Automatic gain control method for audio signal and apparatus thereof

An automatic gain control, gain control technology, applied in gain control, amplification control, speech analysis, etc., can solve problems such as drop, signal-to-noise ratio change, harmonic distortion, etc.

Inactive Publication Date: 2008-01-23
VIMICRO CORP
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Problems solved by technology

[0005] But in this method, when peak clipping occurs, the sine wave of the clipped frequency becomes a square wave, and a series of harmonics based on the sine wave can be obtained by analyzing this square wave with a spectrum analyzer, which is so-called harmonic distortion
If the harmonic distortion exceeds a certain range, it will cause signal distortion and a decline in speech discrimination
Another problem that exists is the change of the signal-to-noise ratio
However, in this method, due to the high-gain characteristics of hearing aids, when the input signal is pure background noise, the background noise is often increased, which affects the sound quality.

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  • Automatic gain control method for audio signal and apparatus thereof
  • Automatic gain control method for audio signal and apparatus thereof
  • Automatic gain control method for audio signal and apparatus thereof

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Embodiment Construction

[0069] The basic idea of ​​the present invention is to detect whether the current frame input signal is a silent frame signal, and if it is a silent frame signal, directly output the current frame input signal; otherwise, perform amplifier gain processing on the current frame input signal and output it.

[0070] Among them, the process of performing amplifier gain processing and outputting the non-silent frame signal may be as follows: taking the current frame input signal as a unit of sampling point, performing amplifier gain processing and outputting the current sampling point using the current gain value, and obtaining the output of the sampling point Signal value, comparing the output signal value with a preset output signal threshold, if the output signal value is smaller than the threshold, increase the gain value, otherwise, decrease the gain value.

[0071] Or it can also be: take the input signal of the current frame as a unit, perform gain processing on the input sign...

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Abstract

The invention discloses an automatic gain control method for audio frequency, which presets the initial gain value. The method comprises: check whether the present frame input signal is mute frame signal; if it is a mute frame signal, directly output the present frame input signal; otherwise, process the present frame input signal in an amplification gain device and then output it. Besides, the invention also discloses an automatic gain control device for audio signal. The method and device disclosed in the invention, which do not amplify the background noise and do not produce signal distortion, are able to realize the automatic control of output power in hearing aid under the condition of ensuring the speech resolution ability.

Description

technical field [0001] The invention relates to the field of hearing aids, in particular to an automatic gain control method and device for audio signals. Background technique [0002] In the field of amplification and processing of audio signals, such as the field of hearing aids designed for deaf patients, the hearing loss of deaf patients is different than that of normal people, and the loss of different frequency bands is different. As shown in FIG. 1(a) and FIG. 1(b), FIG. 1(a) shows the hearing curve of a normal person, and FIG. 1(b) shows the hearing curve of a deaf patient. Among them, the hearing loss in the low-frequency part is small, and the hearing loss in the high-frequency part is large. Therefore, the hearing loss compensation of the hearing aid is to independently amplify the signals of each frequency band according to the hearing curve of the deaf patient, so as to amplify to the extent that the patient can perceive, thereby improving the patient's hearing...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10L21/02G10L11/02H03G3/20H04R25/00
Inventor 张晨冯宇红
Owner VIMICRO CORP
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