Vehicle-mounted microphone system and method for improving microphone sound quality

Abstract

The present invention provides a vehicle-mounted microphone system and a method for improving microphone sound quality. The vehicle-mounted microphone system receives an audio data signal output by the vehicle-mounted microphone via a wireless receiving module and transmits the audio data signal to a buffer module. The buffer module buffers and adjusts the audio data signal and transmits the adjusted audio data signal to a DSP module. The DSP module converts the adjusted audio data signal into a digital interface signal and transmits it to a vehicle controller via a vehicle interface. In the present invention, by buffering and adjusting the audio data signal, the accuracy of the digital interface signal generated from the buffered audio signal is improved, thereby correcting clock jitter generated during transmission and improving the sound quality of the sound captured by the microphone.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicle-mounted microphones, and in particular to a vehicle-mounted microphone system and a method for improving the sound quality of a microphone. Background Art

[0002] With the increasing popularity of cars in China and the growing automotive market, the demand for in-vehicle electronic auxiliary equipment to meet the entertainment needs of drivers and passengers is also increasing. Drivers and passengers' entertainment method is listening to music, and the emergence of in-vehicle microphones has further enhanced the entertainment experience.

[0003] During the microphone audio data collection and transmission process, clock jitter is very likely to occur, which will increase the impact of inter-code crosstalk between signal streams during audio data transmission, causing the transmission bit error rate to increase and the sound quality output through the car player to be very poor.

[0004] The above content is only used to assist in understanding the technical solution of the present invention and does not constitute an admission that the above content is prior art. Summary of the Invention

[0005] The main purpose of the present invention is to provide a vehicle-mounted microphone system and a method for improving the sound quality of the microphone, aiming to solve the technical problem in the prior art that clock jitter is generated during the transmission process, which causes inter-symbol interference and increases the transmission bit error rate.

[0006] To achieve the above object, the present invention provides a vehicle-mounted microphone system, which includes: a wireless receiving module, a buffer module and a DSP module;

[0007] The buffer module is connected to the wireless receiving module and the DSP module respectively, and the DSP module is connected to the vehicle controller via a vehicle interface;

[0008] The wireless receiving module is used to receive the audio data signal output by the vehicle-mounted microphone and send the audio data signal to the buffer module;

[0009] The buffer module is used to perform buffering and adjustment on the audio data signal, and send the adjusted audio data signal obtained after adjustment to the DSP module;

[0010] The DSP module is used to convert the adjusted audio data signal into a digital interface signal and send it to the vehicle controller through the vehicle interface.

[0011] Optionally, the wireless receiving module includes: a preset number of wireless receiving chips;

[0012] Wherein, the wireless receiving chip is respectively connected to the buffer module and the corresponding vehicle-mounted microphone;

[0013] Each of the wireless receiving chips is used to receive the audio data signal output by the corresponding vehicle-mounted microphone and convert the audio data signal into a bus audio signal;

[0014] The wireless receiving chip is further used to send the bus audio signal to the buffer module;

[0015] The buffer module is further used to adjust the bus audio signal to obtain an adjusted audio data signal.

[0016] Optionally, the wireless receiving chip is further configured to output a serial clock signal and a field selection signal to the DSP module;

[0017] The DSP module is further configured to convert the regulated audio data signal into the digital interface signal according to the serial clock signal and the field selection signal.

[0018] Optionally, the vehicle-mounted microphone system further includes: a voltage regulation module;

[0019] The voltage regulation module is respectively connected to the vehicle interface, the DSP module and the wireless receiving chip;

[0020] The voltage regulating module is configured to receive a power supply voltage inputted through the vehicle interface and regulate the power supply voltage to obtain a supply voltage;

[0021] The voltage regulating module is further configured to output the supply voltage to the DSP module and the wireless receiving chip respectively.

