Digital transcoding system

Details Digital transcoding system Digital transcoding system

2011-05-03

2011-05-03

Philippe, Gims S (Department: 2482)

Pulse or digital communications

Bandwidth reduction or expansion

Television or motion video signal

C382S239000

Reexamination Certificate

active

07936816

ABSTRACT:
A digital transcoder system is presented for receiving data bit streams with a first bit rate (R1) and outputting a data bit stream with a second bit rate (R2) which differs from the first bit rate (R1), and in particular is reduced relative thereto. This transcoder system has a decoder device (10) on its input side and a coder device (20) on its output side, the latter consisting of a series circuit of a quantizer (21) for requantizing the data dequantized in the decoder device (10), with a requantization factor (Q2), also with a subsequent VLC coder (22) and an output buffer (23). Establishing the second bit rate (R2) requires that the requantization factor of the quantizer (21) be changed, with reference to macro-blocks, according to the specification of a certain calculational formula.

REFERENCES:
patent: 5537440 (1996-07-01), Eyuboglu et al.
patent: 5541852 (1996-07-01), Eyuboglu et al.
patent: 5570197 (1996-10-01), Boon
patent: 5657015 (1997-08-01), Nakajima et al.
patent: 5754235 (1998-05-01), Urano et al.
patent: 5870146 (1999-02-01), Zhu
patent: 5940130 (1999-08-01), Nilsson et al.
patent: 6208688 (2001-03-01), Seo et al.
patent: 6215425 (2001-04-01), Andrews et al.
patent: 6226328 (2001-05-01), Assuncao
patent: 6259741 (2001-07-01), Chen et al.
patent: 6278735 (2001-08-01), Mohsenian
patent: 6310915 (2001-10-01), Wells et al.
patent: 6441754 (2002-08-01), Wang et al.
patent: 6466623 (2002-10-01), Youn et al.
patent: 6847656 (2005-01-01), Wu et al.
patent: 7106799 (2006-09-01), Sostawa et al.
patent: 0 711 079 (1996-05-01), None
patent: 08251587 (1996-09-01), None
patent: 9625823 (1996-08-01), None
patent: WO 97/49206 (1997-12-01), None
patent: WO 97/49249 (1997-12-01), None
Björk et al., “Transcoder Architectures for Video Coding,”IEEE Transactions on Consumer Electronics, vol. 44, No. 1, Feb. 1998, pp. 88-98.
Nakajima et al., “Rate Conversion of MPEG Coded Video by Re-Quantization Process,”Proceedings of International Conference on Image Processing, Oct. 23-26, 1995, vol. 3, pp. 408-411.
Sun et al., “Architectures for MPEG Compressed Bitstream Scaling,”IEEE Transactions on Circuits and Systems for Video Technology, vol. 6, No. 2, Apr. 1996, pp. 191-199.
“Practical Considerations in Implementing Variable Rate Coders,”The Bell System Technical Journal, Mar. 1979, pp. 584-587 and 598-599.
Abstract of: Seo et al., “Efficient Rate Control Algorithm for Fast Transcoding,” Proceedings of the SPIE—The International Society for Optical Engineering, vol. 3528, 1999, pp. 249-260.
Keesman et al. “Transcoding of MPEG bitstreams”, Signal Processing: Image Communication, Elsevier Science Publishers, Amsterdam, NL, vol. 8, pp. 481-500 (1996).
Wilkinson, J. “Understanding MPEG Concatenation and Transcoding”, ABU Technical Review, Asian Broadcasting Union, Kuala Lumpur, MW, No. 177, Jul.-Aug. 1998, pp. 3-9.
Japanese Office Action.

Affiliated with

Also associated with

Rating

Digital transcoding system does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Digital transcoding system, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Digital transcoding system will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2680313