Syntax independent variable length coder for digital video coder

Details Syntax independent variable length coder for digital video coder Syntax independent variable length coder for digital video coder

1995-02-02

1997-07-01

Young, Brian K.

Coded data generation or conversion

Digital code to digital code converters

To or from variable length codes

H03M 740

Patent

active

056443064

ABSTRACT:
The invention described herein is a syntax independent variable length coder and bitstream formatter for use in a digital video encoder. This bitstream coder uses a command buffer memory whose contents specify the syntax and content of the bitstream. Since this memory can be written by a programmable processor, the bitstream syntax is programmable. The bitstream coder supports to insert fixed length data bitsequences, variable length coded data bitsequences, and blocks of quantizod and variable length coded coefficient data bitsequences into the bitstream. The rate control feedback parameters can be calculated using a simple bitcounter mechanism which accurately counts the number of bits in the bitstream. Due to the relatively small size of the bitstream coder and its simple interfaces, it is suitable for inclusion in VLSI implementations of digital video encoders.

REFERENCES:
patent: 4728975 (1988-03-01), Hethium
patent: 4985766 (1991-01-01), Morrison et al.
Secretariat: Japan (JISC), "Coded Representation of Audio, Picture. Multimedia and Hypermedia Information," ISO/IEC JTC 1/SC 29 N 313, dated May 20, 1993.
Secretariat: Japan (JISC), "Coding of Audio, Picture, Multimedia and Hypermedia Information," ISO/IEC JTC 1/SC 29 N 0981 Rev, dated Mar. 31, 1995.
"Recommendation H.261 --Video Codec for Audiovisual Services at px 64 kbit/s", International Telegraph and Telephone Consulative Committee, Study Group XV--Report R 37, Aug. 1990.
"L64750/51 CCITT Variable Length Coder/Decoder", LSI Logic Integrated Circuit Data Sheet, Order Number 44023, Apr. 1991.

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