Laser projection equipment and noise reduction method of laser projection equipment

Abstract

The invention relates to laser projection equipment and a noise reduction method of the laser projection equipment, and relates to the technical field of laser projection equipment. The laser projection equipment comprises a controller, a sound wave generator and a laser projector, wherein the sound wave generator and the laser projector are connected with the controller; the controller is configured to control the sound wave generator to generate and output an initial audio signal when the laser projector works, and the initial audio signal is used for counteracting a pre-stored initial noise signal; acquiring a machine noise signal when the laser projector starts to work, adjusting the initial audio signal based on the machine noise signal, and controlling the sound wave generator to generate and output a target audio signal; the target audio signal is the adjusted initial audio signal and is used for counteracting the machine noise signal.

Description

Technical Field

[0001] The present disclosure relates to the technical field of laser projection equipment, and in particular to a laser projection equipment and a noise reduction method for the laser projection equipment. Background Art

[0002] At present, in the field of laser projection equipment, the reverse silencing technology is mainly used to eliminate the noise generated by the machine. There are two main methods of this technology: one is that the sound collector detects the actual noise emitted by the radiator of the laser projection equipment in real time, and then the signal generator calculates the audio signal used to offset the actual noise to output the audio signal to achieve real-time and accurate noise reduction, but this method has the problems of excessive data volume and computational complexity and high cost; the other is to pre-store the noise data of the radiator, and when the laser projection equipment is working, the signal generator calls the pre-stored noise data to generate and send an audio signal to achieve the reverse sound wave silencing effect. This method has less computational complexity and data, low cost, and is easy to implement. However, due to equipment aging and other conditions, the actual noise of the radiator is not fixed, but changing. This method cannot adjust the audio signal immediately, and the reverse sound wave silencing is prone to failure. Therefore, there is an urgent need for an accurate noise reduction method with small computational complexity, easy implementation and good effect. Summary of the invention

[0003] In order to solve the above technical problems or at least partially solve the above technical problems, the present disclosure provides a laser projection device and a noise reduction method for the laser projection device, which can improve the noise reduction effect.

[0004] In order to achieve the above objectives, the technical solutions provided by the embodiments of the present disclosure are as follows:

[0005] In a first aspect, the present disclosure provides a laser projection device, comprising: a controller, and a sound wave generator and a laser projector connected to the controller;

[0006] The controller is configured to: when the laser projector is working, control the sound wave generator to generate and output an initial audio signal, wherein the initial audio signal is used to offset the pre-stored initial noise signal;

[0007] When the laser projector starts working, a machine noise signal is obtained, the initial audio signal is adjusted based on the machine noise signal, and the sound wave generator is controlled to generate and output a target audio signal; the target audio signal is the adjusted initial audio signal, which is used to offset the machine noise signal.

[0008] As an optional implementation of the embodiment of the present disclosure, the controller obtains a machine noise signal when the laser projector starts working, adjusts the initial audio signal based on the machine noise signal, and controls the sound wave generator to generate and output a target audio signal, and is specifically configured as follows:

[0009] When the laser projection device starts to work, a machine noise signal at a first gear value is obtained;

[0010] Determining an initial noise signal corresponding to a pre-stored first gear value from pre-stored first relationship data between the gear value and the noise signal;

[0011] Based on the machine noise signal at the first gear value, adjusting the initial noise signal corresponding to the first gear value, and adjusting the initial noise signals corresponding to other gear values ​​in the first relationship data, to obtain second relationship data between the gear value and the noise signal;

[0012] According to the second relationship data, the sound wave generator is controlled to generate and output a target audio signal to cancel the machine noise signal at each gear value.

[0013] As an optional implementation of the embodiment of the present disclosure, the controller adjusts the initial noise signal corresponding to the first gear value based on the machine noise signal under the first gear value, and adjusts the initial noise signals corresponding to other gear values ​​in the first relationship data to obtain the second relationship data between the gear value and the noise signal, which is specifically configured as follows:

[0014] For the first relationship data, calculating a noise difference between an initial noise signal corresponding to a first gear value and a machine noise signal at the first gear value;

[0015] replacing the initial noise signal corresponding to the first gear value with the machine noise signal at the first gear value;

[0016] According to the noise difference, the initial noise signals corresponding to other gear values ​​are corrected and compensated to obtain the second relationship data.

[0017] As an optional implementation of the embodiment of the present disclosure, the controller corrects and compensates the initial noise signals corresponding to other gear values ​​according to the noise difference to obtain the second relationship data, which is specifically configured as follows:

[0018] Determining initial noise signals corresponding to other gear values ​​from the first relationship data;

[0019] According to the initial noise signals and noise differences corresponding to other gear values, the target noise signals corresponding to other gear values ​​are calculated;

[0020] With respect to the first relationship data, the initial noise signals corresponding to other gear values ​​are replaced with the corresponding target noise signals to obtain the second relationship data.

[0021] As an optional implementation of the embodiment of the present disclosure, the laser projector further includes a temperature sensor;

[0022] The controller is further configured to: obtain a device temperature value collected by a temperature sensor when controlling the laser projector to work;

[0023] When the device temperature value is greater than or equal to a preset threshold, the first gear value is changed to another gear value;

[0024] Determine target noise signals corresponding to other gear values ​​from the second relationship data;

[0025] Target audio signals corresponding to other gear values ​​are generated and output according to the target noise signal to offset the target noise signals at other gear values.

[0026] In a second aspect, the present disclosure provides a noise reduction method for a laser projection device, comprising:

[0027] When the laser projection device is working, the sound wave generator is controlled to generate and output an initial audio signal, wherein the initial audio signal is used to offset the pre-stored initial noise signal;

[0028] When the laser projector starts working, a machine noise signal is acquired, the initial audio signal is adjusted based on the machine noise signal, and the sound wave generator is controlled to generate and output a target audio signal; the target audio signal is the adjusted initial audio signal, which is used to offset the machine noise signal.

