CN111739504A - Microphone system, control method and vehicle - Google Patents
Microphone system, control method and vehicle Download PDFInfo
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- G—PHYSICS
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- 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
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- 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
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- 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
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- G—PHYSICS
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- 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
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- 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
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- G10L15/22—Procedures used during a speech recognition process, e.g. man-machine dialogue
- G10L2015/223—Execution procedure of a spoken command
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Abstract
The invention provides a microphone system, a control method and a vehicle, wherein the system comprises a microphone module, a multimedia host and a power amplifier, the multimedia host and the power amplifier are in communication connection with the microphone module, and the power amplifier is also electrically connected with a loudspeaker module. In the embodiment of the invention, the voice microphone and the noise reduction microphone are not required to be arranged separately to collect the voice signal and the noise signal respectively, and the voice signals are transmitted between the microphone module and the multimedia host and between the microphone module and the power amplifier based on communication connection, so that a large number of connection wiring harnesses can be reduced.
Description
Technical Field
The invention relates to the technical field of automobiles, in particular to a microphone system, a control method and a vehicle.
Background
Currently, in order to implement the functions of noise reduction and voice recognition in a vehicle, two sets of microphones are required to be arranged in the vehicle. One group of microphones is used for positioning sound sources of different sound areas, and then multiple paths of audio frequencies are alternately combined into one path of audio signal according to sampling points and transmitted to a host computer for voice signal processing; and the other group of microphones is used for acquiring the noise in the vehicle, sending the noise to the power amplifier noise reduction module for analysis and processing, and generating reverse sound waves through the loudspeaker in the vehicle to offset the noise of the engine, thereby realizing the noise reduction effect.
Taking four cars as an example, the sound zones are divided as shown in fig. 1, and each seat area is divided into one sound zone; in order to achieve the functions of active noise reduction and sound field division, at least 8 microphones, namely 4 voice microphones and 4 noise reduction microphones, need to be arranged in the vehicle, namely at least one voice microphone and one noise reduction microphone are respectively arranged in each sound zone and used for respectively collecting sound signals with different frequencies and sending the sound signals to the active noise reduction assembly of the host voice module and the power amplifier for sound analysis processing.
In order to realize the collection and transmission of the sound signals, a large number of microphones and wire harnesses are needed, so that the cost of the whole vehicle is increased, a large amount of space in the vehicle is occupied, the assembly operation is complicated, the ElectroMagnetic Compatibility (EMC) of the whole vehicle is difficult to meet the requirements, and the influence on each functional module is large. As shown in fig. 2, fig. 2 is a schematic diagram illustrating a connection of a wire harness for implementing a noise reduction function by a microphone in a conventional manner. In addition, because the frequency ranges of the collected audio signals of the voice microphone and the noise reduction microphone are different, the performance requirements of the traditional mode of realizing the noise reduction function through the microphone on the microphone are very strict, and the cost of the whole vehicle is further increased.
Disclosure of Invention
In view of the above, the present invention is directed to a microphone system, a control method, and a vehicle, so as to solve the problems in the prior art that in order to implement an in-vehicle active noise reduction and sound field segmentation function, a voice microphone and a noise reduction microphone need to be simultaneously installed, and a large number of wire harnesses are required to connect, which is easy to increase the cost and occupy a large amount of in-vehicle space.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a microphone system comprises a microphone module, a multimedia host and a power amplifier, wherein the multimedia host and the power amplifier are in communication connection with the microphone module, and the power amplifier is also electrically connected with a loudspeaker module;
the microphone module is used for acquiring in-vehicle sound signals and sending the in-vehicle sound signals to the multimedia host and the power amplifier;
the multimedia host is used for acquiring a voice signal in the in-vehicle sound signal so as to perform voice recognition;
the power amplifier is used for acquiring a noise signal in the sound signal in the vehicle and generating a noise reduction audio signal according to the noise signal, wherein the phase of the noise reduction audio signal is opposite to that of the noise signal;
the loudspeaker module is used for playing the noise reduction audio signal.
Furthermore, in the microphone system, the multimedia host and the power amplifier are in communication connection with the microphone module through an automobile audio bus.
Furthermore, in the microphone system, the microphone module comprises a plurality of microphones connected in series through an automobile audio bus, and each microphone is correspondingly installed in a target area in an automobile.
Further, in the microphone system, each microphone has a flat frequency response curve in a frequency interval of 20Hz-10 KHz.
