Electronic keyboard musical instrument of wave memory reading ty

Details Electronic keyboard musical instrument of wave memory reading ty Electronic keyboard musical instrument of wave memory reading ty

1978-07-07

1981-03-31

Witkowski, S. J.

Music

Instruments

84 122, G10H 108, G10H 500, G10H 700

Patent

active

042586020

ABSTRACT:
In an electronic keyboard musical instrument, the operation of a key causes a corresponding frequency information signal to be read out of a frequency information memory. The frequency information signal represents a counting number and is repeatedly accumulated in an accumulator at a first clock rate. The accumulator generates carry signals at a frequency defining a tone frequency. A wave shape memory stores sample values of a wave shape, and a counter addresses this memory to read out the wave shape. The counter is driven at a second clock rate to successively address the sample values one after another, but is reset by the carry signals to restore it to its initial state. Thus the memory generates only those sample values of the wave shape which fall within the carry signal period from the beginning. The tone colors will vary from one tone frequency to another.

REFERENCES:
patent: 3515792 (1970-06-01), Deutsch
patent: 3979989 (1976-09-01), Tomisawa et al.
patent: 4077294 (1978-03-01), Hiyoshi et al.
patent: 4083283 (1978-04-01), Hiyoshi et al.
patent: 4108036 (1978-08-01), Slaymaker
patent: 4114498 (1978-09-01), Chibana et al.
patent: 4130043 (1978-12-01), Niimi
patent: 4133242 (1979-01-01), Nagai et al.
patent: 4133244 (1979-01-01), Hiyoshi et al.
patent: 4138915 (1979-02-01), Nagai et al.

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