[0029] As an optional implementation of the embodiment of the present disclosure, when the laser projector starts working, a machine noise signal is acquired, the initial audio signal is adjusted based on the machine noise signal, and the sound wave generator is controlled to generate and output a target audio signal, including:

[0030] When the laser projection device starts to work, a machine noise signal at a first gear value is obtained;

[0031] Determining an initial noise signal corresponding to the first stored gear value from pre-stored first relationship data between the gear value and the noise signal;

[0032] Based on the machine noise signal at the first gear value, adjusting the initial noise signal corresponding to the first gear value, and adjusting the initial noise signals corresponding to other gear values ​​in the first relationship data, to obtain second relationship data between the gear value and the noise signal;

[0033] According to the second relationship data, the sound wave generator is controlled to generate and output the target audio signal to offset the machine noise signal at each gear value.

[0034] As an optional implementation of the embodiment of the present disclosure,

[0035] Based on the machine noise signal at the first gear value, adjusting the initial noise signal corresponding to the first gear value, and adjusting the initial noise signals corresponding to other gear values ​​in the first relationship data, to obtain second relationship data between the gear value and the noise signal, including:

[0036] For the first relationship data, calculating a noise difference between an initial noise signal corresponding to the first gear value and a machine noise signal at the first gear value;

[0037] replacing an initial noise signal corresponding to the first gear value with a machine noise signal at the first gear value;

[0038] According to the noise difference, the initial noise signals corresponding to the other gear values ​​are corrected and compensated to obtain the second relationship data.

[0039] As an optional implementation of the embodiment of the present disclosure,

[0040] The step of correcting and compensating the initial noise signals corresponding to the other gear values ​​according to the noise difference to obtain the second relationship data includes:

[0041] Determining, from the first relationship data, initial noise signals corresponding to the other gear values;

[0042] Calculating a target noise signal corresponding to the other gear value according to the initial noise signal corresponding to the other gear value and the noise difference;

[0043] With respect to the first relationship data, the initial noise signals corresponding to the other gear values ​​are replaced with corresponding target noise signals to obtain the second relationship data.

[0044] As an optional implementation of the embodiment of the present disclosure, the method further includes:

[0045] When the laser projector starts working, obtaining a device temperature value collected by a temperature sensor;

[0046] When the device temperature value is greater than or equal to a preset threshold, changing from the first gear value to other gear values;

[0047] Determining the target noise signal corresponding to the other gear values ​​from the second relationship data;

[0048] A target audio signal corresponding to the other gear value is generated according to the target noise signal and outputted to offset the target noise signal at the other gear value.

[0049] In a third aspect, the present disclosure provides an electronic device, comprising: a processor, a memory, and a computer program stored in the memory and executable on the processor, wherein when the computer program is executed by the processor, the noise reduction method for the laser projection device as described in the second aspect is implemented.

[0050] In a fourth aspect, the present disclosure provides a computer-readable storage medium, including: a computer program is stored on the computer-readable storage medium, and when the computer program is executed by a processor, the noise reduction method of the laser projection device shown in the second aspect is implemented.

[0051] In a fifth aspect, the present disclosure provides a computer program product, which includes a computer program. When the computer program is executed on a computer, the computer implements the noise reduction method for the laser projection device as shown in the second aspect.

[0052] The embodiment of the present disclosure provides a laser projection device and a noise reduction method for the laser projection device, wherein the laser projection device includes a controller, and a sound wave generator and a laser projector connected to the controller. The controller is configured to: when the laser projector is working, control the sound wave generator to generate and output an initial audio signal for offsetting a pre-stored initial noise signal; when the laser projector starts working, obtain a machine noise signal, and then adjust the initial audio signal based on the machine noise signal to adapt to changes in the machine noise signal caused by other conditions such as equipment aging, and control the sound wave generator to generate and output a target audio signal obtained after adjusting the initial audio signal for offsetting the machine noise signal, thereby achieving continuous noise reduction during the operation of the device. The laser projection device of the present disclosure can generate an initial audio signal for noise reduction based on a pre-stored initial noise signal, and considering that the machine noise signal will change, obtain a machine noise signal once when the device starts working, no longer based on the pre-stored initial audio signal for noise reduction, but according to the machine noise signal Adaptively adjust the output audio signal, no real-time noise acquisition is required, the amount of calculation is small and easy to implement, and the accuracy of noise reduction of the laser projection device is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and, together with the description, serve to explain the principles of the present disclosure.

[0054] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0055] Figure 1Schematic diagrams of scenarios in some embodiments provided for the embodiments of the present disclosure;

[0056] Figure 2 The application scenario of a laser projection device provided by the embodiment of the present disclosure is positively viewed Figure 1 ;

[0057] Figure 3 A side view of an application scenario of a laser projection device provided by an embodiment of the present disclosure;

[0058] Figure 4 The application scenario of a laser projection device provided by the embodiment of the present disclosure is positively viewed Figure 2 ;

[0059] Figure 5 A block diagram of a configuration of a control device 100 provided in an embodiment of the present disclosure;

[0060] Figure 6 A hardware configuration block diagram of a laser projection device 200 provided in an embodiment of the present disclosure;

[0061] Figure 7 A schematic diagram of software configuration of the laser projection device 200 provided in an embodiment of the present disclosure;

[0062] Figure 8 A schematic diagram of a process flow of a noise reduction method for a laser projection device provided in an embodiment of the present disclosure;

[0063] Fig. 9 A schematic diagram of the noise reduction principle provided by an embodiment of the present disclosure;

[0064] Fig.10 A schematic diagram of the structure of an electronic device provided in an embodiment of the present disclosure. DETAILED DESCRIPTION

[0065] In order to more clearly understand the above-mentioned objectives, features and advantages of the present disclosure, the scheme of the present disclosure will be further described below. It should be noted that the embodiments of the present disclosure and the features in the embodiments can be combined with each other without conflict.

[0066] In the following description, many specific details are set forth to facilitate a full understanding of the present disclosure, but the present disclosure may also be implemented in other ways different from those described herein; it is obvious that the embodiments in the specification are only part of the embodiments of the present disclosure, rather than all of the embodiments.

[0067] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure or the prior art, the technical terms required to be used in the embodiments or the prior art description are briefly introduced below:

[0068] Laser projection equipment, including but not limited to laser TV. Laser projection equipment uses a laser projector to convert electrical energy into light energy. The generated laser beam is projected onto the screen through the combined effects of the optical system, lighting system, and lens system to form a projection image.

