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A Speech Out-of-Sync Detection Method Based on CVSD Coding Features

A detection method and coding feature technology, applied in the field of voice out-of-sync detection, to achieve the effects of flexible setting of the detection cycle, prevention of false out-of-sync, and simple design

Active Publication Date: 2021-02-12
NO 30 INST OF CHINA ELECTRONIC TECH GRP CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The method of the invention can effectively solve the problem of out-of-synchronization detection in narrowband voice communication, improve the bandwidth utilization rate of the channel, have strong anti-error capability, and can be widely used in confidential communication with higher requirements on call quality and security in the system

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  • A Speech Out-of-Sync Detection Method Based on CVSD Coding Features
  • A Speech Out-of-Sync Detection Method Based on CVSD Coding Features
  • A Speech Out-of-Sync Detection Method Based on CVSD Coding Features

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Embodiment Construction

[0020]1. The basic working principle of the invention

[0021]In nature, various normal sound signals (such as human voices, ringtones, music, background sounds, car whistle, etc.) are relatively smooth and gradual. After CVSD sampling, quantization, and encoding, they appear to be in the cycle The occurrence probability of "signature pattern" satisfies certain rules, and the energy distribution is relatively uniform; once the statistics of "signature pattern" in the occurrence period exceed the set threshold threshold and high energy distribution, it indicates that the voice signal in communication is irregular The jump indicates that a lot of noise appears in the voice communication, that is, the voice is out of step.

[0022]The present invention is based on the CVSD "characteristic code pattern" distribution law, and realizes the out-of-step detection function of the voice communication system through statistics and analysis of the characteristics of the voice data itself.

[0023]2. Typ...

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Abstract

The invention discloses a voice out-of-synchronization detection method based on CVSD encoding features, comprising the following steps: step 1, performing serial-to-parallel conversion processing on the serial code stream after CVSD encoding; step 2, performing serial-to-parallel conversion on the data processed Carry out statistics on characteristic patterns; step 3, make a speech out-of-sync judgment according to the comparison between the statistical results and the preset out-of-sync threshold. Compared with the prior art, the positive effect of the present invention is that the method of the present invention can be applied to many types of digital voice communication systems, and solves the technical problem of voice out-of-synchronization detection in the environment of limited channel resources and large transmission errors. The present invention does not need to insert a synchronization code group, does not occupy channel resources, and the detection period and threshold can be flexibly set, has a strong ability to resist channel error, and effectively prevents the phenomenon of "false out of sync". Both software and hardware can be realized.

Description

Technical field[0001]The invention relates to a voice out-of-synchronization detection method based on CVSD coding characteristics.Background technique[0002]At present, the common out-of-synchronization detection method in the communication process: the sending end inserts a synchronization code, and the receiving end compares bit by bit. This method requires the use of channel redundancy bandwidth (channel resources other than the transmission payload), and the transmitter periodically centralizes or decentralizes the insertion of synchronization codes. Its basic working principle is as followsfigure 1 Shown.[0003]A set of local synchronization code groups that are the same as the synchronization code inserted at the transmitter end is generated at the receiving end, and the local synchronization code group and the received signal sequence are compared and identified bit by bit in the identification circuit to perform out-of-synchronization detection.[0004]When the system is in a s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G10L19/005H04M3/22H03M3/02
CPCG10L19/005H03M3/024H04M3/2236
Inventor 廖蓉晖唐文许志强卿昱李鉴杨宏
Owner NO 30 INST OF CHINA ELECTRONIC TECH GRP CORP