Stealthy audio watermarking

Details Stealthy audio watermarking Stealthy audio watermarking

2006-03-28

2006-03-28

Revak, Christopher (Department: 2131)

Cryptography

Video cryptography

Video electric signal modification

C380S046000, C380S201000, C382S250000

Reexamination Certificate

active

07020285

ABSTRACT:
Described herein is technology for inserting and detecting watermarks in signals, such as a music clip. In one described implementation, a watermarking system employs chess spread-spectrum sequences (i.e., “chess watermarks”) to improve the balance of positive and negative chips in the watermarking sequences. In another described implementation, a watermarking system employs an energy-level trigger to determine whether to skip encoding of a portion of a watermark within a given time span of a clip. If a large discrepancy in energy levels exists over a given time frame, then the frame is not watermarked, to avoid audible time-dispersion of artifacts due to spectral modifications. In another described implementation, a watermarking system begins encoding of a watermark at a variable position after the beginning of a clip.

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