[0069] When the laser projection equipment is working, it uses the form of "radiator + fan" to dissipate heat. The fan needs to rotate to form wind pressure, form air flow, produce convection heat transfer effect, and dissipate heat for the whole machine. The high-speed rotation of the fan will form a sound field. In addition, there is a fluorescent wheel in the optical system of the laser projection equipment that stimulates fluorescence and needs to rotate at high speed, and the diffusion wheel that eliminates speckle needs to rotate at high speed. The galvanometer that forms a 4K effect needs to vibrate at high speed, which will form a sound field. In addition, components such as inductors in the circuit system will also form a sound field under the action of voltage and current. The above components form a sound field and generate noise, which will affect the user experience.

[0070] At present, in the field of laser projection equipment, reverse silencing technology is mainly used to eliminate the noise signal generated by the machine. This technology has two directions:

[0071] One is to use a pickup microphone to detect the actual noise of the machine in real time and send it to the computing processor. The processor calculates the reverse sound wave data and sends it to the sound wave generator to generate reverse sound waves to eliminate the machine noise. Its advantage is that it can generate reverse sound wave data in real time and accurately to achieve the effect of precise noise elimination. The disadvantage is that the amount of data and computing power is too large, and the cost is high.

[0072] The second is to pre-store the noise data of the machine, call the pre-stored noise data during the operation of the machine, generate and send reverse sound waves, and achieve the reverse sound wave silencing effect. Its advantages are small amount of calculation and data, low cost, and easy implementation. The disadvantage is that after the actual noise of the machine changes, the reverse sound wave cannot be adjusted immediately, and the reverse sound wave silencing is easy to fail.

[0073] In order to solve some or all of the above technical problems, the embodiments of the present disclosure provide a laser projection device and a noise reduction method for the laser projection device, wherein the laser projection device includes a controller, and a sound wave generator and a laser projector connected to the controller. The controller is configured to: when the laser projector is working, control the sound wave generator to generate and output an initial audio signal for offsetting a pre-stored initial noise signal; when the laser projector starts working, obtain a machine noise signal, and then adjust the initial audio signal based on the machine noise signal to adapt to changes in the machine noise signal caused by other conditions such as equipment aging, and control the sound wave generator to generate and output a target audio signal obtained after adjusting the initial audio signal for offsetting the machine noise signal, thereby achieving continuous noise reduction during the operation of the device.

[0074] The laser projection device disclosed in the present invention can generate an initial audio signal according to a pre-stored initial noise signal for noise reduction. Taking into account that the machine noise signal may change, a machine noise signal is acquired once when the device starts working. No noise reduction is no longer performed based on the pre-stored initial audio signal. Instead, the output audio signal is adaptively adjusted according to the machine noise signal. There is no need to collect noise in real time, the amount of calculation is small and it is easy to implement, thereby improving the accuracy of noise reduction of the laser projection device.

[0075] It should be emphasized that the laser projection device provided in the embodiment of the present disclosure only collects the actual machine noise signal when the laser projector starts working. There is no need to continuously collect the noise signal in real time during the operation of the laser projector. The data volume is small, and the computational complexity of the reverse acoustic wave noise reduction is reduced. Moreover, it can adapt to the actual changes in the noise signal to achieve effective noise reduction.

[0076] Figure 1 Schematic diagram of scenes in some embodiments provided by the present disclosure. Figure 1 As shown, it includes a control device 100, a laser projection device 200, a smart device 300 and a server 400. A user can operate the laser projection device 200 through the smart device 300 or the control device 100 to play audio and video resources on the laser projection device 200.

[0077] In some embodiments, the control device 100 may be a remote controller, and the communication between the remote controller and the laser projection device 200 includes infrared protocol communication, Bluetooth protocol communication, wireless or other wired methods to control the laser projection device 200. The user may input user commands by pressing buttons on the remote controller, voice input, control panel input, etc. to control the laser projection device 200. In some embodiments, the control device 100 may also use a mobile terminal, a tablet computer, a computer, a laptop computer, and other smart devices to control the laser projection device 200.

[0078] In some embodiments, the smart device 300 can install software applications with the laser projection device 200, and achieve connection and communication through a network communication protocol to achieve the purpose of one-to-one control operation and data communication. The audio and video content displayed on the smart device 300 can also be transmitted to the laser projection device 200 to achieve a synchronous display function. The laser projection device 200 also communicates data with the server 400 through a variety of communication methods. The laser projection device 200 can be allowed to communicate and connect through a local area network (LAN), a wireless local area network (WLAN) and other networks. The server 400 can provide various content and interactions to the laser projection device 200. In addition to providing a broadcast receiving television function, the laser projection device 200 can also provide an intelligent network TV function that provides a computer support function.

[0079] For example, Figure 2 As shown, Figure 2 The application scenario of a laser projection device provided by the embodiment of the present disclosure is positively viewed Figure 1 In the top projection scenario, the laser projection device 200 is located at the top of the projection scene, such as the ceiling of the living room. The laser projection device 200 projects toward the screen. In the embodiment of the present disclosure, the laser projection device 200 adopts a left-right symmetrical layout of various components, such as Figure 2 As shown, the speaker is located at the farthest end, the sound collector is adjacent to the speaker and the host, and the sound wave generator is arranged in the middle of the sound collector, wherein the host includes a controller and a laser projector, which are not specifically shown in the figure. It can be understood that the speaker, the sound collector, the host, and the sound wave generator are located inside the housing.

[0080] like Figure 3 As shown, Figure 3 A side view of an application scenario of a laser projection device provided in an embodiment of the present disclosure, wherein the laser projection device 200 is turned on to project onto a screen and the radiator is turned on. When the device first starts working, the radiator is in an initial gear, such as the lowest gear. The laser projection device 200 controls the sound collector to collect the machine noise signal of the radiator at the initial gear, and then generates a first audio signal corresponding to the initial gear according to the machine noise signal, that is, reverse sound wave data known to those skilled in the art, and controls the sound wave generator to output the first reverse sound wave data. The output first reverse sound wave covers the illustrated area, thereby offsetting the noise in the viewing area. In addition, the laser projection device 200 updates the correspondence between the preset gear value and the noise signal according to the collected machine noise signal actually emitted by the radiator under the initial gear, so that when the subsequent working gear of the radiator continues to change, that is, when the working gear value changes, it can find the noise signal corresponding to the working gear value according to the updated correspondence, thereby generating a second audio signal (second reverse sound wave data) corresponding to the working gear value, so as to control the sound wave generator to adapt to the gear change (that is, the noise signal change) and output the corresponding second reverse sound wave data, thereby achieving fast and effective noise reduction.

