Variable lengthcoding apparatus and variable length decoding app

Details Variable lengthcoding apparatus and variable length decoding app Variable lengthcoding apparatus and variable length decoding app

1991-07-15

1994-04-19

Logan, Sharon D.

Coded data generation or conversion

Digital code to digital code converters

To or from variable length codes

341106, H03M 740, H03M 742

Patent

active

053049950

ABSTRACT:
A variable length coding apparatus comprises a register for holding a current condition, a ROM for outputting the to-be-transited next state and one data in accordance with a predetermined state transition, a selector for inputting the state corresponding to the information signal value to the register every time the to-be-coded information signal is inputted, and a circuit to feed back the state outputted from the ROM to the register, and the ROM outputs the variable length codes corresponding to the information signal as the above-mentioned data every time the state transits.

REFERENCES:
patent: 4060797 (1977-11-01), Maxwell et al.
patent: 4161757 (1979-07-01), Spencer et al.
patent: 4177456 (1979-12-01), Fukinuki et al.
patent: 4396906 (1983-08-01), Weaver
patent: 4568916 (1986-02-01), Bahgat
patent: 4591829 (1986-05-01), Takeda
M. E. Lukacs, "Variable Word Length Coding for a High Data Rate DPCM Video Coder," Proc. of Picture Coding Symposium, 1986, pp. 54-56.
Patent Abstracts of Japan, vol. 12, No. 367(E-644), Sep. 30, 1988, & JP-A-63-117564, May 21, 1988, K. Nakajima, "Huffman Coder".
H. Fujiwara et al, "VLSI Implementation of a Flexible Variable-Length Decoding Processer for Real-time Video," Third international workshop on 64 kbit/s coding of moving video, 1990.

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