Device and method for echo elimination

Abstract

The invention discloses an echo canceling device, comprising: an adaptive filtering module, a main filtering module and a first control module. The present invention also discloses an echo cancellation method, which performs self-adaptive adjustment to the currently stored filter coefficient according to the previous echo source signal of the current segment, obtains the adjusted filter coefficient once, and then adjusts the filter coefficient once according to the echo source signal of the current segment The adjusted filter coefficients are subjected to a second adaptive adjustment, and if the adjustment results of the two times satisfy the preset conditions for updating the currently stored filter coefficients, the currently stored filter coefficients are updated with the once adjusted filter coefficients. The present invention ensures the reliability of the saved filter coefficients by further verifying the predetermined conditions for updating the filter coefficients, thereby ensuring the effect of echo cancellation. At the same time, the filter coefficients must meet the predetermined condition for a certain number of times before they can be further stored, which further ensures the accuracy of the stored filter coefficients and the reliability of echo cancellation.

Description

technical field [0001] The invention relates to the field of echo in a voice communication system, in particular to an echo canceling device and method. Background technique [0002] When making a call, especially a long-distance call, we can sometimes hear our own voice after a period of delay from the receiver, which is an echo. Echoes can be uncomfortable, and in severe cases, can even make calls impossible. [0003] Echo is divided into two types according to its generation mechanism: electrical echo and acoustic echo. like figure 1 shown, where R in Indicates the remote input signal, R out Indicates the far-end signal received by the near-end, S in Indicates the near-end input signal, S out Indicates the near-end signal received by the far-end. Taking the far end as an example, the mechanism of electrical echo is as follows: the far end voice signal R in When transmitting in the public switched telephone network (PSTN, Public Switched Telephone Network), it is n...

AI Technical Summary

Problems solved by technology

If the adjustment of the filter coefficients is not stopped in time when the filter coefficients are misadjusted, then the subsequent adjustment of the adaptive filter coefficients may always be in a chaotic state, so the effect of echo cancellation cannot be guaranteed

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