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SILK base voice range self-adaptive stenography method based on minimum distortion cost

A distortion cost, self-adaptive technology, applied in speech analysis, instruments, etc., can solve the problems of pitch period parameter calculation errors, difficulty in accurately predicting pitch delay values, etc., and achieve high concealment and security effects

Active Publication Date: 2019-08-02
WUHAN UNIV
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Problems solved by technology

[0009] Since the vibration of the vocal cords is quasi-periodic in the voiced sound frame, it is difficult to accurately predict the pitch delay value. In the encoding process, the calculation of the pitch period parameters inherently has errors

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  • SILK base voice range self-adaptive stenography method based on minimum distortion cost
  • SILK base voice range self-adaptive stenography method based on minimum distortion cost
  • SILK base voice range self-adaptive stenography method based on minimum distortion cost

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Embodiment Construction

[0022] In order to facilitate those of ordinary skill in the art to understand and implement the present invention, the present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the implementation examples described here are only used to illustrate and explain the present invention, and are not intended to limit this invention.

[0023] please see figure 2 , a kind of SILK basic sound domain adaptive steganography method based on minimum distortion cost provided by the present invention, comprises the following steps:

[0024] Step 1: Encode the original signal for the first time to obtain the offset vector v of each voiced frame, and search for all pitch candidates cl in the final stage for the pitch, and calculate the parameter encoding distortion C(cl,v) according to formula (3) ; and record the original pitch delay sequence Opt lag ;

[0025] The parameters of pitch period inc...

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Abstract

The invention discloses an SILK base voice range self-adaptive stenography method based on minimum distortion cost. The method is based on the characteristic of base sound period prediction inaccuracyin the SILK voice coding compression parameter; a base sound period parameter domain stenography algorithm is provided; on the basis of an STC self-adaptive stenography coding framework, the statistics safety and the auditory concealment are used as the target; a distortion function based on the base sound period coding parameter and statistics distribution characteristics is designed; the SILK base sound domain self-adaptive stenography algorithm based on the minimum distortion cost is realized. The method has the advantages that the stenography technology on the SILK voice coding carrier isrealized for the first time; good concealing performance and high safety are realized.

Description

technical field [0001] The invention belongs to the technical field of multimedia information content security, and relates to a SILK base tone adaptive steganography method, in particular to a SILK base tone adaptive steganography method based on minimum distortion cost. [0002] technical background [0003] In recent years, with the rapid development of mobile communication technology, the network bandwidth has been continuously improved, followed by the maturity of voice communication and audio conversation services. Voice communication on the Internet is becoming more and more common, and has gradually become an indispensable social means in daily life. During the compression and coding process of voice data, it is necessary to ensure the voice quality and also consider the compressed network bandwidth. Under such requirements, SILK compression coding is widely used. [0004] SILK compressed speech coding was developed by Skype and included in the IETF (The Internet Eng...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10L19/018
CPCG10L19/018
Inventor 任延珍杨瀚溢王丽娜
Owner WUHAN UNIV