[0081] Figure 4 The application scenario of a laser projection device provided by the embodiment of the present disclosure is positively viewed Figure 2 ,like Figure 4 As shown, the sound collector can be arranged near the host, and the sound wave generator can be integrated with the sound, so as to facilitate line connection, reduce structural components, and facilitate installation. Optionally, the sound collector can also be set in the viewing area to facilitate sound pickup, which is not specifically shown in the figure and is not limited by the present disclosure.

[0082] Figure 5 FIG. 1 is a block diagram of a configuration of a control device 100 provided in an embodiment of the present disclosure. Figure 5As shown, the control device 100 includes a controller 110, a communication interface 130, a user input / output interface 140, a memory, and a power supply. The control device 100 can receive the user's input operation instructions, and convert the operation instructions into instructions that the laser projection device 200 can recognize and respond to, and play the role of an interactive intermediary between the user and the laser projection device 200. The communication interface 130 is used to communicate with the outside, and includes at least one of a WIFI chip, a Bluetooth module, NFC or an alternative module. The user input / output interface 140 includes at least one of a microphone, a touchpad, a sensor, a button or an alternative module.

[0083] Figure 6 FIG. 2 is a hardware configuration block diagram of a laser projection device 200 provided in an embodiment of the present disclosure. Figure 6 As shown, the laser projection device 200 includes: a tuner and demodulator 210, a communicator 220, a detector 230, an external device interface 240, a controller 250, a display 260, an audio output interface 270, a memory, a power supply, etc.

[0084] The detector 230 includes a sound collector; the controller 250 includes a central processing unit, a video processor, an audio processor, a graphics processor, a RAM, a ROM, and a first interface to an nth interface for input / output. The display 260 can be a laser projector, and can also be a projection device and a projection screen. In the embodiment of the present disclosure, the display 260 of the laser projection device 200 is a laser projector, including a radiator, which can be a cooling fan.

[0085] The tuner-demodulator 210 receives broadcast television signals by wired or wireless reception, and demodulates audio and video signals, such as EPG data signals, from multiple wireless or wired broadcast television signals. The detector 230 is used to collect signals from the external environment or interact with the outside. The controller 250 and the tuner-demodulator 210 can be located in different split devices, that is, the tuner-demodulator 210 can also be in an external device of the main device where the controller 250 is located, such as an external set-top box.

[0086] The laser projection device 200 further includes a sound wave generator connected to the controller 250. Figure 6 Not shown in the figure.

[0087] In some embodiments, the controller 250 controls the operation of the laser projection device and responds to user operations through various software control programs stored in the memory. The controller 250 controls the overall operation of the laser projection device 200. The user can input user commands in the graphical user interface (GUI) displayed on the display 260, and the user input interface receives the user input commands through the graphical user interface (GUI). Alternatively, the user can input user commands by inputting specific sounds or gestures, and the user input interface recognizes the sounds or gestures through sensors to receive user input commands. The output interface (display 260, and / or, audio output interface 270) is configured to output user interaction information; the communicator 220 is used to communicate with the server 400 or other devices.

[0088] The embodiment of the present disclosure provides a laser projection device 200, which includes a controller 250, and a sound collector, a sound wave generator and a laser projector connected to the controller 250, wherein the laser projector includes a radiator.

[0089] The controller 250 is configured to: when the laser projector is working, control the sound wave generator to generate and output an initial audio signal, where the initial audio signal is used to offset the pre-stored initial noise signal;

[0090] When the laser projector starts working, a machine noise signal is obtained, the initial audio signal is adjusted based on the machine noise signal, and the sound wave generator is controlled to generate and output a target audio signal; the target audio signal is the adjusted initial audio signal, which is used to offset the machine noise signal.

[0091] In the above embodiment, the laser projection device 200 generates and outputs an initial audio signal for noise reduction based on a pre-stored initial noise signal when the laser projector is working, and obtains an actual machine noise signal when the laser projector just starts working to adjust the initial audio signal according to the machine noise signal to adapt to changes in the noise signal, and generates and outputs a target audio signal that can offset the machine noise signal during the subsequent continuous operation of the laser projection device. There is no need to continuously collect machine noise signals during the operation process, the amount of calculation is small, and it can effectively adapt to the changing actual noise for precise noise reduction, thereby improving the noise reduction effect of the laser projection device.

[0092] In some embodiments, the controller 250 controls the sound wave generator to generate and output an initial audio signal when the laser projector is working, and is specifically configured as follows: according to the first relationship data between the gear value and the noise signal stored in advance, the sound wave generator is controlled to generate and output the initial audio signal corresponding to each gear value. The initial audio signal and the initial noise signal are in opposite phases and can cancel each other out, thereby achieving a machine noise-free effect in the viewing area of ​​the laser projection device. Among them, the first relationship data can be determined in the following manner: in an experimental environment, the radiator is controlled to work at different gear values, and the noise signals at different gear values ​​are collected by the sound collector, and they are stored accordingly. It should be noted that the difference in noise signals between different gears remains unchanged.

[0093] The first relationship data may be preset in the device storage space when the laser projection device leaves the factory. In the disclosed embodiment, the first relationship data supports adjustment and update, and the laser projection device collects the actual machine noise signal each time it is turned on to adjust the first relationship data. When the laser projection device is turned on this time, the first relationship data may be the relationship data adjusted and stored after the last startup.

[0094] In some embodiments, the controller 250 obtains a machine noise signal when the laser projector starts working, adjusts the initial audio signal based on the machine noise signal, and controls the sound wave generator to generate and output a target audio signal. Specifically, the controller 250 is configured as follows: first, when the laser projector starts working, the machine noise signal at a first gear value is obtained, and then the initial noise signal corresponding to the first gear value pre-stored from the first relationship data between the gear value and the noise signal is determined; then, based on the machine noise signal at the first gear value, the initial noise signal corresponding to the first gear value is adjusted, and the initial noise signals corresponding to other gear values ​​in the first relationship data are adjusted to obtain the second relationship data between the gear value and the noise signal; further, based on the second relationship data, the sound wave generator is controlled to generate and output the target audio signal to offset the machine noise signals at each gear value.

