Gain control device of multimedia equipment

Abstract

The invention is applicable to the technical field of multimedia equipment, and provides a gain control device of multimedia equipment. A system comprises a microphone, an analogue gain controller, an analogue-to-digital converter and a digital gain control unit device, wherein the microphone is used for converting an acoustical signal into an analogue voice signal; the analogue gain controller is connected with the microphone and is used for executing coarse tuning operation on the analogue voice signal output by the microphone and carrying out first-stage gain control; the analogue-to-digital converter is connected with the analogue gain controller, and is used for converting the analogue voice signal output by the analogue gain controller into a digital voice signal; and the digital gain control unit device is connected with the analogue-to-digital converter and the analogue gain controller, and is used for carrying out energy detection on the digital voice signal output by the digital gain control unit device, and dynamically regulating a digital gain factor according to an energy detection result, and conducting second-stage gain control on the digital voice signal according to the regulated gain factor. The gain control device realizes the automatic recording gain control, lowers the recording cost, and improves the recording tone quality.

Description

[0001] technical field [0002] The invention belongs to the technical field of multimedia equipment, and in particular relates to a gain control device for multimedia equipment. Background technique [0003] 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. ;Ulti...

AI Technical Summary

Problems solved by technology

[0007] The object of the present invention is to provide a multimedia device gain control device, which aims to solve the defects of the gain control method provided by the prior art, such as the high cost due to high hardware requirements, etc. Problems with higher requirements for chip designer experience

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