Pulse or digital communications – Bandwidth reduction or expansion – Television or motion video signal
Reexamination Certificate
2006-01-31
2006-01-31
Le, Vu (Department: 2613)
Pulse or digital communications
Bandwidth reduction or expansion
Television or motion video signal
Reexamination Certificate
active
06993080
ABSTRACT:
A decoder2decodes a first compressed digital video bitstream whilst preserving the compression parameters thereof, the compression parameters including a first buffer occupancy value VBV—1representing the occupancy by the said first bitstream of a buffer of the decoder. A signal processor40processes the decompressed bitstream. An encoder6compresses the processed bitstream to produce a second compressed bitstream having a target bit rate, optionally with reuse of the said compression parameters of the first bitstream, the second bitstream having a second occupancy value VBV—2representing the occupancy of a downstream decoder buffer by the said second bitstream. The encoder controls (i) the target bit rate of the second bitstream and (ii) the recoding of the second bitstream to meet the said target bit rate, the target bit rate being varied in dependence on one or both of (a) VBV—2and (b) the difference between VBV—1and VBV—2, and the degree of reuse of the said preserved parameters being varied in dependence on one or both of (a) the degree to which VBV—2tends towards underflow and (b) the degree to which VBV—1differs from VBV—2tending towards underflow.In addition, stuffing bits are added to the bitstream if VBV—2is tending towards overflow of the downstream buffer and/or VBV—2differs from VBV—1tending towards overflow.
REFERENCES:
patent: 6529555 (2003-03-01), Saunders et al.
patent: 6611624 (2003-08-01), Zhang et al.
patent: 6643325 (2003-11-01), Webb et al.
patent: 6724436 (2004-04-01), Saunders et al.
patent: 6760377 (2004-07-01), Burns et al.
patent: 0 942 605 (1999-09-01), None
patent: 2 333 656 (1999-07-01), None
patent: 2 333 657 (1999-07-01), None
patent: WO 95 35628 (1995-12-01), None
Porter Robert Mark Stefan
Saunders Nicholas Ian
Frommer William S.
Frommer & Lawrence & Haug LLP
Le Vu
Presson Thomas F.
Senfi Behrooz
LandOfFree
Signal processing does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Signal processing, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Signal processing will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3536026