[0095] In the above embodiment, the controller 250 is specifically configured to: control the sound collector to collect the machine noise signal emitted by the radiator at the first gear value within a preset time length, and the time length of the collected machine noise signal is the preset time length.

[0096] In the above-mentioned embodiment, the machine noise signal of the radiator at the first gear value is collected once each time the laser projection device is turned on. This is because the performance of the radiator will decay as the machine runs longer, and the noise generated will gradually increase, which will cause the first relationship data between the preset gear value and the noise signal to no longer be applicable to various scenarios. Therefore, compared with real-time collection of noise signals, the frequency of collecting noise signals when the machine is turned on in the disclosed embodiment is more appropriate, the data volume is smaller, and it is conducive to rapid noise reduction.

[0097] In some embodiments, the controller 250 adjusts the initial noise signal corresponding to the first gear value based on the machine noise signal at the first gear value, and adjusts the initial noise signals corresponding to other gear values ​​in the first relationship data to obtain the second relationship data between the gear value and the noise signal. The controller 250 is specifically configured as follows: first, the noise difference between the initial noise signal corresponding to the first gear value and the machine noise signal at the first gear value is calculated, and for the first relationship data, the initial noise signal corresponding to the first gear value is replaced with the machine noise signal at the first gear value to update the pre-stored noise according to the actual noise, and then the initial noise signals corresponding to other gear values ​​in the first relationship data are corrected and compensated according to the aforementioned noise difference to obtain the second relationship data.

[0098] In some embodiments, the controller 250 corrects and compensates the initial noise signals corresponding to other gear values ​​according to the noise difference to obtain the second relationship data, and is specifically configured as follows: first, the initial noise signals corresponding to other gear values ​​are determined from the original first relationship data, and then the target noise signals corresponding to other gear values ​​are calculated according to the initial noise signals corresponding to other gear values ​​and the noise difference, and further, for the first relationship data between the gear value and the noise data, the initial noise signals corresponding to the other gear values ​​are replaced with the corresponding target noise signals to obtain the updated second relationship data between the gear value and the noise data.

[0099] In the above embodiment, based on the characteristic that the difference of noise signals between different gear values ​​remains unchanged, when the machine noise signal corresponding to the first gear value is collected, the initial noise signals corresponding to other gear values ​​are corrected and compensated to update the first relationship data between the gear value and the noise signal, so that the radiator does not need to collect noise data in real time during subsequent operation, and can quickly realize reverse sound wave noise reduction according to the updated second relationship data with less data calculation.

[0100] In some embodiments, the laser projector further includes a temperature sensor; the controller 250 is further configured to: when controlling the laser sensor to work, obtain the temperature value collected by the temperature sensor in real time, and determine whether the temperature value is greater than a preset threshold, wherein the preset threshold is a preset temperature threshold for changing the radiator gear value, and when it is determined that the temperature value is greater than the preset threshold, change the working gear value of the radiator. Determine the target noise signal corresponding to other gear values ​​from the second relationship data; generate and output the target audio signal corresponding to other gear values ​​according to the target noise signal to offset the target noise signal under other gear values.

[0101] In the above embodiment, as the gear value of the radiator changes, the corresponding noise also changes. When the correspondence between the gear value and the noise signal is updated based on the characteristic that the difference of the noise signal between different gear values ​​remains unchanged, the target noise signal corresponding to the gear value can be quickly found when the radiator is at a certain gear value, and then the target audio signal can be generated according to the target noise signal to eliminate the noise data corresponding to the gear value.

[0102] like Figure 7 As shown, Figure 7 A software configuration diagram of the laser projection device 200 provided in an embodiment of the present disclosure is shown in FIG. Figure 7 As shown, the system is divided into four layers, from top to bottom, namely, the application layer (Applications) (referred to as "application layer"), the application framework layer (Application Framework) (referred to as "framework layer"), the Android runtime (Android runtime) and the system library layer (referred to as "system runtime layer"), and the kernel layer. The kernel layer includes at least one of the following drivers: audio driver, display driver, Bluetooth driver, camera driver, WIFI driver, USB driver, HDMI driver, sensor driver (such as fingerprint sensor, temperature sensor, pressure sensor, etc.), and power driver, etc. The noise reduction method of the laser projection device provided in the embodiment of the present disclosure can be implemented based on the above-mentioned laser projection device 200.

[0103] In order to explain this scheme in more detail, the following will be combined in an exemplary manner Figure 8 To explain, it is understandable that Figure 8 The steps involved may include more steps or fewer steps in actual implementation, and the order of these steps may also be different, so as to implement the noise reduction method of the laser projection device provided in the embodiment of the present disclosure.

[0104] like Figure 8 As shown, Figure 8 This is a flow chart of a noise reduction method for a laser projection device provided in an embodiment of the present disclosure, the method comprising the following steps S801-S802:

[0105] S801. When the laser projection device is working, the sound wave generator is controlled to generate and output an initial audio signal.

[0106] The initial audio signal is used to offset the pre-stored initial noise signal; the initial audio signal and the initial noise signal have opposite phases.

[0107] S802: When the laser projector starts to work, a machine noise signal is obtained, an initial audio signal is adjusted based on the machine noise signal, and a sound wave generator is controlled to generate and output a target audio signal.

[0108] The target audio signal is the adjusted initial audio signal, which is used to offset the machine noise signal. The target audio signal and the machine noise signal have opposite phases.

[0109] The disclosed embodiment generates and outputs an initial audio signal according to a pre-stored initial noise signal to perform noise reduction when the laser projector is working, and obtains an actual machine noise signal when the laser projector just starts working, so as to adjust the initial audio signal according to the machine noise signal and adapt to changes in the noise signal. During the subsequent continuous operation of the laser projection device, a target audio signal capable of offsetting the machine noise signal is generated and output. There is no need to continuously collect machine noise signals during the operation, the amount of computation is small, and the system can effectively adapt to changes in actual noise for precise noise reduction, thereby improving the noise reduction effect of the laser projection device.