[0022] Optionally, the voltage regulation module includes: a filter circuit, a voltage stabilizer and a decoupling circuit;

[0023] The filtering circuit is connected to the vehicle interface and the voltage regulator respectively, and the decoupling circuit is connected to the voltage regulator, the DSP module and the wireless receiving chip respectively;

[0024] The filtering circuit is used to filter the power supply voltage and output the filtered power supply voltage obtained after filtering to the voltage stabilizer;

[0025] The voltage stabilizer is used to stabilize the filtered power supply voltage and output the stabilized power supply voltage obtained after the voltage stabilization to the decoupling circuit;

[0026] The decoupling circuit is used to perform decoupling filtering on the regulated power supply voltage to obtain a decoupled power supply voltage.

[0027] To achieve the above object, the present invention further provides a method for improving the sound quality of a microphone, the method comprising:

[0028] Receive the audio data signal output by the vehicle microphone;

[0029] performing buffering adjustment on the audio data signal to obtain an adjusted audio data signal;

[0030] The adjusted audio data signal is converted into a digital interface signal, and the digital interface signal is sent to a vehicle controller through the vehicle interface.

[0031] Optionally, after the step of receiving the audio data signal output by the vehicle-mounted microphone, the method further includes:

[0032] Converting the audio data signal into a bus audio signal;

[0033] Accordingly, the step of performing buffering adjustment on the audio data signal to obtain an adjusted audio data signal includes:

[0034] The bus audio signal is buffered and regulated to obtain an regulated audio data signal.

[0035] Optionally, the step of converting the adjusted audio data signal into a digital interface signal and sending the digital interface signal to the vehicle controller through the vehicle interface includes:

[0036] Get serial clock signal and field selection signal;

[0037] The regulated audio data signal is converted into the digital interface signal according to the serial clock signal and the field selection signal, and the digital interface signal is sent to the vehicle controller through the vehicle interface.

[0038] Optionally, before the step of receiving the audio data signal output by the vehicle-mounted microphone, the method further includes:

[0039] receiving a power supply voltage input through the vehicle interface and adjusting the power supply voltage to obtain a supply voltage;

[0040] The power supply voltage is output to the DSP module and the wireless receiving chip respectively.

[0041] Optionally, the step of receiving a power supply voltage input through the vehicle interface and adjusting the power supply voltage to obtain the supply voltage includes:

[0042] filtering the power supply voltage to obtain a filtered power supply voltage;

[0043] stabilizing the filtered power supply voltage to obtain a stabilized power supply voltage;

[0044] Decoupling filtering is performed on the regulated power supply voltage to obtain a decoupled power supply voltage.

[0045] The present invention provides a vehicle-mounted microphone system and a method for improving microphone sound quality. The vehicle-mounted microphone system includes: a wireless receiving module, a buffer module, and a DSP module; the buffer module is respectively connected to the wireless receiving module and the DSP module, and the DSP module is connected to a vehicle controller via a vehicle interface; the wireless receiving module receives an audio data signal output by the vehicle-mounted microphone and sends the audio data signal to the buffer module; the buffer module buffers and adjusts the audio data signal and sends the adjusted audio data signal obtained after adjustment to the DSP module; the DSP module converts the adjusted audio data signal into a digital interface signal and sends it to the vehicle controller via the vehicle interface. In the present invention, by buffering and adjusting the audio data signal, the accuracy of the digital interface signal generated based on the buffered audio signal is improved, thereby correcting clock jitter generated during transmission and improving the sound quality of the sound collected by the microphone. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0047] Figure 1 This is a schematic structural diagram of a first embodiment of the vehicle-mounted microphone system proposed by the present invention;

[0048] Figure 2 Schematic diagram of the waveform of the clock signal and the analog signal;

[0049] Figure 3 This is a schematic structural diagram of a second embodiment of the vehicle-mounted microphone system proposed by the present invention;

[0050] Figure 4 This is a flow chart of a first embodiment of the method for improving microphone sound quality proposed by the present invention;

[0051] Figure 5 This is a flow chart of a second embodiment of the method for improving microphone sound quality proposed by the present invention.

