Didigal audio waterprint method based on low density parity check code

A low-density parity, digital audio technology, applied in the field of digital audio watermarking solutions, can solve the problems of narrow audio signal bandwidth, lack of total auditory transparency, etc., to achieve the effect of improving robustness, transparency and strong practicability

Inactive Publication Date: 2006-11-29
NANJING UNIV OF POSTS & TELECOMM
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AI Technical Summary

Problems solved by technology

Although for audio signals, several typical watermark embedding algorithms such as least significant bit method, spread spectrum coding method, phase coding method, echo concealment technology, etc. Due to the large dynamic range and the much narrower bandwidth of audio signals for watermark embedding than video or image signals, these methods do not always properly solve the auditory transparency problem
At the same time, in the face of powerful audio processing software and watermarking attack tools all over the Internet, these algorithms have varying degrees of defects in robustness. At present, there is no audio digital watermarking technology that can fully meet the security requirements.

Method used

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  • Didigal audio waterprint method based on low density parity check code
  • Didigal audio waterprint method based on low density parity check code
  • Didigal audio waterprint method based on low density parity check code

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Embodiment Construction

[0038] The embedded watermark uses the password "k" as a random seed to generate a spreading sequence b(k) with the same length as the watermark sequence. In order to ensure that the embedded watermark can resist the attacks of a series of signal processing methods such as noise and resampling in the transmission process, improve the error correction ability of the algorithm, and thus improve the robustness of the watermark, a parity check matrix with a column weight of 3 is first generated , the input sequence is encoded by low-density parity check (LDPC) to obtain a code sequence with codewords of 0 and 1. Since the amplitude of the embedded watermark in this scheme is proportional to the power, BPSK with an amplitude of 1 is performed on the encoded sequence (Binary digital phase shift keying) modulation to obtain the watermark sequence c (double sideband signal ±1) to be embedded. Then analyze the DC component and spectral power of each frame signal. Since the time-domain ...

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Abstract

A waterprint method of digital audio based on low density odd-even calibration code includes using password K as random seed of embedded waterprint and generating a spread-spectrum sequence b( k ) with equal length to waterprint sequence, generating an odd-even calibration matrix using 3 as column weight and obtaining new and protected waterprint code sequence with code digit of '' 0,1 '' after input sequence is passed through low density odd-even calibration code.

Description

technical field [0001] The invention relates to a digital audio watermark scheme for digital media copyright protection and authentication, and belongs to the technical fields of information hiding technology and voice signal processing. technical background [0002] As an important means of copyright protection, digital watermark technology has been widely researched and applied, but most of them are for video or image data. Although for audio signals, several typical watermark embedding algorithms such as least significant bit method, spread spectrum coding method, phase coding method, and echo concealment technology have been proposed, the human auditory system is sensitive to different frequency bands. Due to the large dynamic range and the much narrower bandwidth of audio signals than video or image signals, the above-mentioned methods cannot always properly solve the problem of auditory transparency. At the same time, in the face of the powerful audio processing softw...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10L19/00G10L19/14H03M13/11G11B20/00G06F21/00G06F21/16G10L19/018
Inventor 杨震周倩
Owner NANJING UNIV OF POSTS & TELECOMM
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