Communications: electrical – Audible indication – Percussion-type sound producer
Patent
1980-05-30
1981-07-28
Miller, Charles D.
Communications: electrical
Audible indication
Percussion-type sound producer
375 34, 340347AD, G06F 506
Patent
active
042813182
ABSTRACT:
A digital-to-digital converter is arranged to provide "decimated" output samples at rate f.sub.0, 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 is achievable in integrated circuit form using first and second serially connected accumulators, the first accumulating m input samples without weighting and the second being used to weight the samples so that the first 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 subtracted therefrom. The difference is delayed 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.
REFERENCES:
patent: 3793513 (1974-02-01), Kaneko
patent: 4002981 (1977-01-01), Eggermont
patent: 4032914 (1977-06-01), Candy
patent: 4167731 (1979-09-01), Eggermont
Goodman "The Bell System Technical Journal", vol. 48, No. 2, Feb. 1969, pp. 321-343.
Candy "IEEE Transactions on Communications", Nov. 1976, pp. 1268-1275.
Candy James C.
Wooley Bruce A.
Bell Telephone Laboratories Incorporated
Freedman Barry H.
Miller Charles D.
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