Furthermore, in the microphone system, at least 1 microphone is correspondingly arranged in each seat area in the vehicle.
Further, in the microphone system, the multimedia host is further configured to send a multimedia audio signal to the power amplifier via the microphone module, so that the power amplifier drives the speaker module to play a multimedia audio corresponding to the multimedia audio signal.
Further, in the microphone system, the power amplifier includes:
the active noise reduction module is used for acquiring a noise signal in the sound signal in the vehicle and generating the noise reduction audio signal according to the noise signal;
the first digital signal processor is used for generating an audio total signal according to the multimedia audio signal and the noise reduction audio signal;
and the driving module is used for controlling the loudspeaker module to play audio according to the audio total signal.
Further, in the microphone system, the power amplifier is further configured 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 audio total signal and the in-vehicle sound signal.
Further, in the microphone system, the multimedia host includes:
the second digital signal processor is used for acquiring a human voice signal in the sound signal in the vehicle;
and the system on chip is used for determining the voice signal according to the human voice signal and the audio total signal, and generating a control instruction when the voice signal is obtained, wherein the control instruction is used for pausing playing of the multimedia audio and awakening a voice recognition function.
Another objective of the present invention is to provide a control method, wherein the control method is applied to a microphone module, and the microphone module is communicatively connected to a multimedia host and a power amplifier; the method comprises the following steps:
acquiring an in-vehicle sound signal;
sending the in-vehicle sound signal to the multimedia host machine so that the multimedia host machine can obtain a voice signal in the in-vehicle sound signal;
and sending the in-vehicle sound signal to the power amplifier so that the power amplifier can obtain a noise signal in the in-vehicle sound signal, and generating a noise reduction audio frequency for playing by the loudspeaker module according to the noise signal.
Further, the method further comprises:
and forwarding the multimedia audio signal sent by the multimedia host to the power amplifier so that the power amplifier drives the loudspeaker module to play the multimedia audio signal.
Further, the method further comprises:
and forwarding the total audio signal sent by the power amplifier 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.
Compared with the prior art, the microphone system and the control method have the following advantages:
the multimedia host and the power amplifier are in communication connection 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 communication connection, and the multimedia host can realize voice recognition by acquiring voice signals in the in-vehicle sound signals; the power amplifier acquires a noise signal in the sound signal in the vehicle, generates a noise reduction audio signal for the loudspeaker module to play according to the noise signal, and plays the noise reduction audio signal by the loudspeaker module, so that the noise reduction effect can be achieved. Because the voice microphone and the noise reduction microphone are not required to be independently arranged to respectively collect voice signals and noise signals, and audio signal transmission is carried out between the microphone module and the multimedia host and between the microphone module and the power amplifier based on communication connection, a large number of connecting wire harnesses can be reduced, the cost of the whole vehicle is reduced, the space in the vehicle can be saved, and the assembly operation steps are simplified, so that the problems that in the prior art, in order to realize the functions of active noise reduction and sound field division in the vehicle, the voice microphone and the noise reduction microphone are required to be simultaneously arranged and more wire harnesses are required to be connected, the cost is easily increased, and a large amount of space in the vehicle is occupied are solved.
It is a further object of the invention to propose a vehicle, wherein the vehicle comprises said microphone system.
The vehicle has the same advantages as the microphone system described above with respect to the prior art, and will not be described herein again.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic view of a sound field partition;
FIG. 2 is a schematic diagram of a wire harness connection for implementing a noise reduction function via a microphone in a conventional manner;
fig. 3 is a schematic structural diagram of a microphone system according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of microphone concatenation and signal transmission according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of an in-vehicle sound signal collected by a microphone according to an embodiment of the present invention;
FIG. 6 is a schematic diagram of a transmission path for uplink transmission of an audio signal according to an embodiment of the present invention;
FIG. 7 is a diagram of transmission paths for upstream transmission of audio signals according to an embodiment of the present invention;
FIG. 8 is a graph of the frequency response of a microphone in an embodiment of the present invention;
fig. 9 is a signal processing flow chart of a microphone system according to an embodiment of the present invention;
fig. 10 is a schematic diagram of a hardware structure of a microphone system according to an embodiment of the present invention.
