Echo elimination method

Abstract

The invention discloses an echo elimination method. An existing method only adopts an acoustic echo canceller, the echo cannot be completely eliminated, and the output of the acoustic echo canceller has an echo residue. According to the method, a low-pass filter, a loudspeaker, an acoustic echo canceller, a microphone and a high-pass filter, an energy extraction module, an energy comparison module, a comfort noise generation module and a near-end voice signal generation module are adopted. Firstly, the voice needing to be played is filtered, and the filtered voice is used as a reference tone;the reference tone is played; double-talk judgment is carried out on the high-frequency energy of the microphone; and according to the double-talk state, different processing is carried out on the residual signals. According to the method, low-echo and relatively high-keeping near-talk voice quality is achieved at the same time. According to the method, the implementation scheme is simple, the calculation amount is low, low echo residue can be realized in low-calculation-force embedded equipment, and relatively high near-talk voice quality can be kept.

Description

technical field [0001] The invention belongs to the technical field of sound data processing, and relates to an echo cancellation method in the echo cancellation process. Background technique [0002] Echo is the sound signal played by the speaker reflected by the environment and collected by the microphone. The echo is mixed with the sound of the current speaker and transmitted to the far end, affecting the reception quality of the far end. The traditional echo cancellation technology simply eliminates the echo through the acoustic echo canceller (such as figure 1 ). When the far-end speaker speaks, his voice signal (far-end voice ref) is transmitted to the near-end device through the telephone system or network system as a reference tone, and the reference tone is sent to the speaker a and the acoustic echo canceller c of the near-end device middle. The voice of the near-end speaker is picked up by the near-end microphone b together with the sound played by the speaker...

AI Technical Summary

Problems solved by technology

However, since the frequency spectrum of the far-end voice overlaps with the spectrum bandwidth of the near-end human voice, and the shape of the spectrum is similar, it is difficult to detect the near-end human speech, and the accuracy rate is not high, resulting in damage to the near-end voice and affecting people

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