CN109360578B - Echo cancellation method of audio device, audio device and readable storage medium - Google Patents
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- G10L21/00—Speech or voice signal processing techniques to produce another audible or non-audible signal, e.g. visual or tactile, in order to modify its quality or its intelligibility
- G10L21/02—Speech enhancement, e.g. noise reduction or echo cancellation
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- G10L21/00—Speech or voice signal processing techniques to produce another audible or non-audible signal, e.g. visual or tactile, in order to modify its quality or its intelligibility
- G10L21/02—Speech enhancement, e.g. noise reduction or echo cancellation
- G10L21/0208—Noise filtering
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- G10L21/00—Speech or voice signal processing techniques to produce another audible or non-audible signal, e.g. visual or tactile, in order to modify its quality or its intelligibility
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- G10L21/0208—Noise filtering
- G10L21/0216—Noise filtering characterised by the method used for estimating noise
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Abstract
The invention discloses an echo cancellation method of audio equipment, which comprises the following steps: acquiring a sound signal received by a microphone of the audio equipment; performing frequency compensation processing on the sound signal; carrying out echo cancellation on the sound signal subjected to the frequency compensation processing; and performing frequency compensation removal processing on the sound signal subjected to echo cancellation to obtain a target signal in the sound signal. The invention also discloses audio equipment and a computer readable storage medium. The invention can reduce the influence on echo cancellation when the sound signal received by the microphone of the audio equipment is distorted.
Description
Technical Field
The present invention relates to the field of audio technologies, and in particular, to an echo cancellation method for an audio device, and a computer-readable storage medium.
Background
At present, in a microphone array applied to audio equipment such as an intelligent sound box, frequency responses of loudspeaker signals received by all microphones are different, and particularly, in a microphone behind the loudspeaker, a valley point is easily generated in a certain frequency band by the frequency response of the received loudspeaker signals. Therefore, in addition, the noise generated by the intelligent sound box can cause the intelligent sound box to generate serious distortion. At this time, when the echo cancellation algorithm is used to process the sound, for such a relatively serious distortion, the algorithm is easily misjudged or the processing precision is affected, thereby affecting the echo cancellation effect.
Disclosure of Invention
The invention mainly aims to provide an echo cancellation method of an audio device, the audio device and a computer readable storage medium, aiming at reducing the influence on echo cancellation when a sound signal received by a microphone of the audio device is distorted.
In order to achieve the above object, the present invention provides an echo cancellation method for an audio device, including the steps of:
acquiring a sound signal received by a microphone of the audio equipment;
performing frequency compensation processing on the sound signal;
carrying out echo cancellation on the sound signal subjected to the frequency compensation processing;
and performing frequency compensation removal processing on the sound signal subjected to echo cancellation to obtain a target signal in the sound signal.
Preferably, the microphone is a microphone array, the audio device further has a speaker, and the step of performing frequency compensation processing on the sound signal includes:
acquiring frequency responses from the loudspeaker to all microphones in the microphone array and preset frequency responses from the loudspeaker to a preset reference microphone;
calculating the difference between the preset frequency response and each frequency response;
and according to the difference, carrying out frequency compensation on the sound signals correspondingly received by the microphones.
Preferably, the step of performing frequency compensation removal processing on the sound signal after echo cancellation to obtain a target signal in the sound signal includes:
taking the negative value of the difference value;
and according to the negative value of the difference, performing frequency compensation removal processing on the sound signal subjected to echo cancellation to obtain a target signal in the sound signal.
Preferably, the step of performing echo cancellation on the sound signal after the frequency compensation processing further includes:
carrying out equalization processing on the sound signal subjected to echo cancellation according to preset equalization parameters;
and performing frequency compensation removal processing on the sound signal subjected to the equalization processing to obtain a target signal in the sound signal.
Preferably, the step of performing frequency compensation removal processing on the sound signal after echo cancellation to obtain a target signal in the sound signal further includes:
and carrying out array processing and/or voice recognition processing on the target signal.
Preferably, the echo cancellation method of the audio device further includes:
when the target signal is subjected to voice recognition processing, judging whether a preset awakening instruction exists in the target signal;
and if so, controlling the audio equipment to be in a wake-up state.