Detailed Description
Embodiments of the present application will be described in more detail below with reference to the accompanying drawings. While embodiments of the present application are illustrated in the accompanying drawings, it should be understood that the present application may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
Referring to fig. 3, a schematic structural diagram of a microphone system according to an embodiment of the present invention is shown, wherein the microphone system includes a microphone module 10, a multimedia host 20 and a power amplifier 30, the multimedia host 20 and the power amplifier 30 are both in communication connection with the microphone module 10, and the power amplifier 30 is further electrically connected with a speaker module 40; the microphone module 10 is configured to obtain an in-vehicle sound signal and send the in-vehicle sound signal to the multimedia host 20 and the power amplifier 30; the multimedia host 20 is configured to obtain a voice signal in the in-vehicle sound signal for voice recognition; the power amplifier 30 is configured to obtain a noise signal in the in-vehicle sound signal, and generate a noise reduction audio signal for the speaker module 40 to play according to the noise signal, where the phase of the noise reduction audio signal is opposite to that of the noise signal; the loudspeaker module is used for playing the noise reduction audio according to the noise reduction audio signal.
In the embodiment of the present invention, the microphone module 10 can acquire the sound signal in the vehicle, and meanwhile, because the multimedia host 20 and the power amplifier 30 are both in communication connection with the microphone module 10, the microphone module 10 can send the sound signal in the vehicle to the multimedia host 20 and the power amplifier 30 based on the communication connection, and the multimedia host 20 can realize the voice recognition by acquiring the voice signal in the sound signal in the vehicle; the power amplifier 30 obtains the noise signal in the in-vehicle sound signal, and generates a noise reduction audio signal for the speaker module 40 to play according to the noise signal, and then the speaker module 40 plays the noise reduction audio signal, so as to achieve the effect of noise reduction.
Because the voice microphone and the noise reduction microphone are not required to be arranged independently to collect voice signals and noise signals respectively, and audio signal transmission is carried out between the microphone module 10 and the multimedia host 20 and between the microphone module 10 and the power amplifier 30 based on communication connection, and because the audio signal transmission is carried out based on communication connection, the audio signals can simultaneously go up and down, a large number of connecting wire harnesses can be reduced, the cost of the whole vehicle is reduced, the space in the vehicle can be saved, and the assembly operation steps can be simplified.
In the microphone system provided in the embodiment of the present invention, the microphone module 10 and the multimedia host 20 may perform uplink transmission and downlink transmission of audio signals, that is, the audio signals may be transmitted from the microphone module 10 to the multimedia host 20, or may be transmitted from the multimedia host 20 to the microphone module 10; the microphone module 10 and the power amplifier 30 may also perform uplink transmission and downlink transmission of audio signals, that is, the audio signals may be transmitted from the microphone module 10 to the power amplifier 30, or from the power amplifier 30 to the microphone module 10;
the multimedia host 20 and the power amplifier 30 can communicate with each other based on the microphone module 10, that is, the microphone module 10 is used as a bridge to realize uplink transmission and downlink transmission of audio signals between the power amplifier 30 and the multimedia host 20, that is, the audio signals can be transmitted from the power amplifier 30 to the multimedia host 20 through the microphone module 10, or transmitted from the multimedia host 20 to the power amplifier 30 through the microphone module 10, and then transmitted to the speaker module 40 by the power amplifier 30 for playing.
Specifically, in order to perform uplink transmission and downlink transmission of audio signals between the microphone module 10 and the multimedia host 20, a first uplink communication link 101 and a first downlink communication link 102 need to be established between the microphone module 10 and the multimedia host 20, where the first uplink communication link 101 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 to the microphone module 10; in order to perform uplink transmission and downlink transmission of audio signals between the microphone module 10 and the power amplifier 30, a second uplink communication link 103 and a second downlink communication link 104 need 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 the audio signals to the power amplifier 30, and the second uplink communication link 103 is used for the power amplifier 30 to transmit the audio signals to the microphone module 10.
Optionally, the multimedia host 20 and the power amplifier 30 are both communicatively connected to the microphone module 10 via a car audio bus (A2B), so that there are uplink and downlink channels between the multimedia host 20 and the microphone module 10 and between the power amplifier 30 and the microphone module 10, which correspond 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 104, so that only one car audio bus connecting the multimedia host 20 and the microphone module 10 and one car audio bus connecting the power amplifier 30 and the microphone module 10 are needed, therefore, the audio signal transmission among the multimedia host 20, the microphone module 10 and the power amplifier 30 can be realized, the use of wire harnesses can be greatly reduced, and the transmission efficiency of signals can be improved.
