Method and apparatus for quantized exponential modulation for watermarking an input signal

A technology for inputting signals and outputting signals, which is applied in voice analysis, instruments, etc., and can solve problems such as audio quality degradation
CN103650039BActive Publication Date: 2016-08-03THOMSON LICENSING SA
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Patents(China)
Current Assignee / Owner
THOMSON LICENSING SA
Publication Date
2016-08-03

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Abstract

It is possible to achieve very high data rates with quantization index modulation QIM, and the capacity of watermark transmission is largely independent of the characteristics of the original audio signal, but the audio quality degrades at each watermark embedding and removal step. To avoid degrading the audio quality, the audio signal watermarking of the present invention uses a specific quantizer curve in the time domain, especially in the frequency domain, to embed the watermark message into the audio signal, making the process almost completely reversible. Furthermore, it has embedded power constraints in order to guarantee that the modification to the signal caused by watermark embedding is inaudible.
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Description

technical field

[0001] The invention relates to a method and apparatus for quantized exponential modulation for watermarking an input signal, wherein the input signal is quantized using different quantizer curves. Background technique

[0002] In known digital audio signal watermarking, the audio quality degrades at each watermark embedding and removal step.

[0003] One of the main methods of watermarking multimedia content is called quantization index modulation (QIM), see e.g. IEEE Journal of Information Theory May 2001 Vol. 47(4) pp. 1423-1443 B. Chen, G.W. Wornell Quantization Index Modulation: A Class of Provably Good Methods for Digital Watermarking and Information Embedding, or Proceedings of the IEE Colloquium on Secure Images and Image Authentication, London, UK, April 10, 2000, pp. 1-6, A Blind Watermarking Scheme Based on Structured Codebooks by J.J. Eggers, J.K.Su, B. Girod.

[0004] Very high data rates can be achieved with QIM, and the capacity of the waterma...

Claims

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