Information hiding method and extraction method for linear prediction voice coding

A technology of speech coding and information hiding, which is applied in the field of data communication and can solve the problems of low embedding efficiency

Active Publication Date: 2014-09-24
HENGFENG INFORMATION TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the defect of low embedding efficiency of the linear predictive coding method in the prior art, thereby providing an information hiding method with higher embedding efficiency and a corresponding extraction method

Method used

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  • Information hiding method and extraction method for linear prediction voice coding
  • Information hiding method and extraction method for linear prediction voice coding
  • Information hiding method and extraction method for linear prediction voice coding

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Embodiment Construction

[0067] The present invention will be further described now in conjunction with accompanying drawing.

[0068] Since the linear predictive speech coding in the prior art is performed in units of frames, and the coding includes the LPC process, the speech code stream can be regarded as a linear set of the LPC process. as attached figure 1 As shown, each LPC process includes several times of vector quantization (ie figure 1 VQ in VQ, Vector Quantization), using the QIM method can generate an embedding position in each vector quantization, so all embeddable positions in the speech code stream converge into an information hiding space. The points in the information hiding space establish a one-to-one mapping relationship with the hideable positions in the actual code stream through the QIM method. The information hiding space provides an ideal environment for information embedding. The information embedding is no longer constrained by the embedding carrier, and the mapping operat...

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Abstract

The invention relates to an information hiding method for linear prediction voice coding. The method includes the following steps: regarding all positions, at which embedment can be carried out through use of QIM, in a linear prediction voice bit stream as an information hiding space and representing the space with an array A; according to a needed security level, selecting an embedment rate; partitioning the array A so as to obtain a partitioning array; according to a p and the embedment rate, generating a Key and generating a to-be-embedded array B; partitioning the to-be-embedded array B so as to obtain minimum embedment units C; according to the Key, selecting an embedment mode in the minimum embedment units so as to obtain one or more to-be-embedded sequences, wherein each to-be-embedded sequence includes a plurality of embedment positions; and on the basis of the to-be-embedded sequences, realizing hiding of secret information through combination of matrix coding and a QIM (Quantization Index Modulation) method. The invention also provides an information extracting method corresponding to the information hiding method.

Description

technical field [0001] The invention relates to the field of data communication, in particular to an information hiding method of linear predictive speech coding. Background technique [0002] The continuous development of information technology has brought convenience to people's life, but it has also brought many problems such as information authentication, copyright protection, and secret communication. Information hiding technology can solve these problems well. It is a technology that embeds secret information into common carriers, and achieves the purpose of transmitting secret information by hiding the secret communication itself. [0003] With the continuous growth of network bandwidth and the integration of wired and wireless networks, instant voice communication software based on the Internet has been widely used. The communication voice traffic brought by these software has exceeded the fixed-line long-distance telephone traffic, and the network voice stream has...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10L19/018
Inventor 李松斌刘鹏戴琼兴邓浩江
Owner HENGFENG INFORMATION TECH CO LTD
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