Specifically, the multimedia host 20, the microphone module 10 and the power amplifier 30 all use an A2B interface to realize the transmission of audio signals. In addition, the multimedia host 20 chip, the microphone module 10 chip and the power amplifier 30 chip need to support the A2B transmission protocol.
Optionally, the microphone module 10 includes a plurality of microphones connected in series through an automobile audio bus, and each of the microphones is correspondingly installed in a target area in an automobile, so that each of the microphones can acquire an in-automobile sound signal of the target area corresponding to the microphone module, and then the microphone module 10 can upload the in-automobile sound signal to the multimedia host 20 through the automobile audio bus and downlink the in-automobile sound signal to the power amplifier 30, and then the multimedia host 20 performs voice recognition by acquiring the voice signal therein, and the power amplifier 30 acquires the noise signal therein to perform noise reduction processing.
In an embodiment of the present invention, the speaker module 40 includes a plurality of speakers. In order to achieve the purpose of targeted noise reduction, at least one speaker should be disposed at a target area corresponding to each microphone, so that noise reduction audio corresponding to a noise signal at the target area is played through the speaker to achieve a noise reduction effect.
In practical applications, because the speaker needs to be controlled to play the noise reduction audio corresponding to the noise signal at the target area to achieve the noise reduction effect, it is necessary to collect the noises of different seats and different sound zones from the area.
Taking 4 microphones as an example, when the in-vehicle audio signal goes up, the in-vehicle audio signal is transmitted from the microphone module 10 to the multimedia host 20(HUT), the microphone on the side close to the power Amplifier 30 (AMP) is defined as 00, and the microphones transmitted to the multimedia host 20 end are defined as 00,01,02,03 in sequence; when the in-vehicle audio signal goes down, the in-vehicle audio signal is transmitted from the digital microphone to the power amplifier 30, the number of the microphone near the multimedia host may be defined as 00, and the number of the microphone transmitting the signal to the power amplifier 30 may be defined as 00,01,02,03, in this order. Specifically, as shown in fig. 4, fig. 4 shows a schematic diagram of microphone concatenation and signal transmission.
The microphones are connected through plug connectors P and automobile audio wire harnesses, two wires are arranged in each wire harness, one wire is used for uplink transmission, and the other wire is used for downlink transmission. The Q1 is a microphone signal transmission wire harness used for transmitting the sound signal collected by the microphone to the plug connector; q2 is the transmission line beam between the microphones, is used for conducting adjacent microphones, forms the transmission link.
When the 4 microphones collect the sound signals in the vehicle, the microphone closer to the sound source collects the sound signals in the vehicle earlier, and the microphone farther from the sound source collects the sound signals in the vehicle later; the sound signals in the vehicle collected by the 4 microphones are shown in fig. 5; after the in-vehicle sound signals are transmitted to the voice module of the multimedia host 20, the in-vehicle sound signals collected by the 4 microphones are distinguished according to the sequence of transmitting sound waves and correspond to the seats, and sound source partitioning is completed; after the in-vehicle sound signals are transmitted to the noise reduction module of the power player, the in-vehicle sound signals collected by the 4 microphones are distinguished according to the sequence of transmitting sound waves and correspond to seats, sound source partitioning is completed, and noise reduction audio signals for all sound zones are generated.
Specifically, when the audio signal goes upstream, i.e., the audio signal is transmitted from the power amplifier 30 to the multimedia host 20, the audio signal follows the sequence numbers ① - ② - ③ - ④ - ⑤ - ⑥ - ⑦ - ⑧ - ⑨ - ⑩ in FIG. 6
The represented car audio bus, and when the audio signal goes upward, i.e. the audio signal is transmitted from the power amplifier 30 to the multimedia host 20, the audio signal follows the sequence numbers ① - ② - ③ - ④ - ⑤ - ⑥ - ⑦ - ⑧ - ⑨ - ⑩ in FIG. 7
The represented car audio bus.
Optionally, at least 1 of the microphones may be provided in the vehicle for each seating area in order to create a good riding experience for the occupant at each seating and to recognize the voice command of the occupant at each seating.