[0052] Description of Figure Numbers:

[0053]

[0054] The purpose, features and advantages of the present invention will be further described with reference to the accompanying drawings and in conjunction with the embodiments. DETAILED DESCRIPTION

[0055] It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0056] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0057] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0058] In addition, the descriptions of "first", "second", etc. in the present invention are for descriptive purposes only and should not be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of such features. In addition, the technical solutions between the various embodiments can be combined with each other, but this must be based on the fact that they can be implemented by ordinary technicians in this field. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0059] Reference Figure 1 , Figure 1 This is a structural diagram of the first embodiment of the vehicle-mounted microphone system proposed by the present invention. Figure 1 A first embodiment of the vehicle-mounted microphone system of the present invention is provided.

[0060] In this embodiment, the vehicle-mounted microphone system includes: a wireless receiving module 10, a buffer module 20 and a DSP module 30;

[0061] The buffer module 20 is connected to the wireless receiving module 10 and the DSP module 30 respectively, and the DSP module 30 is connected to the vehicle controller through a vehicle interface.

[0062] It should be understood that the vehicle microphone system can output analog audio signals through the vehicle audio system. Figure 2During audio signal generation, the rising edges of the jittered clock signal Clock2 and the standard clock signal Clock1 differ. This directly causes a certain deviation in the generated analog signal, thus affecting the sound quality of the player. Clock jitter is a phenomenon in which the actual clock edge, relative to the ideal clock edge, sometimes advances and sometimes lags, and does not accumulate over time. During audio data playback, the digital audio signal must be converted into an analog signal for playback through speakers. In the presence of clock jitter, the analog signal generated during the conversion process will be distorted, thus affecting the sound quality of the played audio signal.

[0063] It should be noted that the vehicle-mounted microphone can be a wireless microphone. This wireless microphone can collect the voice information of the driver and passengers and convert it into corresponding audio data signals. The wireless receiving module 10 is connected to the vehicle-mounted wireless microphone via a wireless radio frequency signal. The wireless receiving module 10 can receive the audio signal output by the wireless microphone. The buffer module 20 is a module used to buffer signal changes. During signal changes, excessive signal fluctuations within a short period of time may affect signal recognition and analysis. The buffer module 20 can reduce the signal fluctuations within a short period of time, thereby reducing the adverse effects caused by signal amplitude fluctuations. The buffer module 20 can be composed of a chip model 74lvc1g157gv and related peripheral circuits. The 74lvc1g157gv chip includes a buffer that can smooth the changes in the audio data signal. The DSP module 30 can be connected to the vehicle controller, which controls the vehicle audio system or player to play the audio data. Of course, the DSP module 30 can convert the audio signal into a signal that can be received by the vehicle controller, thereby controlling the player or audio system to play the audio data. The vehicle interface can be an in-vehicle USB interface.

[0064] In a specific implementation, the wireless receiving module 10 can receive the audio data signal output by the vehicle-mounted microphone and send the audio data signal to the buffer module 20; when receiving the audio data signal, the buffer module 20 buffers and adjusts the audio data signal, and sends the adjusted audio data signal to the DSP module 30; the DSP module 30 can use the relevant serial clock signal and field selection signal to convert the adjusted audio data signal into a digital interface signal, and send it to the vehicle controller through the vehicle interface.

[0065] The audio data signal is the electrical signal generated by the vehicle microphone after converting the received sound. Adjusting the audio data signal is the process of buffering and adjusting the amplitude of the audio data signal through the buffer module 20. The digital interface signal is the signal that the vehicle controller can directly receive and control the playback of the audio system or player.

[0066] In this embodiment, a vehicle-mounted microphone system is provided, comprising: a wireless receiving module, a buffer module, and a DSP module; the buffer module is connected to the wireless receiving module and the DSP module, respectively, and the DSP module is connected to a vehicle controller via a vehicle interface; the wireless receiving module receives an audio data signal output by the vehicle-mounted microphone and sends the audio data signal to the buffer module; the buffer module buffers and adjusts the audio data signal and sends the adjusted audio data signal to the DSP module; the DSP module converts the adjusted audio data signal into a digital interface signal and sends it to the vehicle controller via the vehicle interface. In this embodiment, by buffering and adjusting the audio data signal, the accuracy of the digital interface signal generated from the buffered audio signal is improved, thereby correcting clock jitter generated during transmission and improving the sound quality of the sound collected by the microphone.

