noise collection sensor is configured to send a noise signal to a first input interface of the noise reduction processing device; the microphone is configured to send a noise feedback signal to a second input interface of the noise reduction processing device;

[0006] The noise reduction processing device is configured to send a noise cancellation signal to the speaker through a first output interface, the noise cancellation signal being generated based on the noise signal and the noise feedback signal; and at least one of the second input interface and the first output interface is a wireless interface.

[0007] Here, the microphone can also be referred to as an error microphone. The microphone may, for example, be an original microphone on the vehicle or a vehicle-mounted microphone, or a special microphone deployed for noise reduction, or a microphone temporarily connected by a user.

[0008] Exemplarily, the microphone has two working modes, one of which is a voice collection mode, i.e. a traditional mode, for example, for collecting a voice signal, which can carry voice instructions, singing or voice in a call; the other is a noise collection mode, which can be applied to the noise reduction scene of the present application, for collecting a noise feedback signal.

[0009] In one implementation, in the noise reduction scene, the working mode of the microphone can be selected as the noise collection mode.

[0010] In another implementation, in the noise reduction scene, both working modes of the microphone can be selected at the same time.

[0011] Exemplarily, the first input interface is a wired interface or a wireless interface.

[0012] Exemplarily, in the case that the number of noise collection sensors is multiple, a part of noise signals collected by the noise collection sensors can be transmitted through a wired transmission, and another part of noise signals collected by the noise collection sensors can be transmitted through a wireless transmission. In this case, the first input interface can include both a wired interface and a wireless interface.

[0013] In the above method, the noise cancellation signal generated by the noise reduction processing device based on the noise signal and the noise feedback signal can be used to realize vehicle active noise reduction. In the noise reduction process, the time delay of the secondary path (i.e., the path from the noise collection sensor to the noise reduction processing device to the loudspeaker) needs to be less than the time delay of the main path from the noise collection sensor to the human ear. The time delay of the secondary path is related to three time delays, which are the time delay of the noise signal from the noise sensor to the noise reduction processing device, the time delay of the noise feedback signal from the microphone to the noise reduction processing device, and the time delay of the noise cancellation signal from the noise reduction processing device to the loudspeaker. The second input interface is used to receive the noise feedback signal collected by the microphone, and the first output interface is used to send the noise cancellation signal to the loudspeaker. At least one of the second input interface and the first output interface is a wireless interface, which not only saves the wire harness and reduces the deployment difficulty and cost of the wire harness of the noise reduction processing system, but also ensures that the time delay of the secondary path is less than the time delay of the main path, thereby reducing noise.

[0014] In a possible implementation of the first aspect, at least one of the second input interface and the first output interface is a wireless interface, including:

[0015] Both the second input interface and the first output interface are wireless interfaces.

[0016] The second input interface is a wireless interface, and the first output interface is a wired interface; or

[0017] The second input interface is a wired interface, and the first output interface is a wireless interface.

[0018] Taking the case that the second input interface is a wired interface and the first output interface is a wireless interface as an example, the noise feedback signal is transmitted through wired communication, which can effectively avoid environmental interference and ensure low-delay transmission of the noise feedback signal. The noise cancellation signal is transmitted through wireless communication, which can save the wire harness and reduce the deployment difficulty of the wire harness.

[0019] In a possible implementation manner of the first aspect, the wireless interface communicates based on a SparkLink wireless communication protocol. Exemplarily, the SparkLink wireless communication technology includes a SparkLink Basic (SLB) and a SparkLink Low Energy (SLE).

[0020] The SparkLink wireless communication has characteristics of low latency, high reliability, high efficiency, and precise synchronization. For example, the one-way communication transmission latency in the SparkLink wireless communication is only in the order of microseconds (us), while the process of outputting a noise signal from a noise source to an ear in the vehicle noise reduction process takes milliseconds (ms). It can be seen that, in the vehicle noise reduction process, the SparkLink wireless communication applied in the cabin and / or outside the cabin can ensure that the latency of the secondary path in the noise reduction processing system provided in the application is less than the latency of the primary path, so that the noise cancellation signal output on the secondary path can reach the noise reduction position in time to cancel the noise signal, thereby obtaining a better noise reduction effect. In addition, the SparkLink wireless communication can realize one-to-many wireless communication connection, and the number of nodes connected by one node can reach hundreds or even thousands, and has advantages in transmission rate, reliability, latency, and security. When the SparkLink communication technology is applied in the vehicle noise reduction scene, the demand of connecting multiple terminals (for example, at least one of a loudspeaker, a microphone, and a noise collection sensor) by one noise reduction processing device can be met, and the transmission rate, reliability, and security can be improved.

[0021] In a possible implementation manner of the first aspect, the noise collection sensor is deployed outside the cabin of the vehicle, and the microphone, the loudspeaker, and the noise reduction processing device are deployed inside the cabin of the vehicle.

[0022] Implementing the above implementation manner, the cabin is equivalent to a closed space, and the electromagnetic environment in the cabin is relatively good, which provides convenience for wireless transmission of the noise feedback signal and the noise cancellation signal in the cabin.

[0023] In a possible implementation manner of the first aspect, the loudspeaker and / or the microphone are arranged at a seat in the vehicle.

[0024] It can be seen that the microphone and / or the loudspeaker can be arranged at the headrest of the seat, and are arranged around the driver and / or the passenger, so that the driver and / or the passenger is / are in the noise reduction area, and the noise around the ear can be effectively reduced, and the comfort of riding can be improved.

[0025] In a possible implementation manner of the first aspect, the loudspeaker is arranged adjacent to the microphone in the vehicle.

[0026] In the implementation manner, the noise cancellation signal is transmitted to the loudspeaker and played by the loudspeaker. Sometimes, the noise cancellation signal may not be sufficient to cancel the noise signal. In this case, the microphone is arranged adjacent to the loudspeaker, so that the microphone can collect the noise feedback signal at the loudspeaker in time and transmit the noise feedback signal to the noise reduction processing device to feedback adjust the noise cancellation signal, thereby facilitating fast noise reduction and optimizing the noise reduction effect.

[0027] In a possible implementation manner of the first aspect, when the microphone is in the noise collection mode, the microphone is configured to collect the noise feedback signal.

[0028] In an application scenario, it is assumed that the loudspeaker is a vehicle-mounted loudspeaker and the microphone is a vehicle-mounted microphone. It is assumed that the vehicle-mounted loudspeaker is playing music. The working mode of the vehicle-mounted microphone is set to the noise collection mode. In this case, the vehicle-mounted microphone collects the noise feedback signal in the cabin and sends the noise feedback signal to the noise reduction processing device. The noise reduction processing device generates the noise cancellation signal based on the noise feedback signal and the received noise signal and sends the noise cancellation signal to the vehicle-mounted loudspeaker. The vehicle-mounted loudspeaker plays the received noise cancellation signal while playing the music, thereby achieving in-vehicle noise reduction and making the in-vehicle music playing effect better and facilitating the improvement of the listening experience.

[0029] In another application scenario, it is assumed that the microphone is a vehicle-mounted microphone. A co-driver uses the microphone to sing K. In the noise reduction scenario, both working modes (i.e., the voice collection mode and the noise collection mode) of the vehicle-mounted microphone are checked, that is, the microphone can collect the noise feedback signal while collecting the voice signal and send the collected noise feedback signal to the noise reduction processing device, so that the noise reduction processing device can implement noise reduction based on the noise feedback signal, thereby improving the in-vehicle singing K experience.

[0030] In a possible implementation manner of the first aspect, the noise collection sensor includes at least one of a wind noise sensor, a road noise sensor, a tire noise sensor, and an engine noise sensor.

[0031] Exemplarily, the road noise sensor can be an accelerometer, and the engine noise sensor can be a speed sensor.

[0032] In the implementation manner, the noise cancellation signal is transmitted to the loudspeaker and played by the loudspeaker. Sometimes, the noise cancellation signal may not be sufficient to cancel the noise signal. In this case, the microphone is arranged adjacent to the loudspeaker, so that the microphone can collect the noise feedback signal at the loudspeaker in time and transmit the noise feedback signal to the noise reduction processing device to feedback adjust the noise cancellation signal, thereby facilitating fast noise reduction and optimizing the noise reduction effect.

[0033] In a possible implementation manner of the first aspect, the noise collection sensor is connected to the noise reduction processing device through a transmission line.

[0034] Here, the transmission line refers to a cable for transmitting electromagnetic energy, and can also be understood as a cable for transmitting electric energy and signals. The transmission line can be used to transmit alternating current and direct current, and the transmission line can be, for example, a coaxial radio frequency cable.