The in-vehicle sound mainly includes a voice spoken by an on-vehicle person, an engine noise, and a multimedia sound played by the speaker module 40, and because the engine noise has a characteristic that a frequency is in a 20Hz-3KHz frequency band and an irregular noise wave, and the voice has a frequency in a 100Hz-10KHz frequency band and a sound wave has a certain rule, in order to achieve voice recognition and noise reduction effects, the microphones are required to have a capability of acquiring a voice signal and an engine noise signal at the same time, so each of the microphones has a flat frequency response curve in a frequency interval of 20Hz-10KHz, as shown in fig. 8 in particular, so that the microphones can acquire the voice signal and the noise signal at the same time and transmit the voice signal and the noise signal to the multimedia host 20 and the power amplifier 30 through A2B to perform voice signal analysis processing.
Specifically, the multimedia host 20 is further configured to send a multimedia audio signal to the power amplifier 30 through the microphone module 10, so that the power amplifier 30 drives the speaker module 40 to play a multimedia audio corresponding to the multimedia audio signal. In the embodiment of the present invention, since the multimedia host 20 and the power amplifier 30 are both in communication connection with the microphone module 10 through the car audio bus, a downlink transmission channel between the multimedia host 20 and the microphone module 10 can be used to transmit a multimedia audio signal to the microphone module 10, and then the downlink transmission channel between the microphone module 10 and the power amplifier 30 can be used to transmit the multimedia audio signal to the power amplifier 30, so that the multimedia audio corresponding to the multimedia audio signal can be played through the speaker module 40.
Optionally, in an embodiment, the power amplifier 30 includes:
the active noise reduction module 31 is configured to acquire a noise signal in the in-vehicle sound signal, and generate the noise reduction audio signal according to the noise signal;
the first digital signal processor 32 is configured to generate an audio total signal according to the multimedia audio signal and the noise reduction audio signal, send the audio total signal to a driving module, and forward the audio total signal to the multimedia host 20 through the microphone module 10;
the driving module 33 is configured to control the speaker module 40 to play audio according to the audio total signal;
the multimedia host 20 is specifically configured to determine the voice signal according to the audio total signal and the in-vehicle sound signal.
In this embodiment, the active noise reduction module may be specifically an ANC DSP, which may filter the sound wave with a frequency in a frequency band of 100Hz-10KHz and retain the irregular sound wave with a frequency in a frequency band of 20Hz-3KHz by analyzing the frequency and the regularity of the sound wave of the in-vehicle sound signal transmitted by the microphone module 10, so as to obtain a noise signal in the in-vehicle sound signal, generate the noise reduction audio signal according to the noise signal, and transmit the noise reduction audio signal to the first digital signal processor 32;
in this embodiment, the first digital signal processor 32, which may be specifically a Sigma DSP, may receive a multimedia audio signal transmitted from the multimedia host 20 via the microphone module 10, and receive a noise reduction audio signal generated by the active noise reduction module, mix the received signals to generate an audio total signal, and send the audio total signal to the driving module, so as to drive the speaker to play the audio total signal, so that a noise reduction effect may be achieved while playing the multimedia audio; meanwhile, the first digital signal processor also forwards the total audio signal to the multimedia host 20 through the microphone module 10, so that the multimedia host 20 can accurately identify a voice signal according to the total audio signal and the in-vehicle sound signal;
in this embodiment, the multimedia host 20 specifically uses the human voice signal added to the in-vehicle voice signal compared to the total audio signal as the voice signal corresponding to the target area by comparing the total audio signal with the in-vehicle voice signal, so as to realize voice recognition of the target area.
Optionally, in an embodiment, the multimedia host 20 specifically includes:
the second digital signal processor 21 is configured to obtain a human voice signal in the in-vehicle sound signal;
and the system on chip 22 is configured to determine the voice signal according to the human voice signal and the audio total signal, and generate a control instruction when the voice signal is acquired, where the control instruction is used to pause playing of the multimedia audio and wake up a voice recognition function.
In this embodiment, the second digital signal processor may be specifically a voice DSP, and filters an irregular sound wave with a frequency in a frequency band of 20Hz to 3KHz through an internal signal filter, and retains the sound wave with the frequency in a frequency band of 100Hz to 10KHz, so as to obtain a vocal signal in the in-vehicle sound signal, and forward the vocal signal to the system on chip, so as to determine whether the vocal signal is a voice signal;
in this embodiment, the soc determines whether the total audio signal does not include the voice signal by comparing the voice signal with the total audio signal, and if the voice signal does exist, the voice control instruction issued by the driver and the passenger is indicated, so that a control instruction needs to be generated to suspend playing the multimedia audio, and wake up the voice recognition function to enter the voice recognition state.
