WO2021239044A1 - 一种麦克风系统、控制方法及车辆 - Google Patents

一种麦克风系统、控制方法及车辆 Download PDF

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Publication number
WO2021239044A1
WO2021239044A1 PCT/CN2021/096282 CN2021096282W WO2021239044A1 WO 2021239044 A1 WO2021239044 A1 WO 2021239044A1 CN 2021096282 W CN2021096282 W CN 2021096282W WO 2021239044 A1 WO2021239044 A1 WO 2021239044A1
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WIPO (PCT)
Prior art keywords
signal
microphone
power amplifier
multimedia
noise
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PCT/CN2021/096282
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English (en)
French (fr)
Inventor
王松
姜治昊
冉飞
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长城汽车股份有限公司
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Publication of WO2021239044A1 publication Critical patent/WO2021239044A1/zh

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    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/175—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
    • G10K11/178—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10L—SPEECH ANALYSIS TECHNIQUES OR SPEECH SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING TECHNIQUES; SPEECH OR AUDIO CODING OR DECODING
    • G10L15/00—Speech recognition
    • G10L15/20—Speech recognition techniques specially adapted for robustness in adverse environments, e.g. in noise, of stress induced speech
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10L—SPEECH ANALYSIS TECHNIQUES OR SPEECH SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING TECHNIQUES; SPEECH OR AUDIO CODING OR DECODING
    • G10L15/00—Speech recognition
    • G10L15/22—Procedures used during a speech recognition process, e.g. man-machine dialogue
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K2210/00—Details of active noise control [ANC] covered by G10K11/178 but not provided for in any of its subgroups
    • G10K2210/10—Applications
    • G10K2210/128—Vehicles
    • G10K2210/1282—Automobiles
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10L—SPEECH ANALYSIS TECHNIQUES OR SPEECH SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING TECHNIQUES; SPEECH OR AUDIO CODING OR DECODING
    • G10L15/00—Speech recognition
    • G10L15/22—Procedures used during a speech recognition process, e.g. man-machine dialogue
    • G10L2015/223—Execution procedure of a spoken command

Definitions

  • the present disclosure relates to the field of automobile technology, and in particular to a microphone system, a control method, and a vehicle.
  • One set of microphones is used to locate sound sources in different sound areas, and then multiple channels of audio are alternately combined into one audio signal according to the sampling point and transmitted to the host for voice signal processing; the other set of microphones is used to acquire the noise in the car and send it
  • the noise reduction module of the power amplifier is used for analysis and processing, and the inverse sound wave is generated by the speaker in the car to cancel the engine noise, thereby achieving the noise reduction effect.
  • each seat area is divided into a sound zone; and for active noise reduction and sound field division functions, at least 8 microphones, namely 4 microphones, must be arranged in the car
  • Voice microphone and 4 noise reduction microphones that is, at least one voice microphone and one noise reduction microphone are set in each sound zone, which are used to collect sound signals of different frequencies and send them to the host's voice module and power amplifier's active noise reduction assembly Perform sound analysis processing.
  • Fig. 2 shows a schematic diagram of the wiring harness connection in a traditional way that realizes the noise reduction function through a microphone.
  • voice microphones and noise-reducing microphones collect audio signals in different frequency ranges
  • the traditional way of implementing noise-reduction functions through microphones has strict requirements on the performance of the microphones, which further increases the cost of the entire vehicle.
  • the present disclosure aims to propose a microphone system, a control method, and a vehicle, so as to solve the need to provide a voice microphone and a noise reduction microphone at the same time in order to achieve the function of active noise reduction and sound field division in the car in the prior art.
  • the wiring harness is connected, which is easy to increase the cost and occupy a lot of space in the car.
  • a microphone system including a microphone module, a multimedia host, and a power amplifier, the multimedia host and the power amplifier are both communicatively connected to the microphone module, and the power amplifier is also electrically connected to the speaker module;
  • the microphone module is used to obtain the in-vehicle sound signal, and send the in-vehicle sound signal to the multimedia host and the power amplifier;
  • the multimedia host is used to obtain the voice signal in the voice signal in the vehicle for voice recognition
  • the power amplifier is used to obtain a noise signal in the sound signal in the vehicle, and generate a noise-reduced frequency signal according to the noise signal, and the noise-reduced frequency signal has an opposite phase to the noise signal;
  • the speaker module is used for playing the noise-reducing frequency signal.
  • the multimedia host and the power amplifier are both communicatively connected with the microphone module through a car audio bus.
  • the microphone module includes a plurality of microphones connected in series via a car audio bus, and each of the microphones is correspondingly installed in a target area in the car.
  • each of the microphones has a flat frequency response curve in the frequency range of 20Hz-10KHz.
  • At least one microphone is corresponding to each seat area in the vehicle.
  • the multimedia host is also used to send multimedia audio signals to the power amplifier via the microphone module, so that the power amplifier drives the speaker module to play the multimedia Multimedia audio corresponding to the audio signal.
  • the power amplifier includes:
  • Active noise reduction module used to obtain the noise signal in the sound signal in the vehicle, and generate the noise reduction frequency signal according to the noise signal;
  • the first digital signal processor is configured to generate a total audio signal according to the multimedia audio signal and the noise-reduction frequency signal;
  • the driving module is used to control the speaker module to play audio according to the total audio signal.
  • the power amplifier is also used to forward the total audio signal to the multimedia host via the microphone module;
  • the multimedia host is specifically configured to obtain the voice signal according to the total audio signal and the in-vehicle sound signal.
  • the multimedia host includes:
  • the second digital signal processor is used to obtain the human voice signal in the voice signal in the vehicle;
  • a system on a chip used to determine the voice signal according to the human voice signal and the total audio signal, and when the voice signal is acquired, generate a control instruction, the control instruction is used to pause the multimedia audio , And wake up the voice recognition function.
  • Another object of the present disclosure is to provide a control method, which is applied to a microphone module, and the microphone module is communicatively connected with a multimedia host and a power amplifier; the method includes:
  • the method further includes:
  • the multimedia audio signal sent by the multimedia host is forwarded to the power amplifier, so that the power amplifier drives the speaker module to play the multimedia audio signal.
  • the method further includes:
  • the total audio signal emitted by the power amplifier is forwarded to the multimedia host, so that the multimedia host can determine the voice signal according to the total audio signal and the in-vehicle sound signal.
  • the microphone system and control method described in the present disclosure have the following advantages:
  • Both the multimedia host and the power amplifier are communicatively connected with the microphone module, so that the microphone module can send the in-vehicle sound signal to the multimedia host and the power amplifier based on the above communication connection, and the multimedia host obtains the voice signal in the in-vehicle sound signal, Voice recognition can be realized; the noise signal in the sound signal in the car is obtained by a power amplifier, and the noise signal is generated according to the noise signal for the speaker module to play the noise reduction frequency signal, and then the speaker module plays the noise reduction signal
  • the noise frequency signal can achieve the effect of noise reduction.
  • Another object of the present disclosure is to provide a vehicle, wherein the vehicle includes the microphone system.
  • the vehicle has the same advantages as the aforementioned microphone system over the prior art, and will not be repeated here.
  • Figure 1 is a schematic diagram of the sound field division
  • Figure 2 is a schematic diagram of wiring harness connection in a traditional way to achieve a noise reduction function through a microphone
  • FIG. 3 is a schematic diagram of the structure of the microphone system proposed by the embodiment of the disclosure.
  • FIG. 4 is a schematic diagram of microphone serial connection and signal transmission according to an embodiment of the disclosure.