[0035] In the implementation manner, the noise collection sensor and the noise reduction processing device are connected to the same transmission line. The noise collection sensor can output a radio frequency signal carrying a noise signal to the transmission line, so that the noise reduction processing device acquires the noise signal from the transmission line through the first input interface. The noise signal is transmitted in a wired manner, which can ensure low-delay transmission and avoid environmental interference, and is conducive to improving the noise reduction effect. In addition, the transmission line can be used to supply power to the noise collection sensor.

[0036] In a possible implementation manner of the first aspect, the noise collection sensor includes a first noise collection sensor and a second noise collection sensor, and the first noise collection sensor and the second noise collection sensor are of different types. The noise collection sensor is connected to the noise reduction processing device through a transmission line, and the first noise collection sensor is connected to the noise reduction processing device through a first transmission line, and the second noise collection sensor is connected to the noise reduction processing device through a second transmission line.

[0037] In the implementation manner, different types of noise sensors are connected to the noise reduction processing device through different transmission lines, which can realize synchronous transmission of different types of noise signals and avoid mutual interference between different types of noise signals.

[0038] In a possible implementation manner of the first aspect, the microphone or the speaker is connected to the noise reduction processing device through a transmission line.

[0039] In the implementation manner, the microphone or the speaker and the noise reduction processing device are connected to the same transmission line, which is conducive to saving the wiring harness and reducing the deployment difficulty of the wiring harness in the vehicle. In addition, when the microphone is connected to the transmission line, the microphone outputs a radio frequency signal carrying a noise feedback signal to the transmission line, so that the noise reduction processing device acquires the noise feedback signal from the transmission line through the second input interface. Alternatively, when the speaker is connected to the transmission line, the noise reduction processing device can output a radio frequency signal carrying a noise cancellation signal to the transmission line through the first output interface, so that the speaker can acquire the noise cancellation signal based on the transmission line. The noise feedback signal or the noise cancellation signal is transmitted in a wired manner, which can ensure low-delay transmission and avoid environmental interference, and is conducive to improving the noise reduction effect. In addition, the transmission line can be used to supply power to the microphone or the speaker.

[0040] In a second aspect, the present application provides a noise reduction processing device, the device comprising a first input interface, a second input interface and a first output interface, wherein the first input interface is configured to receive a noise signal from a noise collection sensor; the second input interface is configured to receive a noise feedback signal from a microphone; and the first output interface is configured to send a noise cancellation signal to a speaker, the noise cancellation signal being generated based on the noise signal and the noise feedback signal; and wherein at least one of the second input interface and the first output interface is a wireless interface.

[0041] In the above method, the noise reduction processing device obtains the noise signal collected by the noise collection sensor through the first input interface, obtains the noise feedback signal collected by the microphone through the second input interface, generates the noise cancellation signal based on the noise signal and the noise feedback signal, and outputs the noise cancellation signal to the speaker through the first output interface to cancel the noise signal, thereby achieving noise reduction. Moreover, at least one of the second input interface and the first output interface is a wireless interface, which not only saves the consumption of wiring harness and reduces the difficulty of wiring harness deployment for noise reduction, but also realizes low-delay transmission of the signal, so that the noise cancellation signal output by the first output interface can reach the noise reduction position in time before the noise signal propagates through the air to the human ear, thereby canceling the noise signal and improving the noise reduction effect.

[0042] The beneficial effects of any of the technical features of the second aspect described below can refer to the description of the beneficial effects of the corresponding features of the first aspect described above, which will not be described here again.

[0043] In a possible implementation of the second aspect, at least one of the second input interface and the first output interface is a wireless interface, comprising:

[0044] Both the second input interface and the first output interface are wireless interfaces.

[0045] The second input interface is a wireless interface, and the first output interface is a wired interface; or

[0046] The second input interface is a wired interface, and the first output interface is a wireless interface.

[0047] In a possible implementation of the second aspect, the first input interface is a wired interface or a wireless interface.

[0048] In a possible implementation of the second aspect, the wireless interface communicates based on a star flash wireless communication protocol.

[0049] In a possible implementation of the second aspect, the noise collection sensor comprises at least one of a wind noise sensor, a road noise sensor, a tire noise sensor and an engine noise sensor.

[0050] In a possible implementation form of the second aspect, the loudspeaker and / or the microphone are arranged at a seat in the vehicle.

[0051] In a possible implementation form of the second aspect, the loudspeaker is arranged at a position in the vehicle adjacent to a position of the microphone in the vehicle.

[0052] In a third aspect, the application provides a vehicle comprising the noise reduction processing system according to the first aspect or any possible implementation form of the first aspect, or comprising the noise reduction processing apparatus according to the second aspect or any possible implementation form of the second aspect. BRIEF DESCRIPTION OF DRAWINGS

[0053] Figure 1 is a schematic diagram of a noise reduction processing system of a vehicle according to an embodiment of the application;

[0054] Figure 2A is a deployment schematic diagram of a noise reduction processing system according to an embodiment of the application;

[0055] Figure 2B is a deployment schematic diagram of a noise reduction processing system according to an embodiment of the application;

[0056] Figure 2C is a deployment schematic diagram of a noise reduction processing system according to an embodiment of the application;

[0057] Figure 2D is a deployment schematic diagram of a noise reduction processing system according to an embodiment of the application;

[0058] Figure 2E is a deployment schematic diagram of a noise reduction processing system according to an embodiment of the application;

[0059] Figure 3 is a circuit schematic diagram of a current shunt device according to an embodiment of the application;

[0060] Figure 4 is a circuit schematic diagram of a current shunt device according to an embodiment of the application;

[0061] Figure 5A is a circuit topology schematic diagram of a vehicle noise reduction processing system according to an embodiment of the application;

[0062] Figure 5B is a circuit connection schematic diagram of a noise collection node and a noise reduction processing node according to an embodiment of the application;

[0063] Figure 6A is a circuit connection schematic diagram of a loudspeaker and a noise reduction processing node according to an embodiment of the application;

[0064] Figure 6B is another circuit connection schematic diagram of a speaker and a noise reduction processing node provided by an embodiment of the present application;

[0065] Figure 7 is a circuit connection schematic diagram of a microphone and a noise reduction processing node provided by an embodiment of the present application;

[0066] Figure 8A is a circuit connection schematic diagram of a noise collection node and a noise reduction processing node provided by an embodiment of the present application;

[0067] Figure 8B is another circuit connection schematic diagram of a noise collection node and a noise reduction processing node provided by an embodiment of the present application;

[0068] Figure 9A is a circuit connection schematic diagram of a noise collection node and a noise reduction processing node provided by an embodiment of the present application;

[0069] Figure 9B is a circuit connection schematic diagram of a noise collection node and a noise reduction processing node provided by an embodiment of the present application. DETAILED DESCRIPTION

[0070] It should be noted that the prefix words such as "first", "second" in the present application are only used to distinguish different description objects, and have no limitation on the position, order, priority, quantity or content of the described objects. For example, the described objects are "fields", and the ordinal numbers before "fields" in "first field" and "second field" do not limit the position or order between "fields", and "first" and "second" do not limit whether the "fields" modified by them are in the same message or not, nor the order of "first field" and "second field". For another example, the described objects are "levels", and the ordinal numbers before "levels" in "first level" and "second level" do not limit the priority between "levels". For another example, the quantity of the described objects is not limited by the prefix words, which can be one or more. In addition, the objects modified by different prefix words can be the same or different, for example, the described objects are "devices", and "first device" and "second device" can be the same device, the same type of device or different types of devices; for another example, the described objects are "information", and "first information" and "second information" can be information of the same content or information of different content. In summary, the use of prefix words for distinguishing description objects in the embodiments of the present application does not constitute a limitation on the described objects, and the statements on the described objects should refer to the description in the claims or embodiments, and should not constitute an unnecessary limitation because of the use of such prefix words.

[0071] It should be noted that the description such as "at least one of a1, a2, …, and an (or at least one)" in the embodiments of the present application includes any one of a1, a2, …, and an alone, and also includes any combination of any number of a1, a2, …, and an, and each case can exist alone. For example, the description of "at least one of a, b, and c" includes the cases of a alone, b alone, c alone, a and b in combination, a and c in combination, b and c in combination, or a, b, and c in combination.

[0072] The technical solutions in the present application will be described below with reference to the drawings.

