Audio automatic gain control method and device

Abstract

The invention discloses an audio automatic gain control method and device. The method comprises the following steps: inputting audio signals to a programmable gain amplifier module and an ADC (Analogto Digital Conversion) module, then outputting audio signals to be processed to an error detection module, calculating the difference between the maximum of an amplitude absolute value of a current frame of audio data and a target amplitude peak, generating an error signal value err, processing the err in a loop back filter module to output an error signal value errout, processing the errout in again control module, comparing the absolute value of the errout and a preset error margin threshold errth to generate a gain control parameter, and feeding the gain control parameter back to a programmable gain amplifier, thus realizing automatic control on audio signal gain. The amplitude, which is too large or too small, of the input audio signals is adjusted to a standard range by automaticallycontrolling the gain thereof; and in face of large peak error, possible damped oscillation is eliminated by loop back filtration, so that the problem of fluctuation of audio signals is solved.

Description

technical field [0001] The invention relates to audio data processing technology, in particular to an audio automatic gain control method and device. Background technique [0002] The processing and playback of audio signals has been widely used in various scenarios. In the process of audio signal processing, due to different audio sources, different audio signal strengths are different, accompanied by noise. There are mainly two existing audio adjustment methods. One is that the user manually adjusts the input volume to change the final output volume, but this method is cumbersome to operate and the user experience is poor; the other is automatic audio gain. Adjustment method, but this method lacks loopback filter processing, and cannot ensure that the entire automatic gain control system can remain stable during the gain adjustment process. When a large peak error is encountered, damping oscillations may occur and the system fluctuates, thus The voice fluctuates. Conte...

AI Technical Summary

Problems solved by technology

In the process of audio signal processing, due to different audio sources, there are different audio signal strengths, accompanied by noise

There are mainly two existing audio adjustment methods. One is that the user manually adjusts the input volume to change the final output volume, but this method is cumbersome to operate and the user experience is poor; the other is automatic audio gain. Adjustment method, but this method lacks loopback filter processing, and cannot ensure that the entire automatic gain control system can remain stable during the gain adjustment process. When a large peak error is encountered, damping oscillations may occur and the system fluctuates, thus high and low voice

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