Electronic musical instrument

Details Electronic musical instrument Electronic musical instrument

1975-05-27

1977-05-31

Scott, James R.

Music

Instruments

84 101, G04H 104

Patent

active

040261808

ABSTRACT:
In a digital type electronic musical instrument in which basic 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, a musical tone including a coarse noise is produced by randomly frequency-modulating the basic frequency of the musical tone, thereby providing the tone with a random vibrato effect. The frequency-modulation is effected by randomly adding or subtracting information expressed in the form of a certain frequency difference relative to the basic frequency information to or from the basic frequency information. According to an embodiment of the invention, a noise effect is produced only during a rise portion of the musical tone by reducing noise component in steps from the start of depression of a key and reproducing a musical tone of a normal pitch after a lapse of a predetermined period of time. The degree of the noise effect can be controlled for each individual keyboard.

REFERENCES:
patent: 3515792 (1970-06-01), Deutsch
patent: 3743755 (1973-07-01), Watson
patent: 3767833 (1973-10-01), Noble et al.
patent: 3801721 (1974-04-01), Bunger
patent: 3821714 (1974-06-01), Tomisawa et al.
patent: 3844379 (1974-10-01), Tomisawa et al.
patent: 3929053 (1975-12-01), Deutsch

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