In practical applications, please refer to fig. 9, which shows a signal processing flow chart of the microphone system according to the embodiment of the present invention.
As shown in fig. 9, a microphone collects and mixes a voice signal, an engine noise signal and a speaker sound signal in the vehicle into a road vehicle sound signal; the microphone divides the mixed sound signal into two paths of-A and-B through A2B and transmits the two paths of-A and-B to the voice DSP of the multimedia host and the ANC DSP of the power amplifier to analyze and process the audio signal, and respectively obtains a human sound signal and an engine noise signal; the voice DSP of the multimedia host sends the processed voice signal in the second step-A to a System On Chip (SOC);
in step three, the system on chip transmits the multimedia audio to the microphone through A2B; then, in the fourth step, the multimedia audio is transmitted to a Sigma DSP in the power amplifier through the microphone through A2B, the Sigma DSP processes the multimedia audio and the ANC DSP to obtain a noise reduction audio signal, the noise reduction audio signal is converged and then sent to a power amplification chip for small signal amplification, sound is emitted through a loudspeaker, and meanwhile, a feedback signal is sent to the microphone; in step sixthly, the feedback signal is transmitted to the multimedia host through the A2B by the microphone, so that the system on chip compares the voice signal with the feedback signal, determines whether the voice signal does not exist in the total audio signal in the voice signal, if the voice signal exists, the voice control instruction sent by the driver and passenger is described, and therefore a control instruction needs to be generated to pause playing 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.
In practical applications, please refer to fig. 10, which shows a schematic hardware structure diagram of a microphone system according to an embodiment of the present invention. Taking four automobiles as an example, and arranging one microphone on each seat, specifically, sequentially installing a microphone A, a microphone B, a microphone C and a microphone D at the roofs of a main driver seat, a front passenger seat, a right rear seat and a rear seat, connecting the microphone A, the microphone B, the microphone C and the microphone D in series through an automobile audio bus according to the sequence of the main driver seat, the front passenger seat, the right rear seat and the rear seat, connecting the microphone A with a HUT through the automobile audio bus, and connecting the microphone D with a power amplifier through the automobile audio bus, thereby constructing the microphone system.
Another objective of the present invention is to provide a control method, wherein the control method is applied to a microphone module, and the microphone module is communicatively connected to a multimedia host and a power amplifier; the method comprises the following steps:
acquiring an in-vehicle sound signal;
sending the in-vehicle sound signal to the multimedia host machine so that the multimedia host machine can obtain a voice signal in the in-vehicle sound signal;
and sending the in-vehicle sound signal to the power amplifier so that the power amplifier can obtain a noise signal in the in-vehicle sound signal, and generating a noise reduction audio frequency for playing by the loudspeaker module according to the noise signal.
Optionally, in the method, the multimedia host and the power amplifier are both in communication connection with the microphone module through an automobile audio bus.
Optionally, in the method, the microphone module includes a plurality of microphones connected in series through an automobile audio bus, and each of the microphones is correspondingly installed in a target area in an automobile.
Optionally, in the method, each of the microphones has a flat frequency response curve in a frequency interval of 20Hz to 10 KHz.
Optionally, in the method, at least 1 microphone is provided for each seating area in the vehicle.
Optionally, the method further comprises:
and forwarding the multimedia audio signal sent by the multimedia host to the power amplifier so that the power amplifier drives the loudspeaker module to play the multimedia audio signal.
Optionally, the method further comprises:
and forwarding the total audio signal sent by the power amplifier 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.
It is a further object of the invention to propose a vehicle, wherein the vehicle comprises said microphone system.
Technical details and benefits relating to the above-described method and vehicle have been set forth in the above-described system and will not be repeated here.
In summary, according to the microphone system, the control method and the vehicle provided by the application, the multimedia host and the power amplifier are in communication connection 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 communication connection, and the multimedia host can realize voice recognition by acquiring voice signals in the in-vehicle sound signals; the power amplifier acquires a noise signal in the sound signal in the vehicle, generates a noise reduction audio signal for the loudspeaker module to play according to the noise signal, and plays the noise reduction audio signal by the loudspeaker module, so that the noise reduction effect can be achieved. Because the voice microphone and the noise reduction microphone are not required to be independently arranged to respectively collect voice signals and noise signals, and audio signal transmission is carried out between the microphone module and the multimedia host and between the microphone module and the power amplifier based on communication connection, a large number of connecting wire harnesses can be reduced, the cost of the whole vehicle is reduced, the space in the vehicle can be saved, and the assembly operation steps are simplified, so that the problems that in the prior art, in order to realize the functions of active noise reduction and sound field division in the vehicle, the voice microphone and the noise reduction microphone are required to be simultaneously arranged and more wire harnesses are required to be connected, the cost is easily increased, and a large amount of space in the vehicle is occupied are solved.
