Realization method and realization system for automatic gain control

A technology of automatic gain control and implementation method, which is applied in the direction of gain control, amplification control, telephone communication, etc., can solve the problems of difficult wide application, clutter interference, high price, etc., and achieve improved versatility, low cost and reliable performance Effect

Inactive Publication Date: 2010-08-11
QINGDAO HISENSE MOBILE COMM TECH CO LTD
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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 ar

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  • Realization method and realization system for automatic gain control
  • Realization method and realization system for automatic gain control
  • Realization method and realization system for automatic gain control

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Embodiment Construction

[0026] The technical solution of the present invention will be further described in detail below in conjunction with the drawings and specific embodiments.

[0027] First, briefly explain the starting point of the technical solution of the present invention: with the emergence of MIDI music files, in order to solve the problem of large difference in volume output when playing MIDI files by different playback devices, the audio signal processing system in the prior art uses audio Dynamic range control module. The working principle of the audio dynamic range control module is similar to the process of automatic gain control, specifically: when the input signal amplitude of the module is less than the set threshold, the module outputs without attenuation; when the input signal amplitude When it is greater than the set threshold, the module attenuates the gain output. That is, when the input signal reaches 0dB (ie full amplitude), the signal will not be output at full amplitude. Wh...

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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, and in particular to the realization method and realization system of automatic gain control in the audio playback process. 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, high-volume mobile phones are quite popular among consumers. The external music of mobile phone mainly has two indicators of sound quality and volume, and an important indicator of sound quality is the low-frequency characteristics of the sound. Due to factors such as volume, the volume of speakers on mobile phones is generally relatively small. For small speakers, if the low frequency characteristics are better, their rated power is generally relatively small, that is, the volume will not be too large. If the power of the inp...

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Application Information

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IPC IPC(8): H03G3/20H04M1/725H04M1/72442
Inventor 王海盈赵玉峰魏于凡
Owner QINGDAO HISENSE MOBILE COMM TECH CO LTD
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