Preferably, when the microphone is a microphone array, one or a predetermined number of microphones in the microphone array are in an operating state before the audio device is in an awake state.
Preferably, if the audio device exists, the step of controlling the audio device to be in the wake-up state includes:
and controlling the microphones in the non-working state in the microphone array to be switched to the working state.
To achieve the above object, the present invention further provides an audio device, which includes a processor and an echo cancellation program of the audio device stored in the processor and operable on the processor, wherein the echo cancellation program of the audio device, when executed by the processor, implements the steps of the echo cancellation method of the audio device as described above.
To achieve the above object, the present invention also provides a computer-readable storage medium having stored thereon an echo cancellation program of an audio device, the echo cancellation program of the audio device being executed by a processor to implement the steps of the echo cancellation method of the audio device as described above.
According to the echo cancellation method of the audio device, the audio device and the computer readable storage medium provided by the invention, the target signal in the sound signal is obtained by acquiring the sound signal received by the microphone of the audio device, then performing frequency compensation processing on the sound signal, then performing echo cancellation on the sound signal after the frequency compensation processing, and finally performing frequency compensation removal processing on the sound signal after the echo cancellation. In this way, the influence on echo cancellation can be reduced when the sound signal received by the microphone of the audio device is distorted.
Drawings
FIG. 1 is a schematic diagram of an audio device in a hardware operating environment according to an embodiment of the present invention;
FIG. 2 is a flowchart illustrating a first embodiment of an echo cancellation method of an audio device according to the present invention;
FIG. 3 is a detailed flowchart of step S2 in FIG. 2;
FIG. 4 is a detailed flowchart of step S4 in FIG. 2;
fig. 5 is a flowchart illustrating an echo cancellation method of an audio device according to a second embodiment of the present invention.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
As shown in fig. 1, the audio apparatus of the present invention includes: a processor 1001, such as a CPU, a user interface 1002, memory 1003, a communication bus 1004, a speaker 1005, and a microphone 1006. Wherein a communication bus 1004 is used to enable connective communication between these components. The user interface 1002 may include an input unit. The speaker 1005 is used for playing sound signals, and the microphone 1006 is used for receiving signals sent by the speaker, voice signals triggered by a user, and the like.
The memory 1003 may be a high-speed RAM memory or a non-volatile memory (e.g., a disk memory). The memory 1003 may alternatively be a storage device separate from the processor 1001.
Those skilled in the art will appreciate that the audio device shown in fig. 1 does not constitute a limitation of the audio device and may include more or fewer components than those shown, or some components may be combined, or a different arrangement of components.
The memory 1003, which is a kind of computer storage medium, may include therein an operating system, a network communication module, a user interface module, and an echo cancellation program of an audio device.
The user interface 1002 is mainly used for receiving a user instruction triggered by a user input instruction through an input unit; the processor 1001 is configured to call an echo cancellation program of the audio device stored in the memory 1003, and perform the following operations:
acquiring a sound signal received by a microphone of the audio equipment;
performing frequency compensation processing on the sound signal;
carrying out echo cancellation on the sound signal subjected to the frequency compensation processing;
and performing frequency compensation removal processing on the sound signal subjected to echo cancellation to obtain a target signal in the sound signal.
Further, the processor 1001 may call the echo cancellation program of the audio device stored in the memory 1003, and further perform the following operations:
acquiring frequency responses from the loudspeaker to all microphones in the microphone array and preset frequency responses from the loudspeaker to a preset reference microphone;
calculating the difference between the preset frequency response and each frequency response;
and according to the difference, carrying out frequency compensation on the sound signals correspondingly received by the microphones.
Further, the processor 1001 may call the echo cancellation program of the audio device stored in the memory 1003, and further perform the following operations:
taking the negative value of the difference value;
and according to the negative value of the difference, performing frequency compensation removal processing on the sound signal subjected to echo cancellation to obtain a target signal in the sound signal.
Further, the processor 1001 may call the echo cancellation program of the audio device stored in the memory 1003, and further perform the following operations:
carrying out equalization processing on the sound signal subjected to echo cancellation according to preset equalization parameters;
and performing frequency compensation removal processing on the sound signal subjected to the equalization processing to obtain a target signal in the sound signal.
