Gain control system and method

Abstract

The invention is applicable to the technical field of multimedia data processing, and provides a gain control system and method. The system comprises a microphone, an analog gain control unit, an analog-digital converter and a digital gain control unit, wherein the microphone is used for converting sound signals into analog voice signals; the analog gain control unit is connected with the microphone and is used for carrying out coarse tuning on the analog voice signals output by the microphone so as to perform first-stage gain control; the analog-digital converter is connected with the analog gain control unit and is used for converting analog voice signals output by the analog gain control unit into digital voice signals; and the digital gain control unit is connected with the analog-digital converter and the analog gain control unit and is used for carrying out energy measurement on the digital voice signals output by the analog-digital converter, thus dynamically adjusting digital gain factors according to energy measurement results and carry out second-stage gain control on the digital voice signals according to adjusted gain factors. According to the embodiment of the invention, automatic voice-recording gain control is realized through the combination of digital gain control and analog gain control, the voice recording cost is reduced and the voice recording quality is improved.

Description

technical field [0001] The invention belongs to the technical field of multimedia data processing, and in particular relates to a gain control system and method. Background technique [0002] Recording is a basic function of many consumer electronic devices at present, such as landline telephones, mobile phones, various learning machines, mp3 players, etc., and there are even special recording devices-recording pens. When recording, the speaker is sometimes close to the microphone, sometimes far away, or sometimes speaks loudly or very loudly, and sometimes the voice is too low, which may cause the recorded sound quality to be poor, erratic, incoherent, or even broken. At this time, a technology called automatic gain control for recording is needed to improve this situation. If the energy of the sound source is too small during recording, it will be properly amplified; if the energy of the sound source is too strong, it will be appropriately weakened. ;Ultimately control th...

AI Technical Summary

Problems solved by technology

[0007] The purpose of the embodiments of the present invention is to provide a gain control system, aiming to solve the defects of the gain control method provided by the prior art, such as the problem of poor recording effect due to high hardware requirements or control processing methods, etc.

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