Method for arithmetic decoding

Details Method for arithmetic decoding Method for arithmetic decoding

1995-08-21

1998-04-07

Baker, Stephen M.

Excavating

H03M 1312

Patent

active

057373450

ABSTRACT:
A method for arithmetic decoding improves the reliability of the arithmetic coding. For the purpose of channel decoding, use is made of a soft output Viterbi algorithm which, along-side the decided data item, supplies an item of reliability information. In addition, a data item is predicted for the decided data item in accordance with channel-decoded and arithmetically decoded data already transmitted, and subsequently arithmetically coded and compared with the channel-decoded data item. If the two data items do not correspond, the distribution density function used for the arithmetic decoding is changed by using the reliability information, and the channel-decoded data item is subsequently arithmetically decoded using the new distribution density function.

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Langdon, "An Introduction to Arithmetic Coding", IBM Journal of Research and Development, vol. 28, No. 2, Mar. 1984, pp. 135-149.
R. Mann Pelz, "Bild- und Sprach ubertragung in Mobilfunk-kan alen" (Transmission of Image and speech in Mobile Radio Telephone Channels), Nachrichtentechnik, Elektronik, Berlin 42, 1992, p. 7 ff.
I.H. Witten, et al., "Arithmetic Coding for Datacompression", Communications of the ACM, Computing Practices, Jun. 1987, vol. 30, No. 6, p. 520 ff.
Hagenauer "A Viterbi Algorithm with Soft-Decision Outputs and its Applications", Global Telecommunications Conference, Dallas, 1989, p., 1680 ff.

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