CN113689872A - Acoustic echo cancellation device - Google Patents
Acoustic echo cancellation device Download PDFInfo
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- CN113689872A CN113689872A CN202110934440.4A CN202110934440A CN113689872A CN 113689872 A CN113689872 A CN 113689872A CN 202110934440 A CN202110934440 A CN 202110934440A CN 113689872 A CN113689872 A CN 113689872A
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- 230000005236 sound signal Effects 0.000 claims abstract description 55
- 230000008030 elimination Effects 0.000 claims abstract description 23
- 238000003379 elimination reaction Methods 0.000 claims abstract description 23
- 238000006243 chemical reaction Methods 0.000 claims abstract description 9
- 230000003044 adaptive effect Effects 0.000 claims description 6
- 230000000694 effects Effects 0.000 abstract description 6
- 238000004891 communication Methods 0.000 description 14
- 238000002592 echocardiography Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
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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
- 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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- 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
- 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
- G10L2021/02082—Noise filtering the noise being echo, reverberation of the 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
- 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
- G10L21/0216—Noise filtering characterised by the method used for estimating noise
- G10L2021/02161—Number of inputs available containing the signal or the noise to be suppressed
- G10L2021/02166—Microphone arrays; Beamforming
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Abstract
The application discloses acoustic echo cancellation device includes: the device comprises a transceiving module, an acquisition module and an elimination module; the receiving and transmitting module is respectively connected with the acquisition module and the elimination module, and the acquisition module is connected with the elimination module; the receiving and transmitting module receives the far-end audio signal and transmits the far-end audio signal to the acquisition module; the acquisition module receives a far-end audio signal, acquires a near-end audio signal, performs digital-to-analog conversion on the far-end audio signal and the near-end audio signal into a far-end audio digital signal and a near-end audio digital signal, and sends the far-end audio digital signal and the near-end audio digital signal to the cancellation module, and the cancellation module performs echo cancellation according to the far-end audio digital signal and the near-end audio digital signal. Because the far-end audio digital signal and the near-end audio digital signal are acquired by the acquisition module, the far-end audio digital signal and the near-end audio digital signal are acquired by the same clock source, so that the far-end audio digital signal and the near-end audio digital signal are acquired by the same clock source, the far-end audio digital signal and the near-end audio digital signal meet the requirements of time alignment and time synchronization, and the echo cancellation effect of the cancellation module is better.
Description
Technical Field
The embodiment of the application relates to the field of communication, in particular to an acoustic echo cancellation device.
Background
With the increase of network speed and the popularization of large screens of computer conferences, products such as multi-person voice communication, audio conferences and the like become important tools for daily use. In a voice call system, acoustic echo is very easily generated in a duplex communication system in which a microphone and a loudspeaker interact and influence each other, so that an acoustic echo cancellation function provides important guarantee for high-quality call.
In the prior art, an acoustic echo cancellation method is to acquire a far-end audio analog signal between a power amplifier and a loudspeaker, and convert the far-end audio analog signal into a far-end audio digital signal through a digital-to-analog converter; then inputting the far-end audio digital signal into an echo cancellation module; meanwhile, a microphone array is used for collecting near-end audio analog signals, the near-end audio analog signals are connected to a processing chip of the microphone array, the processing chip internally completes multi-channel parallel digital-analog conversion, the near-end audio analog signals are converted into near-end audio digital signals, and then the near-end audio digital signals are input into an echo cancellation module; the echo cancellation module performs echo cancellation according to the far-end audio digital signal and the near-end audio digital signal by using an adaptive filter. The fact that the acquired far-end audio digital signal and the acquired near-end audio digital signal meet time alignment and time synchronization is an important factor influencing echo cancellation quality; however, in the prior art, the far-end audio digital signal is obtained through the digital-to-analog converter, and the near-end audio digital signal is obtained through the microphone processing chip by completing the multi-channel parallel digital-to-analog conversion internally, so that the far-end audio digital signal and the near-end audio digital signal are not the same clock source used for the digital-to-analog conversion, and the far-end audio digital signal and the near-end audio digital signal may have the situations of large time alignment deviation and large time synchronization deviation, thereby resulting in poor echo cancellation effect.
