Cryptography – Video cryptography – Video electric signal modification
Reexamination Certificate
2008-01-01
2008-01-01
Barron, Gilberto (Department: 2137)
Cryptography
Video cryptography
Video electric signal modification
Reexamination Certificate
active
10183798
ABSTRACT:
A receiver for receiving an MPEG encrypted transport stream and outputting audio and video signals comprising: a decryptor adapted to receive and decrypt the encrypted transport stream; a de-multiplexer adapted to convert the decrypted transport stream to audio and video elementary streams and to change the values in presentation time stamp and decoding time stamp fields of each packet of the audio and elementary streams to match the time of a receiver record clock; a storage sub-system adapted to store the audio and the video elementary streams and to change the values in the presentation time stamp and decoding time stamp fields of each header of the audio and video elementary streams to compensate for the amount of time the audio and video elementary streams are stored; and audio and video decoders to decode the audio and video elementary streams respectively.
REFERENCES:
patent: 6728271 (2004-04-01), Kawamura et al.
patent: 6850619 (2005-02-01), Hirai
patent: 6868096 (2005-03-01), Hayashi
patent: 6928165 (2005-08-01), Takai
A.S. Schaar et al, “Robust Method fro Recovering a Program Time Base in MPEG-2 Transport Streams and Achieving Audio/Video Synchronization”, filed Sep. 29, 2001, U.S. Appl. No. 09/967,877.
Mani Murali
Meenakshisundaram Ramanathan
van der Schaar Auke
Wester Rogatus Hubertus Hermanus
Abyaneh Ali S
Barron Gilberto
NXP B.V.
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