Electronic musical instrument

Details Electronic musical instrument Electronic musical instrument

1975-05-27

1976-09-14

Jackmon, E. S.

Music

Instruments

84 101, G04H 104

Patent

active

039799964

ABSTRACT:
In a digital type electronic musical instrument in which basic frequency is cumulatively counted and a musical tone waveshape is read from a memory by the resultant output of the cumulative counting, a desired vibrato effect is produced by digitally frequency-modulating the basic frequency. Vibrato information for effecting the frequency-modulation is produced from a vibrato code obtained by counting a clock pulse and a vibrato depth signal and has contents which change as time elapses. The frequency-modulation is made by multiplying the basic frequency with the vibrato information. The vibrato depth may be controlled for each individual keyboard. Vibrato frequency may be changed by changing the frequency of the clock pulse for each keyboard. According to an embodiment of the invention, the vibrato depth progressively increases from the start of reproduction of the musical tone. The speed of change of the vibrato depth may also be controlled for each individual keyboard.

REFERENCES:
patent: 3413403 (1968-11-01), Jacob
patent: 3610801 (1971-10-01), Fredkin
patent: 3697661 (1972-10-01), Deutsch
patent: 3800060 (1974-03-01), Hallman, Jr.
patent: 3801721 (1974-04-01), Bunger
patent: 3809786 (1974-05-01), Deutsch
patent: 3871261 (1975-03-01), Wells et al.
patent: 3882751 (1974-05-01), Tomisawa

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