Electronic musical instrument

Details Electronic musical instrument Electronic musical instrument

1975-11-11

1976-11-30

Weldon, Ulysses

Music

Instruments

84DIG4, 84 103, G10H 102

Patent

active

039941957

ABSTRACT:
An electronic musical instrument capable of producing a multi-system tone source effect which is an effect providing a musical tone with naturalness and resulting from simultaneous playing of a tone of a proper pitch and a tone of a pitch slightly different from the proper pitch. The inventive electronic musical instrument produces this effect with a smaller number of tone source devices than the number of systems.
Composite musical tone waveshape amplitudes achieving the multi-system tone source effect can be represented by a single multiplication term of a sine waveshape function content corresponding to a certain pitch and a cosine waveshape function content corresponding to a pitch difference. According to the invention, the sine waveshape function content and the cosine waveshape function content are separately produced and these contents are multiplied with each other to produce the composite musical tone waveshape amplitudes. An embodiment in which the two contents can be added together by expressing them in logarithm is also described.

REFERENCES:
patent: 3809786 (1974-05-01), Deutsch
patent: 3809788 (1974-05-01), Deutsch
patent: 3809790 (1974-05-01), Deutsch
patent: 3809792 (1974-05-01), Deutsch
patent: 3910150 (1975-10-01), Deutsch et al.

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