The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 04, 1999
Filed:
Aug. 18, 1997
Chong U Lee, San Diego, CA (US);
Kamran Moallemi, Del Mar, CA (US);
Jurg Hinderling, San Diego, CA (US);
Solana Technology Development Corporation, San Diego, CA (US);
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.