Tone generator for electronic musical instrument including multi

Details Tone generator for electronic musical instrument including multi Tone generator for electronic musical instrument including multi

1994-03-24

1996-03-05

Witkowski, Stanley J.

Music

Instruments

Electrical musical tone generation

84661, 84DIG9, 84DIG10, G10H 108, G10H 112

Patent

active

054969646

ABSTRACT:
A tone generator for an electronic musical instrument is fundamentally configured by a drive-waveform creating portion and a closed loop. The drive-waveform creating portion creates a drive-waveform signal by mixing an excitation waveform and a noise waveform together. The drive-waveform signal is applied to the closed loop through an adder. The closed loop contains a plurality of feedback paths, each of which at least contains a delay circuit and an all-pass filter. The adder adds all of output signals of the feedback paths together with the drive-waveform signal so as to produce a musical tone signal. The number of delay stages, representing an amount of delay to be used in each delay circuit provided in each feedback path, is designated in response to a delay ratio which is arbitrarily set. Since the signal repeatedly circulates through the closed loop containing a plurality of feedback paths, each having a specific signal processing function, the musical tone signal to be produced has a rich amount of overtone components.

REFERENCES:
patent: 5223657 (1993-06-01), Takeuchi
patent: 5290969 (1994-03-01), Kobayashi
patent: 5308918 (1994-03-01), Yamauchi et al.
patent: 5352849 (1994-10-01), Kobayashi et al.
patent: 5382751 (1995-01-01), Kitayama et al.

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