G - Physics – 06 – F
Patent
G - Physics
06
F
354/67
G06F 5/00 (2006.01) G06F 7/544 (2006.01) H03H 17/06 (2006.01)
Patent
CA 1156368
CANDY ? - 20 - DIGITAL-TO-DIGITAL CODE CONVERTER Abstract of the Disclosure A digital-to-digital converter is arranged to provide "decimated" output samples at rate fO, each of which represent a group of input samples received at a rate m times greater. Each output is generated using overlapped triangularly weighted accumulation on an interval including 2m preceding input samples. The samples near the beginning and end of each accumulation interval receive the smallest weight, and the samples at the middle of the interval receive the greatest weight. The converter comprises first and second serially connected accumulators, the first accumulator accumulating m input samples without weighting and the second accumulator being used to weight the samples so that the first accumulator receives m times the weight of the last sample. The output of the first accumulator is increased in scale by the factor "m" and the output of the second accumulator is subtracted therefrom in subtractor. The difference is delayed in store so that the next m samples may be accumulated. The output of the second accumulator is then combined with the delayed subtractor output to yield the desired overlapped, triangularly weighted accumulation. FIG. 1
376628
Candy James C.
Wooley Bruce A.
Kirby Eades Gale Baker
Western Electric Company Incorporated
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