Quantization/inverse quantization unit selectably accommodating

Details Quantization/inverse quantization unit selectably accommodating Quantization/inverse quantization unit selectably accommodating

1997-04-25

1999-02-09

Chin, Stephen

Pulse or digital communications

Pulse code modulation

Differential

341200, 348405, 348410, 382251, G06K 938, H04B 1404, H04N 742, H03M 304

Patent

active

058704353

ABSTRACT:
Disclosed is a quantization/inverse quantization circuit including a differential pulse code modulator (DPCM). Video CODEC standards (i.e., JPEG, H.261, H.263, MPEG-1, and MPEG-2) include various functions for an image compression and an image reconstruction. The conventional quantization/inverse quantization circuit has been designed to be fit for only one desired standard, so that the quantization/inverse quantization circuit used for one standard cannot be directly used for another standard. Accordingly, in relation to a difference between standards and required function therebetween in order to use the present invention in all video CODEC standards, the present invention discloses a quantization/inverse quantization circuit which can support all modes (i.e., a quantization mode in coding, an inverse quantization mode in decoding, and a reconstruction mode) by employing one quantization circuit as a quantization/inverse quantization circuit which can be used in all video CODEC standards.

REFERENCES:
patent: 4491953 (1985-01-01), Bellisio et al.
patent: 5073820 (1991-12-01), Nakagawa et al.
patent: 5283646 (1994-02-01), Bruder
patent: 5295077 (1994-03-01), Fukuoka
patent: 5530478 (1996-06-01), Sasaki et al.
patent: 5614946 (1997-03-01), Fukuoka

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