[0067] Reference Figure 3 , Figure 3 This is a structural diagram of the second embodiment of the vehicle-mounted microphone system proposed by the present invention. Based on the first embodiment of the vehicle-mounted microphone system, the second embodiment of the vehicle-mounted microphone system of the present invention is proposed.

[0068] In this embodiment, the wireless receiving module 10 includes: a preset number of wireless receiving chips U1;

[0069] The wireless receiving chip U1 is connected to the buffer module 20 and the corresponding vehicle-mounted microphone respectively.

[0070] It should be understood that the wireless receiving chip U1 can be a KT0656 series UHF band wireless receiving chip connected to the RF antenna. All wireless receiving chips U1 can be connected to a common RF line. The preset number refers to the pre-set number of wireless receiving chips U1. The number of wireless receiving chips U1 is the same as the number of onboard microphones, and the wireless receiving chips U1 correspond one-to-one with the wireless microphones. In this embodiment, the onboard microphone system can be equipped with two wireless receiving chips U1 and two onboard microphones.

[0071] In a specific implementation, each of the wireless receiving chips U1 can receive the audio data signal output by its corresponding vehicle-mounted microphone and convert the audio data signal into a bus audio signal; then the bus audio signal is sent to the buffer module 20; the buffer module 20 can also buffer and adjust the bus audio signal to obtain an adjusted audio data signal.

[0072] The bus audio signal is an audio signal that can be directly transmitted via the built-in audio bus of the integrated circuit. The bus audio signal can be a digital signal.

[0073] In this embodiment, by setting a preset number of wireless receiving chips, the audio data signals collected by the corresponding number of wireless microphones can be received, which further improves the experience of the driver and passengers when there are many passengers in the car.

[0074] In this embodiment, the DSP module 30 requires a serial clock signal and a field selection signal in the process of converting the regulated audio signal. The serial clock signal is a clock signal that encodes the data signal. Each bit of audio data corresponds to a serial clock signal. The field selection signal is also called a channel selection signal, which is a signal used to switch the left and right channel data. A field selection signal of "1" indicates that the left channel data is being transmitted, and a field selection signal of "0" indicates that the right channel data is being transmitted. The serial clock signal and the field selection signal can be generated by the wireless receiving chip U1 and then sent to the DSP module 30.

[0075] Therefore, in this embodiment, the wireless receiving chip U1 can output a serial clock signal and a field selection signal to the DSP module 30 while outputting the audio data signal to the buffer module 20; the DSP module 30 can convert the received adjusted audio data signal into the digital interface signal according to the serial clock signal and the field selection signal.

[0076] In this embodiment, the vehicle-mounted microphone system further includes: a voltage regulating module 40;

[0077] The voltage regulating module 40 is connected to the vehicle interface, the DSP module 30 and the wireless receiving chip U1 respectively.

[0078] It should be understood that the wireless receiving chip U1 and the DSP module 30 in the vehicle microphone system both need to be powered by the vehicle interface. During the power supply process, the power supply voltage input through the vehicle interface may have certain ripple voltages, noise interference, and other factors that cause the power supply voltage to be unstable. Directly inputting the power supply voltage to the wireless receiving chip U1 or the DSP module 30 may affect the signal conversion process of the wireless receiving chip U1 and the DSP module 30. The voltage regulation module 40 can be used to regulate the power supply voltage to obtain a standard power supply voltage to power the wireless receiving chip U1 and the DSP module 30.

[0079] In a specific implementation, the voltage regulation module 40 can receive the power supply voltage input through the vehicle interface, regulate the power supply voltage to obtain a standard power supply voltage, and then output the power supply voltage to the DSP module 30 and the wireless receiving chip U1 for power supply.

[0080] In this embodiment, the voltage regulation module 40 includes: a filter circuit 401, a voltage stabilizer 402 and a decoupling circuit 403;

[0081] The filtering circuit 401 is connected to the vehicle interface and the voltage regulator 402 respectively, and the decoupling circuit 403 is connected to the voltage regulator 402, the DSP module 30 and the wireless receiving chip U1 respectively.