  • FIG. 5 is a schematic diagram of in-vehicle sound signals collected by a microphone in an embodiment of the disclosure
  • FIG. 6 is a schematic diagram of a transmission path during uplink transmission of audio signals in an embodiment of the disclosure.
  • FIG. 7 is a diagram of a transmission path during uplink transmission of audio signals in an embodiment of the disclosure.
  • FIG. 8 is a graph of the frequency response curve of the microphone in an embodiment of the disclosure.
  • FIG. 9 is a signal processing flowchart of a microphone system provided by an embodiment of the disclosure.
  • FIG. 10 is a schematic diagram of the hardware structure of a microphone system provided by an embodiment of the disclosure.
  • FIG. 11 schematically shows a block diagram of a computing processing device for executing the method according to the present disclosure.
  • Fig. 12 schematically shows a storage unit for holding or carrying program codes for implementing the method according to the present disclosure.
  • FIG. 3 shows a schematic structural diagram of a microphone system provided by an embodiment of the present disclosure, which includes a microphone module 10, a multimedia host 20, and a power amplifier 30.
  • the multimedia host 20 and the power amplifier 30 Both are communicatively connected to the microphone module 10, and the power amplifier 30 is also electrically connected to the speaker module 40;
  • the multimedia host 20 is used to obtain the voice signal in the in-vehicle sound signal for voice recognition;
  • the power amplifier 30 is used to obtain the in-vehicle voice signal And generate a noise-reduced frequency signal for the speaker module 40 to play according to the noise signal, the noise-reduced frequency signal and the noise signal are opposite in phase;
  • the speaker module is used for The noise-reduced frequency signal is played back to the noise-reduced frequency.
  • the microphone module 10 can obtain the sound signal in the car.
  • the multimedia host 20 and the power amplifier 30 are both communicatively connected to the microphone module 10, the microphone module 10 can communicate to the multimedia host based on the above communication connection.
  • 20 and the power amplifier 30 transmit the sound signal in the car, and the multimedia host 20 can realize speech recognition by acquiring the voice signal in the sound signal in the car; the power amplifier 30 acquires the noise signal in the sound signal in the car, and According to the noise signal, the noise-reducing frequency signal is generated for the speaker module 40 to play, and then the speaker module 40 plays the noise-reducing frequency signal, which can achieve the effect of noise reduction.
  • the audio signal can be uplink and downlink at the same time, which can reduce a large number of connecting wiring harnesses, not only reducing the cost of the entire vehicle, but also saving space in the vehicle and simplifying the assembly operation steps.
  • the upstream transmission and the downstream transmission of audio signals can be performed between the microphone module 10 and the multimedia host 20, that is, the audio signals can be transmitted from the microphone module 10 to the multimedia host 20, or by The multimedia host 20 is transmitted to the microphone module 10;
  • the upstream transmission and the downstream transmission of audio signals can also be performed between the microphone module 10 and the power amplifier 30, that is, the audio signals can be transmitted from the microphone module 10 to the power amplifier 30, or by The power amplifier 30 is transmitted to the microphone module 10;
  • the multimedia host 20 and the power amplifier 30 can communicate based on the microphone module 10, that is, the microphone module 10 is used as a bridge to realize the uplink and downlink transmission of audio signals between the power amplifier 30 and the multimedia host 20, namely
  • the audio signal can be transmitted from the power amplifier 30 to the multimedia host 20 via the microphone module 10, or can be transmitted from the multimedia host 20 to the power amplifier 30 via the microphone module 10, and then sent from the power amplifier 30 to the speaker module 40 for playback.
  • the microphone module 10 in order to perform uplink transmission and downlink transmission of audio signals between the microphone module 10 and the multimedia host 20, it is necessary to establish a first uplink communication link 101 and a first downlink between the microphone module 10 and the multimedia host 20.
  • the first uplink communication link 102 is used for the microphone module 10 to transmit audio signals to the multimedia host 20, and the first downlink communication link 102 is used for the multimedia host 20 to transmit audio signals.
  • a second uplink communication link needs to be established between the microphone module 10 and the multimedia host 20
  • the second downlink communication link 104 is used for the microphone module 10 to transmit audio signals to the power amplifier 30, and the second uplink communication link 103 is used for the power amplifier 30.
  • the audio signal is transmitted to the microphone module 10.
  • the multimedia host 20 and the power amplifier 30 are both communicatively connected to the microphone module 10 through a car audio bus (A2B), so that the multimedia host 20 and the microphone module 10, and the power amplifier 30 There is an uplink transmission channel and a downlink transmission channel between the microphone module 10 and the microphone module 10, respectively corresponding to the first uplink communication link 101, the first downlink communication link 102, the second uplink communication link 103, and the second downlink communication link.
  • Link 104 so that only one car audio bus connecting the multimedia host 20 and the microphone module 10 and a car audio bus connecting the power amplifier 30 and the microphone module 10 can be used to realize the multimedia host 20 and the microphone
  • the audio signal transmission between the module 10 and the power amplifier 30 can greatly reduce the use of wire harnesses and improve signal transmission efficiency.
  • the multimedia host 20, the microphone module 10, and the power amplifier 30 all adopt A2B interfaces to implement audio signal transmission.
  • the multimedia host 20 chip, the microphone module 10 chip, and the power amplifier 30 chip need to support the A2B transmission protocol.
  • the microphone module 10 includes a plurality of microphones connected in series via a car audio bus, and each of the above-mentioned microphones is correspondingly installed in a target area in the car, so that each of the above-mentioned microphones can obtain the corresponding target area of the car.
  • the microphone module 10 can then use the microphone module 10 to upload the in-vehicle audio signals to the multimedia host 20 and downlink the in-vehicle audio signals to the power amplifier 30 through the above-mentioned car audio bus.
  • 20 performs voice recognition by obtaining the voice signal therein, and obtains the noise signal from the power amplifier 30 for noise reduction processing.
  • the aforementioned speaker module 40 includes a plurality of speakers. Among them, in order to achieve the purpose of targeted noise reduction, at least one speaker should be arranged at the target area corresponding to each microphone, so that the noise reduction frequency corresponding to the noise signal at the target area should be played through the speaker to achieve the reduction. Noise effect.
  • the speaker needs to be controlled to play the noise reduction frequency corresponding to the noise signal at the target area to achieve the noise reduction effect, it is necessary to collect the noise of different seats and the sound of different sound zones in the area, and because In the embodiment of the present disclosure, the multiple microphones included in the microphone module 10 are connected in series through the car audio bus. Therefore, the distance between the microphone and the sound source is different, and the signal collection time is different, that is, the signal delay can be used. Timely, differentiate and collect sound signals from different seat noises and sound zones.
  • the in-vehicle audio signal is transmitted from the microphone module 10 to the multimedia host 20 (HUT).
  • the microphone near the power amplifier 30 is 00.
  • the microphones between the transmission to the multimedia host 20 are defined as 00, 01, 02, and 03 in sequence; when the in-vehicle voice signal is downstream, the in-vehicle voice signal is transmitted from the digital microphone to the power amplifier 30, which can be specified on the side close to the multimedia host
  • the microphone number is 00
  • the microphones that transmit signals to the power amplifier 30 are defined as 00, 01, 02, and 03 in sequence.
  • Figure 4 shows a schematic diagram of microphone serial connection and signal transmission.
  • the microphones are connected through the connector P and the car audio wiring harness.
  • Q1 is a microphone signal transmission harness, which is used to transmit the sound signal collected by the microphone to the connector;
  • Q2 is a transmission harness between microphones, which is used to conduct adjacent microphones to form a transmission link.
