Broadband acoustics echo eliminating method

An acoustic echo cancellation and broadband technology, which is applied in two-way sound reinforcement telephone systems, speech analysis, instruments, etc., can solve the problem of large amount of calculation, and achieve the effect of reducing the amount of calculation and improving the efficiency of calculation.

Active Publication Date: 2008-07-23
ZTE CORP
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AI Technical Summary

Problems solved by technology

[0009] from figure 1 It can be seen from the figure that although the signal processing task is performed on the low sampling rate side,

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  • Broadband acoustics echo eliminating method
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  • Broadband acoustics echo eliminating method

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[0038] The basic idea of ​​the present invention is to use M subband uniform IDFT polyphase filter bank E i (z) Replace M subband analysis filter bank F i (z), it can be decimated before analysis and filtering; and adopt M subband uniform IDFT polyphase filter bank R i (z) Replace M subband synthesis filter bank G i (z), interpolation can be implemented after synthesis filtering; greatly reducing the amount of calculation and improving the efficiency of calculation.

[0039] The present invention will be described in detail below with reference to the drawings and embodiments.

[0040] figure 2 It is a schematic structural diagram of a broadband acoustic echo cancellation system using an M subband uniform IDFT polyphase filter bank according to the present invention.

[0041] Such as figure 2 As shown, the present invention uses M subband uniform IDFT polyphase filter bank E i (z) Replace M subband analysis filter bank F i (z); and use M subband uniform IDFT polyphase filter ba...

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Abstract

A wideband acoustic echo cancellation process comprise the following steps filtering an input shifting register which comprises far-end signals and the data in the input shifting register which comprises far-end signals, conducting the IDFT arithmetic to obtain far-end multi-sub-band data and near-end multi-sub-band data, conducting the adaptive filtering and the parameter updating for the far-end multi-sub-band data and the near-end multi-sub-band data to gain echo estimation difference, carrying out the IDFT arithmetic for the echo estimation difference of the multi-sub-band, conducting the synthetic filtering for the echo estimation difference of the multi-sub-band, adding the filtering output data which is gained through the filtering with the value in an output shifting register whose length is K, updating the output shifting register through using the value which is gained through the addition, outputting the front r points in the output shifting register, shifting forwards the positions of r points by the sequent K-r points, zeroizing the positions of r points, carrying out the shifting operations for the input shifting register, and repeating all the steps.

Description

technical field [0001] The invention relates to an audio processing method in a voice communication system, in particular to a broadband acoustic echo cancellation method in a voice communication system. Background technique [0002] Existing mobile phone or teleconferencing system is in the call process, and the voice signal that the other side of the call system transmits is called the far-end signal; The mixture of the sound generated behind the microphone) is called the near-end signal. The task of Acoustic Echo Cancellation (AEC, Acoustic Echo Cancellation) is to estimate the echo and remove it from the near-end signal, so as to obtain pure local voice. [0003] Most of the existing acoustic echo cancellation algorithms are only for narrowband (sampling rate 8K) speech codec algorithms, such as G.711. With the continuous improvement of users' requirements for sound quality, broadband (sampling rate 16K, 32K) audio codec algorithms, such as G.722 and G.722.1, have begu...

Claims

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Application Information

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IPC IPC(8): H04M9/08G10L21/02G10L21/0264
Inventor 舒畅黎家力
Owner ZTE CORP
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