Apparatus for extracting envelope data from an input waveform si

Details Apparatus for extracting envelope data from an input waveform si Apparatus for extracting envelope data from an input waveform si

1989-09-14

1990-09-25

Witkowski, Stanley J.

Music

Instruments

Electrical musical tone generation

84607, 84616, 84627, 84477R, G10H 1057, G10H 708

Patent

active

049585525

ABSTRACT:
An envelope extracting circuit extracts an envelope from the waveform sampled by a musical tone sampling circuit, and stores the envelope data into a memory. An envelope approximating circuit approximates the envelope data as stored in the memory by the function data such as linear or exponential function data. The original envelope is approximated by a limited number of function waveforms whose characteristics change at switching points.

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patent: 4696216 (1987-09-01), Asahi et al.
patent: 4754679 (1988-07-01), Suzuki

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