  • the microphone closer to the sound source collects the sound signal in the car earlier, and the microphone farther from the sound source collects the sound signal in the car later;
  • the internal sound signal is shown in Figure 5; when the sound signal in the car is transmitted to the voice module of the multimedia host 20, the sound signals collected by the four microphones in the car are distinguished according to the sequence of transmission of the sound waves.
  • the sound signals collected by the 4 microphones are distinguished according to the sequence of transmission of the sound waves.
  • the sound source is partitioned and generated for each seat. Noise reduction frequency signal in the sound zone.
  • the audio signal when the audio signal is upstream, that is, the audio signal is transmitted from the power amplifier 30 to the multimedia host 20, the audio signal follows the sequence number 1-2-3-4-5-6-7-8-9-10- Represented by the car audio bus; and when the audio signal is upstream, that is, the audio signal is transmitted from the power amplifier 30 to the multimedia host 20, the audio signal follows the sequence number 1-2-3-4-5-6-7- 8-9-10- Represented by the car audio bus.
  • At least one of the said microphone in order to create a good driving experience for the drivers and passengers at each seat, and to recognize the voice commands of the drivers and passengers at each seat, at least one of the said microphone.
  • the sound in the car mainly includes the human voice of the people on the car, the engine noise and the multimedia sound played by the speaker module 40, and because the engine noise has the characteristics of frequency in the 20Hz-3KHz frequency band and irregular noise waves, and the human voice has The frequency is in the 100Hz-10KHz frequency band and the sound waves have certain regular characteristics.
  • the microphone is required to have the ability to obtain both human voice signals and engine noise signals. Therefore, each of the above-mentioned microphones is at 20Hz- There is a flat frequency response curve in the 10KHz frequency range, as shown in FIG. 8 specifically, so that the microphone can collect voice signals and noise signals at the same time, and transmit them to the multimedia host 20 and the power amplifier 30 through A2B for sound signal analysis and processing.
  • the multimedia host 20 is also used to send multimedia audio signals to the power amplifier 30 via the microphone module 10, so that the power amplifier 30 drives the speaker module 40 to play the multimedia audio signals Corresponding multimedia audio.
  • the multimedia host 20 and the power amplifier 30 are both communicatively connected with the microphone module 10 through the car audio bus, the downlink transmission channel between the multimedia host 20 and the microphone module 10 can be used to transmit the multimedia The audio signal is transmitted to the microphone module 10, and then the multimedia audio signal is transmitted to the power amplifier 30 through the downlink transmission channel between the microphone module 10 and the power amplifier 30, and then the multimedia audio signal corresponding to the multimedia audio signal can be played through the speaker module 40 Multimedia audio.
  • the power amplifier 30 includes:
  • the active noise reduction module 31 is configured to obtain the noise signal in the sound signal in the vehicle, and generate the noise reduction frequency signal according to the noise signal;
  • the first digital signal processor 32 is configured to generate a total audio signal according to the multimedia audio signal and the noise-reduction frequency signal, send the total audio signal to the drive module, and pass the total audio signal through the The microphone module 10 is forwarded to the multimedia host 20;
  • the driving module 33 is configured to control the speaker module 40 to play audio according to the total audio signal
  • the multimedia host 20 is specifically configured to determine the voice signal according to the total audio signal and the in-vehicle sound signal.
  • the active noise reduction module may specifically be ANC DSP, which can analyze the frequency and sound wave regularity of the sound signal in the car transmitted by the microphone module 10, and use its internal signal filter to reduce the frequency at The sound waves in the 100Hz-10KHz frequency band are filtered out, and the irregular sound waves in the 20Hz-3KHz frequency band are retained, so as to obtain the noise signal in the sound signal in the car, and generate the noise-reduction frequency signal according to the noise signal, and then Pass the noise-reduction frequency signal to the first digital signal processor 32;
  • ANC DSP can analyze the frequency and sound wave regularity of the sound signal in the car transmitted by the microphone module 10, and use its internal signal filter to reduce the frequency at The sound waves in the 100Hz-10KHz frequency band are filtered out, and the irregular sound waves in the 20Hz-3KHz frequency band are retained, so as to obtain the noise signal in the sound signal in the car, and generate the noise-reduction frequency signal according to the noise signal, and then Pass the noise-reduction frequency signal to the first digital signal processor 32;
  • the first digital signal processor 32 can receive the multimedia audio signal transmitted by the multimedia host 20 via the microphone module 10, and receive the noise reduction generated by the active noise reduction module.
  • the audio signal is mixed to generate the total audio signal, and the total audio signal is sent to the driving module to drive the speaker to play the above-mentioned total audio signal, which can achieve the noise reduction effect while playing the multimedia audio; at the same time, the above-mentioned first digital The signal processor also forwards the total audio signal to the multimedia host 20 via the microphone module 10, so that the multimedia host 20 can accurately recognize the voice signal according to the total audio signal and the sound signal in the vehicle;
  • the multimedia host 20 specifically compares the total audio signal with the in-vehicle audio signal, and uses the human voice signal added by the in-vehicle audio signal compared to the total audio signal as the voice signal corresponding to the target area, thereby realizing the comparison. Voice recognition of the target area.
  • the multimedia host 20 specifically includes:
  • the second digital signal processor 21 is configured to obtain the human voice signal in the voice signal in the vehicle;
  • the system-on-chip 22 is used to determine the voice signal according to the human voice signal and the total audio signal, and when the voice signal is acquired, generate a control instruction, the control instruction is used to pause playing the multimedia Audio, and wake up voice recognition function.
  • the second digital signal processor may specifically be a voice DSP, which filters out irregular sound waves with frequencies in the 20Hz-3KHz frequency band through its internal signal filter, while retaining sound waves in the 100Hz-10KHz frequency band. , So as to obtain the human voice signal in the in-vehicle voice signal, and forward the human voice signal to the on-chip system to determine whether the human voice signal contains a voice signal;
  • a voice DSP which filters out irregular sound waves with frequencies in the 20Hz-3KHz frequency band through its internal signal filter, while retaining sound waves in the 100Hz-10KHz frequency band.
  • the system-on-chip compares the human voice signal and the total audio signal to determine whether there is a voice signal in the human voice signal that is not included in the total audio signal. If there is a voice signal, it means that the driver and passengers Voice control instructions, therefore, control instructions need to be generated to pause the playback of the multimedia audio, wake up the voice recognition function, and enter the voice recognition state.
  • FIG. 9 shows a signal processing flowchart of the microphone system provided by an embodiment of the present disclosure.
  • the voice signal in the car, engine noise signal, and speaker sound signal are collected by the microphone and mixed into one in-vehicle sound signal;
  • the microphone divides the mixed in-vehicle sound signal into two channels through A2B 2-A and 2 -B is simultaneously transmitted to the voice DSP of the multimedia host and the ANC DSP of the power amplifier for audio signal analysis and processing to obtain human voice signals and engine noise signals respectively;
  • the voice DSP of the multimedia host processes the voice signals in 2-A Send to the system on chip (SOC);
  • step 3 the system-on-chip transmits the multimedia audio to the microphone through A2B; then in step 4, the multimedia audio is transmitted to the Sigma DSP in the power amplifier through A2B through the microphone, and the Sigma DSP processes the multimedia audio with ANC DSP to obtain After the noise reduction frequency signal is gathered, it is sent to the power amplifier chip to amplify the small signal and emit sound through the speaker. At the same time, it sends a feedback signal to the microphone; then in step 6, the feedback signal is transmitted to the multimedia host via the microphone through A2B, making the system on chip Comparing the human voice signal and the feedback signal, determine whether there is a voice signal in the human voice signal.
  • voice signal If there is a voice signal, it means the voice control command issued by the driver and passenger, so it is necessary to generate a control command .
