Robust detection for embedded signaling

Details Robust detection for embedded signaling Robust detection for embedded signaling

2005-01-04

2005-01-04

Tse, Young T. (Department: 2637)

Pulse or digital communications

Spread spectrum

Direct sequence

C375S140000, C375S147000

Reexamination Certificate

active

06839380

ABSTRACT:
This patent disclosure describes an effective synchronization technique for an embedded signaling system based on direct sequence spread spectrum technology. The technique provides an approach to robust detection of information codes embedded in an audio signal which is subject to undergoing such processes as re-recording of the material onto a different media, and conversions from digital to analog form and from analog to digital form. The technique is useful in preventing the embedded information from being corrupted or obscured by pirates via signal distortion operations including D/A and A/D conversions or by legitimate users in artistic processing of the material. The technique according to one embodiment of the present invention includes obtaining a timing error estimate in the process of synchronization by estimating the initial sampling rate/timing error by peak picking and by restoring the correct timing by sample interpolation after synchronization.

REFERENCES:
patent: 5493588 (1996-02-01), Lennen
patent: 5524127 (1996-06-01), Petranovich
patent: 6314129 (2001-11-01), Sunwoo et al.
patent: 6603803 (2003-08-01), Hatch

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