[0082] It should be understood that interference factors of the power supply voltage output through the vehicle interface mainly include voltage ripple, voltage fluctuation, noise, different voltage coupling, etc. Therefore, in this embodiment, multiple adjustment circuits can be selected to adjust different influence factors respectively, so as to obtain a more standardized power supply voltage.

[0083] It should be noted that the filter circuit 401 can be an LC filter circuit composed of components such as inductors and capacitors. The filter circuit 401 can filter out the effects of factors such as noise and voltage ripple on the power supply voltage. The voltage stabilizer 402 can be a device composed of a voltage regulating circuit, a control circuit, and a servo motor to stabilize the output voltage. When the input voltage or load changes, the control circuit samples, compares, and amplifies, and then drives the servo motor to rotate, causing the position of the voltage regulator carbon brush to change, and by automatically adjusting the coil turns ratio, the output voltage is maintained stable. In addition, some alternating current may be coupled into the power supply voltage, and the coupling circuit 403 can filter out the coupled alternating current. The coupling circuit 403 can be a coupling circuit composed of a membrane capacitor or a bile electrolytic capacitor.

[0084] In a specific implementation, the filtering circuit 401 can filter the power supply voltage and output the filtered power supply voltage obtained after filtering to the voltage regulator 402; the voltage regulator 402 can stabilize the filtered power supply voltage and output the stabilized power supply voltage obtained after stabilization to the decoupling circuit 403; the decoupling circuit 403 can perform decoupling filtering on the stabilized power supply voltage, and output the decoupling power supply voltage obtained after decoupling filtering to the DSP module 30 and the wireless receiving chip U1 respectively.

[0085] In addition, conventional car wireless microphones typically use analog signal transmission, which is susceptible to power supply interference, resulting in low signal-to-noise ratio and high distortion, and thus poor sound quality. Therefore, in this embodiment, data transmission can be performed directly using digital signals to reduce power supply interference.

[0086] In this embodiment, the noise, voltage ripple and other factors in the power supply voltage can be adjusted through the setting of the voltage regulation module 40, thereby reducing the impact of the power supply voltage on the DSP module 30 and the wireless receiving chip U1, further reducing the coupled power supply ripple interference, improving the signal-to-noise ratio and reducing the distortion, making the sound cleaner and more transparent.

[0087] In addition, to achieve the above purpose, refer to Figure 4 The present invention also provides a method for improving microphone sound quality based on the vehicle-mounted microphone system, the method for improving microphone sound quality comprising:

[0088] Step S10: receiving an audio data signal output by a vehicle-mounted microphone;

[0089] Step S20: performing buffering adjustment on the audio data signal to obtain an adjusted audio data signal;

[0090] Step S30: converting the adjusted audio data signal into a digital interface signal, and sending the digital interface signal to the vehicle controller through the vehicle interface.

[0091] It can be understood that the execution subject of this embodiment can be the above-mentioned vehicle-mounted microphone system, in which each module of the vehicle-mounted microphone system can perform its corresponding function.

[0092] It should be understood that the in-vehicle microphone system can output analog audio signals through the in-vehicle audio system. During the audio signal generation process, clock jitter can directly cause deviations in the generated analog signal, thereby affecting the sound quality of the audio player. Clock jitter is a phenomenon in which the actual clock edge, relative to the ideal clock, sometimes advances and sometimes lags, and does not accumulate over time. During the audio data signal playback process, the digital audio signal must be converted into an analog audio signal for playback through the audio system. In the presence of clock jitter, the audio signal conversion process can cause distortion in the generated analog signal, thereby affecting the sound quality of the played audio signal.

[0093] It should be noted that the vehicle-mounted microphone can be a wireless microphone. This wireless microphone can collect the voice information of the driver and passengers and convert it into corresponding audio data signals. The wireless receiving module is connected to the vehicle-mounted wireless microphone via a wireless radio frequency signal. The wireless receiving module can receive the audio signal output by the wireless microphone. The buffer module is used to buffer signal changes. During signal changes, excessive signal fluctuations within a short period of time may affect signal recognition and analysis. The buffer module can reduce the signal fluctuations within a short period of time, thereby reducing the adverse effects caused by signal amplitude fluctuations. The buffer module can be a module consisting of a chip model 74lvc1g157gv and related peripheral circuits. The DSP module can be connected to the vehicle controller, and the vehicle controller can control the playback of audio data by the vehicle audio system or player. Of course, the DSP module can convert the audio signal into a signal that can be received by the vehicle controller, thereby controlling the playback of the player or audio system through the vehicle controller.

