Bridge Operation Method for Digital Telephone Conference

A technology of teleconference and calculation method, which is applied in the direction of subscriber special service, etc., and can solve the problems of weak and fluctuating signal amplitude, unstable voice gain, difficult to distinguish voice quality, etc.

Inactive Publication Date: 2012-02-22
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 Operation Method for Digital Telephone Conference
  • Bridge Operation Method for Digital Telephone Conference
  • Bridge Operation Method for Digital Telephone Conference

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Embodiment Construction

[0045] 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.

[0046] 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 operation method for a digital telephone conference, which is characterized in that: a time delay and jitter processing mechanism is used to shape the code flow of multiple network segments; a VAD voice activation detection and a combination of single frame detection and long time window detection are adopted The sampling rate matching algorithm reduces the number of invalid channels entering the bridge operation and reduces the misjudgment rate of the operation; the short-term amplitude operation and funnel mixing operation are used to reduce the amount of calculation. The beneficial technical effects of the present invention are: 1) adapting to the large time delay jitter in the packet network environment, and providing code stream shaping of multiple network segments, providing continuous and uniform voice code streams for terminals, and improving the audio quality after decoding. 2) The VAD voice activation detection and sampling rate matching algorithm is adopted to reduce the number of invalid channels entering the bridge operation and reduce the misjudgment rate of the bridge operation. 3) The short-term amplitude calculation and funnel mixing method are adopted to greatly reduce the amount of calculation, avoid bridge misjudgment caused by impact interference, and improve the quality of bridge mixing.

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 Patents(China)
IPC IPC(8): H04M3/56
Inventor 黄河清高世幸廖红云
Owner CHONGQING JINMEI COMM
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