  • voice control command issued by the driver and passenger, so it is necessary to generate a control command .
  • To pause the playback of the multimedia audio wake up the voice recognition function, enter the voice recognition state, and complete the process of interrupting the multimedia host to play the multimedia audio and wake up the voice recognition function.
  • FIG. 10 shows a schematic diagram of the hardware structure of the microphone system provided by an embodiment of the present disclosure.
  • microphone A, microphone B, and microphone are installed on the roof of the main driver’s seat, passenger seat, right rear seat, and rear seat in sequence.
  • the microphone A is connected to the HUT through the car audio bus
  • the microphone D is connected to the power amplifier through the car audio bus, so as to construct the above-mentioned microphone system.
  • Another object of the present disclosure is to provide a control method, which is applied to a microphone module, and the microphone module is communicatively connected with a multimedia host and a power amplifier; the method includes:
  • the multimedia host and the power amplifier are both communicatively connected with the microphone module through a car audio bus.
  • the microphone module includes a plurality of microphones connected in series via a car audio bus, and each of the microphones is correspondingly installed in a target area in the car.
  • each of the microphones has a flat frequency response curve in the frequency range of 20Hz-10KHz.
  • At least one microphone is provided for each seat area in the vehicle.
  • the method further includes:
  • the multimedia audio signal sent by the multimedia host is forwarded to the power amplifier, so that the power amplifier drives the speaker module to play the multimedia audio signal.
  • the method further includes:
  • the total audio signal emitted by the power amplifier is forwarded to the multimedia host, so that the multimedia host can determine the voice signal according to the total audio signal and the in-vehicle sound signal.
  • Another object of the present disclosure is to provide a vehicle, wherein the vehicle includes the microphone system.
  • the multimedia host and the power amplifier are all communicatively connected with the microphone module, so that the microphone module can send in-vehicle sound signals to the multimedia host and the power amplifier based on the above communication connection , And the multimedia host can realize voice recognition by acquiring the voice signal in the in-vehicle sound signal; the power amplifier acquires the noise signal in the in-vehicle sound signal, and generates it for the speaker module according to the noise signal The played noise-reduction frequency signal is then played by the speaker module to achieve the effect of noise reduction.
  • the device embodiments described above are merely illustrative, where the units described as separate components may or may not be physically separate, and the components displayed as units may or may not be physical units, that is, they may be located in One place, or it can be distributed to multiple network units. Some or all of the modules can be selected according to actual needs to achieve the purpose of the solution of the embodiment. Those of ordinary skill in the art can understand and implement without creative work.
  • the various component embodiments of the present disclosure may be implemented by hardware, or by software modules running on one or more processors, or by a combination of them.
  • a microprocessor or a digital signal processor (DSP) may be used in practice to implement some or all of the functions of some or all of the components in the computing processing device according to the embodiments of the present disclosure.
  • DSP digital signal processor
