Variable length coding with three-field codes

Details Variable length coding with three-field codes Variable length coding with three-field codes

1995-05-08

1997-07-15

Williams, Howard L.

Coded data generation or conversion

Digital code to digital code converters

To or from variable length codes

341 65, H03M 740

Patent

active

056487746

ABSTRACT:
The present invention relates to variable length coding (VLC). Variable length coding is a widely-used method in data compression, especially, in the applications of video data communication and storage. Many international standards have adopted this technique in video data compression, for example, JPEG, MPEG, CCITT H.261 and so on. Various implementation methods have been proposed for variable length coding. Most of those methods implement the coding with two-field codes. That is, a code is represented by a code word and a code length. However, in this invention, a three-field representation is used for each code. In comparison with the two-field method, this method not only reduces the storage requirements of the code-book but also reduces the hardware or cost to implement a variable length encoder. Moreover, variable length coding can be implemented using both parallel VLC encoders and serial VLC encoders.

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patent: 4922510 (1990-05-01), Bruzewitz
patent: 4985700 (1991-01-01), Mikami
patent: 5006930 (1991-04-01), Stroppiana et al.
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patent: 5162795 (1992-11-01), Shirota
patent: 5179442 (1993-01-01), Azadegan et al.
patent: 5226082 (1993-07-01), Kustka
patent: 5253053 (1993-10-01), Chu et al.
"An Entropy Coding System for Digital HDTV Applications", IEEE Transactions On Circuits And Systems For Video Technology, vol. 1, No. 1, Shaw-Min Lei, Member, IEEE, and Ming-Ting Sun, Senior Member, IEEE (1991).

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