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Input gain control method for analog audio

An analog audio and gain control technology, applied in gain control, analog signal digital control, amplification control, etc., can solve problems such as divergence and filter misalignment, avoid nonlinear changes, improve stability, and enhance user experience. Effect

Active Publication Date: 2018-12-11
SICHUAN CHANGHONG ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide an analog audio input gain control method to solve the filter misalignment and divergence problems caused by the frequent nonlinear changes of the analog audio signal

Method used

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  • Input gain control method for analog audio
  • Input gain control method for analog audio

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Experimental program
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Effect test

Embodiment

[0017] The system setting environment of embodiment is as follows:

[0018] OS: Android 5.1

[0019] Microphone model: GEG06022WFJ25A

[0020] Speaker model: YX30030-A1-12W-6Ω

[0021] Analog-to-digital conversion chip: AC108

[0022] Play the song: "Bubble"

[0023] Calculation of gain tables.

[0024] 1. The volume range of the system is 0~100, divide it into 10 parts on average, and get 0~10, 11~20, 21~30, 31~40, 41~50, 51~60, 61~70, 71~80, 81-90, 91-100, a total of 10 levels.

[0025] 2. Set the system volume to 10, play songs in a loop, adjust the gain value of the analog-to-digital conversion unit of the analog microphone audio input part and the analog echo audio input part, so that the amplitude of the digital microphone audio signal and the digital echo audio signal is large enough and not Distortion, then write this set of gain values ​​to the gain table.

[0026] 3. Set the system volume to 20, play songs in a loop, adjust the gain value of the analog-to-digi...

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Abstract

The invention relates to the audio processing field and discloses an input gain control method of an analog audio frequency, which solves the problems of filter misalignment and divergence caused by frequent nonlinear changes of an analog audio signal. Before the system of the invention starts to work, the volume interval of the system is divided into a plurality of grades, the maximum volume value of each grade is taken for the gain test of the actual environment, the gain value of each grade is obtained, and the gain value of each grade is written into the gain table. After the system startsto work, the system volume change of the analog audio is monitored. When the system volume changes, the system volume is obtained through the function interface, and the level of the system volume isdetermined. Then, the gain table is queried, the gain value corresponding to the level is obtained, and the gain value is applied to the gain control unit. The present invention is applicable to programmable gain amplifiers.

Description

technical field [0001] The invention relates to the field of audio processing, in particular to an input gain control method of analog audio. Background technique [0002] Programmable Gain Amplifier (PGA) is the analog-end gain module of the analog-to-digital converter in the analog microphone audio input system. The existing technical solutions aim at the strategy of adjusting the analog-end gain, mostly based on the amplitude of the digital signal after the analog-to-digital conversion The size dynamically adjusts the analog side gain. The dynamic adjustment of the gain will lead to nonlinear changes of the input audio signal. For some signal processing algorithms that are sensitive to signal changes, especially the echo cancellation algorithm, the nonlinear change of the input audio signal will lead to the misalignment and divergence of the filter. In turn, the status of the processed audio signal is abnormal. Contents of the invention [0003] The technical problem ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03G3/00
CPCH03G3/001
Inventor 李超凡蒲东
Owner SICHUAN CHANGHONG ELECTRIC CO LTD