[0094] In a specific implementation, the wireless receiving module can receive the audio data signal output by the vehicle-mounted microphone and send the audio data signal to the buffer module; when receiving the audio data signal, the buffer module buffers and adjusts the audio data signal, and sends the adjusted audio data signal to the DSP module; the DSP module can use the relevant serial clock signal and field selection signal to convert the adjusted audio data signal into a digital interface signal, and send it to the vehicle controller through the vehicle interface.

[0095] The audio data signal is the electrical signal generated by the vehicle's microphone after converting the received sound. The conditioned audio data signal is the signal obtained by buffering and adjusting the amplitude of the audio data signal through the buffer module. The digital interface signal is the signal that the vehicle controller can directly receive and control the playback of the audio system or player.

[0096] This embodiment provides a method for improving microphone sound quality. The method receives an audio data signal output by a vehicle-mounted microphone via a wireless receiving module and transmits the audio data signal to a buffer module. The buffer module buffers and adjusts the audio data signal and transmits the resulting adjusted audio data signal to a DSP module. The DSP module converts the adjusted audio data signal into a digital interface signal and transmits it to a vehicle controller via a vehicle interface. In this embodiment, buffering and adjusting the audio data signal improves the accuracy of the digital interface signal generated from the buffered audio signal, thereby correcting for clock jitter generated during transmission and improving the sound quality of the sound captured by the microphone.

[0097] Reference Figure 5 , Figure 5 Therefore, based on the first embodiment of the method for improving the sound quality of a microphone, a second embodiment of the method for improving the sound quality of a microphone of the present invention is proposed.

[0098] In this embodiment, after step S10, the following steps are further included:

[0099] Step S201: converting the audio data signal into a bus audio signal;

[0100] Correspondingly, the step S20 is as follows: Step S20': performing buffering adjustment on the bus audio signal to obtain an adjusted audio data signal.

[0101] It should be understood that the wireless receiving chip can be a KT0656 series UHF band wireless receiving chip connected to the RF antenna. All wireless receiving chips can be connected to a common RF line. The preset number refers to the pre-set number of wireless receiving chips. The number of wireless receiving chips is the same as the number of onboard microphones, and the wireless receiving chips correspond one-to-one with the wireless microphones. In this embodiment, the onboard microphone system can be equipped with two wireless receiving chips and two onboard microphones.

[0102] In a specific implementation, each of the wireless receiving chips can receive the audio data signal output by its corresponding vehicle-mounted microphone and convert the audio data signal into a bus audio signal; then the bus audio signal is sent to the buffer module; the buffer module can also buffer and adjust the bus audio signal to obtain an adjusted audio data signal.

[0103] The bus audio signal is an audio signal that can be directly transmitted via the built-in audio bus of the integrated circuit. The bus audio signal can be a digital signal.

[0104] In this embodiment, by setting a preset number of wireless receiving chips, the audio data signals collected by the corresponding number of wireless microphones can be received, which further improves the experience of the driver and passengers when there are many passengers in the car.

[0105] In this embodiment, step S30 includes:

[0106] Step S301: Acquire a serial clock signal and a field selection signal;

[0107] Step S302: converting the adjusted audio data signal into the digital interface signal according to the serial clock signal and the field selection signal, and sending the digital interface signal to the vehicle controller through the vehicle interface.

[0108] It should be understood that the DSP module requires a serial clock signal and a field select signal to convert the regulated audio signal. The serial clock signal is the clock signal that encodes the data signal. Each bit of audio data corresponds to a serial clock signal. The field select signal, also known as the channel select signal, is used to switch between left and right channel data. A field select signal of "1" indicates that the left channel data is being transmitted, while a field select signal of "0" indicates that the right channel data is being transmitted. The serial clock signal and field select signal can be generated by the wireless receiving chip and then sent to the DSP module.

