Variable rate portamento system

Details Variable rate portamento system Variable rate portamento system

1977-02-22

1980-06-17

Witkowski, S. J.

Music

Instruments

84DIG10, 324 82, 324 83FE, G01R 2312, G01R 2504, G10H 102

Patent

active

042077931

ABSTRACT:
A portamento system is disclosed for use with an electronic musical instrument, and particularly with a monotonic keyboard instrument which utilizes master oscillator/divider elements for tone generation. The portamento system utilizes a voltage controlled oscillator, and an oscillator control circuit comprising a unique combination of a phase/frequency detector and a circuit for varying and controlling lock up rate and expanding the frequency range of the system which may be either a ramp and hold circuit or a frequency tachometer circuit. The voltage controlled oscillator is thus locked on to the input frequency from the electronic musical instrument with substantially zero phase and frequency error. The system is capable of reaching the input frequency as slowly or as rapidly as desired and will operate over a wide frequency range. A unique system control and interfacing system is also provided whereby the portamento system may be utilized with a plurality of voices of the electronic musical instrument and several modes of operation may be selectively utilized.

REFERENCES:
patent: 3347973 (1967-10-01), Freeman
patent: 3472116 (1969-10-01), Schott
patent: 3800060 (1974-03-01), Hallman, Jr.
patent: 3956961 (1976-05-01), Peterson
patent: 4058042 (1977-11-01), Wade et al.
patent: 4063484 (1977-12-01), Robinson
patent: 4073209 (1978-02-01), Whittington et al.
patent: 4077298 (1978-03-01), Kondo
patent: 4082028 (1978-04-01), Deutsch
patent: 4103581 (1978-08-01), Deutsch

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