Keyboard switch detect and assignor

Details Keyboard switch detect and assignor Keyboard switch detect and assignor

1975-10-06

1977-05-10

Hix, L. T.

Music

Instruments

84 101, G10F 100

Patent

active

040220982

ABSTRACT:
Keyboard switches are arranged in groups of P switches, Q groups per set, and S sets per keying system. During a search cycle, each group of P switches is sequentially examined to detect a change in a switch state of any member since the preceding search cycle. A change in switch state causes system to enter an assign mode cycle during which a data word is created in memory corresponding to a newly detected switch closure, or is removed from memory corresponding to a newly detected switch opening. Provision is incorporated for coupling between switch groups and switch sets. After an assignment has been completed, system returns to a search cycle. The system is particularly useful in a keyboard musical instrument.

REFERENCES:
patent: 3700781 (1972-10-01), Obatashi
patent: 3746773 (1973-07-01), Uetrecht
patent: 3752898 (1973-08-01), Obatashi
patent: 3794747 (1974-02-01), Obatashi
patent: 3842184 (1974-10-01), Kniepkamp et al.
patent: 3882751 (1975-05-01), Tomisaua et al.
patent: 3899951 (1975-08-01), Griffith et al.
patent: 3902397 (1975-09-01), Morez et al.

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