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Voice secret communication system design method based on compressive sensing and information hiding

A compressed sensing and secure communication technology, applied in secure communication, voice analysis, electrical components, etc., can solve the problems of long delay and high computational complexity

Active Publication Date: 2013-10-30
NANJING UNIV OF POSTS & TELECOMM
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Problems solved by technology

This type of method can achieve a high compression rate, but the computational complexity is high and the delay is large

Method used

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  • Voice secret communication system design method based on compressive sensing and information hiding
  • Voice secret communication system design method based on compressive sensing and information hiding
  • Voice secret communication system design method based on compressive sensing and information hiding

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Embodiment Construction

[0044] The design of voice security communication system based on compressed sensing and information hiding includes two parts: embedded system design and extraction system design. The main implementation schemes of these two parts are given below.

[0045]A. Embedded system design (see figure 1 )

[0046] 1. Using the K singular value decomposition method to design the design of the compressed sensing overcomplete dictionary for speech signals

[0047] (1) Initialize the dictionary by cascading a double-redundant DCT matrix and a double-redundant DWT matrix, with a size of N×4N (4-fold redundancy), where N is the frame length of the speech signal. In this design, both the secret voice and the carrier voice are sampled at 8KHz, and the frame length N is 128.

[0048] (2) Dictionary training

[0049] Use a large amount of speech data of length N to train the dictionary. K-SVD is a K-means clustering process, which includes the following two parts: 1) Sparsely encode the tra...

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Abstract

The invention discloses a voice secret communication system design method based on compressive sensing and information hiding, comprising the following steps: embedding secret voice into carrier voice by an embedded system to obtain mixed voice; designing a compressive sensing overcomplete dictionary aiming at the voice signal; sampling the secret voice by a compressive sensing self-adaption observation matrix to obtain a observation vector for reducing dimensions; quantizing the observation vector by an LBG (Linde-Buzo-Gray algorithm) vector, taking the quantized observation vector to serve as secret information to embed into the carrier voice, and carrying out two-stage transform on the carrier voice to obtain mixed voice; extracting the secret voice from the mixed voice by an extraction system; carrying out discrete cosine transform on mixed voice, and improving wavelet transform two-stage transform to obtain a wavelet transform coefficient; obtaining a secret bit stream by a scalar Costa decoding algorithm; obtaining a reconstructing observation vector by an LBG vector quantization decoder; reconstructing the secret voice by a compressive sensing orthogonal matching pursuit algorithm; and improving the quality of the reconstructed secret voice with a wavelet denoising method.

Description

technical field [0001] The invention relates to the technical fields of signal sampling technology, information hiding technology and voice signal processing, in particular to a design method of a voice security communication system based on compressed sensing and information hiding. Background technique [0002] Speech is an important means for human beings to communicate information. With the development of social civilization, more and more attention has been paid to the security and privacy of voice communication. The traditional voice security communication mechanism protects the personal privacy of the communication user and the content of the call from being obtained by illegal eavesdroppers through encryption. However, with the rapid development of computer technology, more and more cryptographic algorithms can be cracked within a limited time. To make matters worse, the scrambled code stream produced by encryption clearly indicates the existence of secret informat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G10L19/00H04K1/00G10L19/018
Inventor 杨震叶蕾徐挺挺
Owner NANJING UNIV OF POSTS & TELECOMM
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