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Gain control method and device

A gain control and gain control circuit technology, applied in the direction of gain control, amplification control, electrical components, etc., can solve the problems of affecting the music playback effect, poor music file playback quality, affecting the user experience, etc., to improve the music playback effect. , the effect of eliminating noise

Active Publication Date: 2015-07-08
SHANGHAI AWINIC TECH CO LTD
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

However, the AGC control circuit in the audio power amplifier changes the gain at the peak of the output amplitude and introduces certain noises, which affects the music playback effect and produces certain noises. Therefore, there is a problem of poor playback quality of music files, which seriously affects user experience

Method used

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  • Gain control method and device

Examples

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Embodiment Construction

[0050] When playing music, you will find that the average volume of different music files is very different. There are two reasons. One is that the peak amplitude is different, and the other is that the peak factor is different.

[0051] figure 1 with figure 2 Schematic showing the average volume of the same piece of music at different peak amplitudes. in, figure 1 The peak amplitude of the music file in is 0dB, figure 2 The peak amplitude of music file playback in China is -12dB.

[0052] image 3 with Figure 4 Schematic diagram showing the volume of a music file with different crest factors. in image 3 The peak factor of the music file in the medium is 9dB, Figure 4 The music file in the medium has a peak factor of 19dB.

[0053] In a specific implementation, the crest factor can be calculated using the following formula:

[0054] Crestfactor = 101 g ( P pe...

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Abstract

The invention relates to a gain control method and device. The method includes the steps of collecting an output signal of an amplifier; when it is determined that the output signal is at a zero crossing point or is located in an adjacent section of the zero crossing point, controlling an AGC control circuit to output a corresponding gain signal, and controlling gains of the amplifier through a gain control circuit. By means of the scheme, the music playing quality can be improved.

Description

technical field [0001] The present invention relates to the technical field of gain control, in particular to a gain control method and device. Background technique [0002] The audio power amplifier is to amplify the power of the audio signal to drive the speaker to achieve the purpose of sound amplification. [0003] In order to improve the effect of playing music and increase the loudness of playing music, most of the current audio power amplifiers have an automatic gain control (Automatic Gain Control, AGC) function. As the input signal increases, the output power increases accordingly. After the AGC detects that the output power exceeds the set startup threshold, it actively reduces the internal gain of the power amplifier to limit the output power below the set power threshold; When the input signal decreases and the output power drops to the set release threshold, the AGC actively restores the internal gain of the power amplifier to limit the output of the power ampl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03G3/20
Inventor 张振浩张海军杜黎明管少钧程涛
Owner SHANGHAI AWINIC TECH CO LTD
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