Realization method and realization system for automatic gain control

Abstract

The invention discloses a realization method and a realization system for automatic gain control. The realization method comprises the following steps that the threshold value of an audio dynamic range control module are set; the audio dynamic range control module is used to receive and detect the amplitude of decoded audio signals and to compare the amplitude with the threshold value; if the amplitude is larger than the threshold value, the gain of the audio dynamic range control module is attenuated and corresponding audio signals are output according to the attenuated gain; and if the amplitude is not larger than the threshold value, corresponding audio signals are output by the audio dynamic range control module according to the normal gain. The invention has the advantages that the realization of the method for the automatic gain control is simple, the automatic gain control performance is reliable and the realization cost is low.

Description

technical field [0001] The present invention relates to the realization of automatic gain control, in particular, relates to the realization method and realization system of automatic gain control in the process of audio playing. Background technique [0002] With the continuous enrichment of mobile phone functions, especially the continuous expansion of multimedia functions, more and more consumers regard mobile phones as portable multimedia players. Therefore, mobile phones with high volume are quite popular among consumers. The external music of mobile phones mainly has two indicators: sound quality and volume, and an important indicator of sound quality is the low-frequency characteristics of the sound. Limited by factors such as volume, the volume of speakers on mobile phones is generally relatively small. For a speaker with a smaller volume, if the low-frequency characteristics are better, its rated power is generally relatively small, that is, its volume will not be ...

AI Technical Summary

Problems solved by technology

The solution of applying an audio power amplifier with automatic gain control function has the following disadvantages and shortcomings: First, components with automatic gain control function need to be purchased separately, but due to the relatively high price of such components, it is difficult to be widely used

Second, most of the audio power amplifiers with automatic gain control function on the market are Class D power amplifiers. Due to the high operating frequency of Class D power amplifiers, it is easy to generate various clutter interference, which affects the system work, especially the antenna performance of mobile phones.

Third, this type of audio power amplifier is only designed to drive speakers and cannot be used as an input signal for other devices, thus limiting the expansion of system performance

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