Pulse or digital communications – Bandwidth reduction or expansion – Television or motion video signal
Reexamination Certificate
2005-11-01
2005-11-01
Lee, Richard (Department: 2613)
Pulse or digital communications
Bandwidth reduction or expansion
Television or motion video signal
Reexamination Certificate
active
06961377
ABSTRACT:
A transcoder system for compressed digital video bitstreams comprising three frame types: I-frames, P-frames and B-frames. The system includes a picture reader decoder to ascertain the type of each frame prior to transcoding. The system also includes a T2transcoder for processing I-frames and P-frames, possibly excepting the last P-frame of a group-of-frames (GOP), a T1transcoder for processing B-frames and (optionally) the last P-frame of a GOP and a picture decision block for separating all frames into I-frames and P-frames, possibly excepting the last P-frame of a GOP for processing by the T2transcoder and B-frames and (optionally) the last P-frame of a GOP for processing by said T1transcoder. Another component is a remerge block for recombining the output of all frames from said T1transcoder and the T2transcoder into a reconstituted output bitstream, such that most of the frames are processed by the much faster T1transcoder, thereby achieving substantial improvement in the transcoding throughput speed while retaining a low error rate.
REFERENCES:
patent: 6526099 (2003-02-01), Christopoulos et al.
patent: 6621866 (2003-09-01), Florencio et al.
patent: 2001/0047517 (2001-11-01), Christopoulos et al.
patent: 2002/0131496 (2002-09-01), Vasudevan et al.
patent: 2002/0136298 (2002-09-01), Anantharamu et al.
Lee Richard
Lnager Pat Atty Edward
Scopus Network Technologies Ltd.
Shibolth Yisraeli Roberts Zisman & Co.
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