Television – Bandwidth reduction system – Data rate reduction
Patent
1996-12-27
1998-01-27
Britton, Howard W.
Television
Bandwidth reduction system
Data rate reduction
341106, 348419, H04N 740
Patent
active
057126860
ABSTRACT:
An inverse quantizer, for use in an MPEG-2 video signal decoder, provides a 23-bit inverse quantized transform coefficient F in response to 13-bit )!/32 wherein QF is a quantized transform coefficient, W is an element of a predetermined weight matrix, and the quantizer.sub.-- scale is an integer ranging from 1 to 112 as given in MPEG-2 scheme. The inverse quantizer comprises a quantizer.sub.-- scale providing block for providing a (7-L)-bit modified quantizer.sub.-- scale and a selection signal based on the quantizer.sub.-- scale; a first multiplier for multiplying the modified quantizer.sub.-- scale with W, to provide a (15-L)-bit quantization step size; a second multiplier for multiplying (2QF+K) with the quantization step size, to provide a (28-L) bit output; a bit appending block for appending L zero bits to the output of the second multiplier, to provide a set of (L+1) 28-bit values; a multiplexor for selecting one of the (L+) 28-bit values in response to the selection signal; and a divider for dividing the selected 28-bit value by "2.sup.5 ", to thereby provide 23-bit F.
REFERENCES:
patent: 5089888 (1992-02-01), Zdepski
patent: 5295077 (1994-03-01), Fukuoka
patent: 5426463 (1995-06-01), Reininger
Britton Howard W.
Daewoo Electronics Co. Ltd.
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