Voice telephone echo cancellation method, storage medium, electronic device and system

Abstract

The invention discloses a voice telephone echo cancellation method, storage medium, electronic equipment and system, and relates to the field of IP voice technology. The invention obtains the number of delayed frames preset by the user, and the position of the memory occupied by the audio frame in audio playback and audio recording Size; apply for the first space in the memory to store the playing audio data, and define the location for storing the playing audio data in the first space; when the audio playing thread needs to obtain the playing audio data, call the audio playing function to save the currently playing audio data Stored at the beginning of the position where the playback audio data is stored; when the audio recording thread generates audio collection data, call the audio recording function to obtain the playback audio data of the size of the memory occupied by an audio frame from the beginning position of the first space as an echo reference Data; call the echo cancellation function to cancel the echo. The invention can ensure the synchronous alignment of audio recording and playback, and effectively eliminate the echo recorded by the microphone.

Description

technical field [0001] The invention relates to the technical field of IP voice, in particular to a voice telephone echo cancellation method, a storage medium, electronic equipment and a system. Background technique [0002] In recent years, IP voice (Voice over IP) technology and its business have developed rapidly. Compared with traditional telephones, IP voice telephones are favored by the market for their high network bandwidth utilization, low call costs, and flexible provision of rich value-added functions. . However, voice over IP phones are also criticized for their poor voice quality and other weaknesses. Among them, the echo problem is particularly prominent, which seriously affects voice quality. Therefore, it is inevitable to add echo cancellation algorithms to voice over IP terminals. [0003] During an IP voice phone call, generally receiving the voice of the other party and transmitting it to the sound card for playback is carried out in one thread, while col...

AI Technical Summary

Problems solved by technology

However, voice-over-IP telephones are also criticized for their poor voice quality and other weaknesses. Among them, the echo problem is particularly prominent, which seriously affects the voice quality. Therefore, it is inevitable to add an echo cancellation algorithm to the voice-over-IP telephone terminal.

[0003] During an IP voice phone call, generally receiving the voice of the other party and transmitting it to the sound card for playback is carried out in one thread, while collecting the local voice and transmitting it to the other party is in another thread. When performing echo cancellation, the data in the playback thread needs to be used as a reference. However, there is a delay interval between the audio data recorded by the microphone and the audio data played by the speaker. It is very difficult to synchronize the data in the two threads. If it is not synchronized, the adaptive filter in the echo canceller will diverge, not only cannot eliminate the call echo, but also destroy the original collected sound, making it difficult to distinguish the sound transmitted to the sound card

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