[0110] In some embodiments, the above step S801 is that the laser projection device controls the sound wave generator to generate and output the initial audio signal corresponding to each gear value according to the pre-stored first relationship data between the gear value and the noise signal.

[0111] The first relationship data between the gear value of the radiator and the noise signal is pre-stored, and the first relationship data between the gear value and the noise signal can be stored in a table form, and the present disclosure does not limit the storage form of the first relationship data. Specifically, the first relationship data can be obtained by controlling the radiator to work at different gear values, collecting noise signals at different gear values ​​through a sound collector, and storing them accordingly.

[0112] Exemplarily, the first relationship data between the preset gear value and the noise signal is shown in Table 1:

[0113] Table 1

[0114] Gear value Noise signal / unit: Hertz (Hz) 1st gear Na 2nd gear Nb 3rd gear Nc …… ……

[0115] It should be noted that the difference of the noise signal between different gears remains unchanged, as shown in Table 1, Nb-Na=Nc-Nb. The present disclosure does not specifically limit the number of gear values.

[0116] As shown in Table 1, the first relationship data may be preset in the device storage space when the laser projection device leaves the factory. In the disclosed embodiment, the first relationship data supports adjustment and update, and the laser projection device will collect the actual machine noise signal to adjust the first relationship data each time it is turned on. When the laser projection device is turned on this time, the first relationship data may be the relationship data adjusted and stored after the last startup.

[0117] refer to Fig. 9 As shown, Fig. 9A schematic diagram of the noise reduction principle provided by an embodiment of the present disclosure, the laser projection device will be as follows Fig. 9 The initial noise signal (sound wave signal) shown in (a) is converted into a data signal and transmitted to the algorithm processor, which calculates the data signal and obtains the following: Fig. 9 The initial audio signal shown in (b) is then sent to the sound wave generator, so that the sound wave generator outputs the initial audio signal to cover the viewing area. Fig. 9 As shown in (c), the initial audio signal and the initial noise signal are in opposite phases and can cancel each other out, thereby achieving a machine noise-free effect in the viewing area of ​​the laser projection device.

[0118] In some embodiments, the above step S802 may include the following steps: first, when the laser projector starts working, obtain the machine noise signal at the first gear value, and then determine the initial noise signal corresponding to the first gear value from the first relationship data between the pre-stored gear value and the noise signal; then, based on the machine noise signal at the first gear value, adjust the initial noise signal corresponding to the first gear value, and adjust the initial noise signals corresponding to other gear values ​​in the first relationship data to obtain the second relationship data between the gear value and the noise signal; further, according to the second relationship data, control the sound wave generator to generate and output the target audio signal to offset the machine noise signals at each gear value.

[0119] The present disclosure provides an optional implementation method, when controlling the laser projector to start working, controlling the sound collector to collect the machine noise signal emitted by the radiator at the first gear value. The sound collector includes but is not limited to a pickup microphone, according to Figure 2 or Figure 4 The first gear value is a low gear value for the radiator, such as 1st gear.

[0120] The laser projection device is turned on, and the laser projector is controlled to start working for projection. At the same time, the radiator, the sound collector, and the sound wave generator are started. At this time, the radiator is started at the first gear value.

[0121] In some embodiments, when the laser projector starts working, obtaining the machine noise signal at the first gear value includes: controlling the sound collector to collect the machine noise signal emitted by the radiator at the first gear value within a preset time length, and the time length of the collected machine noise signal is the preset time length. Exemplarily, the sound collector is started to work for 30 seconds, and the machine noise data with a length of 30 seconds is collected.

[0122] In the above-mentioned embodiment, the machine noise signal of the radiator at the first gear value is collected once each time the laser projection device is turned on. This is because the performance of the radiator will decay as the machine runs longer, and the noise generated will gradually increase, which will cause the first relationship data between the preset gear value and the noise signal to no longer be applicable to various scenarios. Therefore, compared with real-time collection of noise signals, the frequency of collecting noise signals when the machine is turned on in the disclosed embodiment is more appropriate, the data volume is smaller, and it is conducive to rapid noise reduction.

[0123] In some embodiments, after the actual machine noise signal at the first gear value is obtained during the startup operation, the initial noise signal corresponding to the pre-stored first gear value is determined from the pre-stored first relationship data between the gear value and the signal, including: determining the initial noise signal corresponding to the first gear value from the first relationship data preset at the factory. It can be understood that this startup operation is the first startup of the laser projection device after leaving the factory, and the initial noise signal corresponding to the first gear value may be the noise signal of the lowest gear value measured in the experimental environment; or, determining the initial noise signal corresponding to the first gear value from the first relationship data stored last time. It can be understood that the laser projection device has been started up for many times, and each startup operation will collect the actual noise signal emitted by the radiator at that time, and update and adjust the first relationship data according to the actual noise signal. The noise signals corresponding to each gear value are not static, and will change with the aging of the equipment and other conditions.

[0124] In some embodiments, after determining the machine noise signal at the first gear value, in the process of adjusting the initial noise signal corresponding to the first gear value based on the machine noise signal at the first gear value, and adjusting the initial noise signals corresponding to other gear values ​​to obtain the second relationship data between the gear value and the noise signal, the noise difference between the initial noise signal corresponding to the first gear value and the machine noise signal at the first gear value is first calculated, and for the first relationship data, the initial noise signal corresponding to the first gear value is replaced with the machine noise signal at the first gear value, so as to update the pre-stored noise according to the actual noise, and then the initial noise signals corresponding to other gear values ​​in the first relationship data are corrected and compensated according to the aforementioned noise difference to obtain the second relationship data.

[0125] Exemplarily, assuming that the machine noise data actually emitted by the radiator under the first gear value collected is Na`, based on the first relationship data between the preset gear value and the noise data shown in Table 1 above, the initial noise signal corresponding to the first gear value is Na, and the noise difference between the initial noise signal Na and the machine noise data Na` is calculated to obtain the noise difference ΔN=Na`-Na, and then the initial noise signal Na corresponding to the first gear value in the first relationship data is replaced with the machine noise signal Na` under the first gear value, and then according to the noise difference ΔN, the initial noise signal Nb corresponding to the 2nd gear and the initial noise signal Nc corresponding to the 3rd gear are corrected and compensated to obtain the updated second relationship data between the gear value and the noise signal.

