Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

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 scheme, can solve the problems of incomplete auditory transparency, narrow audio signal bandwidth, etc., achieve high practical value, improve robustness, improve robustness and transparency sexual effect

Inactive Publication Date: 2009-08-05
NANJING UNIV OF POSTS & TELECOMM
View PDF4 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • 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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0039] 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 ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): G10L19/00G10L19/14H03M13/11G11B20/00G06F21/00G06F21/16G10L19/018
Inventor 杨震周倩
Owner NANJING UNIV OF POSTS & TELECOMM
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com