[0073] Referring to Figure 1 , Figure 1 is a schematic diagram of a noise reduction processing system of a vehicle provided by an embodiment of the present application. In Figure 1 , the noise reduction processing system includes a noise collection sensor, a speaker, a microphone, and a noise reduction processing device. Exemplarily, the noise collection sensor is disposed outside a cabin of the vehicle, and the speaker, the microphone, and the noise reduction processing device are disposed inside the cabin of the vehicle.

[0074] Here, the microphone can also be referred to as an error microphone. The microphone can be, for example, an original microphone or a vehicle-mounted microphone on the vehicle, or a special microphone deployed for noise reduction, or a microphone temporarily accessed by a user. The microphone has two working modes, one of which is a voice collection mode, i.e., a traditional mode, for example, for collecting human voice, and the other of which is a noise collection mode, which can be applied to the noise reduction scene of the present application, for collecting a noise feedback signal. Exemplarily, in the noise reduction scene, the working mode of the microphone can be selected as the noise collection mode, or both working modes of the microphone can be selected at the same time.

[0075] In Figure 1 , the noise collection sensor is configured to collect a noise signal and send the noise signal to a first input interface of the noise reduction processing device, the microphone is configured to collect a noise feedback signal and send the noise feedback signal to a second input interface of the noise reduction processing device, and the noise reduction processing device is configured to generate a noise cancellation signal based on the received noise signal and the noise feedback signal, and send the noise cancellation signal to the speaker through a first output interface. At least one of the second input interface and the first output interface is a wireless interface.

[0076] In an implementation manner, at least one of the second input interface and the first output interface is a wireless interface, including:

[0077] The second input interface and the first output interface are both wireless interfaces;

[0078] The second input interface is a wireless interface, and the first output interface is a wired interface; or,

[0079] The second input interface is a wired interface, and the first output interface is a wireless interface.

[0080] For example, the second input interface is a wireless interface, and the first output interface is a wired interface. It can be understood that the second input interface is a wireless interface, which means that the noise feedback signal is transmitted through wireless communication; the first output interface is a wired interface, which means that the noise cancellation signal is transmitted through wired communication.

[0081] As a possible implementation, the wireless interface communicates based on a SparkLink wireless communication protocol.

[0082] Exemplarily, the first input interface is a wired interface or a wireless interface. In some possible embodiments, in the case where the number of noise collection sensors is multiple, a part of noise signals collected by some noise collection sensors can be transmitted through wired transmission, and another part of noise signals collected by some noise collection sensors can be transmitted through wireless transmission. Therefore, the first input interface includes both types of interfaces, i.e., a wired interface and a wireless interface.

[0083] For example, the first input interface of the noise reduction processing apparatus includes a wired interface 1 and a wireless interface 1, and the noise signal includes a first noise signal and a second noise signal. It is assumed that the first noise signal is collected by a noise collection sensor 1, and the second noise signal is collected by a noise collection sensor 2. The noise collection sensor 1 transmits the first noise signal to the wired interface 1 of the noise reduction processing apparatus, and the noise collection sensor 2 transmits the second noise signal to the wireless interface 1 of the noise reduction processing apparatus.

[0084] Exemplarily, the noise collection sensor includes at least one of a wind noise sensor, a road noise sensor, a tire noise sensor, an engine noise sensor, and the like. The engine noise sensor can be a speed sensor, and the road noise sensor can be an accelerometer.

[0085] It can be understood that the path from the noise source (i.e., the noise signal) to the human ear can be referred to as a primary path, and the path from the noise source to the loudspeaker through the noise reduction processing apparatus can be referred to as a secondary path. In order to achieve noise reduction, the time delay of the secondary path is less than that of the primary path.

[0086] In the embodiments of the present application, considering the communication between the noise collection sensor outside the vehicle, the loudspeaker, the microphone, and the noise reduction processing apparatus inside the vehicle, the transmission modes of the above-mentioned noise signal, noise cancellation signal, and noise feedback signal are as follows: the noise signal is transmitted through at least one of wired communication and wireless communication, and at least one of the noise cancellation signal and the noise feedback signal is transmitted through wireless communication. Specifically, the following multiple cases are included:

[0087] Case 1: the noise signal is transmitted through wired communication, and the noise feedback signal and the noise cancellation signal are both transmitted through wireless communication. Correspondingly, for the noise reduction processing device, the first input interface is a wired interface, and the second input interface and the first output interface are both wireless interfaces.

[0088] Referring to Figure 2A , Figure 2A is a deployment schematic diagram of a noise reduction processing system provided by an embodiment of the present application. In Figure 2A , it can be seen that the noise collection sensors deployed outside the vehicle include multiple wind noise sensors, multiple road noise sensors, multiple tire noise sensors, and multiple engine noise sensors, and the noise reduction processing device, multiple microphones (hereinafter referred to as a microphone group) and multiple loudspeakers (hereinafter referred to as a loudspeaker group) are deployed inside the vehicle.

[0089] In Figure 2A , the noise collection sensors outside the vehicle are all wired to the noise reduction processing device, wherein different types of noise collection sensors can be connected to the noise reduction processing device through different transmission lines, and noise collection sensors of the same type can be connected to the noise reduction processing device through the same transmission line. For example Figure 2A , the wind noise sensors 1, …, wind noise sensor n are connected to the noise reduction processing device through the transmission line 1, the tire noise sensors 1, …, tire noise sensor n are connected to the noise reduction processing device through the transmission line 2, and the transmission line 1 is different from the transmission line 2. In some possible embodiments, different types of noise collection sensors can also be connected to the noise reduction processing device based on the same transmission line, which is not specifically limited here.

[0090] Here, the transmission line refers to a cable for transmitting electromagnetic energy, and can also be understood as a cable for transmitting electrical energy and signals. The transmission line can be used to transmit alternating current and direct current, and the transmission line can be, for example, a coaxial radio frequency cable.

[0091] Figure 2A In , each microphone is configured with a wireless transceiver, each loudspeaker is configured with a wireless transceiver, and the noise reduction processing device is also configured with a wireless transceiver, so that the microphone and the noise reduction processing device, and the loudspeaker and the noise reduction processing device can communicate wirelessly.

[0092] Exemplarily, the wireless transceiver can be an antenna, an antenna transmitter, a radio transmitter, etc.

[0093] Figure 2A In Figure 2A , the arrows represent the flow direction of the signals. As shown inIt can be seen that the noise signal is transmitted to the noise reduction processing device through wired communication, each microphone in the microphone group collects the noise feedback signal and transmits the noise feedback signal through the wireless transceiver connected thereto, and the noise reduction processing device transmits the noise cancellation signal through the wireless transceiver connected thereto.

[0094] Exemplarily, the microphone and / or the loudspeaker can be arranged at a seat in the vehicle, for example, a seat including but not limited to a seat of a driver's position, a seat of a co-driver's position, a seat of a passenger, etc. Figure 2A In the embodiment, it can be seen that the microphone and the loudspeaker are arranged near the headrest of the seat. In some possible embodiments, the microphone and / or the loudspeaker can also be arranged near a steering wheel, a central console or a roof lamp panel in the vehicle.

[0095] Exemplarily, the position of the loudspeaker in the vehicle can be adjacent to the position of the microphone in the vehicle.

[0096] In an application scenario, the microphone is a vehicle microphone, and in Figure 2A the microphone is a wireless microphone, assuming that a co-driver sings K using the wireless microphone, in the noise reduction scenario, both working modes (i.e., the voice collection mode and the noise collection mode) of the wireless microphone are checked, that is, the microphone can collect the noise feedback signal while collecting the voice signal, and the collected noise feedback signal is sent to the noise reduction processing device, so that the noise reduction processing device implements noise reduction based on the noise feedback signal, thereby improving the singing K experience in the vehicle. In some possible embodiments, the microphone can also be deployed in another way, which is not limited here.

[0097] In another application scenario, the loudspeaker is a vehicle loudspeaker, assuming that the vehicle loudspeaker is playing music, the working mode of the vehicle microphone is set to the noise collection mode, in this case, the vehicle microphone collects the noise feedback signal in the cabin and sends the noise feedback signal to the noise reduction processing device, the noise reduction processing device generates the noise cancellation signal based on the noise feedback signal and the received noise signal, and sends the noise cancellation signal to the vehicle loudspeaker, the vehicle loudspeaker plays the received noise cancellation signal while playing the music, thereby implementing noise reduction in the vehicle and making the music playing effect in the vehicle better and improving the listening experience.

