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Bridge connection computing method of digital teleconference

A technology of teleconferencing and computing methods, which is applied in the direction of subscriber special services, etc., and can solve problems such as unstable voice gain, weak and fluctuating signal amplitude, and aggravated waveform distortion.

Inactive Publication Date: 2009-10-14
CHONGQING JINMEI COMM
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Problems solved by technology

[0002] The usual voice conferencing operation is realized by waveform superposition. In this method, when the number of participating channels is large, the waveform distortion is obviously intensified, and the voice quality even reaches the level of indistinguishability, and the superimposed signal amplitude presents a weak and fluctuating phenomenon. The voice gain is unstable, and the voice hearing effect is unnatural

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  • Bridge connection computing method of digital teleconference
  • Bridge connection computing method of digital teleconference
  • Bridge connection computing method of digital teleconference

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Embodiment Construction

[0046] Aiming at the deficiencies of the prior art in the background technology, the present invention proposes a bridge operation method for digital teleconferencing, see attached figure 1 , the flow process of the inventive method can be summarized as follows: the system is to the different network segment signals that receive: 1) carry out FIFO buffering, 2) decoding, 3) the VAD voice activity detection (being that Fig. VAD calculation in ), 4) sampling rate matching, 5) short-term amplitude calculation, 6) bridge operation, 7) sampling rate restoration, 8) funnel mixing operation, 9) the system sending end sends a uniform signal to each channel every 10ms , Continuous 10ms code flow; bridge operation cycle 10ms.

[0047] The basis for choosing 10ms for the bridge calculation period: in the characteristics of human speech (mainly composed of unvoiced and voiced sounds), unvoiced sounds are white noise-like signals, and voiced sounds are generated by the vibration of the voc...

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Abstract

The invention discloses a bridge connection computing method of a digital teleconference, which is characterized in that: a time delay vibrating processing mechanism is adopted for modifying a multi-sectional code stream; VAD voice activity detection which combines single frame detection with long time window detection and sample rate matching algorithm are used for reducing the invalid number of channels which enter bridge connection algorithm and reducing computing false rate; and short-term amplitude computing and funnel audio mixing computing are used for reducing operand. The invention has the benefit effects as follows: 1) the method adapts to large time delay vibrating under the condition of IPNET, can offer multi-sectional code stream modification, offer continuous and homogeneous voice code stream for terminals, and improve the audio quality of the decoded voice; 2) the adoption of the VAD voice activity detection and the sample rate matching algorithm can reduce the invalid number of channels which enter bridge connection algorithm and reduce computing false rate of the bridge connection; and 3) the adoption of short-term amplitude computing method and funnel mixing computing method can greatly reduce the operand, avoid bridge connection misjudgment caused by innovation shocks and improve the audio mixing quality of the bridge connection.

Description

technical field [0001] The invention relates to a digital telephone technology, in particular to a bridge operation method for a digital conference call. Background technique [0002] The usual voice conferencing operation is implemented by waveform superposition. In this method, when the number of participating channels is large, the waveform distortion is obviously intensified, and the voice quality even reaches the level of indistinguishability, and the superimposed signal amplitude presents a weak and fluctuating phenomenon. The voice gain is unstable, and the voice hearing effect is unnatural. Contents of the invention [0003] The present invention proposes a bridge operation method for digital teleconferencing, which adopts a time-delay jitter processing mechanism to shape multi-network segment streams; adopts VAD voice activation detection and sampling rate combined with single-frame detection and long-time window detection The matching algorithm reduces the numbe...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04M3/56
Inventor 黄河清高世幸廖红云
Owner CHONGQING JINMEI COMM
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