  • the present disclosure can also be implemented as a device or device program (for example, a computer program and a computer program product) for executing part or all of the methods described herein.
  • Such a program for realizing the present disclosure may be stored on a computer-readable medium, or may have the form of one or more signals.
  • Such a signal can be downloaded from an Internet website, or provided on a carrier signal, or provided in any other form.
  • FIG. 11 shows a computing processing device that can implement the method according to the present disclosure.
  • the computing processing device traditionally includes a processor 1010 and a computer program product in the form of a memory 1020 or a computer readable medium.
  • the memory 1020 may be an electronic memory such as flash memory, EEPROM (Electrically Erasable Programmable Read Only Memory), EPROM, hard disk, or ROM.
  • the memory 1020 has a storage space 1030 for executing program codes 1031 of any method steps in the above methods.
  • the storage space 1030 for program codes may include various program codes 1031 respectively used to implement various steps in the above method. These program codes can be read from or written into one or more computer program products.
  • These computer program products include program code carriers such as hard disks, compact disks (CDs), memory cards or floppy disks.
  • Such a computer program product is usually a portable or fixed storage unit as described with reference to FIG. 12.
  • the storage unit may have storage segments, storage spaces, etc. arranged similarly to the memory 1020 in the computing processing device of FIG. 11.
  • the program code can be compressed in a suitable form, for example.
  • the storage unit includes computer-readable codes 1031', that is, codes that can be read by, for example, a processor such as 1010. These codes, when run by a computing processing device, cause the computing processing device to execute the method described above. The various steps.

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  • Circuit For Audible Band Transducer (AREA)

Abstract

一种麦克风系统、控制方法及车辆，其中，系统包括麦克风模组（10）、多媒体主机（20）及功率放大器（30），多媒体主机（20）及功率放大器（30）均与麦克风模组（10）通信连接，功率放大器（30）还与扬声器模组（40）电连接。本系统无需单独设置语音麦克风及降噪麦克风来分别采集语音信号和噪声信号，且是基于通信连接在麦克风模组（10）与多媒体主机（20）之间、以及麦克风模组（10）与功率放大器（30）之间进行音频信号传输，可以减少大量连接线束。

Description

一种麦克风系统、控制方法及车辆
相关申请的交叉引用
本公开要求在2020年05月29日提交中国专利局、申请号为202010478606.1、名称为“一种麦克风系统、控制方法及车辆”的中国专利申请的优先权，其全部内容通过引用结合在本公开中。
技术领域
本公开涉及汽车技术领域，特别涉及一种麦克风系统、控制方法及车辆。
背景技术
当前，为了实现车内降噪及语音识别功能，需要在车内设置两组麦克风。其中一组麦克风用于对不同音区进行声源定位，然后多路音频按采样点交替组合成一路音频信号传输到主机进行语音信号处理；另一组麦克风则用于获取车内噪声，并发送至功放降噪模块进行分析处理，通过车内扬声器产生反相声波抵消发动机噪声，从而实现降噪效果。
以四座汽车为例，音区的划分如图1所示，将每个座位区域划分为一个音区；而为了主动降噪和声场分区功能，至少需要在车内布置8只麦克风，即4只语音麦克风和4只降噪麦克风，即在每个音区至少分别设置一个语音麦克风及一个降噪麦克风，用于分别采集不同频率的声音信号发送给主机语音模块和功率放大器的主动降噪总成进行声音分析处理。
为了实现上述声音信号的采集与传输，需要大量的麦克风和线束，不仅增加了整车成本增加，而且占用大量车内空间、装配操作繁琐，也使得整车电磁兼容性(Electro Magnetic Compatibility，EMC)难以满足要求，对各个功能模块的影响较大。如图2所示，图2示出了传统方式中通过麦克风实现降噪功能的线束连接示意图。另外，因为语音麦克风及降噪麦克风的采集音频信号频率范围不同，因而传统通过麦克风实现降噪功能的方式对麦克风的性能要求也十分严格，也进一步增加了整车成本。
发明内容
有鉴于此，本公开旨在提出一种麦克风系统、控制方法及车辆，以解决现有技术中为了实现车内主动降噪和声场分区功能，需要同时设置语音麦克风及降噪麦克风且需要较多线束进行连接，容易增加成本、占用大量车内空间的问题。
为达到上述目的，本公开的技术方案是这样实现的：
一种麦克风系统，其中，包括麦克风模组、多媒体主机及功率放大器，所述多媒体主机及所述功率放大器均与所述麦克风模组通信连接，所述功率放大器还与扬声器模组电连接；
所述麦克风模组用于获取车内声音信号，并将所述车内声音信号发送至所述多媒体主机及所述功率放大器；
所述多媒体主机用于获取所述车内声音信号中的语音信号，以进行语音识别；
所述功率放大器用于获取所述车内声音信号中的噪声信号，并根据所述噪声信号生成降噪音频信号，所述降噪音频信号与所述噪声信号的相位相反；
所述扬声器模组用于播放所述降噪音频信号。
进一步地，所述的麦克风系统中，所述多媒体主机及所述功率放大器均通过汽车音频总线与所述麦克风模组通信连接。
进一步地，所述的麦克风系统中，所述麦克风模组包括通过汽车音频总线串接的多个麦克风，每个所述麦克风对应安装在车内的目标区域。
进一步地，所述的麦克风系统中，每个所述麦克风在20Hz-10KHz的频率区间内具有平坦的频响曲线。
进一步地，所述的麦克风系统中，车内每个座位区域对应设置至少1个所述麦克风。
进一步地，所述的麦克风系统中，所述多媒体主机还用于将多媒体音频信号经由所述麦克风模组发送至所述功率放大器，以供所述功率放大器驱动所述扬声器模组播放所述多媒体音频信号对应的多媒体音频。
进一步地，所述的麦克风系统中，所述功率放大器包括：
主动降噪模块，用于获取所述车内声音信号中的噪声信号，并根据所述噪声信号生成所述降噪音频信号；
第一数字信号处理器，用于根据所述多媒体音频信号及所述降噪音频信 号，生成音频总信号；