[0109] In this embodiment, the wireless receiving chip can output a serial clock signal and a field selection signal to the DSP module while outputting the audio data signal to the buffer module; the DSP module can convert the received adjusted audio data signal into the digital interface signal based on the serial clock signal and the field selection signal.

[0110] In addition, in this embodiment, before step S10, the following steps are further included:

[0111] Step S101: receiving a power supply voltage input through the vehicle interface, and adjusting the power supply voltage to obtain a supply voltage.

[0112] Step S102: outputting the supply voltage to the DSP module and the wireless receiving chip respectively.

[0113] It should be understood that the wireless receiving chip and DSP module in the vehicle microphone system both need to be powered by the vehicle interface. During the power supply process, the power supply voltage input through the vehicle interface may have certain ripple voltage, noise interference, and other factors that cause power supply voltage instability. Directly inputting the power supply voltage to the wireless receiving chip or DSP module may affect the signal conversion process of the wireless receiving chip and DSP module. The voltage regulation module can be used to adjust the power supply voltage to obtain a standard supply voltage to power the wireless receiving chip and DSP module.

[0114] In a specific implementation, the voltage regulation module can receive the power supply voltage input through the vehicle interface, regulate the power supply voltage to obtain a standard power supply voltage, and then output the power supply voltage to the DSP module and the wireless receiving chip for power supply.

[0115] The step S101 specifically includes:

[0116] Step S1011: filtering the power supply voltage to obtain a filtered power supply voltage;

[0117] Step S1012: stabilizing the filtered power supply voltage to obtain a stabilized power supply voltage;

[0118] Step S1013: performing decoupling filtering on the regulated power supply voltage to obtain a decoupled power supply voltage.

[0119] It should be understood that interference factors of the power supply voltage output through the vehicle interface mainly include voltage ripple, voltage fluctuation, noise, different voltage coupling, etc. Therefore, in this embodiment, multiple adjustment circuits can be selected to adjust different influence factors respectively, so as to obtain a more standardized power supply voltage.

[0120] It should be noted that the filter circuit can be an LC filter circuit composed of components such as inductors and capacitors. The filter circuit can filter out the effects of factors such as noise and voltage ripple on the power supply voltage. The voltage stabilizer can be a device composed of a voltage regulating circuit, a control circuit, and a servo motor to stabilize the output voltage. When the input voltage or load changes, the control circuit samples, compares, and amplifies, and then drives the servo motor to rotate, causing the position of the voltage regulator carbon brush to change, and by automatically adjusting the coil turns ratio, the output voltage is kept stable. In addition, some alternating current may be coupled into the power supply voltage, and the coupling circuit can filter out the coupled alternating current. The coupling circuit can be a coupling circuit composed of a membrane capacitor or a bile electrolytic capacitor.

[0121] In a specific implementation, the filtering circuit can filter the power supply voltage and output the filtered power supply voltage obtained after filtering to the voltage regulator; the voltage regulator can stabilize the filtered power supply voltage and output the regulated power supply voltage obtained after stabilization to the decoupling circuit; the decoupling circuit can perform decoupling filtering on the regulated power supply voltage to obtain a decoupled power supply voltage.

[0122] In addition, conventional car wireless microphones typically use analog signal transmission, which is susceptible to power supply interference, resulting in low signal-to-noise ratio and high distortion, and thus poor sound quality. Therefore, in this embodiment, data transmission can be performed directly using digital signals to reduce power supply interference.

[0123] In this embodiment, the noise, voltage ripple and other factors in the power supply voltage can be adjusted through the setting of the voltage regulation module, thereby reducing the impact of the power supply voltage on the DSP module and the wireless receiving chip, further reducing the coupled power supply ripple interference, improving the signal-to-noise ratio and reducing the distortion, making the sound cleaner and more transparent.

