Apparatus for quantizing an input group of data samples into one

Details Apparatus for quantizing an input group of data samples into one Apparatus for quantizing an input group of data samples into one

1993-03-11

1994-05-17

Fleming, Michael R.

G10L 904

Patent

active

053135520

ABSTRACT:
A quantizer, which converts an input group of data samples into one of N quantized groups of data samples, does so by performing several dot products and compares. Each dot product is between the input group of data samples and a reference group of data samples u.sub.x, and each compare is with the dot product result and a constant k.sub.y. All of the reference groups of data samples and all of the constants are stored in a memory. This memory holds only N-1 constants and less then N/2 reference groups of data samples. A memory saving of several thousand percent is achieved by limiting the memory to hold no more then 2r reference groups of data samples where r is the number of samples in the input group, or no more then 2 log.sub.2 N reference groups of data samples.

REFERENCES:
patent: 4907276 (1990-03-01), Aldersberg
patent: 4972483 (1990-11-01), Carey
patent: 5021971 (1991-06-01), Lindsay
patent: 5054073 (1991-10-01), Yazu

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