驱动模块，用于根据所述音频总信号控制所述扬声器模组播放音频。
进一步地，所述的麦克风系统中，所述功率放大器，还用于将所述音频总信号经由所述麦克风模组转发至所述多媒体主机；
所述多媒体主机，具体用于根据所述音频总信号及所述车内声音信号，获得所述语音信号。
进一步地，所述的麦克风系统中，所述多媒体主机包括：
第二数字信号处理器，用于获取所述车内声音信号中的人声信号；
片上系统，用于根据所述人声信号及所述音频总信号，确定所述语音信号，并在获取到所述语音信号时，生成控制指令，所述控制指令用于暂停播放所述多媒体音频，并唤醒语音识别功能。
本公开的另一目的在于提出一种控制方法，其中，应用于麦克风模组，所述麦克风模组与多媒体主机及功率放大器通信连接；所述方法包括：
获取车内声音信号；
将所述车内声音信号发送至所述多媒体主机，以供所述多媒体主机获取所述车内声音信号中的语音信号；
将所述车内声音信号发送至所述功率放大器，以供所述功率放大器获取所述车内声音信号中的噪声信号，并根据所述噪声信号生成供所述扬声器模组播放的降噪音频。
进一步地，所述方法还包括：
将所述多媒体主机发出的多媒体音频信号转发至所述功率放大器，以供所述功率放大器驱动所述扬声器模组播放所述多媒体音频信号。
进一步地，所述方法还包括：
将所述功率放大器发出的音频总信号转发至所述多媒体主机，以供所述多媒体主机根据所述音频总信号及所述车内声音信号，确定所述语音信号。
相对于在先技术，本公开所述的麦克风系统及控制方法具有以下优势：
多媒体主机及功率放大器均与麦克风模组通信连接，使得麦克风模组可以基于上述通信连接向多媒体主机及功率放大器发送车内声音信号，且多媒体主机通过获取所述车内声音信号中的语音信号，可以实现语音识别；由功率放大器获取所述车内声音信号中的噪声信号，并根据所述噪声信号生成供 所述扬声器模组播放的降噪音频信号，再由所述扬声器模组播放上述降噪音频信号，即可以达到降噪的效果。因为无需单独设置语音麦克风及降噪麦克风来分别采集语音信号和噪声信号，且是基于通信连接在麦克风模组与多媒体主机之间、以及麦克风模组与功率放大器之间进行音频信号传输，可以减少大量连接线束，不仅减少了整车成本，还可以节约车内空间、简化装配操作步骤，从而解决了现有技术中为了实现车内主动降噪和声场分区功能，需要同时设置语音麦克风及降噪麦克风且需要较多线束进行连接，容易增加成本、占用大量车内空间的问题。
本公开的再一目的在于提出一种车辆，其中，所述车辆包括所述的麦克风系统。
所述车辆与上述一种麦克风系统相对于现有技术所具有的优势相同，在此不再赘述。
上述说明仅是本公开技术方案的概述，为了能够更清楚了解本公开的技术手段，而可依照说明书的内容予以实施，并且为了让本公开的上述和其它目的、特征和优点能够更明显易懂，以下特举本公开的具体实施方式。
附图说明
为了更清楚地说明本公开实施例或相关技术中的技术方案，下面将对实施例或相关技术描述中所需要使用的附图作一简单地介绍，显而易见地，下面描述中的附图是本公开的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。
构成本公开的一部分的附图用来提供对本公开的进一步理解，本公开的示意性实施例及其说明用于解释本公开，并不构成对本公开的不当限定。在附图中：
图1为声场分区示意图；
图2为传统方式中通过麦克风实现降噪功能的线束连接示意图；
图3为本公开实施例所提出的麦克风系统的结构示意图；
图4为本公开实施例所提出的麦克风串接及信号传输示意图；
图5为本公开实施例中麦克风采集的车内声音信号示意图；
图6为本公开实施例中音频信号上行传输时的传输路径示意图；
图7为本公开实施例中音频信号上行传输时的传输路径示图；
图8为本公开实施例中麦克风的频响曲线图；
图9为本公开实施例所提供的麦克风系统的信号处理流程图；
图10为本公开实施例所提供的麦克风系统的硬件结构示意图；
图11示意性地示出了用于执行根据本公开的方法的计算处理设备的框图；并且
图12示意性地示出了用于保持或者携带实现根据本公开的方法的程序代码的存储单元。
具体实施例
下面将参考附图更详细地描述本公开的实施例。虽然附图中显示了本公开的实施例，然而应当理解，可以以各种形式实现本公开而不应被这里阐述的实施例所限制。相反，提供这些实施例是为了能够更彻底地理解本公开，并且能够将本公开的范围完整地传达给本领域的技术人员。
需要说明的是，在不冲突的情况下，本公开中的实施例及实施例中的特征可以相互组合。
下面将参考附图并结合实施例来详细说明本公开。
请参阅图3，示出了本公开实施例所提供的一种麦克风系统的结构示意图，其中，包括麦克风模组10、多媒体主机20及功率放大器30，所述多媒体主机20及所述功率放大器30均与所述麦克风模组10通信连接，所述功率放大器30还与扬声器模组40电连接；所述麦克风模组10用于获取车内声音信号，并将所述车内声音信号发送至所述多媒体主机20及所述功率放大器30；所述多媒体主机20用于获取所述车内声音信号中的语音信号，以进行语音识别；所述功率放大器30用于获取所述车内声音信号中的噪声信号，并根据所述噪声信号生成供所述扬声器模组40播放的降噪音频信号，所述降噪音频信号与所述噪声信号的相位相反；所述扬声器模组用于根据所述降噪音频信号播放降噪音频。
本公开实施例中，麦克风模组10可以获取车内的声音信号，同时，因为多媒体主机20及功率放大器30均与麦克风模组10通信连接，使得麦克风模组10可以基于上述通信连接向多媒体主机20及功率放大器30发送车内声音 信号，且多媒体主机20通过获取所述车内声音信号中的语音信号，可以实现语音识别；由功率放大器30获取所述车内声音信号中的噪声信号，并根据所述噪声信号生成供所述扬声器模组40播放的降噪音频信号，再由所述扬声器模组40播放上述降噪音频信号，即可以达到降噪的效果。
因为无需单独设置语音麦克风及降噪麦克风来分别采集语音信号和噪声信号，且是基于通信连接在麦克风模组10与多媒体主机20之间、以及麦克风模组10与功率放大器30之间进行音频信号传输，且因为是基于通信连接进行音频信号传输，音频信号可同时上行和下行，可以减少大量连接线束，不仅减少了整车成本，还可以节约车内空间、简化装配操作步骤。
本公开实施例所提供的麦克风系统中，麦克风模组10与多媒体主机20之间可以进行音频信号的上行传输及下行传输，即音频信号可以由麦克风模组10传送至多媒体主机20，也可以由多媒体主机20传送至麦克风模组10；麦克风模组10与功率放大器30之间也可以进行音频信号的上行传输及下行传输，即音频信号可以由麦克风模组10传送至功率放大器30，也可以由功率放大器30传送至麦克风模组10；
其中，多媒体主机20与功率放大器30之间则可以基于麦克风模组10进行通信，即利用麦克风模组10作为桥梁，实现功率放大器30与多媒体主机20之间音频信号的上行传输及下行传输，即音频信号可以由功率放大器30经由麦克风模组10传送至多媒体主机20，也可以由多媒体主机20经由麦克风模组10传送至功率放大器30，然后由功率放大器30发送至扬声器模组40播放。
具体地，为了在麦克风模组10与多媒体主机20之间可以进行音频信号的上行传输及下行传输，需要在麦克风模组10与多媒体主机20之间建立第一上行通信链路101及第一下行通信链路102，上述第一上行通信链路101用于供麦克风模组10将音频信号传送至多媒体主机20，上述第一下行通信链路102则用于供多媒体主机20将音频信号传送至麦克风模组10处；而为了在麦克风模组10与功率放大器30之间也可以进行音频信号的上行传输及下行传输，需要在麦克风模组10与多媒体主机20之间建立第二上行通信链路103及第二下行通信链路104，上述第二下行通信链路104用于供麦克风模组10将音频信号传送至功率放大器30，上述第二上行通信链路103则用于供功率 放大器30将音频信号传送至麦克风模组10处。
可选地，所述多媒体主机20及所述功率放大器30均通过汽车音频总线(A2B)与所述麦克风模组10通信连接，使得在多媒体主机20与麦克风模组10之间、以及功率放大器30与麦克风模组10之间均具有上行传输通道及下行传输通道，分别对应于上述第一上行通信链路101、第一下行通信链路102、第二上行通信链路103及第二下行通信链路104，从而使得只需利用一根连接多媒体主机20与麦克风模组10的汽车音频总线，以及一根连接功率放大器30与麦克风模组10的汽车音频总线，即可以实现多媒体主机20、麦克风模组10及所述功率放大器30之间的音频信号传输，可大幅度减少线束使用，提升信号的传输效率。
具体地，多媒体主机20、麦克风模组10及功率放大器30均采用A2B接口，以实现音频信号的传输。另外，多媒体主机20芯片、麦克风模组10芯片及功率放大器30芯片需要支A2B传输协议。
可选地，所述麦克风模组10包括通过汽车音频总线串接的多个麦克风，且每个上述麦克风对应安装在车内的目标区域，使得每个上述麦克风可以获取其对应的目标区域的车内声音信号，进而可以由麦克风模组10将获得的车内声音信号通过上述汽车音频总线将车内声音信号上传至多媒体主机20、以及将车内音频信号下行至功率放大器30，再由多媒体主机20通过获取其中的语音信号进行语音识别，以及由功率放大器30获取其中的噪声信号进行降噪处理。