Disclosure of Invention
The embodiment of the application provides an acoustic echo cancellation device, and the far-end audio digital signal and the near-end audio digital signal are acquired through the acquisition module, so that the acquired far-end audio digital signal and the acquired near-end audio digital signal meet the requirements of time alignment and time synchronization, and the echo cancellation effect of the cancellation module is better.
The application provides an acoustic echo cancellation device, including:
the device comprises a transceiving module, an acquisition module and an elimination module; the transceiver module is respectively connected with the acquisition module and the elimination module, and the acquisition module is connected with the elimination module; the receiving and transmitting module receives a far-end audio signal and transmits the far-end audio signal to the acquisition module; the acquisition module receives the far-end audio signal, acquires the near-end audio signal and carries out digital-to-analog conversion on the far-end audio signal and the near-end audio signal into a far-end audio digital signal and a near-end audio digital signal, and sends the far-end audio digital signal and the near-end audio digital signal to the elimination module, and the elimination module carries out echo elimination according to the far-end audio digital signal and the near-end audio digital signal.
Optionally, the acoustic echo cancellation device further includes:
the power amplifier module is respectively connected with the transceiver module and the acquisition module and is used for amplifying the far-end audio signal received by the transceiver module.
Optionally, the acoustic echo cancellation device further includes:
the loudspeaker module is connected with the power amplifier module; the loudspeaker module is used for outputting audio signals.
Optionally, the collecting module includes:
a first microphone and a second microphone; the first microphone is used for collecting the far-end audio signal, and the second microphone is used for collecting the near-end audio signal.
Optionally, the eliminating module includes:
an adaptive filter for echo cancellation.
From the above techniques: the device comprises a transceiving module, an acquisition module and an elimination module; the transceiver module is respectively connected with the acquisition module and the elimination module, and the acquisition module is connected with the elimination module; the receiving and transmitting module receives a far-end audio signal and transmits the far-end audio signal to the acquisition module; the acquisition module receives the far-end audio signal, acquires the near-end audio signal and carries out digital-to-analog conversion on the far-end audio signal and the near-end audio signal into a far-end audio digital signal and a near-end audio digital signal, and sends the far-end audio digital signal and the near-end audio digital signal to the elimination module, and the elimination module carries out echo elimination according to the far-end audio digital signal and the near-end audio digital signal. Because the far-end audio digital signal and the near-end audio digital signal are acquired by the acquisition module, the far-end audio digital signal and the near-end audio digital signal are acquired by the same clock source, so that the far-end audio digital signal and the near-end audio digital signal are acquired by the same clock source, the far-end audio digital signal and the near-end audio digital signal meet the requirements of time alignment and time synchronization, and the echo cancellation effect of the cancellation module is better.
Drawings
Fig. 1 is a schematic structural diagram of an acoustic echo cancellation device according to the present application.
Detailed Description
The embodiment of the application provides an acoustic echo cancellation device, and the far-end audio digital signal and the near-end audio digital signal are acquired through the acquisition module, so that the acquired far-end audio digital signal and the acquired near-end audio digital signal meet the requirements of time alignment and time synchronization, and the echo cancellation effect of the cancellation module is better.
The embodiments of the present disclosure are described in detail below with reference to the accompanying drawings.
The embodiments of the present disclosure are described below with specific examples, and other advantages and effects of the present disclosure will be readily apparent to those skilled in the art from the disclosure in the specification. It is to be understood that the described embodiments are merely illustrative of some, and not restrictive, of the embodiments of the disclosure. The disclosure may be embodied or carried out in various other specific embodiments, and various modifications and changes may be made in the details within the description without departing from the spirit of the disclosure. It is to be noted that the features in the following embodiments and examples may be combined with each other without conflict. All other embodiments, which can be derived by a person skilled in the art from the embodiments disclosed herein without making any creative effort, shall fall within the protection scope of the present disclosure.
