Pulse or digital communications – Bandwidth reduction or expansion – Television or motion video signal
Patent
1997-08-18
1999-05-04
Bocure, Tesfaldet
Pulse or digital communications
Bandwidth reduction or expansion
Television or motion video signal
375245, 348398, 348405, 348406, H04B 122
Patent
active
059011785
ABSTRACT:
Auxiliary data is carried substantially imperceptibly with video transform data in combined transform samples according to a visibility threshold. The auxiliary data provides a capability for a copy protect scheme or verification of television viewing activity. The video transform samples are extracted from a compressed packetized data stream and normalized if required. The auxiliary data modulates data carrier sequences such as pseudo-noise (PN) spread spectrum signals in different spatial frequencies to provide auxiliary data subband samples, which are in turn combined with the video transform samples in one or more spatial frequencies to provide combined subband samples. The auxiliary data subband samples may be also spectrally shaped according to the video transform samples to improve concealment. The combined transform samples are then multiplexed into the packetized data stream. Full decompression of the video transform samples is not required. In a decoder, the combined transform samples are demodulated to recover the auxiliary data signal.
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Hinderling Jurg
Lee Chong U.
Moallemi Kamran
Bocure Tesfaldet
Hoppin Ralph F.
Lipsitz Barry R.
Solana Technology Development Corporation
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