[0098] Case 2: The noise signal is transmitted through wired communication, the noise feedback signal is transmitted through wireless communication, and the noise cancellation signal is transmitted through wired communication. Correspondingly, for the noise reduction processing device, the first input interface is a wired interface, the second input interface is a wireless interface, and the first output interface is a wired interface.

[0099] Figure 2B is another deployment schematic diagram of a noise reduction processing system provided by the embodiment of the application. Figure 2BCompared with Figure 2A The difference is that Figure 2B The noise cancellation signal is transmitted through wired communication in the case, so the first output interface of the noise reduction processing device is a wired interface. Figure 2B The remaining part of the description can refer to the description of the corresponding content in Figure 2A .

[0100] Exemplarily, each speaker can be connected to the noise reduction processing device through the same transmission line, or can be connected to the noise reduction processing device through different transmission lines respectively. The specific circuit connection form can refer to the related description of the circuit topology of the following system, and will not be described here.

[0101] Case 3: The noise signal is transmitted through wired communication, the noise feedback signal is transmitted through wired communication, and the noise cancellation signal is transmitted through wireless communication. Correspondingly, for the noise reduction processing device, the first input interface is a wired interface, the second input interface is a wired interface, and the first output interface is a wireless interface.

[0102] Figure 2C is another deployment schematic diagram of a noise reduction processing system provided by an embodiment of the present application. Figure 2C Compared with Figure 2A The difference is that Figure 2C The noise feedback signal is transmitted through wired communication in the case, so the second input interface of the noise reduction processing device is a wired interface. Figure 2C The remaining part of the description can refer to the description of the corresponding content in Figure 2A .

[0103] Exemplarily, each microphone can be connected to the noise reduction processing device through the same transmission line, or can be connected to the noise reduction processing device through different transmission lines respectively, which is not limited here.

[0104] Case 4: The noise signal, the noise feedback signal and the noise cancellation signal are all transmitted through wireless transmission. Correspondingly, for the noise reduction processing device, the first input interface, the second input interface and the first output interface are all wireless interfaces.

[0105] Figure 2D is another deployment schematic diagram of a noise reduction processing system provided by an embodiment of the present application. Figure 2D Compared with Figure 2A The difference is that Figure 2D The noise signal is transmitted through wireless communication in the case, so the first input interface of the noise reduction processing device is a wireless interface. Figure 2D The remaining part of the description can refer to the description of the corresponding content in Figure 2A .

[0106] Case 5: The noise signal is transmitted via both wired and wireless communication, and both the noise feedback signal and the noise cancellation signal are transmitted via wireless communication. Accordingly, for the noise reduction processing device, the first input interface includes a wired interface and a wireless interface, and both the second input interface and the first output interface are wireless interfaces.

[0107] Figure 2E This is a deployment diagram of another noise reduction processing system provided in the embodiments of this application. Figure 2E Compared to Figure 2A The difference is Figure 2E One part of the noise signal is transmitted through wired communication, and the other part of the noise signal is transmitted through wireless communication. Therefore, the first input interface of the noise reduction processing device includes both a wired interface and a wireless interface.

[0108] For example, some noise acquisition sensors outside the vehicle are wired to the noise reduction processing device via a transmission line, while other noise acquisition sensors are wirelessly connected to the noise reduction processing device via a wireless transceiver. Figure 2E In the process, the noise signals collected by the wind noise sensor and the road noise sensor are transmitted to the noise reduction processing device via wireless communication, while the noise signals collected by the tire noise sensor and the engine noise sensor are transmitted to the noise reduction processing device via their respective connected transmission lines. Figure 2E The remaining description can be found in [the original text]. Figure 2A The corresponding content is described in the text.

[0109] Understandable. Figure 2E The noise reduction system deployment shown is merely an example and does not limit the communication between wind noise sensors and road noise sensors and the noise reduction device to wireless communication, nor does it limit the communication between tire noise sensors and engine noise sensors and the noise reduction device to wired communication. It is sufficient that some of the noise acquisition sensors deployed outside the vehicle communicate wirelessly with the noise reduction device, while others communicate wiredly.

[0110] Case 6: Noise signals are transmitted via wired and wireless communication, noise feedback signals are transmitted via wired communication, and noise cancellation signals are transmitted via wireless communication.

[0111] In this case, the deployment of external noise acquisition sensors can refer to the above. Figure 2E For the deployment of noise acquisition sensors and loudspeakers, please refer to [reference needed]. Figure 2A For the deployment of the central speaker and microphone, please refer to [reference needed]. Figure 2C The deployment of the microphone will not be elaborated here.

[0112] Case 7: Noise signals are transmitted via wired and wireless communication, noise feedback signals are transmitted via wireless communication, and noise cancellation signals are transmitted via wired communication.

[0113] In this case, the deployment of the noise collection sensors outside the vehicle can refer to the deployment of the noise collection sensors in the above Figure 2E , the deployment of the loudspeakers can refer to the deployment of the loudspeakers in the above Figure 2B , the deployment of the microphones can refer to the deployment of the microphones in the above Figure 2A , and details are not repeated here.

[0114] Case 8: The noise signal is transmitted through wireless communication, and at least one of the noise feedback signal and the noise cancellation signal is transmitted through wireless communication.

[0115] In this case, the deployment of the noise collection sensors outside the vehicle can refer to the deployment of the noise collection sensors in the above Figure 2D , the deployment of the microphones and the loudspeakers can refer to the deployment of the microphones and the loudspeakers in the above Figure 2A , the deployment of the microphones and the loudspeakers in the above Figure 2B , the deployment of the microphones and the loudspeakers in the above Figure 2C , and details are not repeated here.

[0116] As a possible implementation, the above wireless communication can be starlink wireless communication, such as starlink wireless short-range communication. Starlink wireless communication has the characteristics of low latency, high reliability, high efficiency, precise synchronization, etc. In the process of vehicle noise reduction, applying starlink wireless communication in the cabin and / or outside the cabin can ensure that the latency of the above secondary path is less than the latency of the primary path, so as to achieve noise reduction.

[0117] In a starlink communication system, multiple nodes are usually included, and one node can access multiple other nodes to jointly complete the communication function. Taking the above Figure 2D as an example, the noise reduction processing device can be regarded as a node in the starlink communication system, each noise collection sensor outside the vehicle can be regarded as a node in the starlink communication system, each microphone inside the vehicle can be regarded as a node in the starlink communication system, and each loudspeaker can also be regarded as a node in the starlink communication system. The node of the noise reduction processing device can be connected to multiple nodes (i.e. noise collection sensors) outside the vehicle and multiple nodes (i.e. microphones and loudspeakers) inside the vehicle. Starlink communication technology can realize one-to-many wireless communication connection, and the number of nodes connected by one node can reach hundreds or even thousands, and has advantages in transmission rate, reliability, latency and security. When starlink communication technology is applied in the vehicle noise reduction scene, it can meet the demand of one noise reduction processing device connecting multiple terminals (for example, at least one of the loudspeakers, microphones, noise collection sensors, etc.), and can improve the transmission rate, reliability and security.

[0118] In some possible embodiments, the wireless communication described above can also be other vehicle-mounted short-range wireless communication technologies that meet low-delay transmission requirements, which are not limited herein.

[0119] It should be noted that, Figures 2A-2E is only an exemplary architecture diagram, but does not limit Figures 2A-2E the number of network elements included in the system. Although Figures 2A-2E is not shown, in addition to Figures 2A-2E the functional entities shown, Figures 2A-2E other functional entities can also be included. In addition, the method provided in the embodiments of the present application can be applied to Figures 2A-2E the communication system shown, and of course the method provided in the embodiments of the present application can also be applicable to other communication systems, which are not limited by the embodiments of the present application.

[0120] It can be seen that, in the noise reduction process in the vehicle, since the vehicle cabin is equivalent to a closed space, at least one of the noise feedback signal and the noise cancellation signal is transmitted through wireless communication in the process of noise reduction in the vehicle, which not only helps to improve the communication performance and reliability, but also saves the wire harness and reduces the wiring difficulty of the wire harness in the vehicle. The noise signal collected by the noise collection node outside the vehicle is transmitted through wired communication, which can improve the reliability of communication and reduce the occupation of spectrum resources. The noise signal collected by the noise collection node outside the vehicle is transmitted through wireless communication, which can save the wire harness while ensuring low latency.

[0121] The implementation of the above Figures 2A-2E will be described below in combination with a specific circuit topology.