[0126] In the above embodiment, in the process of correcting and compensating the initial noise signals corresponding to other gear values ​​according to the noise difference to obtain the second relationship data between the gear value and the noise data, the present disclosure provides an optional implementation method, firstly determining the initial noise signals corresponding to the other gear values ​​from the original first relationship data, and then calculating the target noise signals corresponding to the other gear values ​​according to the initial noise signals corresponding to the other gear values ​​and the noise difference, and further, for the first relationship data between the gear value and the noise data, replacing the initial noise signals corresponding to the other gear values ​​with the corresponding target noise signals, to obtain the updated second relationship data between the gear value and the noise data.

[0127] Exemplarily, following the above example, based on the first relationship data between the gear value and the noise signal shown in Table 1, the initial noise signal Nb corresponding to the 2nd gear and the initial noise signal Nc corresponding to the 3rd gear are determined, and then the target noise signal Nb`=Nb+ΔN corresponding to the 2nd gear is calculated according to the noise difference ΔN and the initial noise signal Nb corresponding to the 2nd gear, and the target noise signal Nc`=Nc+ΔN corresponding to the 3rd gear is calculated according to the noise difference ΔN and the initial noise signal Nc corresponding to the 3rd gear. Further, the initial noise signal Nb corresponding to the 2nd gear in Table 1 is replaced by the target noise signal Nb` corresponding to the 2nd gear, and the initial noise signal Nc corresponding to the 3rd gear is replaced by the target noise signal Nc` corresponding to the 3rd gear, so as to obtain the updated second relationship data between the gear value and the noise signal as shown in Table 2:

[0128] Table 2

[0129] Gear value Noise signal / unit: Hertz (Hz) 1st gear Na` 2nd gear Nb` 3rd gear Nc` …… ……

[0130] In the above embodiment, based on the characteristic that the difference of noise signals between different gear values ​​remains unchanged, when the machine noise signal corresponding to the first gear value is collected, the initial noise signals corresponding to other gear values ​​are corrected and compensated to update the first relationship data between the gear value and the noise signal, so that the radiator does not need to collect noise data in real time during subsequent operation, and can quickly realize reverse sound wave noise reduction according to the updated second relationship data with less data calculation.

[0131] In some embodiments, the radiator may be a cooling fan, and the cooling fan does not work at a rated speed. When the ambient temperature rises, the cooling fan speed needs to be increased. The laser projection device for implementing the noise reduction method disclosed herein also includes a temperature sensor. When controlling the laser sensor to work, the controller of the laser projection device obtains a temperature value collected in real time by the temperature sensor, and determines whether the temperature value is greater than a preset threshold, wherein the preset threshold is a temperature threshold pre-set for changing the gear value of the radiator, and there may be multiple such values, for example, 2 gears correspond to a first preset threshold, and 3 gears correspond to a second preset threshold, wherein the second preset threshold is greater than the first preset threshold.

[0132] When it is determined that the temperature value is greater than the preset threshold, the working gear value of the radiator is changed. For example, when the temperature value is greater than the first preset threshold, the first gear value (1st gear) is changed to 2nd gear, and when the temperature value is greater than the second preset threshold, the gear is changed from 2nd gear to 3rd gear.

[0133] In some embodiments, step S802 requires a certain amount of time to adjust the gear value according to the machine noise signal and the first relationship data of the noise signal, which is recorded as the data correction compensation time, usually 30 seconds; and the process of outputting the corresponding audio signal for noise reduction at a certain gear value also requires a certain amount of time, which is recorded as the noise reduction time, usually 30 seconds; this results in the radiator gear change also requiring a certain amount of change time, and the change time needs to be greater than the total duration of the noise acquisition time, the data correction compensation time and the noise reduction time. For example, it takes 90 seconds to change from the initial gear value (1 gear) to 2 gear, thereby avoiding the adverse effects of frequent automatic gear changes on noise reduction and giving the laser projection equipment sufficient noise reduction time.

[0134] In the above embodiment, as the gear value of the radiator changes, the corresponding noise also changes. After executing step S802, the present disclosure has updated the correspondence between the gear value and the noise signal based on the characteristic that the difference of the noise signal between different gear values ​​remains unchanged. Therefore, when the radiator is at a certain gear value, the target noise signal corresponding to the gear value can be quickly found, and then the target audio signal can be generated according to the target noise signal to eliminate the noise data corresponding to the gear value.

[0135] In summary, the embodiment of the present disclosure provides a noise reduction method for a laser projection device. The method collects a machine noise signal corresponding to the first gear value each time the laser projection device is turned on and the radiator is in the first gear, so as to adapt to the change of the initial noise data corresponding to the initial gear value caused by reasons such as machine aging, and to adapt to the noise change, a target audio signal is generated according to the collected machine noise signal to offset the machine noise signal corresponding to the first gear value; and the present disclosure takes into account that reasons such as machine aging also affect the noise signals corresponding to other gear values, which leads to poor effect of reverse sound wave noise reduction based on the first relationship data of the preset gear value and the noise signal, so as to update the first relationship data of the gear value and the noise signal based on the collected machine noise data under the first gear value, and based on the characteristic that the difference of the noise signal between different gear values ​​remains unchanged, the updated second relationship data can effectively reduce noise, and when the gear changes, the target noise signal corresponding to the working gear value is found from the second relationship data, and then the target audio signal is generated to output to achieve reverse sound wave noise reduction. It can adapt to noise changes and has a good noise reduction effect.

[0136] like Fig.10 As shown, Fig.10 A schematic diagram of the structure of an electronic device provided in an embodiment of the present disclosure, the electronic device includes a processor 1001, a memory 1002, and a computer program stored in the memory 1002 and executable on the processor 1001, and the computer program, when executed by the processor 1001, implements a noise reduction method for a laser projection device as performed by the above-mentioned laser projection device.

[0137] The embodiment of the present disclosure provides a computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, the various processes of the noise reduction method of the above-mentioned laser projection device are implemented, and the same technical effect can be achieved. To avoid repetition, it will not be repeated here.

[0138] The computer readable storage medium may be a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, etc.