It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (13)
1. A microphone system is characterized by comprising a microphone module, a multimedia host and a power amplifier, wherein the multimedia host and the power amplifier are in communication connection with the microphone module, and the power amplifier is also electrically connected with a loudspeaker module;
the microphone module is used for acquiring in-vehicle sound signals and sending the in-vehicle sound signals to the multimedia host and the power amplifier;
the multimedia host is used for acquiring a voice signal in the in-vehicle sound signal so as to perform voice recognition;
the power amplifier is used for acquiring a noise signal in the sound signal in the vehicle and generating a noise reduction audio signal according to the noise signal, wherein the phase of the noise reduction audio signal is opposite to that of the noise signal;
the loudspeaker module is used for playing the noise reduction audio signal.
2. The microphone system as defined by claim 1 wherein the multimedia host and the power amplifier are both communicatively coupled to the microphone module via a car audio bus.
3. The microphone system as defined by claim 1 wherein the microphone module comprises a plurality of microphones connected in series via a car audio bus, each of the microphones corresponding to a target area in a car.
4. The microphone system as defined by claim 3 wherein each of the microphones has a flat frequency response curve in the frequency interval of 20Hz-10 KHz.
5. A microphone system according to claim 3, wherein at least 1 said microphone is provided for each seating area in the vehicle.
6. The microphone system as claimed in claim 1, wherein the multimedia host is further configured to send a multimedia audio signal to the power amplifier via the microphone module, so that the power amplifier drives the speaker module to play a multimedia audio corresponding to the multimedia audio signal.
7. The microphone system of claim 6, wherein the power amplifier comprises:
the active noise reduction module is used for acquiring a noise signal in the sound signal in the vehicle and generating the noise reduction audio signal according to the noise signal;
the first digital signal processor is used for generating an audio total signal according to the multimedia audio signal and the noise reduction audio signal;
and the driving module is used for controlling the loudspeaker module to play audio according to the audio total signal.
8. The microphone system as defined by claim 7 wherein the power amplifier is further configured 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 audio total signal and the in-vehicle sound signal.
9. The microphone system as defined by claim 7 wherein the multimedia host comprises:
the second digital signal processor is used for acquiring a human voice signal in the sound signal in the vehicle;
and the system on chip is used for determining the voice signal according to the human voice signal and the audio total signal, and generating a control instruction when the voice signal is obtained, wherein the control instruction is used for pausing playing of the multimedia audio and awakening a voice recognition function.
10. A control method is characterized by being applied to a microphone module, wherein the microphone module is in communication connection with a multimedia host and a power amplifier; the method comprises the following steps:
acquiring an in-vehicle sound signal;
sending the in-vehicle sound signal to the multimedia host machine so that the multimedia host machine can obtain a voice signal in the in-vehicle sound signal;
and sending the in-vehicle sound signal to the power amplifier so that the power amplifier can obtain a noise signal in the in-vehicle sound signal, and generating a noise reduction audio frequency for playing by the loudspeaker module according to the noise signal.
11. The method of claim 10, further comprising:
and forwarding the multimedia audio signal sent by the multimedia host to the power amplifier so that the power amplifier drives the loudspeaker module to play the multimedia audio corresponding to the multimedia audio signal.
12. The method of claim 11, further comprising:
and forwarding the total audio signal sent by the power amplifier 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.
13. A vehicle, characterized in that the vehicle comprises a microphone system according to any of claims 1-8.
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| CN202010478606.1A CN111739504B (en) | 2020-05-29 | 2020-05-29 | Microphone system, control method and vehicle |
| PCT/CN2021/096282 WO2021239044A1 (en) | 2020-05-29 | 2021-05-27 | Microphone system, control method and vehicle |
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| CN202010478606.1A CN111739504B (en) | 2020-05-29 | 2020-05-29 | Microphone system, control method and vehicle |
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| CN111739504B CN111739504B (en) | 2024-06-11 |
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| WO2021239044A1 (en) | 2021-12-02 |
| CN111739504B (en) | 2024-06-11 |
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