Example one
As shown in fig. 1, an acoustic echo cancellation device includes:
the system comprises a transceiver module 101, an acquisition module 102, a cancellation module 103, a power amplifier module 104 and a loudspeaker module 105; the transceiver module 101 is respectively connected with the acquisition module 102 and the elimination module 103, the acquisition module 102 is connected with the elimination module 103, the power amplifier module 104 is respectively connected with the transceiver module 101 and the acquisition module 102, and the speaker module 105 is connected with the power amplifier module 104; wherein the acquisition module 102 comprises: a first microphone 1021 and a second microphone 1022; the first microphone 1021 is used for collecting far-end audio signals, and the second microphone 1022 is used for collecting near-end audio signals; wherein the cancellation module 103 comprises: an adaptive filter 1031, the adaptive filter 1031 being used for echo cancellation.
The transceiver module 101 receives a far-end audio signal and sends the far-end audio signal to the acquisition module 102; the acquisition module 102 receives the far-end audio signal and sends the far-end audio signal to the power amplification module 104, and the speaker module 105 is used for outputting an audio signal; the acquisition module 102 is further configured to acquire a near-end audio signal, perform digital-to-analog conversion on the far-end audio signal and the near-end audio signal into a far-end audio digital signal and a near-end audio digital signal, send the far-end audio digital signal and the near-end audio digital signal to the cancellation module 103, and perform echo cancellation on the cancellation module 103 according to the far-end audio digital signal and the near-end audio digital signal.
In practical application, when a far-end speaker A and a near-end speaker B use communication equipment to communicate, the words of the far-end speaker A are collected by a microphone and transmitted to the communication equipment, the words reach the near-end communication equipment after wireless or wired transmission, and are played through a loudspeaker of the near-end B, the sounds are picked up by the microphone of the near-end B to the communication equipment to form acoustic echoes, the acoustic echoes are transmitted and returned to the communication equipment of the far-end A, and the acoustic echoes are played through the loudspeaker of the far-end A, so that the far-end speaker can hear the echoes. To solve the problem, the present invention proposes an acoustic echo cancellation device.
When the words of the far-end speaker a are collected by the far-end microphone and transmitted to the near-end communication device through the far-end communication device, the transceiver module 101 corresponding to the near-end communication device receives the far-end audio signal at this time, and sends the received far-end audio signal to the power amplifier module 104 and the first microphone 1021 in the collection module 102, and at this time, the first microphone 1021 and the power amplifier module 104 collect the far-end audio signal; when the power amplifier module 104 collects the far-end audio signal, the power amplifier module will amplify the far-end audio signal, and send the far-end audio signal to the speaker module 105, and at this time, the speaker module 105 outputs the far-end audio signal.
When the near-end speaker B speaks, the speech of the near-end speaker B is collected by the second microphone 1022 in the near-end collection module 102; after the far-end audio signal is captured by the first microphone 1021 and the near-end audio signal is captured by the second microphone 1022, the capturing module 102 captures the far-end audio signal and the near-end audio signal in time alignment and time synchronization. Then, the first microphone 1021 and the second microphone 1022 respectively perform digital-to-analog conversion on the far-end audio signal and the near-end audio signal into a far-end audio digital signal and a near-end audio digital signal by using a digital-to-analog converter inside the microphone array processing chip; the far-end audio digital signal and the near-end audio digital signal are input to the cancellation module 103, and the cancellation module 103 performs echo cancellation processing using the adaptive filter 1031 according to the far-end audio digital signal and the near-end audio digital signal to obtain audio information of a clearer near-end speaker. After the eliminating module 103 acquires the audio information of the clearer near-end speaker, the eliminating module 103 sends the audio information of the near-end speaker to the transceiver module 101, and the transceiver module 101 sends the audio information of the near-end speaker to the far-end communication device through the near-end communication device; so that the far-end communication device receives the clearer speech of the near-end speaker.