[0122] Before introducing the circuit structure, in the embodiments of the present application, the directions of various devices in the circuit are defined first. For the devices such as resistors, AC isolators, DC isolators, etc. in the circuit, if the connection direction of the two ends thereof is up-down connection, the end located on the upper side of the device is referred to as the first end of the device, and the end located on the lower side of the device is referred to as the second end of the device; if the connection direction of the two ends thereof is left-right connection, the end located on the left side of the device is referred to as the first end of the device, and the end located on the right side of the device is referred to as the second end of the device.

[0123] In the embodiments of the present application, when the plurality of noise collection sensors, or the plurality of microphones, or the plurality of speakers are connected to the noise reduction processing device through wired connection, in order to save the length of the wire harness to be deployed, the connection can be realized through a transmission line, which can be a bus for example. In order to enable as many nodes (such as noise collection sensors or microphones or speakers) as possible to be connected to the transmission line to further save the length of the wire harness, the non-first node and the non-last node on the transmission line can be connected to the transmission line through a current shunt device for example.

[0124] Referring to Figure 3 , Figure 3is a circuit schematic diagram of a current shunt device provided by an embodiment of the present application. In Figure 3 the current shunt device comprises a resistor R1, a resistor R2, an AC block ACBlock1, an AC block ACBlock2 and a shunt unit, wherein a second end of R2 is configured to output current, a first end of R1 is configured to input current, a second end of R1 is connected to a first end of R2, R1 is connected in parallel with ACBlock1, R2 is connected in parallel with ACBlock2, a first end of the shunt unit is connected to the second end of R1, a second end of the shunt unit is configured to output DC, and a third end of the shunt unit is configured to input and / or output AC, wherein the DC carries a power signal, and the AC carries a noise signal.

[0125] Exemplarily, when the third end of the shunt unit is connected to a noise collection sensor, the third end of the shunt unit is configured to output AC to a transmission line where R1 and R2 are located, and the AC carries a noise signal collected by the noise collection sensor.

[0126] Exemplarily, when the third end of the shunt unit is connected to a speaker, the third end of the shunt unit is configured to input AC to the speaker, and the AC carries a noise cancellation signal.

[0127] Exemplarily, when the third end of the shunt unit is connected to a microphone, the third end of the shunt unit is configured to output AC to a transmission line where R1 and R2 are located, and the AC carries a noise feedback signal.

[0128] Specifically, in Figure 3 the shunt unit comprises an AC block ACBlock3 and a DC block DCBlock1, wherein a first end of ACBlock3 and a first end of DCBlock1 are respectively connected to the second end of R1, a second end of ACBlock3 is the second end of the shunt unit, and a second end of DCBlock1 is the third end of the shunt unit.

[0129] Further, in Figure 3 the shunt unit further comprises a resistor R3, wherein the second end of DCBlock1 is grounded through R3, and the resistance value of R3 is greater than the resistance value of R1.

[0130] Here, the AC block refers to a component that can conduct DC current while blocking the transmission of AC current. Exemplarily, the AC block can be an inductor, a magnetic bead or the like. The DC block refers to a component that can conduct AC current while blocking DC current. Exemplarily, the DC block can be a capacitor, a diode or the like.

[0131] Optionally, in Figure 3In the DCBlock1, the capacitor can be connected in series with the resistor R4, or the resistor R4 is set independently from the DCBlock1 and connected in series with the DCBlock1. In this case, the resistance of the resistor R4 is greater than the resistance of the resistor R1 and less than the resistance of the resistor R3. Exemplarily, in the DCBlock1, the capacitor is connected in series with the resistor R4, and the resistor R4 is located below the capacitor.

[0132] It can be understood that the transmission of the radio frequency signal in the current shunt device satisfies the following two conditions: (1) the loss of the radio frequency signal when transmitted between the first end of the R1 and the third end of the shunt unit is equal to the loss of the radio frequency signal when transmitted between the second end of the R2 and the third end of the shunt unit; (2) the loss of the radio frequency signal when transmitted between the first end of the R1 and the second end of the R2 is less than the loss of the radio frequency signal when transmitted between the first end of the R1 and the third end of the shunt unit. Similarly, the loss of the radio frequency signal when transmitted between the first end of the R1 and the second end of the R2 is also less than the loss of the radio frequency signal when transmitted between the second end of the R2 and the third end of the shunt unit.

[0133] In some possible embodiments, the shunt unit can also be designed as Figure 4 shown. In Figure 4 , the shunt unit includes an alternating current breaker ACBlock3, an alternating current breaker ACBlock4, a resistor R3, and a direct current breaker DCBlock1. The ACBlock4 is connected in parallel with the R3. The first end of the R3 is connected with the second end of the R1. The second end of the R3 is connected with the first end of the ACBlock3 and the first end of the DCBlock1, respectively. The second end of the ACBlock4 is the second end of the shunt unit. The second end of the DCBlock1 is the third end of the shunt unit. The resistance of the R3 is greater than the resistance of the R1.

[0134] Further, in Figure 4 , the shunt unit further includes a direct current breaker DCBlock2 and a resistor R4. The DCBlock2 and the R4 form a series circuit. The first end of the DCBlock1 is connected with the first end of the series circuit. The second end of the series circuit is grounded. The resistance of the R4 is greater than the resistance of the R3.

[0135] The circuit topology of the noise reduction processing system is introduced below.

[0136] Referring to Figure 5A , Figure 5A , the circuit topology of the noise reduction processing system provided by the embodiments of the present application is shown. Figure 5A The deployment of the noise reduction processing system shown in Figure 2A can be implemented. In Figure 5AIn the embodiment, the noise signal is transmitted through wired communication, and the noise cancellation signal and the noise feedback signal are transmitted through wireless communication.

[0137] In the embodiment, the noise signal is transmitted through wired communication, and the noise cancellation signal and the noise feedback signal are transmitted through wireless communication. Figure 5A In the embodiment, the noise signal is transmitted through wired communication, and the noise cancellation signal and the noise feedback signal are transmitted through wireless communication.

[0138] In the embodiment, the noise signal is transmitted through wired communication, and the noise cancellation signal and the noise feedback signal are transmitted through wireless communication. Figure 5A In the embodiment, the noise signal is transmitted through wired communication, and the noise cancellation signal and the noise feedback signal are transmitted through wireless communication.

[0139] Further, the first part includes a power divider or a switch element, a DC Block and an AC Block, the first end of the first part is the first end of the AC Block, the second end of the AC Block is the third end of the first part, the fourth end of the first part is the first end of the power divider or the first end of the switch element, the second end of the power divider or the second end of the switch element is connected with the wireless transceiver, the third end of the power divider or the third end of the switch element is connected with the second end of the DC Block, and the first end of the DC Block is the second end of the first part.

[0140] In the embodiment, the noise signal is transmitted through wired communication, and the noise cancellation signal and the noise feedback signal are transmitted through wireless communication.

[0141] In some possible embodiments, the first part further comprises a wireless transceiver device.

[0142] Exemplarily, the second part comprises a power management unit, a radio frequency unit, a baseband processing unit and a noise reduction processor, wherein a first end of the power management unit is the first end of the second part, a second end of the power management unit is the third end of the second part, a first end of the radio frequency unit is the second end of the second part, a second end of the radio frequency unit is connected to a first end of the baseband processing unit, a second end of the baseband processing unit is connected to the noise reduction processor, and a third end of the baseband processing unit is connected to the third end of the power management unit.

[0143] Herein, Figure 5A The second part is configured with signal coding and decoding, and channel coding and decoding support the second part to perform wireless communication, or wireless communication and wired communication. Exemplarily, the baseband processing unit is configured with channel coding and decoding. The radio frequency unit is used for conversion of radio frequency signals. For example, the radio frequency unit converts received radio frequency signals from a higher frequency band to a lower frequency band for further processing by the baseband processing unit, and converts radio frequency signals output by the baseband processing unit from a lower frequency band to a higher frequency band and outputs them externally. In Figure 5A The radio frequency unit can output radio frequency signals through a wireless transceiver device connected thereto or through a cable (or transmission line) connected thereto. The functions of the baseband processing unit include, but are not limited to, modulation and demodulation of baseband signals, channel equalization, channel coding and decoding, scrambling and descrambling, data checking, etc.

[0144] Exemplarily, the noise reduction processor can be an audio power amplifier unit.

[0145] In Figure 5A , the plurality of noise collection nodes comprise noise collection node 1, …, noise collection node n. It can be seen that noise collection node n is the last node on the first transmission line, and noise collection nodes 1, …, noise collection node n-1 are intermediate nodes connected to the first transmission line.