本公开实施例中，上述扬声器模组40包括多个扬声器。其中，为了实现针对性地降噪目的，应该在每个上述麦克风对应的目标区域处至少设置一个上述扬声器，以通过该扬声器播放与该目标区域处的噪声信号相对应的降噪音频来实现降噪效果。
在实际应用中，因为需要针对性地控制扬声器播放与该目标区域处的噪声信号相对应的降噪音频来实现降噪效果，则需要采集和区域不同座位噪声和不同声区的声音，而因为本公开实施方式中，上述麦克风模组10所包含的多个麦克风是通过汽车音频总线串接在一起的，因而麦克风与声源距离不同，采集信号的时间便不同，也即可以利用信号的延时性，进行不同座位噪声及声区的声音信号的区分采集。
以4个麦克风为例，在车内声音信号上行时，车内声音信号由麦克风模组10传输至多媒体主机20(HUT)，规定在靠近功率放大器30(Amplifier，AMP)侧的麦克风为00，至多媒体主机20端传输之间的麦克风依次定义为00,01,02,03；在车内声音信号下行时，车内声音信号由数字麦克风传输至功率放大器30，可以规定在靠近多媒体主机侧的麦克风编号为00，至功率放大器30端传输信号的麦克风依次定义为00,01,02,03。具体如图4所示，图4示出了麦克风串接及信号传输示意图。
其中，麦克风之间通过插接件P及汽车音频线束连接，每根线束内有两根线，其中一根用于上行传输，另一根则用于下行传输。其中，Q1为麦克风信号传输线束，用于将麦克风所采集的声音信号传输至插接件处；Q2为麦克风间传输线束，用于将相邻麦克风导通，形成传输链路。
其中，当上述4个麦克风采集车内声音信号时，离声源越近的麦克风采集车内声音信号越早，离声源越远的麦克风采集车内声音信号越晚；4个麦克风采集的车内声音信号如图5所示；当车内声音信号传输至多媒体主机20的语音模块后，根据传输声波的先后顺序对4个麦克风采集的车内声音信号进行区分与座位相对应，完成声源分区；当车内声音信号传输至功率播放器的降噪模块后，根据传输声波的先后顺序对4个麦克风采集的车内声音信号进行区分与座位相对应，完成声源分区，并生成针对各个声区的降噪音频信号。
具体地，当音频信号上行即音频信号由功率放大器30端传输至多媒体主机20时，音频信号沿图6中的序号①-②-③-④-⑤-⑥-⑦-⑧-⑨-⑩-
Figure PCTCN2021096282-appb-000001
所代表的汽车音频总线进行；而当音频信号上行即音频信号由功率放大器30端传输至多媒体主机20时，音频信号沿图7中的序号①-②-③-④-⑤-⑥-⑦-⑧-⑨-⑩-
Figure PCTCN2021096282-appb-000002
所代表的汽车音频总线进行。
可选地，为了为每个座位处的驾乘人员营造良好的驾乘体验，以及识别每个座位处的驾乘人员的语音指令，可以在车内每个座位区域对应设置至少1个所述麦克风。
其中，车内声音主要包括车上人员说话的人声、发动机噪声以及扬声器模组40播放的多媒体声音，且因为发动机噪声具有频率在20Hz-3KHz频段、无规律噪声波的特性，而人声具有频率在100Hz-10KHz频段且声波具有一定的规律的特性，要实现语音识别及降噪效果，则要求麦克风同时具有获取人 声信号及发动机噪声信号的能力，因而上述每个所述麦克风在20Hz-10KHz的频率区间内具有平坦的频响曲线，具体如图8所示，使得上述麦克风可以同时采集语音信号和噪声信号，通过A2B传输至多媒体主机20和功率放大器30进行声音信号分析处理。
具体地，所述多媒体主机20还用于将多媒体音频信号经由所述麦克风模组10发送至所述功率放大器30，以供所述功率放大器30驱动所述扬声器模组40播放所述多媒体音频信号对应的多媒体音频。本公开实施例中，因为多媒体主机20及所述功率放大器30均通过汽车音频总线与所述麦克风模组10通信连接，因而可以利用多媒体主机20与麦克风模组10之间的下行传输通道将多媒体音频信号传输至麦克风模组10，再通过麦克风模组10与功率放大器30之间的下行传输通道将多媒体音频信号传输至功率放大器30，进而可以通过扬声器模组40播放该多媒体音频信号所对应的多媒体音频。
可选地，在一种实施方式中，所述功率放大器30包括：
主动降噪模块31，用于获取所述车内声音信号中的噪声信号，并根据所述噪声信号生成所述降噪音频信号；
第一数字信号处理器32，用于根据所述多媒体音频信号及所述降噪音频信号，生成音频总信号，并将所述音频总信号发送至驱动模块，以及将所述音频总信号经由所述麦克风模组10转发至所述多媒体主机20；
驱动模块33，用于根据所述音频总信号控制所述扬声器模组40播放音频；
所述多媒体主机20，具体用于根据所述音频总信号及所述车内声音信号，确定所述语音信号。
在本实施方式中，主动降噪模块具体可以为ANC DSP，其可以通过分析由麦克风模组10传输过来的车内声音信号的频率及声波规律性，通过其内部的信号滤波器，将频率在100Hz-10KHz频段的声波滤除，而保留频率在20Hz-3KHz频段的无规律声波，从而获取所述车内声音信号中的噪声信号，并根据所述噪声信号生成所述降噪音频信号，再将该降噪音频信号传入第一数字信号处理器32；
本实施方式中，第一数字信号处理器32，具体可以为Sigma DSP，其可以接收由多媒体主机20经由麦克风模组10传输过来的多媒体音频信号，以及接收所述主动降噪模块生成的降噪音频信号，混合生成音频总信号，并将 所述音频总信号发送至驱动模块，用以驱动扬声器播放上述音频总信号，可以在播放多媒体音频的同时，实现降噪效果；同时，上述第一数字信号处理器还会将所述音频总信号经由所述麦克风模组10转发至所述多媒体主机20，以便于多媒体主机20根据该音频总信号及车内声音信号，准确识别出语音信号；
本实施方式中，多媒体主机20具体是通过对比音频总信号及车内声音信号，将车内声音信号相较于音频总信号所增加的人声信号，作为对应目标区域的语音信号，进而实现对目标区域的语音识别。
可选地，在一种实施方式中，所述多媒体主机20具体包括：
第二数字信号处理器21，用于获取所述车内声音信号中的人声信号；
片上系统22，用于根据所述人声信号及所述音频总信号，确定所述语音信号，并在获取到所述语音信号时，生成控制指令，所述控制指令用于暂停播放所述多媒体音频，并唤醒语音识别功能。
在本实施方式中，第二数字信号处理器具体可以为语音DSP，通过其内部的信号滤波器，将频率在20Hz-3KHz频段的无规律声波滤除，而保留频率在100Hz-10KHz频段的声波，从而获取所述车内声音信号中的人声信号，并将该人声信号转发至片上系统，用以确定该人声信号中是否由语音信号；
在本实施方式中，片上系统通过对比人声信号及所述音频总信号，确定人声信号中是否存在音频总信号中所不具有了语音信号，若存在语音信号，则说明驾乘人员发出的语音控制指令，因而需要生成控制指令，以暂停播放所述多媒体音频，并唤醒语音识别功能，进入语音识别状态。
在实际应用中，请参阅图9，示出了本公开实施例所提供的麦克风系统的信号处理流程图。
如图9所示，由麦克风采集车内的语音信号、发动机噪声信号、扬声器声音信号并混合成一路车内声音信号；麦克风将混合得到的车内声音信号通过A2B分两路②-A和②-B同时传输到多媒体主机的语音DSP和功率放大器的ANC DSP进行音频信号的分析和处理，分别获得人声信号及发动机噪声信号；多媒体主机的语音DSP将②-A中的语音信号处理完成后送入片上系统(SOC)；
在步骤③中，片上系统将多媒体音频通过A2B传输到麦克风；然后在步 骤④中经过麦克风，将多媒体音频通过A2B传输至功率放大器中的Sigma DSP，该Sigma DSP将多媒体音频与ANC DSP处理后得到降噪音频信号汇聚后送入功放芯片进行小信号放大并通过扬声器发出声音，同时通过发送一路反馈信号至麦克风；再在步骤⑥中，经由麦克风将反馈信号通过A2B传输至多媒体主机，使得片上系统在对比人声信号及所述反馈信号，确定人声信号中是否存在音频总信号中所不具有了语音信号，若存在语音信号，则说明驾乘人员发出的语音控制指令，因而需要生成控制指令，以暂停播放所述多媒体音频，并唤醒语音识别功能，进入语音识别状态，完成打断多媒体主机播放多媒体音频及唤醒语音识别功能的过程。
在实际应用中，请参阅图10，示出了本公开实施例所提供的麦克风系统的硬件结构示意图。以四座汽车为例，且在每个座位上设置一个上述麦克风，具体地，是在主驾驶座、副驾驶座、右后座及坐后座的车顶处依次安装麦克风A、装麦克风B、装麦克风C、装麦克风D，且按主驾驶座、副驾驶座、右后座、坐后座的顺序将麦克风A、装麦克风B、装麦克风C、装麦克风D通过汽车音频总线串接起来，并将麦克风A通过汽车音频总线与HUT连接，以及将麦克风D通过汽车音频总线与与功率放大器连接，从而构建成上述麦克风系统。
本公开的另一目的在于提出一种控制方法，其中，应用于麦克风模组，所述麦克风模组与多媒体主机及功率放大器通信连接；所述方法包括：
获取车内声音信号；
将所述车内声音信号发送至所述多媒体主机，以供所述多媒体主机获取所述车内声音信号中的语音信号；
