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Method and its device for elliminating background noise in speech input

A background noise and voice input technology, applied in voice analysis, two-way sound reinforcement telephone system, instrument, etc., can solve the problems of high hardware cost, complex implementation, high power consumption, etc., and achieve the effect of good performance-cost ratio

Inactive Publication Date: 2006-08-23
VIMICRO CORP
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  • Abstract
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Problems solved by technology

But its disadvantages are complex implementation, high hardware cost (requires AD, DA and DSP), and high power consumption

Method used

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  • Method and its device for elliminating background noise in speech input
  • Method and its device for elliminating background noise in speech input
  • Method and its device for elliminating background noise in speech input

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Embodiment Construction

[0034] The purpose of the present invention is mainly to filter out the environmental noise when people do not speak, because the amplitude of the background noise is generally smaller than the amplitude of the speech signal, so it is considered that the signal with a small amplitude is the background noise, and the amplitude of the small amplitude signal is attenuated, thereby To achieve the purpose of eliminating noise.

[0035] This embodiment adopts digital technology and implements noise elimination by means of hardware. like image 3 As shown, the device of this embodiment includes an AD conversion module, an amplitude statistics module, a noise elimination module and a DA conversion module, wherein:

[0036] The AD conversion module is used to convert the input analog voice signal into a digital voice signal, and output them to the noise elimination module and the amplitude statistics module respectively.

[0037] The amplitude statistics module is used to calculate t...

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Abstract

This invention discloses a method and a device for eliminating background noises in eliminating phone input, in which, after receiving analog input phone signals, an A / D conversion module converts the signals into a digital phonetic signal sampling point sequence, an amplitude statistic module computes the energy value of each sampling point of the sampling block and calculates them to get a unified value, if said statistic value is lower than a designed noise threshold value, the noise eliminating module carries out noise attenuation to the sampling point sequence of the current block to be converted to analog phone signals and output by the A / D conversion module, otherwise, the noise eliminating module converts the original sampling point sequence to analog phone signals and output by the A / D conversion module.

Description

technical field [0001] The invention relates to a method and device for eliminating background noise in speech input. Background technique [0002] For the background noise problem in voice calls, there are currently two main solutions: using an analog filter to eliminate background noise and using a digital signal processor (DSP) to eliminate background noise, of which: [0003] Methods using analog filters, such as figure 1 As shown, analog filters mainly include high-pass and low-pass filters. The high-pass filter can filter out the low-frequency part of the noise that is not concerned about the voice call, such as the part below 200Hz. The low-pass filter can filter out the high-frequency part of the noise that is not concerned about the voice call, such as the part above 4kHz. [0004] The advantage of using the analog filter method is that it is simple to implement, low in hardware cost, and low in power consumption. But its obvious disadvantage is that the effect ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10L21/02H04M9/08
Inventor 杨作兴
Owner VIMICRO CORP
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