Variable length code word decoder for use in digital communicati

Details Variable length code word decoder for use in digital communicati Variable length code word decoder for use in digital communicati

1992-03-26

1993-08-03

Hoff, Marc S.

Coded data generation or conversion

Digital code to digital code converters

To or from variable length codes

341 65, H03M 740

Patent

active

052333485

ABSTRACT:
Apparatus is provided for decoding variable length code words to recover transform coefficients, such as DCT transform coefficients provided by a high definition television encoder. A first category of the code words has a length of no more than n bits. A second category has a length of greater than n bits. A feedback ROM is used to decode the code words. Code words from the first category are processed by directly addressing a lookup table in the ROM. Code words from the second category are processed using multiple passes through the ROM, wherein a portion of the data output during a prior pass is fed back to address the memory during a subsequent pass.

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patent: 5138315 (1992-08-01), LeQueau et al.
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patent: 5140322 (1992-08-01), Sakagami
Ming L. Liou, "Visual Telephony as an ISDN Application," IEEE Communications Magazine, Feb. 1990.

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