Digital envelope modulator for digital waveform

Details Digital envelope modulator for digital waveform Digital envelope modulator for digital waveform

1980-04-28

1981-09-08

Truhe, J. V.

Music

Instruments

84 113, G10H 102

Patent

active

042878055

ABSTRACT:
An envelope is imposed on a sequence of binary waveform samples representing a musical waveform signal by repetitively summing selected ones of a group of scaled representations of each of the waveform samples of the form A/2.sup.m, A/2.sup.m+1 . . . A/2.sup.m+p, where A represents the magnitude of the waveform sample, p is a predetermined integer, and m is an integer changing by a factor of unity each time a predetermined number of the groups have been developed. The sum of each group of scaled representations differs from the sum of the preceding group by the factor A/2.sup.m+p whereby a staircase signal is produced amplitude modulating the musical waveform signal, the step size of the staircase signal charging each time said predetermined number of groups have been developed.

REFERENCES:
patent: 3515792 (1970-06-01), Deutsch
patent: 3610805 (1971-10-01), Watson et al.
patent: 4031377 (1977-06-01), Deutsch et al.
patent: 4079650 (1978-03-01), Deutsch et al.
patent: 4135424 (1979-01-01), Okamoto
patent: 4144789 (1979-03-01), Deutsch
patent: 4154133 (1979-05-01), Kitawaga
patent: 4185532 (1980-01-01), Hiyoshi et al.
patent: 4205575 (1980-06-01), Hoskinson et al.

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