Further, the processor 1001 may call the echo cancellation program of the audio device stored in the memory 1003, and further perform the following operations:
and carrying out array processing and/or voice recognition processing on the target signal.
Further, the processor 1001 may call the echo cancellation program of the audio device stored in the memory 1003, and further perform the following operations:
when the target signal is subjected to voice recognition processing, judging whether a preset awakening instruction exists in the target signal;
and if so, controlling the audio equipment to be in a wake-up state.
Further, the processor 1001 may call the echo cancellation program of the audio device stored in the memory 1003, and further perform the following operations:
when the microphones are microphone arrays, one or a predetermined number of microphones in the microphone arrays are in a working state before the audio device is in a wake-up state.
Further, the processor 1001 may call the echo cancellation program of the audio device stored in the memory 1003, and further perform the following operations:
and controlling the microphones in the non-working state in the microphone array to be switched to the working state.
Referring to fig. 2, in a first embodiment, the present invention provides an echo cancellation method of an audio device, including the steps of:
step S1, acquiring a sound signal received by a microphone of the audio equipment;
in this embodiment, the audio device may be an intelligent sound box, or may be a mobile phone or other playback device with radio and sound reproduction functions. The audio device comprises a microphone and a loudspeaker, wherein the microphone can be a single microphone or a microphone array formed by a plurality of microphones. The sound signals received by the microphone comprise signals sent by the loudspeaker, voice signals triggered by a user and the like. Of course, the sound signal may also include noise generated by the audio device itself, and noise of the environment in which the audio device is located.
It can be understood that, when the microphone is a microphone array, 1 or more microphones can be preset to collect sound signals in real time or at regular time, and when the audio device is awakened and needs to accurately receive a user voice instruction, the audio device is switched to a working state in time with all the microphones, so that the operation amount and the power consumption of the audio device in the voice recognition process can be reduced; of course, the sound signal may also be collected by all microphones of the microphone array.
Step S2, performing frequency compensation processing on the sound signal;
in this embodiment, assuming that the microphone generates distortion when the frequency is 5000Hz, the frequency response at this position may be subjected to frequency compensation processing to increase the fundamental frequency response at this position, so as to reduce the distortion, thereby reducing the influence of the distortion on echo cancellation.
Step S3, echo cancellation is carried out on the sound signal after frequency compensation processing;
in this embodiment, an adaptive filtering method may be used at the microphone to perform echo cancellation processing; an acoustic echo control algorithm may also be used for echo cancellation. Of course, the embodiment does not limit the specific algorithm adopted for echo cancellation, but can be reasonably selected according to actual needs. In this embodiment, before echo cancellation, beam forming, noise suppression, dereverberation, nonlinear processing, and the like may be used to perform noise cancellation.
And step S4, performing frequency compensation removal processing on the sound signal after echo cancellation to obtain a target signal in the sound signal.
In this embodiment, after performing echo cancellation on the sound signal after the frequency compensation processing, a signal or the like sent by a speaker in the sound signal may be filtered, and at this time, by performing frequency compensation removal processing on the sound signal after the echo cancellation, the frequency compensation operation may be prevented from affecting and interfering with a voice signal triggered by a user in the sound signal.
The echo cancellation method of the audio device provided by the invention obtains the sound signal received by the microphone of the audio device, then carries out frequency compensation processing on the sound signal, carries out echo cancellation on the sound signal after the frequency compensation processing, and finally carries out frequency compensation removal processing on the sound signal after the echo cancellation, thereby obtaining the target signal in the sound signal. In this way, the influence on echo cancellation can be reduced when the sound signal received by the microphone of the audio device is distorted.
Referring to fig. 3, in the second embodiment, based on the first embodiment, the step S2 includes:
step S21, acquiring frequency responses from the loudspeaker to each microphone in the microphone array and preset frequency responses from the loudspeaker to a preset reference microphone;
in this embodiment, the microphones are microphone arrays, each of the microphone arrays includes N microphones, and the frequency response P from the speaker to each of the microphones of the audio device is detected1、P2、P3···PN. The preset reference microphone is an external microphone, and the preset frequency response is data measured through a preset experiment.
Step S22, calculating the difference between the preset frequency response and each frequency response;
and step S23, performing frequency compensation on the sound signals correspondingly received by the microphones according to the difference.
