Keyboard latch for electronic organ

Details Keyboard latch for electronic organ Keyboard latch for electronic organ

1980-06-04

1983-03-01

Truhe, J. V.

Music

Instruments

84 103, 84 124, 84DIG2, G10H 100

Patent

active

043751768

ABSTRACT:
An electronic organ having a scanned keyboard manual (10) includes a keyboard latch (24) interposed between the scanning apparatus (12) and the organ keyers (26). The keyboard latch (24) comprises a gate (42) for comparing the serial data pulses, each of which represents a respective depressed key, produced at the output of the scanning apparatus (12) during each scan of the keyboard manual (10) with the serial data pulses produced during the immediately preceding scan for developing a control signal representing the detection of a depressed keyboard key during the on-going scan which was not depressed during the immediately preceding scan. An output circuit (52, 54, 56) is provided for continuously developing an output signal reflecting the keys depressed during the last scan in which a control signal was developed whereby the tone signals corresponding thereto are continuously sounded even though the keys have subsequently been released.

REFERENCES:
patent: 3781450 (1973-12-01), Nakajima
patent: 4055103 (1977-10-01), Machanian
patent: 4214500 (1980-07-01), Adachi et al.
patent: 4234784 (1980-11-01), Totterdell
patent: 4240317 (1980-12-01), Kmetz

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