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An audio coding selective cryptographic method

A technology of speech coding and encryption method, which is applied in the field of speech coding, can solve problems such as inconvenient business needs, and achieve the effects of reducing resource occupation, improving efficiency, and improving real-time performance

Inactive Publication Date: 2007-10-24
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the overall encryption of the voice data stream is inconvenient to meet the business needs of different levels

Method used

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  • An audio coding selective cryptographic method
  • An audio coding selective cryptographic method
  • An audio coding selective cryptographic method

Examples

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Embodiment Construction

[0065] In order to make the objectives, technical solutions, and advantages of the present invention clearer, a selective encryption method for speech coding of the present invention will be described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, but not to limit the present invention.

[0066] Generally, the evaluation criteria for voice encryption include objective and subjective evaluation. However, for low-rate narrow-band compressed speech signals, objective evaluation parameters such as signal-to-noise ratio, etc., cannot truly reflect its performance. Subjective evaluation is closer to the actual situation, so it usually pays more attention to subjective evaluation. The main criteria for subjective evaluation include the following:

[0067] 1. Speech intelligibility (semantics)

[0068] 2. Gender judgment of speech

[...

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Abstract

The invention discloses a sound code selective encrypt method, comprising A, first initialization, selecting encrypt safe level, finding the adjust parameters of chaotic encrypt method, B, finding the bit positions of encrypt bit serial number list and bit position list according to the frame speed and safe level, using chaotic encrypt method to encrypt, or even composed of step C that the decrypt user receives the encrypt data, to initialize and decrypt. The invention sets object data bit of sound code according to safe level, to improve real-time property, reduce system energy consumption and meet the demands of different levels.

Description

Technical field [0001] The invention relates to the technical field of speech coding. In particular, it relates to a selective encryption method for speech coding, and particularly relates to a selective encryption method for G.723.1 speech coding. Background technique [0002] With the rapid growth of the demand for communication services, in order to ensure the transmission of communication service data, people vigorously carry out research work on various data compression technologies. The compressed digital transmission of voice signals has been the direction that people have been working hard for for many years. [0003] The prior art generally uses low-rate speech coding technology for speech transmission. Low-rate speech coding is to reduce the coding rate while minimizing distortion, so as to reduce the bandwidth occupied during transmission. Compared with analog transmission, it can save bandwidth and facilitate integration with the Internet (Internet Protocol, IP). [0...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10L19/00H04L9/14G10L19/005
Inventor 黄本雄何娟杨军
Owner HUAZHONG UNIV OF SCI & TECH
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