[0146] On the transmission line, the first node (for example, the noise reduction processing node in Figure 5A ) and the last node (for example, the noise collection node n in Figure 5A ) do not need to consider the forward or backward transmission of signals, so the first node and the last node can be directly connected to the transmission line. For example, in Figure 3In the diagram, the noise acquisition node n includes an AC block, a DC block, a resistor (which can be omitted), and a noise acquisition device n (shown in a dashed box). The AC block is used to input the DC current from the current on the first transmission line to the noise acquisition device n, and the DC block is used to output the AC current from the current from the noise acquisition device n to the first transmission line. This AC current carries the noise signal acquired by the noise acquisition device n.

[0147] Intermediate nodes on the transmission line, needing to consider both forward and backward signal transmission, must use the aforementioned... Figure 4 or Figure 5A The current shunt device shown is connected to the transmission line, for example, by Figure 3 Taking noise acquisition node 1 as an example, noise acquisition node 1 includes a current shunt device 1. The specific circuit structure of the current shunt device 1 can be found in [reference needed]. Figure 5A The description of the current shunt device shown will not be repeated here. The circuit structure of the other noise acquisition nodes that serve as intermediate nodes on the first transmission line is the same as that of noise acquisition node 1, and will not be repeated here.

[0148] In one implementation, Figure 2A In the diagram, noise acquisition nodes 1, ..., n include... Figure 2A The noise sensor shown outside the vehicle illustrates... Figure 5A The noise acquisition sensors outside the vehicle shown are connected to the noise reduction processing device through the same transmission line, namely the first transmission line.

[0149] In another implementation, Figure 2A In the diagram, noise acquisition node 1, ..., noise acquisition node n are... Figure 2A The image shows a type of noise sensor located outside the vehicle, such as an engine noise sensor. In this case, Figure 5A Other types of noise acquisition sensors can be connected to the noise reduction processing device through other transmission lines, and different types of noise acquisition sensors are connected to the noise reduction processing device through different transmission lines.

[0150] The following is a detailed explanation. Figure 5A Transmission of various signals in noise reduction processing:

[0151] Method 1: In the noise reduction processing node, the device connected to the wireless transceiver is a switching element.

[0152] For example, the noise signals collected by each noise acquisition node are transmitted along the first transmission line. In this case, the first terminal of the control switching element is connected to the second terminal of the switching element, making the wireless transceiver currently unavailable, and the noise signals pass sequentially along the first transmission line. Figure 5AThe DC block and switching element within the first part are input to the second part (e.g., the noise reduction processor within the second part), thus enabling wired communication transmission of the noise signal. Furthermore, when the first and third terminals of the control switching element are connected, the wireless transceiver is now available, and the noise reduction processing node is disconnected from the first transmission line. Each microphone can then emit radio frequency signal 1 via its connected wireless transceiver. Radio frequency signal 1 carries the noise feedback signal. The noise reduction processing node receives radio frequency signal 1 via its own wireless transceiver. Radio frequency signal 1 is sequentially input to the second part through the second and first terminals of the switching element, thus enabling wireless communication transmission of the noise feedback signal. Further, the noise reduction processing node emits radio frequency signal 2 via its own wireless transceiver. Radio frequency signal 2 carries a noise cancellation signal, which is generated based on the noise signal and the noise feedback signal. Each speaker can receive radio frequency signal 2 via its connected wireless transceiver, thus enabling wireless communication transmission of the noise cancellation signal.

[0153] Method 2: In the noise reduction processing node, the device connected to the wireless transceiver is a power divider.

[0154] For example, the noise signals collected by each noise acquisition node are transmitted along the first transmission line and sequentially pass through... Figure 5A The DC block and switching elements within the first part are input to the second part (e.g., the noise reduction processor within the second part), thus achieving wired communication transmission of the noise signal. Additionally, each microphone can emit radio frequency signal 1 via its connected wireless transceiver. Radio frequency signal 1 carries the noise feedback signal. The noise reduction processing node receives radio frequency signal 1 via its own wireless transceiver. Radio frequency signal 1 is sequentially input to the second part through the second and first terminals of the power divider, thus achieving wireless communication transmission of the noise feedback signal. Furthermore, the noise reduction processing node emits radio frequency signal 2 via its own wireless transceiver. Radio frequency signal 2 carries the noise cancellation signal. Each speaker can receive radio frequency signal 2 via its connected wireless transceiver, thus achieving wireless communication transmission of the noise cancellation signal.

[0155] exist Figure 5A In the noise reduction processing node, the second part of the channel encoding and decoding configuration supports both wired and wireless communication. This allows the noise reduction processing unit to reuse not only its own baseband processing unit but also its own radio frequency unit when it uses wired communication to acquire noise signals, wireless communication to acquire noise feedback signals, and wireless communication to send noise cancellation signals. This eliminates the need to add additional processing units, which helps reduce the deployment cost of the network and achieves deep integration of wired and wireless communication in noise reduction scenarios, thus improving communication performance.

[0156] In some possible embodiments, Figure 5B The connection between multiple noise acquisition nodes and noise reduction processing nodes can also be replaced with Figure 2A The form shown can also achieve this. Figure 5B The deployment of the noise reduction processing system is shown. Figure 5B This is a schematic diagram of the circuit connection between a noise acquisition node and a noise reduction processing node provided in an embodiment of this application. Figure 5A Compared to Figure 5B The connection between the noise acquisition node and the noise reduction processing node is different in that... Figure 5B In this process, the noise reduction processing node does not include the power divider (or switching element) and the wireless transceiver. Instead, the wireless transceiver is used as the end node on the first transmission line. Correspondingly, noise acquisition node 1, ..., noise acquisition node n are all used as intermediate nodes on the first transmission line.

[0157] exist Figure 5B In the process, the noise signals collected by each noise acquisition node are transmitted along the first transmission line and sequentially pass through... Figure 3 The DC Block in the first part is input to the second part, thus realizing wired communication transmission of the noise signal. For the transmission of the noise feedback signal, each microphone can emit radio frequency signal 1 through its connected wireless transceiver. Radio frequency signal 1 carries the noise feedback signal. The wireless transceiver on the first transmission line receives radio frequency signal 1, and radio frequency signal 1 is transmitted along the first transmission line to the noise reduction processing node, thus realizing wireless communication transmission of the noise feedback signal. For the transmission of the noise cancellation signal, the noise reduction processing node generates radio frequency signal 2, which carries the noise cancellation signal. Radio frequency signal 2 is transmitted along the first transmission line to the wireless transceiver, which emits radio frequency signal 2. Each speaker can receive radio frequency signal 2 through its connected wireless transceiver, thus realizing wireless communication transmission of the noise cancellation signal.

[0158] Furthermore, it is not limited to Figure 3 The wireless transceiver in the first transmission line can only serve as the end node. In some possible embodiments, the wireless transceiver can also serve as an intermediate node on the first transmission line. In this case, the wireless transceiver also needs to be connected to the first transmission line through a current splitter, for example, by... Figure 5A The current splitter shown is slightly modified by removing the branch containing AC Block 3. This allows it to function as a current splitter for connecting a wireless transceiver. Figure 6A The second end of DC Block 1 is connected.

[0159] In some possible embodiments, of the noise cancellation signal and the noise feedback signal, only the noise cancellation signal may be transmitted via wired communication. In this case,Figure 2B The circuit structure corresponding to the loudspeaker group is replaced by Figure 6A the circuit structure shown in FIG. 4, so that the noise reduction processing system shown in FIG. 4 can be implemented. Figure 6A The deployment of the noise reduction processing system shown in FIG. 4 is that the noise signal is transmitted through wired communication, the noise cancellation signal is transmitted through wired communication, and the noise feedback signal is transmitted through wireless communication.

[0160] Figure 6A is a circuit connection schematic diagram of a loudspeaker and a noise reduction processing node provided by an embodiment of the present application. In Figure 6B , the loudspeaker group includes loudspeaker 1, …, loudspeaker m2, m2 is a positive integer, and the loudspeaker group is connected to the noise reduction processing node through other transmission lines, which are different from the first transmission line. Exemplarily, different loudspeakers are connected to the noise reduction processing node through different transmission lines, for example, the other transmission lines include transmission line 1, …, transmission line m2, wherein loudspeaker 1 is connected to the noise reduction processing node based on transmission line 1, …, and loudspeaker m2 is connected to the noise reduction processing node based on transmission line m2.

