Embedding supplemental data in an encoded signal, such as audio

Details Embedding supplemental data in an encoded signal, such as audio Embedding supplemental data in an encoded signal, such as audio

1998-01-26

2000-12-05

Wamsley, Patrick

Coded data generation or conversion

Analog to or from digital conversion

Differential encoder and/or decoder

380203, H03M 300, H04N 7167

Patent

active

061573302

ABSTRACT:
Method of embedding watermarks in a signal encoded by an encoder having a feedback loop, for example, a sigma-delta modulator (21,22,23). A digital watermark pattern (w) is embedded in the signal (z) by modifying selected samples (for example, replacing every 100th bit) of the encoded signal (y) by samples of the watermark pattern. The circuit (24) for modifying the samples is located inside the loop of the encoder. The effect of watermarking is thus compensated in subsequent encoding steps and the signal-to-noise ratio is only slightly affected.

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Bors et al, "Image Watermarking Using DCT Domain Constriants," Image Processing, 231-234, Sep. 1996.
Swanson et al, "Transparent Robust Image Watermarking," Image Processing, 211-214, Sep. 1996.
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Magrath et al, "Encoding Hidden Data Channels in Sigma Delta Bitstreams," IEEE, 1998.
F. Hartung and B. Giros: "Digital Watermarking of Raw and Compressed Video", SPIE vol. 2952, pp. 205-212.
I.J. Cox, J. Kilian, T. Leighton and T. Shamoon: "A Secure Imperceptible Yet Perceptually Salient, Spread Spectrum Watermark for Multimedia", A Conference Record of Southcon 96, Jun. 25-27, 1996, pp. 192-197.

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