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Digital watermarking algorithm of audio signal tampering detection and recovery

A technology for tampering detection and speech signal, applied in speech analysis, instruments, etc., can solve the problem that the audio signal cannot be processed more accurately and efficiently, and the algorithm is rare in the audio field.

Active Publication Date: 2017-03-22
TIANJIN UNIV
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Watermarking technology has developed to a certain extent in the image field, but similar algorithms are rare in the audio field
Traditional watermark authentication technology focuses on detecting whether the signal has been damaged, testing the integrity of the signal, and cannot further process the audio signal accurately and efficiently and repair it

Method used

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  • Digital watermarking algorithm of audio signal tampering detection and recovery
  • Digital watermarking algorithm of audio signal tampering detection and recovery
  • Digital watermarking algorithm of audio signal tampering detection and recovery

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Embodiment Construction

[0108] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0109] Such as figure 1 As shown, the embedding process of the watermark information in the present invention includes the following steps.

[0110] In step 11, the original signal is divided into frames, and n adjacent sampling points of the signal are divided into one frame, and there is no overlap between frames.

[0111] In step 12, the frames are grouped, and each frame group contains m frames. Note that there are N sampling points in the original signal, and usually N is not an integer multiple of n×m. In this case, in order to simplify the subsequent processing, the original signal is zero-filled. After zero padding, there are n sampling points in each frame, n×m sampling points in each frame group, and there are N / (n×m) frame groups in total. While it is possible for a frame to consist of all zeros, there is no group of frames that is all zeros.

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Abstract

The present invention relates to a method of detecting and recovering the voice signal tampering by using the digital audio watermarks. The method takes the compression version of an original signal as a watermark signal, so that the watermark signal does not contain other redundant information and also does not need other information relevant with the original signal at recovery, and accordingly, the watermarks have a self-recovery performance. According to the redundancy of a digital watermark signal, the watermark information is embedded in the least significant bits (LSBs) of the signal. The watermark signal can accurately position and recovers a signal broken area, and can have a satisfying recovery effect while keeping a higher signal to noise ratio.

Description

technical field [0001] The patent of the present invention relates to the field of digital watermark technology, especially the application of fragile watermark technology to protect audio signals. Background technique [0002] The principle of digital watermarking technology is to use the redundancy of media signals such as images and sounds to embed relevant information in the original signal to protect the original information. According to the scope and meaning of use, this embedded information can be about the digital signal. The copyright information can also be a watermark with a relatively small code rate obtained by compressing the original signal. The embedded signal can be well hidden under the original signal and is not easy to be detected, and will not affect the original watermark. This technology can protect the copyright of digital signals to a certain extent, and can also use the characteristics of embedded watermarks to restore damaged information as much ...

Claims

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Application Information

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IPC IPC(8): G10L19/018G10L25/03G10L25/51
Inventor 路文焕魏建国李建方强侯庆志
Owner TIANJIN UNIV
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