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Input Gain Control Method for Analog Audio

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

Active Publication Date: 2021-05-25
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

Examples

Experimental program
Comparison scheme
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 field of audio processing, and discloses an analog audio input gain control method, which solves the problems of filter offset and divergence caused by frequent nonlinear changes of analog audio signals. Before the system of the present invention starts to work, the volume interval of the system is divided into multiple levels, the maximum volume value of each level is taken to carry out the gain test of the actual environment, the gain value of each level is obtained, and the gain value of each level is written into Gain table: After the system starts to work, monitor the system volume change of the analog audio. When the system volume changes, obtain the system volume through the function interface, and determine the level of the system volume, and then query the gain table to obtain the gain value corresponding to the level. , and then apply the gain value to the gain control unit. The present invention is suitable for 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 Patents(China)
IPC IPC(8): H03G3/00
CPCH03G3/001
Inventor 李超凡蒲东
Owner SICHUAN CHANGHONG ELECTRIC CO LTD