Echo cancellation method and system based on all-phase multi-delay partitioning frequency domain

Abstract

The invention relates to an echo cancellation method and system based on an all-phase multi-delay partitioning frequency domain. The method comprises the following steps: receiving remote audio signals, performing sample processing to obtain continuous remote audio sampling signals, and separately storing the continuous remote audio sampling signals; receiving near-end audio signals, performing sample processing to obtain continuous near-end audio sampling signals, and separately storing the continuous near-end audio sampling signals; respectively integrating the remote audio sampling signals and the near-end audio sampling signals, and respectively performing all-phase processing to obtain remote signals and near-end signals; performing Fourier transform processing on the remote signals and the near-end signals, and performing adaptive echo cancellation processing on the remote signals and the near-end signals converted into the frequency domain by using a multi-delay partitioning frequency domain algorithm to obtain audio signals; and encoding the audio signals, and sending the audio signals to a remote receiving end. Therefore, the spectrum leakage problem resulting from that the multi-delay partitioning frequency domain algorithm needs to be converted from the time domain into the frequency domain is solved, the echo estimation is better, and a better echo cancellation effect is achieved.

Description

technical field [0001] The invention relates to the technical field of echo cancellation in voice communication, in particular to an echo cancellation method and system based on all-phase multi-delay block frequency domain. Background technique [0002] In voice communication scenarios, especially in conference systems, hands-free phones and other communication devices where the microphone and speaker are used together, the remote voice signal is played through the local speaker, and is received by the local microphone together with the voice of the local user. collected, and transmitted back to the far end, so that the far end user is disturbed by the echo. [0003] The adaptive echo cancellation method aims to accurately estimate the near-end echo signal through the far-end voice signal, so that the voice signal collected at the near-end microphone is transmitted to the far end before removing this part of the echo to achieve a better call Effect. [0004] People have be...

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Problems solved by technology

[0007] In order to solve the shortcomings and deficiencies of the above-mentioned prior art, the present invention provides an echo cancellation method and system based on all-phase multi-delay block frequency domain, which solves the problem that the multi-delay block frequency domain algorithm needs to be transformed from the time domain to the frequency domain. Spectrum leakage problem that exists in order to achieve better echo estimation, so as to better eliminate echo and achieve better echo cancellation effect

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