Music – Instruments
Patent
1977-07-19
1979-03-06
Schaefer, Robert K.
Music
Instruments
84 126, 84DIG8, G10H 102, 307
Patent
active
041424379
ABSTRACT:
An envelope circuit for a keyboard type electronic musical instrument having a damping and sustain characteristic. The circuit has a keyswitch operated in association with the actuation of a key on the keyboard of the electronic musical instrument to connect a power supply to a voltage responsive circuit for producing a decreasing volume output tone. A sustain circuit is coupled to the voltage responsive circuit for sustaining the operation of the voltage responsive circuit and is connected through a blocking diode to a sustain switch common to all the envelope circuits in the musical instrument. The sustain switch is connected in the sustain circuit for bypassing the voltage supplied thereto from a time constant circuit when the sustain switch is closed for making the sustain circuit inoperative to deenergize the voltage responsive circuit, whereby the voltage responsive circuit continues to produce an output tone independently of how the keyswitch is restored to its initial position. There can thus be realized a musical tone effect the same as that produced by the sustain pedal of a piano.
REFERENCES:
patent: 3557296 (1971-01-01), Hirose
patent: 3602628 (1971-08-01), Peterson
patent: 3634594 (1972-01-01), Hiyama
patent: 3651730 (1972-03-01), Adachi
patent: 3816636 (1974-06-01), Peliz
Miska Vit W.
Roland Corporation
Schaefer Robert K.
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