Musical tone waveshape generator

Details Musical tone waveshape generator Musical tone waveshape generator

1975-07-10

1977-07-19

Witkowski, Stanley J.

Music

Instruments

84 103, 84 122, 235152, 235197, G10H 100, G10H 500

Patent

active

040360962

ABSTRACT:
The invention is directed to a waveshape generator capable of producing a desired waveshape by previously storing basic amplitudes obtained by sampling one period of the waveshape at a coarse interval and calculating amplitudes with a fine interval between the basic amplitudes. While basic amplitudes A and B are sequentially produced at a coarse interval in response to an integer portion of the input data, a function X (c) is produced in response to a fraction portion of the input data. Waveshape amplitudes are interpolated between the basic amplitudes by carrying out calculation of A + (B - A) .times. X(c) in response to these values A, B and X(c). A special form of function X(c) is also used for applying interpolation by a partial waveshape of a trigonometric function wave. An example of a musical tone waveshape generator is also described in which different waveshapes are produced depending upon different tone ranges by moving the position of a radix point for each of the different tone ranges.

REFERENCES:
patent: 3515792 (1970-06-01), Deutsch
patent: 3809786 (1974-05-01), Deutsch
patent: 3821714 (1974-06-01), Tomisawa et al.
patent: 3823390 (1974-07-01), Tomisawa et al.
patent: 3831015 (1974-08-01), Hoff, Jr.
patent: 3882751 (1975-05-01), Tomisawa et al.

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