Octave phase decoupling in an electronic musical instrument

Details Octave phase decoupling in an electronic musical instrument Octave phase decoupling in an electronic musical instrument

1982-05-11

1984-04-17

Isen, Forester W.

Music

Instruments

84 122, 84 124, G10H 100

Patent

active

044427476

ABSTRACT:
Apparatus is described to control the starting phase of a new tone for a keyboard operated electronic musical instrument having a number of tone generators. An interval detection subsystem is used to determine if a new note is separated by a given musical interval, such as an octave, from a currently generated musical tone. If the prespecified separation is detected the new tone generator is initialized so that its starting waveshape phase is equal to that of its related interval neighbor. Provision is incorporated to shift the new tone generator by a random frequency offset to phase unlock the octave intervals.

REFERENCES:
patent: 3809786 (1974-05-01), Deutsch
patent: 4186637 (1980-02-01), Swain et al.
patent: 4386546 (1983-06-01), Fritz et al.

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