[0161] In Figure 6B , the noise cancellation signal is transmitted through wired communication, specifically: the noise reduction processing node generates a radio frequency signal, the radio frequency signal carries the noise cancellation signal, the radio frequency signal is transmitted to the other transmission lines by the first transmission line, and is transmitted to each loudspeaker along the other transmission lines.

[0162] Optionally, when the noise cancellation signal is transmitted through wired communication, in order to save the length of the wire harness, different loudspeakers in the loudspeaker group can also be connected to the noise reduction processing node through the same transmission line, for example Figure 6B the second transmission line in Figure 6B . is another circuit connection schematic diagram of a loudspeaker and a noise reduction processing node provided by an embodiment of the present application. In Figure 5A , each loudspeaker is connected to the noise reduction processing node based on the second transmission line, wherein the second transmission line is different from the first transmission line. Loudspeaker 1, …, loudspeaker m2-1 can be regarded as intermediate nodes on the second transmission line, and loudspeaker m2 can be regarded as the last node on the second transmission line. It can be understood that the intermediate nodes on the transmission line include a current shunt device, and the circuit structure of each node on the second transmission line is as shown in Figure 7 , which will not be described here.

[0163] In some possible embodiments, only the noise feedback signal can be transmitted through wired communication among the noise cancellation signal and the noise feedback signal, in which case the circuit structure of the microphone group in Figure 2C is replaced by Figure 7 the circuit structure shown in FIG. 4, so that the noise reduction processing system shown in FIG. 4 can be implemented. Figure 7The deployment of the noise reduction processing system shown is that the noise signal is transmitted through wired communication, the noise cancellation signal is transmitted through wireless communication, and the noise feedback signal is transmitted through wired communication.

[0164] Figure 7 is a schematic diagram of circuit connection of a microphone and a noise reduction processing node provided by an embodiment of the present application. In Figure 6B , the microphone group includes microphone 1, …, microphone m1, m1 being a positive integer, and each microphone is connected to the noise reduction processing node through other transmission lines, which are different from the first transmission lines. Exemplarily, different microphones are connected to the noise reduction processing node through different transmission lines, for example, the other transmission lines include transmission line 1, …, transmission line m1, wherein microphone 1 is connected to the noise reduction processing node based on transmission line 1, …, and microphone m1 is connected to the noise reduction processing node based on transmission line m1.

[0165] In Figure 5A , the noise feedback signal is transmitted through wired communication, specifically: each microphone generates a radio frequency signal, the radio frequency signal carries the noise feedback signal, the radio frequency signal is transmitted to the noise reduction processing node along the other transmission lines, and the noise reduction processing node obtains the noise feedback signal based on the radio frequency signal. In some possible embodiments, different microphones can also be connected to the noise reduction processing node through the same transmission line, in which case, the connection of each microphone to the noise reduction processing node can refer to the related description of the connection mode of each loudspeaker in the loudspeaker group to the noise reduction processing node in Figure 8A , which will not be described herein again.

[0166] In some possible embodiments, if the noise signal, the noise cancellation signal, and the noise feedback signal are all transmitted through wireless communication, the connection mode between each noise collection node and the noise reduction processing node in Figure 2D may be replaced by the connection mode shown in Figure 8A .Thus, the deployment of the noise reduction processing system shown in Figure 8A may be implemented. Figure 8A is a schematic diagram of circuit connection of a noise collection node and a noise reduction processing node provided by an embodiment of the present application. In Figure 8A , each noise collection node is separately configured with a wireless transceiver, and the wireless device of the noise collection node and the wireless transceiver of the noise reduction processing node can implement wireless communication between the noise collection node and the noise reduction processing node. Exemplarily, the power supply of each noise collection node and the noise reduction processing node can be unified by one power supply and one transmission line (not shown), or can be independently powered, which is not limited herein. Figure 8A

[0167] In Figure 8BIn this process, the noise signal is transmitted wirelessly as follows: each noise acquisition node transmits a radio frequency signal through its own wireless transceiver based on the acquired noise signal. The radio frequency signal carries the noise signal. The noise reduction processing node receives the radio frequency signal through its own wireless transceiver and obtains the noise signal based on the radio frequency signal.

[0168] In some possible embodiments, in order to save Figure 8B The number of wireless transceivers deployed in the system can be adjusted; multiple noise acquisition sensors can also be connected via transmission lines and share a single wireless transceiver. See also... Figure 8B , Figure 8B This is a schematic diagram of the circuit connection between a noise acquisition node and a noise reduction processing node provided in an embodiment of this application. Figure 8B In this system, multiple noise acquisition nodes and a wireless transceiver are connected to the first transmission line, while the noise reduction processing node is not connected to the first transmission line. The wireless transceiver on the first transmission line and the wireless transceiver on the noise reduction processing node can enable wireless communication between the noise reduction processing node and any noise acquisition node on the first transmission line.

[0169] Depend on Figure 8A It can be seen that the wireless transceiver and multiple noise acquisition nodes connected to the first transmission line are powered by a unified power supply. Noise acquisition node 1 is the first node on the first transmission line, and noise acquisition node 2 is the middle node on the first transmission line. Therefore, noise acquisition node 2 includes a current shunt device 1. The circuit structure of each noise acquisition node will not be described in detail here. Figure 8B Circuit structure of the noise reduction processing node and Figure 5A The circuit structure of the noise reduction processing nodes is the same.

[0170] exist Figure 9A In this process, the noise signal is transmitted wirelessly as follows: each noise acquisition node outputs a radio frequency signal based on the acquired noise signal. The radio frequency signal carries the noise signal and is transmitted along the first transmission line to the wireless transceiver on the first transmission line. The wireless transceiver then transmits the radio frequency signal outward. The wireless transceiver of the noise reduction processing node receives the radio frequency signal and obtains the noise signal from it.

[0171] In some possible embodiments, the noise signal can also be transmitted via wired and wireless communication. Figure 2E The connection method between each noise acquisition node and the noise reduction processing node can be replaced with... Figure 9A The circuit structure shown allows for the implementation of... Figure 9A The deployment of the noise reduction processing system is shown. Figure 2E This is a schematic diagram of the circuit connection between a noise acquisition node and a noise reduction processing node provided in an embodiment of this application. Figure 9AIn this system, a group of noise acquisition nodes, namely noise acquisition node 1, ..., noise acquisition node j, are connected to the noise reduction processing node via the first transmission line to achieve wired communication with the noise reduction processing node; another group of noise acquisition nodes, namely noise acquisition node j+1, ..., noise acquisition node n, are each equipped with a wireless transceiver to achieve wireless communication with the noise reduction processing node. Here, n is a positive integer, and j is a positive integer less than n.

[0172] For example, in contrast Figure 5A ,exist Figure 2E In the noise acquisition nodes, the noise acquisition nodes in noise acquisition nodes 1, ..., j can be the nodes where the wind noise sensor or the road noise sensor is located, and the noise acquisition nodes in noise acquisition nodes j+1, ..., n can be the nodes where the tire noise sensor or the engine noise sensor is located.

[0173] In some possible embodiments, considering that wired and wireless communication can serve as backups for each other, it is also possible to... Figure 9B By adding a wireless transceiver and a power divider or switching element to each noise acquisition node, this can also achieve... Figure 9B The deployment of the noise reduction processing system is shown. Here, a power divider, also known as a power splitter, is a device that splits the energy of one input signal into two or more outputs of equal or unequal energy. Conversely, it can also combine the energy of multiple signals into one output, in which case it can also be called a combiner.

[0174] For example, see Figure 9B , Figure 9B This is a schematic diagram of the circuit connection between a noise acquisition node and a noise reduction processing node provided in another embodiment of this application. Figure 9B In this diagram, noise acquisition nodes 1, ..., n are all connected to the noise reduction processing node via the first transmission line. For details regarding the internal connection structure of each noise acquisition node, please refer to the aforementioned description of the current shunting device. Figure 9A As shown, it will not be elaborated further here.

[0175] For example, in Figure 9B In the case where the devices connected to the wireless transceiver at each noise acquisition node are all switching elements, the desired effect can be achieved by controlling the switching elements of the corresponding noise acquisition node. Figure 9B The functions shown. For example, in Figure 9AIn the diagram, for noise acquisition nodes 1, ..., j, the first and third terminals of the switching elements at each node are connected (this can also be described as the switching elements being in a closed state). Thus, the noise signals acquired by nodes 1, ..., j can only be transmitted to the noise reduction processing node along the first transmission line. For noise acquisition nodes j+1, ..., n, the first and second terminals of the switching elements at each node are connected (this can also be described as the switching elements being in an open state). The first terminal of the switching element is used to connect to the radio frequency unit, and the second terminal is used to connect to the wireless transceiver. Thus, the noise signals acquired by nodes j+1, ..., n are transmitted to the noise reduction processing node through their respective wireless transceivers. It can be seen that the switching elements allow selection between wired and wireless communication.