In this embodiment, the collecting module 102 is a microphone array, which is a plurality of wind combinations; the first microphone 1021 may be one microphone channel in the microphone array, may also be any two microphone channels in the microphone array, and may also be any number of microphone channels in the microphone array; the second microphone 1022 may exclude all the microphone channels of the first microphone 1021 in the microphone array, or may exclude any number of the microphone channels of the first microphone 1021 in the microphone array, which is not specifically limited herein.
In the present invention, unless otherwise expressly stated or limited, the first feature may be "on" the second feature in direct contact with the second feature, or the first and second features may be in indirect contact via an intermediate. "plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
The above description is for the purpose of illustrating embodiments of the invention and is not intended to limit the invention, and it will be apparent to those skilled in the art that any modification, equivalent replacement, or improvement made without departing from the spirit and principle of the invention shall fall within the protection scope of the invention.
Claims (5)
1. An acoustic echo cancellation device, comprising:
the device comprises a transceiving module, an acquisition module and an elimination module; the transceiver module is respectively connected with the acquisition module and the elimination module, and the acquisition module is connected with the elimination module; the receiving and transmitting module receives a far-end audio signal and transmits the far-end audio signal to the acquisition module; the acquisition module receives the far-end audio signal, acquires the near-end audio signal and carries out digital-to-analog conversion on the far-end audio signal and the near-end audio signal into a far-end audio digital signal and a near-end audio digital signal, and sends the far-end audio digital signal and the near-end audio digital signal to the elimination module, and the elimination module carries out echo elimination according to the far-end audio digital signal and the near-end audio digital signal.
2. The acoustic echo cancellation device of claim 1, wherein the acoustic echo cancellation device further comprises:
the power amplifier module is respectively connected with the transceiver module and the acquisition module and is used for amplifying the far-end audio signal received by the transceiver module.
3. The acoustic echo cancellation device of claim 2, wherein the acoustic echo cancellation device further comprises:
the loudspeaker module is connected with the power amplifier module; the loudspeaker module is used for outputting audio signals.
4. The acoustic echo cancellation device of any one of claims 1 to 3, wherein the acquisition module comprises:
a first microphone and a second microphone; the first microphone is used for collecting the far-end audio signal, and the second microphone is used for collecting the near-end audio signal.
5. The acoustic echo cancellation device of any one of claims 1 to 3, wherein the cancellation module comprises:
an adaptive filter for echo cancellation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110934440.4A CN113689872A (en) | 2021-08-16 | 2021-08-16 | Acoustic echo cancellation device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110934440.4A CN113689872A (en) | 2021-08-16 | 2021-08-16 | Acoustic echo cancellation device |
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| CN113689872A true CN113689872A (en) | 2021-11-23 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105657110A (en) * | 2016-02-26 | 2016-06-08 | 深圳Tcl数字技术有限公司 | Voice communication echo cancellation method and device |
| CN112292844A (en) * | 2019-05-22 | 2021-01-29 | 深圳市汇顶科技股份有限公司 | Double-end call detection method, double-end call detection device and echo cancellation system |
| CN213211700U (en) * | 2020-08-25 | 2021-05-14 | 北京百度网讯科技有限公司 | Echo cancellation device |
| CN213716506U (en) * | 2019-12-30 | 2021-07-16 | 深圳市潮流网络技术有限公司 | Echo cancellation device |
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2021
- 2021-08-16 CN CN202110934440.4A patent/CN113689872A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105657110A (en) * | 2016-02-26 | 2016-06-08 | 深圳Tcl数字技术有限公司 | Voice communication echo cancellation method and device |
| CN112292844A (en) * | 2019-05-22 | 2021-01-29 | 深圳市汇顶科技股份有限公司 | Double-end call detection method, double-end call detection device and echo cancellation system |
| CN213716506U (en) * | 2019-12-30 | 2021-07-16 | 深圳市潮流网络技术有限公司 | Echo cancellation device |
| CN213211700U (en) * | 2020-08-25 | 2021-05-14 | 北京百度网讯科技有限公司 | Echo cancellation device |
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