A method and device for automatic gain control of an audio signal

Abstract

The invention provides an audio signal automatic gain control method and device. The audio signal automatic gain control method comprises the steps of judging whether an input current-frame audio signal, which is subjected to echo cancellation, has echo residue or not; if the current-frame audio signal has echo residue, acquiring an echo residue factor according to echo residue data; acquiring an automatic gain value of the current-frame audio signal according to an automatic gain control strategy and the echo residue factor; and performing automatic gain processing on the current-frame audio signal according to the automatic gain value. The audio signal automatic gain control method can solve a problem that an audio effect is affected by echo residue which still exists after echo cancellation, the echo residue is further cancelled, and the audio quality is improved. In addition, the finally output sound amplitude is enabled to always kept in a constant range through automatic gain control for the audio signal.

Description

technical field [0001] The invention belongs to the technical field of computers, and in particular relates to an audio signal automatic gain control method and device. Background technique [0002] The distance between the sound source and the pickup determines the strength of the sound. When the sound source is closer to the pickup, the collected sound is stronger; when the sound source is farther away from the pickup, the collected sound is weaker. Due to unavoidable subjective factors in the live recording and broadcasting interactive system, the distance between the teacher and the microphone cannot be constant, resulting in the collected sound fluctuating, which seriously affects the listening effect of the receiver. The automatic gain control module (Automatic gain control) can realize the function of controlling the sound volume by changing the input and output compression ratio of the audio signal, so that the final output sound amplitude is always kept within a con...

AI Technical Summary

Problems solved by technology

However, due to the interactive function in the live recording and broadcasting interactive system, the microphone will inevitably collect the far-end sound (that is, the echo). After processing by the echo cancellation module, there will still be a certain degree of echo residue, so simply use the automatic gain control module. It will easily re-amplify the already weakened echo

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