[0124] The above are only preferred embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention description and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A vehicle-mounted microphone system, characterized in that: The vehicle-mounted microphone system includes: a wireless receiving module, a buffer module and a DSP module; The buffer module is connected to the wireless receiving module and the DSP module respectively, and the DSP module is connected to the vehicle controller via a vehicle interface; The wireless receiving module is used to receive the audio data signal output by the vehicle-mounted microphone and send the audio data signal to the buffer module; The buffer module is used to perform amplitude change buffering adjustment on the audio data signal and send the adjusted audio data signal obtained after adjustment to the DSP module; The DSP module is used to convert the regulated audio data signal into a digital interface signal and send it to the vehicle controller through the vehicle interface; The wireless receiving module includes a preset number of wireless receiving chips; the wireless receiving chips are respectively connected to the buffer module and the corresponding vehicle microphones; The wireless receiving chip is used to output a serial clock signal and a field selection signal to the DSP module; The DSP module is further configured to convert the regulated audio data signal into the digital interface signal according to the serial clock signal and the field selection signal.

2. The vehicle-mounted microphone system according to claim 1, wherein: Each of the wireless receiving chips is further configured to receive the audio data signal output by the corresponding vehicle-mounted microphone and convert the audio data signal into a bus audio signal; The wireless receiving chip is further used to send the bus audio signal to the buffer module; The buffer module is further used to adjust the bus audio signal to obtain an adjusted audio data signal.

3. The vehicle-mounted microphone system according to claim 2, wherein: The vehicle-mounted microphone system further includes: a voltage regulation module; The voltage regulation module is respectively connected to the vehicle interface, the DSP module and the wireless receiving chip; The voltage regulating module is configured to receive a power supply voltage inputted through the vehicle interface and regulate the power supply voltage to obtain a supply voltage; The voltage regulating module is further configured to output the supply voltage to the DSP module and the wireless receiving chip respectively.

4. The vehicle-mounted microphone system according to claim 3, wherein: The voltage regulation module includes: a filter circuit, a voltage stabilizer and a decoupling circuit; The filter circuit is connected to the vehicle interface and the voltage regulator respectively, and the decoupling circuit is connected to the voltage regulator, the DSP module and the wireless receiving chip respectively; the filter circuit is used to filter the power supply voltage and output the filtered power supply voltage obtained after filtering to the voltage regulator; The voltage stabilizer is used to stabilize the filtered power supply voltage and output the stabilized power supply voltage obtained after the voltage stabilization to the decoupling circuit; The decoupling circuit is used to perform decoupling filtering on the regulated power supply voltage to obtain a decoupled power supply voltage.

5. A method for improving microphone sound quality based on the vehicle-mounted microphone system according to any one of claims 1 to 4, characterized in that: The method for improving microphone sound quality comprises: Receive the audio data signal output by the vehicle microphone; performing amplitude change buffering adjustment on the audio data signal to obtain an adjusted audio data signal; converting the regulated audio data signal into a digital interface signal, and sending the digital interface signal to a vehicle controller via the vehicle interface; The step of converting the regulated audio data signal into a digital interface signal and sending the digital interface signal to the vehicle controller through the vehicle interface comprises: Get serial clock signal and field selection signal; The regulated audio data signal is converted into the digital interface signal according to the serial clock signal and the field selection signal, and the digital interface signal is sent to the vehicle controller through the vehicle interface.

6. The method for improving microphone sound quality according to claim 5, wherein: After the step of receiving the audio data signal output by the vehicle-mounted microphone, the method further includes: Converting the audio data signal into a bus audio signal; Accordingly, the step of buffering and adjusting the audio data signal to obtain an adjusted audio data signal includes: The bus audio signal is buffered and regulated to obtain an regulated audio data signal.

7. The method for improving microphone sound quality according to claim 6, wherein: Before the step of receiving the audio data signal output by the vehicle-mounted microphone, the method further includes: receiving a power supply voltage input through the vehicle interface and adjusting the power supply voltage to obtain a supply voltage; The power supply voltage is output to the DSP module and the wireless receiving chip respectively.

8. The method for improving microphone sound quality according to claim 7, wherein: The step of receiving the power supply voltage input through the vehicle interface and adjusting the power supply voltage to obtain the supply voltage includes: filtering the power supply voltage to obtain a filtered power supply voltage; stabilizing the filtered power supply voltage to obtain a stabilized power supply voltage; Decoupling filtering is performed on the regulated power supply voltage to obtain a decoupled power supply voltage.

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