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
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[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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