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Speech LPC hiding and extraction algorithm based on filter similarity

A filter and similarity technology, applied in digital transmission systems, electrical components, transmission systems, etc., can solve the problems of small hidden capacity, poor resistance to channel interference and data operation, and it is difficult for algorithms to meet the hidden capacity requirements. The effect of ensuring continuity and reducing bit rate

Inactive Publication Date: 2009-11-11
吴志军 +1
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  • Abstract
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AI Technical Summary

Problems solved by technology

[0030] Insufficient LSB algorithm: extremely poor resistance to channel interference and data manipulation
[0085] The advantage of the transform domain algorithm is: it has strong robustness, and can obtain excellent hiding effect; but its disadvantage is: the hidden capacity is small, suitable for hiding a small amount of secret data
For information hiding systems that require a large hiding capacity, it is difficult for this type of algorithm to meet the required hiding capacity requirements

Method used

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  • Speech LPC hiding and extraction algorithm based on filter similarity
  • Speech LPC hiding and extraction algorithm based on filter similarity
  • Speech LPC hiding and extraction algorithm based on filter similarity

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Embodiment approach

[0119] The present invention is designed under the premise of satisfying above-mentioned 3 characteristics, and specific implementation is as follows:

[0120] 1. Filter Similarity

[0121] Filter similarity mainly utilizes a large amount of redundant information in the speech signal to determine the LPC parameters that can be used to hide secret speech information. For different speech coding schemes, different speech parameters can be extracted for embedding (hiding) secret speech information according to speech characteristics and actual requirements.

[0122] Among them, the main speech parameters for the waveform coding type include: speech sample point value, short-term speech energy and differential parameters, etc.; for the synthesis-analysis ABS coding type, the main speech parameters include: speech voicing parameters, speech energy parameters, Linear prediction parameters (or line spectrum frequency LSF), excitation parameters, pitch parameters and corresponding va...

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PUM

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Abstract

The invention uses a speech media as a carrier object for speech information hiding and extraction, utilizes the information secret characteristic of information hiding, combines the characteristic ofspeech coding, designs a secret speech information hiding and extraction algorithm, establishes a speech subthreshold channel and realizes a novel real-time speech secret communication mode. The inve ntion comprises the following contents: (1), providing a filter similarity concept and also providing a corresponding definition and a corresponding quantitative calculation method of a filter for determining a speech code LPC parameter used for hiding secret speech information; and (2), providing a speech LPC hiding and extraction algorithm based on filter similarity. After secret speech is embedded into carrier speech, the quality of the carrier speech is not reduced obviously, and the embedded secret speech information can not be detected. Under the condition that the communication rate is ensured, the algorithm can provide enough hiding capacity to ensure the continuity of communication speech and can greatly reduce the code rate.

Description

technical field [0001] The invention is a core algorithm used in a secret communication system for secret voice real-time communication. The invention can be loaded on the general voice signal processing module, and carry out real-time covert communication of secret voice through the public switched communication network (public switched telephone network PSTN, video conferencing network, VoIP network or mobile communication GSM and CDMA network). The invention belongs to the technical field of Information Hiding in the field of computer technology and network security. Background technique [0002] Since the first international conference on information hiding technology was held in 1996, the theory, method and application research of information hiding have been paid more and more attention. With the continuous development of information hiding technology, it has been adopted by many application fields as a new information security technology. Many academic institutions ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04K1/00H04L9/00
Inventor 吴志军杨伟
Owner 吴志军
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