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Method for eliminating noise of VOIP system bidirectional duplex hand-free voice

A two-way duplex, noise-cancelling technology, applied in the field of communications, can solve the problems of reduced call quality, sound attenuation, increased hardware costs, etc., to achieve the effect of dynamic real-time suppression of call noise and improved user experience

Inactive Publication Date: 2016-03-23
HANGZHOU LEHASI INTELLIGENT TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Dual MIC noise cancellation is to use the difference in signal strength on the two MICs to perform noise cancellation, but if the two MICs collect similar signal strengths, the normal call sound will be greatly attenuated, resulting in a decline in call quality, and the dual MIC cancellation Noise also increases hardware cost

Method used

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  • Method for eliminating noise of VOIP system bidirectional duplex hand-free voice
  • Method for eliminating noise of VOIP system bidirectional duplex hand-free voice
  • Method for eliminating noise of VOIP system bidirectional duplex hand-free voice

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Embodiment 1

[0023] A kind of method that noise elimination is carried out to VOIP system two-way duplex hands-free voice, comprises the following steps:

[0024] 1) Dynamically collect audio frame data from the microphone, add a window to the collected audio frame data, and judge whether the short-term energy and short-term zero-crossing rate reach the threshold, if not, modify it to soothing white noise, otherwise, proceed to the next step ;

[0025] 2) Convert the discrete time-domain digital signal into a frequency-domain digital signal through positive fast Fourier transformation, and calculate its low-frequency power and high-frequency power respectively. If the low-frequency power is not less than twice the high-frequency power, it is modified to soothing white noise. Otherwise, proceed to the next step;

[0026] 3) performing signal attenuation processing on speech frames with audio frequency less than 300Hz and greater than 2000Hz;

[0027] 4) The frequency domain digital signal...

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Abstract

The invention relates to the communication field and particularly relates to a method for eliminating noise of VOIP system bidirectional duplex hand-free voice. According to the method, through modes of dynamic sampling modeling, non speech frame peeling and linear noise voice frame attenuation, conversation noise is dynamically and timely inhibited, normal voice signals can not be attenuated through the method, hardware cost does not increase, and user experience is greatly improved.

Description

technical field [0001] The invention relates to the field of communication, in particular to a method for noise elimination of two-way duplex hands-free voice in a VOIP system. Background technique [0002] VOIP (Voice over Internet Protocol) is a new type of network technology that realizes telephone communication through the Internet or other IP networks. In recent years, with the increasing popularity of the Internet, IP telephony has also begun to be used in fixed-line communications. Its main features, such as low call cost, low construction cost, easy expansion, and increasingly excellent call quality, are currently regarded by international telecommunications companies as a A strong competitor in the traditional telecom business. [0003] The causes of noise in VOIP calls are complicated and come in various forms, which can be mainly divided into additive noise, acoustic echo and reverberation. Additive noise can generally be divided into three aspects, man-made noi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10L21/0208H04M7/00
CPCG10L21/0208H04M7/006
Inventor 解玉乐周毅
Owner HANGZHOU LEHASI INTELLIGENT TECH CO LTD
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