将所述车内声音信号发送至所述功率放大器，以供所述功率放大器获取所述车内声音信号中的噪声信号，并根据所述噪声信号生成供所述扬声器模组播放的降噪音频。
可选地，所述的方法中，所述多媒体主机及所述功率放大器均通过汽车音频总线与所述麦克风模组通信连接。
可选地，所述的方法中，所述麦克风模组包括通过汽车音频总线串接的多个麦克风，每个所述麦克风对应安装在车内的目标区域。
可选地，所述的方法中，每个所述麦克风在20Hz-10KHz的频率区间内具 有平坦的频响曲线。
可选地，所述的方法中，车内每个座位区域对应设置至少1个所述麦克风。
可选地，所述方法还包括：
将所述多媒体主机发出的多媒体音频信号转发至所述功率放大器，以供所述功率放大器驱动所述扬声器模组播放所述多媒体音频信号。
可选地，所述方法还包括：
将所述功率放大器发出的音频总信号转发至所述多媒体主机，以供所述多媒体主机根据所述音频总信号及所述车内声音信号，确定所述语音信号。
本公开的再一目的在于提出一种车辆，其中，所述车辆包括所述的麦克风系统。
关于上述方法和车辆的技术细节和好处已在上述系统中进行了详细阐述，此处不再赘述。
综上所述，本公开提供的麦克风系统、控制方法及车辆，多媒体主机及功率放大器均与麦克风模组通信连接，使得麦克风模组可以基于上述通信连接向多媒体主机及功率放大器发送车内声音信号，且多媒体主机通过获取所述车内声音信号中的语音信号，可以实现语音识别；由功率放大器获取所述车内声音信号中的噪声信号，并根据所述噪声信号生成供所述扬声器模组播放的降噪音频信号，再由所述扬声器模组播放上述降噪音频信号，即可以达到降噪的效果。因为无需单独设置语音麦克风及降噪麦克风来分别采集语音信号和噪声信号，且是基于通信连接在麦克风模组与多媒体主机之间、以及麦克风模组与功率放大器之间进行音频信号传输，可以减少大量连接线束，不仅减少了整车成本，还可以节约车内空间、简化装配操作步骤，从而解决了现有技术中为了实现车内主动降噪和声场分区功能，需要同时设置语音麦克风及降噪麦克风且需要较多线束进行连接，容易增加成本、占用大量车内空间的问题。
以上所描述的装置实施例仅仅是示意性的，其中所述作为分离部件说明的单元可以是或者也可以不是物理上分开的，作为单元显示的部件可以是或者也可以不是物理单元，即可以位于一个地方，或者也可以分布到多个网络单元上。可以根据实际的需要选择其中的部分或者全部模块来实现本实施例 方案的目的。本领域普通技术人员在不付出创造性的劳动的情况下，即可以理解并实施。
本公开的各个部件实施例可以以硬件实现，或者以在一个或者多个处理器上运行的软件模块实现，或者以它们的组合实现。本领域的技术人员应当理解，可以在实践中使用微处理器或者数字信号处理器(DSP)来实现根据本公开实施例的计算处理设备中的一些或者全部部件的一些或者全部功能。本公开还可以实现为用于执行这里所描述的方法的一部分或者全部的设备或者装置程序(例如，计算机程序和计算机程序产品)。这样的实现本公开的程序可以存储在计算机可读介质上，或者可以具有一个或者多个信号的形式。这样的信号可以从因特网网站上下载得到，或者在载体信号上提供，或者以任何其他形式提供。
例如，图11示出了可以实现根据本公开的方法的计算处理设备。该计算处理设备传统上包括处理器1010和以存储器1020形式的计算机程序产品或者计算机可读介质。存储器1020可以是诸如闪存、EEPROM(电可擦除可编程只读存储器)、EPROM、硬盘或者ROM之类的电子存储器。存储器1020具有用于执行上述方法中的任何方法步骤的程序代码1031的存储空间1030。例如，用于程序代码的存储空间1030可以包括分别用于实现上面的方法中的各种步骤的各个程序代码1031。这些程序代码可以从一个或者多个计算机程序产品中读出或者写入到这一个或者多个计算机程序产品中。这些计算机程序产品包括诸如硬盘，紧致盘(CD)、存储卡或者软盘之类的程序代码载体。这样的计算机程序产品通常为如参考图12所述的便携式或者固定存储单元。该存储单元可以具有与图11的计算处理设备中的存储器1020类似布置的存储段、存储空间等。程序代码可以例如以适当形式进行压缩。通常，存储单元包括计算机可读代码1031’，即可以由例如诸如1010之类的处理器读取的代码，这些代码当由计算处理设备运行时，导致该计算处理设备执行上面所描述的方法中的各个步骤。
所属领域的技术人员可以清楚地了解到，为描述的方便和简洁，上述描述的系统、装置和单元的具体工作过程，可以参考前述方法实施例中的对应过程，在此不再赘述。
以上所述仅为本公开的较佳实施例而已，并不用以限制本公开，凡在本 公开的精神和原则之内所作的任何修改、等同替换和改进等，均应包含在本公开的保护范围之内。
以上所述，仅为本公开的具体实施方式，但本公开的保护范围并不局限于此，任何熟悉本技术领域的技术人员在本公开揭露的技术范围内，可轻易想到变化或替换，都应涵盖在本公开的保护范围之内。因此，本公开的保护范围应以权利要求的保护范围为准。

Claims (15)

  1. 一种麦克风系统，其特征在于，包括麦克风模组、多媒体主机及功率放大器，所述多媒体主机及所述功率放大器均与所述麦克风模组通信连接，所述功率放大器还与扬声器模组电连接；
    所述麦克风模组用于获取车内声音信号，并将所述车内声音信号发送至所述多媒体主机及所述功率放大器；
    所述多媒体主机用于获取所述车内声音信号中的语音信号，以进行语音识别；
    所述功率放大器用于获取所述车内声音信号中的噪声信号，并根据所述噪声信号生成降噪音频信号，所述降噪音频信号与所述噪声信号的相位相反；
    所述扬声器模组用于播放所述降噪音频信号。
  2. 根据权利要求1所述的麦克风系统，其特征在于，所述多媒体主机及所述功率放大器均通过汽车音频总线与所述麦克风模组通信连接。
  3. 根据权利要求1或2所述的麦克风系统，其特征在于，所述麦克风模组包括通过汽车音频总线串接的多个麦克风，每个所述麦克风对应安装在车内的目标区域。
  4. 根据权利要求3所述的麦克风系统，其特征在于，每个所述麦克风在20Hz-10KHz的频率区间内具有平坦的频响曲线。
  5. 根据权利要求3所述的麦克风系统，其特征在于，车内每个座位区域对应设置至少1个所述麦克风。
  6. 根据权利要求1-5任一项所述的麦克风系统，其特征在于，所述多媒体主机还用于将多媒体音频信号经由所述麦克风模组发送至所述功率放大器，以供所述功率放大器驱动所述扬声器模组播放所述多媒体音频信号对应的多媒体音频。
  7. 根据权利要求6所述的麦克风系统，其特征在于，所述功率放大器包括：
    主动降噪模块，用于获取所述车内声音信号中的噪声信号，并根据所述噪声信号生成所述降噪音频信号；
    第一数字信号处理器，用于根据所述多媒体音频信号及所述降噪音频信号，生成音频总信号；
    驱动模块，用于根据所述音频总信号控制所述扬声器模组播放音频。
  8. 根据权利要求7所述的麦克风系统，其特征在于，所述功率放大器，还用于将所述音频总信号经由所述麦克风模组转发至所述多媒体主机；
    所述多媒体主机，具体用于根据所述音频总信号及所述车内声音信号，获得所述语音信号。
  9. 根据权利要求7所述的麦克风系统，其特征在于，所述多媒体主机包括：
    第二数字信号处理器，用于获取所述车内声音信号中的人声信号；
    片上系统，用于根据所述人声信号及所述音频总信号，确定所述语音信号，并在获取到所述语音信号时，生成控制指令，所述控制指令用于暂停播放所述多媒体音频，并唤醒语音识别功能。
  10. 一种控制方法，其特征在于，应用于麦克风模组，所述麦克风模组与多媒体主机及功率放大器通信连接；所述方法包括：
    获取车内声音信号；
    将所述车内声音信号发送至所述多媒体主机，以供所述多媒体主机获取所述车内声音信号中的语音信号；
    将所述车内声音信号发送至所述功率放大器，以供所述功率放大器获取所述车内声音信号中的噪声信号，并根据所述噪声信号生成供所述扬声器模组播放的降噪音频。
  11. 根据权利要求10所述的方法，其特征在于，所述方法还包括：
    将所述多媒体主机发出的多媒体音频信号转发至所述功率放大器，以供所述功率放大器驱动所述扬声器模组播放所述多媒体音频信号对应的多媒体音频。
  12. 根据权利要求11所述的方法，其特征在于，所述方法还包括：
    将所述功率放大器发出的音频总信号转发至所述多媒体主机，以供所述多媒体主机根据所述音频总信号及所述车内声音信号，确定所述语音信号。
  13. 一种车辆，其特征在于，所述车辆包括如权利要求1～9任一所述的麦克风系统。
  14. 一种计算处理设备，其特征在于，包括：
    存储器，其中存储有计算机可读代码；以及
    一个或多个处理器，当所述计算机可读代码被所述一个或多个处理器执行时，所述计算处理设备执行如权利要求10-12中任一项所述的控制方法。
  15. 一种计算机可读介质，其中，当所述存储介质中的指令由计算处理设备的处理器执行时，使得所述计算处理设备能够执行权利要求10-12中任一项所述的控制方法。
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