Electronic musical instrument

Details Electronic musical instrument Electronic musical instrument

1975-05-27

1976-09-14

Jackmon, E. S.

Music

Instruments

84 125, G04H 104

Patent

active

039799891

ABSTRACT:
In a digital type electronic musical instrument in which frequency information corresponding to a depressed key is cumulatively counted and a musical tone waveshape is read from a memory by the resultant output of the cumulative counting, modified frequency information is produced by adding to or subtracting from said frequency information second frequency information represented by a predetermined frequency difference. A tone of a pitch which is slightly different from a normal pitch is generated from this modified frequency information for producing a beat effect between notes in an octave relation. The pitch can be controlled by suitably adjusting the second frequency information. Different beat effects can be produced for respective keyboards by varying the second frequency information by each keyboard. According to an alternative embodiment of the invention, two or more sets of tone reproduction systems are provided and the beat effect is produced by depression of a single key by varying modified frequency information for the respective tone reproduction systems.

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), Banger
patent: 3809786 (1974-05-01), Deutsch
patent: 3871261 (1975-03-01), Wells et al.
patent: 3882751 (1974-05-01), Tomisawa

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