echo canceller

Abstract

The invention relates to an echo cancellation device comprising a first processing unit, a second processing unit and a double-end speaker detection module, wherein the first processing unit is used for performing decorrelation processing on a multi-channel far-end sound signal, so as to output multiple channels of first signals; the second processing unit comprises an FIR (finite impulse response) filter module which comprises a plurality of filters for receiving the first signal as input respectively, and estimating echo signals corresponding to the first signals; the FIR filter module is used for filtering the echo signals out of local sound signals, so as to output second signals; and the double-end speaker detection module is used for judging whether a conversation device is in a conversation state or not and notifying the FIR filter module, so that the FIR filter module adjusts operation coefficients of filters according to the difference between each first signal and the local sound signal. The echo cancellation device can be used for realizing the echo cancellation for multiple channels of audio signals, and the convergence speed of the filter module is accelerated, so that a local sound field is accurately simulated, the effect of the echo cancellation is improved, and the running stability of the echo cancellation device is improved.

Description

technical field [0001] The present invention relates to voice communication technology, more specifically, to an echo canceling device. Background technique [0002] In the voice communication environment, especially in conference systems, hands-free phones and other communication devices where microphones and speakers coexist, the remote voice signal is played through the local speaker, and is collected by the local microphone together with the voice of the local user. , and is transmitted back to the far end, causing the far end user to be disturbed by the echo. The echo cancellation system generally approximates the actual sound field successively through filters, and then estimates the echo generated by the far-end sound signal at the local end, and then filters the estimated echo from the signal collected by the local microphone to achieve echo cancellation the goal of. [0003] In the prior art, the echo cancellation technology mostly implements a single-channel audi...

AI Technical Summary

Problems solved by technology

[0003] In the prior art, the echo cancellation technology mostly implements a single-channel audio signal, but there is no mature solution for the call between the local end and the remote end with multiple audio signals, and the multiple audio signals may come from the same The sound sources may have a strong correlation with each other, resulting in a significant decrease in the convergence speed of the filter, making it difficult to truly approach the actual sound field, and unable to achieve echo cancellation

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