Frequency number controlled clocks

Details Frequency number controlled clocks Frequency number controlled clocks

1975-11-24

1978-01-10

Schaefer, Robert K.

Music

Instruments

Automatic

84 122, G10H 100

Patent

active

040672549

ABSTRACT:
In a musical polyphonic tone synthesizer, musical waveshapes are produced by voltage controlled oscillators. The analog frequency control voltages are created by converting stored digital numbers to analog voltages. The selection of these digital numbers and their assignment to a plurality of voltage controlled oscillators is controlled by detecting switches actuated on a keyboard. Provision is made for operating the oscillators over the full frequency range of an electronic musical instrument's keyboard. Automatic tuning means is incorporated to adjust the conversion reference voltage for each oscillator to keep the musical instrument in tune by locking the set of voltage controlled oscillators to a stable reference oscillator. Tuning the reference oscillator thereby tunes the set of voltage controlled oscillators while retaining equal tempered musical frequencies.

REFERENCES:
patent: 3659031 (1972-07-01), Adachi
patent: 3719767 (1973-03-01), Matumoto
patent: 3781450 (1973-12-01), Nakajima
patent: 3821712 (1974-06-01), Wetzel
patent: 3836692 (1974-09-01), Nakajima

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