Electronic musical instrument

Details Electronic musical instrument Electronic musical instrument

Filed on

1983-07-26

Date issued

1985-09-03

Examiner

Witkowski, S. J.

Patent Class

Music

SubClass

Instruments

Other Related Categories

84 113, G10H 1057

Type

Patent

Status

active

Patent number

045384967

Description

ABSTRACT:
The differentiation data of a basic waveform is read out from a differentiated value waveform memory at a clock timing corresponding to a musical scale of an operated play key, and it is multiplied by an envelope value of a musical sound waveform to form a musical sound waveform differentiation value. In parallel therewith, the differentiation data is accumulated at the clock timing to form a compensative value. The compensative value is added with the musical sound waveform differentiation value at the point of time at which the envelope value is changed to cancel a DC component which would otherwise develop in a produced musical sound waveform. The musical sound waveform differentiation values thus compensated are accumulated, and are subjected to digital-to-analog conversion, so that the musical sound waveform free from the DC component is produced.

REFERENCES:
patent: 4133242 (1979-01-01), Nagai et al.
patent: 4245541 (1981-01-01), Deutsch
patent: 4416178 (1983-11-01), Ishida
patent: 4442745 (1984-04-01), Gross et al.

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