Encoding and decoding devices with predictor and detector

Details Encoding and decoding devices with predictor and detector Encoding and decoding devices with predictor and detector

1992-04-20

1994-05-17

Young, Brian K.

Coded data generation or conversion

Digital code to digital code converters

To or from code based on probability

341 51, H03M 700

Patent

active

053132041

ABSTRACT:
Encoding and decoding devices which are capable of increasing the encoding and decoding speed. In arithmetic encoding, there is a possibility of encoding with high efficiency which is very close to the entropy of the information source, but the encoding and decoding time is generally longer than that in another encoding systems such as an MMR encoding system. For example, in a standard facsimile equipment, about 1.3 sec is required for encoding the picture information in an A4-size copy. In prediction encoding, a memory for storing the past reference symbols and the predicted values therefor is necessary for prediction. Since the memory capacity is generally large, a large-capacity RAM is used. The encoding time is therefore greatly dependent on the access speed of the RAM. In the present invention, a high-speed register for storing the predicted value for a special symbol pattern is provided separately from the RAM so that the predicted value of the special symbol pattern is read from this register, thereby enabling high-speed encoding.

REFERENCES:
patent: 4363036 (1982-12-01), Subramaniam
patent: 5142283 (1992-08-01), Chevion et al.
patent: 5155594 (1992-10-01), Bernstein et al.
European Search Report, Feb. 1993.
A Multi-Purpose VLSI chip for adaptive data compression of bi-level images by Arps, et al. -IBM J. Res. Develop. vol. 32 Nov. 1988.

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