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Gain control method and device

A technology of gain control and circuit control, which is applied in the direction of gain control, amplification control, electrical components, etc., and can solve the problem that the playback effect of music files is unsatisfactory.

Active Publication Date: 2015-04-01
SHANGHAI AWINIC TECH CO LTD
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Problems solved by technology

[0004] A gain control method in the prior art can maintain the output signal at a set preset threshold when it is detected that the output signal of the amplifier is greater than a predetermined preset threshold, so as to reduce truncation distortion. The above gain control method Although the truncated distortion can be reduced to a certain extent, the playback effect of the music file after the above-mentioned gain control processing is still unsatisfactory

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Embodiment Construction

[0059] 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.

[0060] figure 1 and 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.

[0061] image 3 and Figure 4 A schematic diagram showing the volume of the same 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.

[0062] In a specific implementation, the crest factor can be calculated using the following formula:

[0063] Crestfactor = 10 lg ( P ...

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Abstract

The invention discloses a gain control method and device. The method includes the steps that an AGC control circuit controls an addition and subtraction counter to count according to corresponding sequential control starting time clock signals in accordance with detected output signals of an amplifier, so that corresponding gain signals are output; the gain of the amplifier is controlled through a gain control circuit according to the corresponding output gain signals. According to the scheme, the playing effect of music files is improved.

Description

technical field [0001] The invention relates to the technical field of vehicle control, in particular to a gain control method and device. Background technique [0002] The audio amplifier is to amplify the power of the audio itself to achieve the purpose of sound amplification. This type of loudspeaker mainly includes Class A circuits and Class D circuits, which are mostly used in outdoor broadcasting. [0003] In order to improve the effect of playing music and increase the loudness of playing music, most of the current audio amplifiers have an automatic gain control (Automatic Gain Control, AGC) function. As the input signal increases, the output signal increases accordingly. After the AGC detects that the output signal exceeds the set startup threshold, it actively reduces the gain inside the amplifier to limit the output signal below the set preset threshold; When the input signal decreases and the output signal drops to the set release threshold, the AGC actively rest...

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Application Information

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IPC IPC(8): H03G3/20
Inventor 张振浩姚炜孙洪军张忠
Owner SHANGHAI AWINIC TECH CO LTD