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Non-contact adaptive echo cancellation device and echo cancellation method

An echo cancellation, non-contact technology, used in interconnection devices, two-way sound reinforcement telephone systems, speech analysis, etc., can solve the problem that the nonlinear signal of the speaker cannot be effectively eliminated, so as to avoid adverse effects and improve echo suppression. quantity, and the effect of improving system performance

Active Publication Date: 2018-06-01
INST OF ACOUSTICS CHINESE ACAD OF SCI
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AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to solve the problem that the adaptive filter cannot effectively eliminate the nonlinear signal generated by the loudspeaker during the echo cancellation process, and the present invention provides a non-contact adaptive echo cancellation device

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  • Non-contact adaptive echo cancellation device and echo cancellation method
  • Non-contact adaptive echo cancellation device and echo cancellation method
  • Non-contact adaptive echo cancellation device and echo cancellation method

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Embodiment Construction

[0038] A non-contact adaptive echo cancellation device and echo cancellation method according to the present invention will be described in detail below with reference to the drawings and embodiments.

[0039] The traditional adaptive echo cancellation algorithm assumes that the far-end microphone signal r(n) is transformed into an analog electrical signal through D / A conversion to drive the near-end speaker to vibrate to form an acoustic signal, and the acoustic signal is picked up by the microphone and converted into an analog electrical signal. Finally, after A / D conversion, it is passed to the far-end speaker. At this time, the linear filter can be used to estimate the transfer function, thereby estimating the echo signal and suppressing the echo.

[0040] The adaptive echo cancellation algorithm uses the reference signal and the desired signal to adaptively adjust the estimated filter coefficients. When the algorithm converges, the estimated filter coefficients are equal t...

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Abstract

The invention provides a non-contact adaptive echo cancellation device and an echo cancellation method. The device comprises an adaptive identification filter (10) and a non-contact measurement device(7), wherein an output end of the non-contact measurement device (7) is connected with an input end of the adaptive identification filter (10), and the non-contact measurement device (7) emits laseror ultrasonic wave to a speaker diaphragm (6), and measures a reflected signal of the laser or the ultrasonic wave so as to acquire and use a signal reflecting vibration information of the speaker diaphragm as a reference signal of the adaptive identification filter (10). When the echo cancellation method is used to cancel echo based on the device, adverse effects of non-linear change of transmission from a speaker driving current signal to a sound signal on the adaptive identification filter can be prevented, and the convergence performance of the filter is improved; and the echo suppressionquantity in adaptive echo cancellation is increased, so that the system performance is improved.

Description

technical field [0001] The invention relates to the technical field of adaptive echo cancellation. In particular, it relates to a non-contact adaptive echo cancellation device and an echo cancellation method. Background technique [0002] In the process of audio and video instant communication, both communication parties are equipped with a microphone and a loudspeaker. The sound signal r(n) picked up by the far-end microphone is transmitted to the near-end through the line (such as telephone line, Internet), and then played by the near-end speaker. Echo signal, where the echo signal refers to the sound signal played by the near-end speaker and transmitted to the near-end microphone. The near-end microphone signal is similar to the far-end microphone signal. When the sound signal is transmitted to the far-end speaker, the far-end target can hear its own echo signal, thereby affecting the call quality of audio and video instant messaging. The performance of the audio and v...

Claims

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Application Information

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IPC IPC(8): H04M9/08G10L21/0208
CPCG10L21/0208H04M9/082
Inventor 彭任华郑成诗李晓东
Owner INST OF ACOUSTICS CHINESE ACAD OF SCI
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