Microcomputer interfaced electronic organ

Details Microcomputer interfaced electronic organ Microcomputer interfaced electronic organ

1981-06-22

1983-09-13

Isen, F. W.

Music

Instruments

84 117, 84 103, G10H 100

Patent

active

044035365

ABSTRACT:
An electronic keyboard musical instrument comprising a multiplexed keyboard and a programmable microcomputer interfaced between the keyboard and a system of capture tone generators. The loading circuitry for the microcomputer, which is interposed between it and the keyboard multiplexer output, monitors the serial data stream and transmits only key change information to the microcomputer. If a keydown signal appears in a time slot where that time slot was previously empty, a multiple bit binary word identifying that time slot and indicating that it is a keydown condition is transmitted to the microcomputer. Similarly, if a keydown pulse disappears from a time slot when a pulse was previously present, a similar code is transmitted to the microcomputer indicating that the key is no longer depressed. The microcomputer controls the assignment and deassignment of tone generators for the accompaniment, solo and pedal manuals based on the key change information transmitted to it.

REFERENCES:
patent: 3610799 (1971-10-01), Watson
patent: 3915047 (1975-10-01), Davis et al.
patent: 3926087 (1975-12-01), Griffis
patent: 4022098 (1977-05-01), Deutsch et al.
patent: 4041825 (1977-08-01), Pascetta
patent: 4164020 (1979-08-01), Griffith
patent: 4184400 (1980-01-01), Niimi
patent: 4202234 (1980-05-01), Comerford
patent: 4215343 (1980-07-01), Ejiri et al.
patent: 4251619 (1980-08-01), Budelman et al.
patent: 4343216 (1982-08-01), Swain et al.

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