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

A compressed sensing and secure communication technology, which is applied in secure communication, speech analysis, electrical components, etc., and can solve problems such as high computational complexity and large delay.

Active Publication Date: 2011-04-27
NANJING UNIV OF POSTS & TELECOMM
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Problems solved by technology

This type of method can achieve a high compression rate, but

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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 speech 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. The K-singular value decomposition method is used to design the design of the compressed sensing overcomplete dictionary for speech signals

[0047] (1) Initialize the dictionary by concatenating a twice redundant DCT matrix and a twice redundant DWT matrix, the size is N×4N (4 times redundant), 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) Sparse coding of trai...

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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 speech signal processing technology, in particular to a design method of a speech security communication system based on compressed sensing and information hiding. Background technique [0002] Voice is an important means for humans to communicate information. With the development of social civilization, the security and privacy issues of voice communication have received more and more attention. 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 in a limited time. To make matters worse, the chaotic code stream produced by encryption clearly indicates the existence of secret info...

Claims

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Application Information

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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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