In this embodiment, the preset frequency response P and each of the frequency responses P are calculatedNThe difference between the two is P-PNThen according to the calculated difference value P-PNAnd performing frequency compensation on the sound signals correspondingly received by the microphones, namely adding the corresponding difference values to the sound signals correspondingly received by the microphones respectively to perform corresponding frequency compensation.
In the embodiment, by performing frequency compensation processing on the sound signals received by each microphone in the microphone array, distortion influence caused by the fact that the microphone generates a valley point in some frequency bands can be reduced.
It will be appreciated that this scheme may also be used for frequency compensation when there is only one microphone. At this time, the corresponding N is 1. The detailed scheme is the same as above, and is not described herein again.
Referring to fig. 4, in the third embodiment, based on the second embodiment, the step S4 includes:
step S41, taking the negative value of the difference;
and step S42, according to the negative value of the difference, performing frequency compensation removal processing on the sound signal after echo cancellation to obtain a target signal in the sound signal.
In this embodiment, the negative value of the difference, i.e., P, is takenN-P, then according to the negative value P of said differenceNAnd P, performing frequency compensation removal processing on the sound signal subjected to echo cancellation, that is, adding a negative value of the corresponding difference to the sound signal subjected to echo cancellation by each microphone, so as to remove the corresponding frequency compensation. In this way, the above frequency compensation operation can be prevented from affecting and interfering with the user-triggered speech signal in the sound signal.
It will be appreciated that this scheme may also be used to perform frequency de-compensation when there is only one microphone. At this time, the corresponding N is 1. The detailed scheme is the same as above, and is not described herein again.
Referring to fig. 5, in the fourth embodiment, based on any of the above embodiments, the step S3 is further followed by:
step S5, carrying out equalization processing on the sound signal after echo cancellation according to preset equalization parameters;
and step S6, performing frequency compensation removal processing on the sound signal subjected to the equalization processing to obtain a target signal in the sound signal.
In this embodiment, the frequency of the gain factor related to the frequency is adjusted, and the acoustic signal after echo cancellation is equalized by presetting equalization parameters, so that frequency distortion in the target signal can be avoided.
The embodiment can automatically equalize the sound signal after echo cancellation according to preset equalization parameters, and can also provide an operable interface for a user, and specifically, an adjustable parameter interface can be displayed for the user through an application interface of a mobile terminal such as a mobile phone, so that the user can perform personalized setting according to own preferences.
Based on any of the above embodiments, when the target signal is obtained, the target signal may be subjected to array processing and/or speech recognition processing. Specifically, the array processing is mainly used to determine the direction and position of sound through sound signals received by a plurality of microphones. The speech recognition process is mainly used to recognize the user's instructions. It will be appreciated that upon first identifying a user's instruction, the audio device may be controlled to switch from a sleep state or standby state to an awake state, such as when a user-triggered "Small G! Small G! When the command is sent, the command is awakened; when the user's instruction, such as "play music", is recognized again, the corresponding operation is directly performed according to the user's instruction.
Specifically, when performing the voice recognition processing on the target signal, it can be determined whether a preset wake-up command, such as "small G |", exists in the target signal! Small G! If yes, controlling the audio equipment to be in a wake-up state. At this time, if the microphone is a microphone array, before the audio device is in an awake state, one or a predetermined number of microphones in the microphone array may be designated to be in an operating state, and other microphones may be in a sleep state or a standby state; and when the audio equipment is controlled to be in the awakening state, the microphones in the microphone array which are in the non-working state are controlled to be switched to the working state, namely all the microphones in the microphone array are in the working state. Therefore, the voice recognition computation amount and the power consumption of the audio equipment before being in the awakening state can be reduced, and the instruction of the user can be recognized more accurately after the audio equipment is awakened.
The present invention also provides an audio device comprising a processor and an echo cancellation program of the audio device stored in the processor and operable on the processor, wherein the echo cancellation program of the audio device, when executed by the processor, implements the steps of the echo cancellation method of the audio device as described above.
The present invention also provides a computer-readable storage medium, which is characterized in that the computer-readable storage medium stores thereon an echo cancellation program of an audio device, and the echo cancellation program of the audio device is executed by a processor to implement the steps of the echo cancellation method of the audio device as described above.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or system. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or system that comprises the element.