[0176] For example, in Figure 9B In the case where the wireless transceiver devices at each noise acquisition node are all connected to power dividers, it is also possible to achieve... Figure 9B The functions are shown below. Taking noise acquisition node 1 as an example (the description of noise acquisition node 1 is similar to that of the other noise acquisition nodes), based on the characteristics of the power divider, when noise acquisition node 1 needs to transmit noise signals via wired communication, it controls the radio frequency signal carrying the noise signal to be transmitted sequentially through the first and third terminals of the power divider to the first transmission line. Similarly, taking noise acquisition node n as an example (the description of noise acquisition node n is similar to that of the other noise acquisition nodes), when noise acquisition node n needs to transmit noise signals via wireless communication, it controls the radio frequency signal carrying the noise signal to be transmitted sequentially through the first and second terminals of the power divider to its wireless transceiver device, which then transmits the signal. Therefore, it can be seen that a power divider can also be used to select between wired and wireless communication.

[0177] For example, in Figure 9B In this system, when environmental interference exists or the wireless channel transmission conditions do not meet preset requirements, wired communication is uniformly selected by controlling the switching elements or power dividers within each noise acquisition node on the first transmission line; when a transmission line failure or a current shunting device malfunction is detected, wireless communication is uniformly selected by controlling the switching elements or power dividers within each noise acquisition node on the first transmission line. This achieves flexible switching between wireless and wired communication. In some possible embodiments, in Figures 5A-9BIn this process, the switching elements or power dividers within each noise acquisition node on the transmission line may not be subject to unified control. Instead, they may control their own switching elements or power dividers according to their own actual situation or needs. No specific restrictions are imposed here.

[0178] Understandable. Figure 1 In this process, the channel encoding and decoding configured in the baseband processing unit of each node connected to the first transmission line must support both wired and wireless communication. This allows the node to reuse not only its own baseband processing unit but also its own radio frequency unit when transmitting signals via wired and / or wireless communication, without the need to add additional processing units, which helps reduce the deployment cost of the network.

[0179] It is understandable that the above Figures 5A-9B This application provides an example diagram of the circuit structure for deploying a corresponding noise reduction processing system. However, the embodiments described herein are not limited to implementing the above-described circuit. Figures 5A-9B The deployment of the noise reduction processing system shown is only Figure 5A As shown in the diagram. In some possible embodiments, for implementation Figure 5B When any of the circuit diagrams shown is functional, there may be more or fewer components than in the corresponding circuit diagram, for example, the above. Figure 8B , Figure 5A or Figure 1 Each noise reduction processing node may also include a duplexer, which is located above the radio frequency (RF) unit and connected in series with it. Here, the duplexer isolates signals from different frequency bands. The duplexer typically consists of two sets of bandpass filters of different frequencies to prevent interference between the transmitted and received signals.

[0180] Understandable, with Figure 5A For example, the above Figure 1 The noise reduction processing device shown can be regarded as Figure 5A The noise reduction processing node shown implies that it has the two input interfaces (i.e., the first input interface and the second input interface) and one output interface (i.e., the first output interface). In some possible embodiments, the above... Figure 5A The noise reduction processing device shown can also be regarded as ​ The circuit structure shown in the second part can be regarded as... ​ The noise reduction processor in the text is not specifically defined here.

[0181] In the above-mentioned embodiments, the description of each embodiment is focused on, and the parts not described in detail in a certain embodiment can be referred to the relevant description of other embodiments. In addition, in each embodiment of the present application, the terms and / or descriptions of each embodiment are consistent and can be mutually referred to if there is no special description and logical conflict. The technical features in different embodiments can be combined to form new embodiments according to their inherent logical relationship.

[0182] It should be noted that all or part of the steps of various methods in the above-mentioned embodiments can be completed by programs instructing related hardware, and the programs can be stored in a computer readable storage medium, including read-only memory (ROM), random access memory (RAM), programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), one-time programmable read-only memory (OTPROM), electrically erasable programmable read-only memory (EEPROM), compact disc read-only memory (CD-ROM) or other optical disk storage, magnetic disk storage, magnetic tape storage, or any other medium capable of carrying or storing data which can be read by a computer.

[0183] The technical solutions of the present application or the essential part or the whole or part of the technical solutions can be embodied in the form of a software product. The computer program product is stored in a storage medium and includes instructions for making a device (which can be a personal computer, a server, or a network device, a robot, a single-chip microcomputer, a chip, a robot, etc.) execute all or part of the steps of the method described in each embodiment of the present application.

Claims

1. A noise reduction processing system, characterized by comprising: The system comprises a noise collection sensor, a speaker, a microphone and a noise reduction processing device, wherein, The noise collection sensor is configured to send a noise signal to a first input interface of the noise reduction processing device; The microphone is configured to send a noise feedback signal to a second input interface of the noise reduction processing device; The noise reduction processing device is configured to send a noise cancellation signal to the speaker through a first output interface, the noise cancellation signal being generated based on the noise signal and the noise feedback signal; At least one of the second input interface and the first output interface is a wireless interface.

2. The system of claim 1, wherein, At least one of the second input interface and the first output interface is a wireless interface, comprising: Both the second input interface and the first output interface are wireless interfaces; The second input interface is a wireless interface, and the first output interface is a wired interface; or The second input interface is a wired interface, and the first output interface is a wireless interface.

3. The system of claim 1, wherein, The wireless interface communicates based on a star flash wireless communication protocol.

4. The system of claim 1, wherein, The noise collection sensor is disposed outside a cabin of a vehicle, and the microphone, the speaker and the noise reduction processing device are disposed inside the cabin of the vehicle.

5. The system of claim 1, wherein, The speaker and / or the microphone are arranged at a seat in the vehicle.

6. The system of claim 1, wherein, The position of the speaker in the vehicle is adjacent to the position of the microphone in the vehicle.

7. The system of claim 1, wherein, When the microphone is in a noise collection mode, the microphone is configured to collect the noise feedback signal.

8. The system of claim 1, wherein, The noise collection sensor comprises at least one of a wind noise sensor, a road noise sensor, a tire noise sensor and an engine noise sensor.

9. The system according to any of claims 1-8, characterized in that, The noise collection sensor is connected to the noise reduction processing device through a transmission line.

10. The system of claim 9, wherein, The noise collection sensor comprises a first noise sensor and a second noise sensor, and the type of the first noise sensor is different from the type of the second noise sensor. The noise collection sensor is connected to the noise reduction processing device through a transmission line, comprising that the first noise sensor is connected to the noise reduction processing device through a first transmission line, and the second noise sensor is connected to the noise reduction processing device through a second transmission line.

11. The system of claim 1, wherein, The microphone or the speaker is connected to the noise reduction processing device through a transmission line.

12. A noise reduction processing apparatus characterized by comprising: The device comprises a first input interface, a second input interface and a first output interface, wherein, The first input interface is configured to receive a noise signal from a noise collection sensor; The second input interface is configured to receive a noise feedback signal from a microphone; The first output interface is configured to send a noise cancellation signal to a speaker, the noise cancellation signal being generated based on the noise signal and the noise feedback signal; At least one of the second input interface and the first output interface is a wireless interface.

13. The apparatus of claim 12, wherein, At least one of the second input interface and the first output interface is a wireless interface, comprising: Both the second input interface and the first output interface are wireless interfaces; The second input interface is a wireless interface, and the first output interface is a wired interface; or The second input interface is a wired interface, and the first output interface is a wireless interface.

14. The apparatus of claim 12, wherein, The first input interface is a wired interface or a wireless interface.

15. The apparatus of claim 12, wherein, The wireless interface communicates based on a star flash wireless communication protocol.

16. The apparatus of claim 12, wherein, The noise collection sensor includes at least one of a wind noise sensor, a road noise sensor, a tire noise sensor, and an engine noise sensor.

17. The apparatus of claim 12, wherein, The speaker and / or the microphone are disposed at a seat within the vehicle.

18. The apparatus of any of claims 12-17, wherein, The speaker is positioned proximate to the microphone within the vehicle.

19. A vehicle characterized by comprising: The vehicle includes the noise reduction processing system of any one of claims 1-11, or the noise reduction processing apparatus of any one of claims 12-18.

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