[0139] The present disclosure provides a computer program product, which includes a computer program. When the computer program is run on a computer, the computer is enabled to implement the above-mentioned reverse sound wave noise reduction method.

[0140] For the convenience of explanation, the above description has been made in conjunction with specific embodiments. However, the above discussion in some embodiments is not intended to be exhaustive or limit the embodiments to the specific forms disclosed above. According to the above teachings, various modifications and variations can be obtained. The selection and description of the above embodiments are to better explain the principles and practical applications, so that those skilled in the art can better use the embodiments and various different variations of the embodiments suitable for specific use considerations.

Claims

1. A laser projection device, characterized in that: include: A controller, and a sound wave generator and a laser projector connected to the controller; The controller is configured to: when the laser projector is working, control the sound wave generator to generate and output an initial audio signal, wherein the initial audio signal is used to offset a pre-stored initial noise signal; When the laser projector starts working, a machine noise signal is acquired, the initial audio signal is adjusted based on the machine noise signal, and the sound wave generator is controlled to generate and output a target audio signal; the target audio signal is the adjusted initial audio signal, which is used to offset the machine noise signal.

2. The laser projection device according to claim 1, characterized in that: The controller acquires a machine noise signal when the laser projector starts working, adjusts the initial audio signal based on the machine noise signal, and controls the sound wave generator to generate and output a target audio signal, and is specifically configured as follows: When the laser projection device starts to work, a machine noise signal at a first gear value is obtained; Determining an initial noise signal corresponding to the first stored gear value from pre-stored first relationship data between the gear value and the noise signal; Based on the machine noise signal at the first gear value, adjusting the initial noise signal corresponding to the first gear value, and adjusting the initial noise signals corresponding to other gear values ​​in the first relationship data, to obtain second relationship data between the gear value and the noise signal; According to the second relationship data, the sound wave generator is controlled to generate and output the target audio signal to offset the machine noise signal at each gear value.

3. The laser projection device according to claim 2, characterized in that: The controller adjusts the initial noise signal corresponding to the first gear value based on the machine noise signal at the first gear value, and adjusts the initial noise signals corresponding to other gear values ​​in the first relationship data to obtain the second relationship data between the gear value and the noise signal, and is specifically configured as follows: For the first relationship data, calculating a noise difference between an initial noise signal corresponding to the first gear value and a machine noise signal at the first gear value; replacing an initial noise signal corresponding to the first gear value with a machine noise signal at the first gear value; According to the noise difference, the initial noise signals corresponding to the other gear values ​​are corrected and compensated to obtain the second relationship data.

4. The laser projection device according to claim 3, characterized in that: The controller, according to the noise difference, performs correction and compensation on the initial noise signal corresponding to the other gear value to obtain the second relationship data, is specifically configured as follows: Determining, from the first relationship data, initial noise signals corresponding to the other gear values; Calculating a target noise signal corresponding to the other gear value according to the initial noise signal corresponding to the other gear value and the noise difference; With respect to the first relationship data, the initial noise signals corresponding to the other gear values ​​are replaced with corresponding target noise signals to obtain the second relationship data.

5. The laser projection device according to claim 4, characterized in that: The laser projector also includes a temperature sensor; The controller is further configured to: when the laser projector is working, obtain the device temperature value collected by the temperature sensor; When the device temperature value is greater than or equal to a preset threshold, changing from the first gear value to other gear values; Determining the target noise signal corresponding to the other gear values ​​from the second relationship data; A target audio signal corresponding to the other gear value is generated according to the target noise signal and outputted to offset the target noise signal at the other gear value.

6. A method for reducing noise of a laser projection device, characterized in that: include: When the laser projection device is working, the sound wave generator is controlled to generate and output an initial audio signal, wherein the initial audio signal is used to offset the pre-stored initial noise signal; When the laser projector starts working, a machine noise signal is acquired, the initial audio signal is adjusted based on the machine noise signal, and the sound wave generator is controlled to generate and output a target audio signal; the target audio signal is the adjusted initial audio signal, which is used to offset the machine noise signal.

7. The method according to claim 6, characterized in that The method of acquiring a machine noise signal when the laser projector starts working, adjusting the initial audio signal based on the machine noise signal, and controlling the sound wave generator to generate and output a target audio signal comprises: When the laser projection device starts to work, a machine noise signal at a first gear value is obtained; Determining an initial noise signal corresponding to the first stored gear value from pre-stored first relationship data between the gear value and the noise signal; Based on the machine noise signal at the first gear value, adjusting the initial noise signal corresponding to the first gear value, and adjusting the initial noise signals corresponding to other gear values ​​in the first relationship data, to obtain second relationship data between the gear value and the noise signal; According to the second relationship data, the sound wave generator is controlled to generate and output the target audio signal to offset the machine noise signal at each gear value.

8. The method according to claim 7, characterized in that The method of adjusting the initial noise signal corresponding to the first gear value based on the machine noise signal at the first gear value, and adjusting the initial noise signals corresponding to other gear values ​​in the first relationship data to obtain the second relationship data between the gear value and the noise signal includes: For the first relationship data, calculating a noise difference between an initial noise signal corresponding to the first gear value and a machine noise signal at the first gear value; replacing an initial noise signal corresponding to the first gear value with a machine noise signal at the first gear value; According to the noise difference, the initial noise signals corresponding to the other gear values ​​are corrected and compensated to obtain the second relationship data.

9. The method according to claim 8, characterized in that The step of correcting and compensating the initial noise signals corresponding to the other gear values ​​according to the noise difference to obtain the second relationship data includes: Determining, from the first relationship data, initial noise signals corresponding to the other gear values; Calculating a target noise signal corresponding to the other gear value according to the initial noise signal corresponding to the other gear value and the noise difference; With respect to the first relationship data, the initial noise signals corresponding to the other gear values ​​are replaced with corresponding target noise signals to obtain the second relationship data.

10. The method according to claim 9, characterized in that The method further comprises: When the laser projector starts working, obtaining a device temperature value collected by a temperature sensor; When the device temperature value is greater than or equal to a preset threshold, changing from the first gear value to other gear values; Determining the target noise signal corresponding to the other gear values ​​from the second relationship data; A target audio signal corresponding to the other gear value is generated according to the target noise signal and outputted to offset the target noise signal at the other gear value.

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