The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.
Through the above description of the embodiments, those skilled in the art will clearly understand that the method of the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but in many cases, the former is a better implementation manner. Based on such understanding, the technical solutions of the present invention may be embodied in the form of a software product, which is stored in a storage medium (e.g., ROM/RAM, magnetic disk, optical disk) as described above and includes several instructions for enabling a terminal device (e.g., a mobile phone, a computer, a server, a controlled terminal, or a network device) to execute the method according to the embodiments of the present invention.
Claims (9)
1. A method of echo cancellation in an audio device, the method comprising:
acquiring a sound signal received by a microphone of the audio equipment, wherein the sound signal at least comprises a signal emitted by a loudspeaker of the audio equipment;
performing frequency compensation processing on the sound signal;
carrying out echo cancellation on the sound signal subjected to the frequency compensation processing;
performing frequency compensation removal processing on the sound signal subjected to echo cancellation to obtain a target signal in the sound signal;
the microphone is a microphone array, and the step of performing frequency compensation processing on the sound signal comprises:
acquiring frequency responses from the loudspeaker to all microphones in the microphone array and preset frequency responses from the loudspeaker to a preset reference microphone;
calculating the difference between the preset frequency response and each frequency response;
and according to the difference, carrying out frequency compensation on the sound signals correspondingly received by the microphones.
2. The echo cancellation method for an audio device according to claim 1, wherein the step of performing frequency compensation removal processing on the sound signal after echo cancellation to obtain a target signal in the sound signal comprises:
taking the negative value of the difference value;
and according to the negative value of the difference, performing frequency compensation removal processing on the sound signal subjected to echo cancellation to obtain a target signal in the sound signal.
3. The method of echo cancellation in an audio device according to claim 1, wherein the step of echo canceling the sound signal after the frequency compensation processing further comprises:
carrying out equalization processing on the sound signal subjected to echo cancellation according to preset equalization parameters;
and performing frequency compensation removal processing on the sound signal subjected to the equalization processing to obtain a target signal in the sound signal.
4. The echo cancellation method for an audio device according to any one of claims 1 to 3, wherein the step of performing frequency-removal compensation processing on the sound signal after echo cancellation to obtain a target signal in the sound signal further comprises:
and carrying out array processing and/or voice recognition processing on the target signal.
5. The echo cancellation method of an audio device according to claim 1, wherein the echo cancellation method of the audio device further comprises:
when the target signal is subjected to voice recognition processing, judging whether a preset awakening instruction exists in the target signal;
and if so, controlling the audio equipment to be in a wake-up state.
6. The method of claim 5, wherein when the microphone is a microphone array, one or a predetermined number of microphones of the microphone array are in an active state before the audio device is in an awake state.
7. The method of claim 6, wherein the step of controlling the audio device to be in the awake state if the current state exists comprises:
and controlling the microphones in the non-working state in the microphone array to be switched to the working state.
8. An audio device, characterized in that the audio device comprises a processor and an echo cancellation program of the audio device stored in the processor and executable on the processor, wherein the echo cancellation program of the audio device when executed by the processor implements the steps of the echo cancellation method of the audio device as claimed in any one of the preceding claims 1 to 7.
9. A computer-readable storage medium, characterized in that the computer-readable storage medium has stored thereon an echo cancellation program of an audio device, the echo cancellation program of the audio device being executed by a processor to implement the steps of the echo cancellation method of an audio device according to any one of claims 1 to 7.
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| CN110234043B (en) * | 2019-05-31 | 2020-08-25 | 歌尔科技有限公司 | Sound signal processing method, device and equipment based on microphone array |
| CN110310654A (en) * | 2019-07-26 | 2019-10-08 | 歌尔科技有限公司 | Echo cancel method and device, electronic equipment, readable storage medium storing program for executing |
| CN114143640B (en) * | 2021-11-30 | 2023-07-21 | 歌尔科技有限公司 | Headset and far-field noise elimination method, device and system thereof |
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| CN107577449A (en) * | 2017-09-04 | 2018-01-12 | 百度在线网络技术（北京）有限公司 | Wake up pick-up method, device, equipment and the storage medium of voice |
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