1977-08-24
1980-03-25
Witkowski, S. J.
Music
Instruments
84DIG2, 340166R, 340365S, G10H 100, H04J 100
Patent
active
041944259
ABSTRACT:
In a key code generator which has key code generator circuits, each corresponding to one of a plurality of key switches and composed of a memory circuit for storing the status of the key switch with a master clock pulse, a circuit for detecting the status change of the key switch to its depressed or release state, means for deriving a key code from the outputs of the memory circuit and the detecting circuit, means for producing a latch pulse from the master clock pulse and the key code and means for completing the output generation with the master clock pulse, a circuit for determining priority of the key code generator circuits, and a control circuit for giving priority to key release over key depression when key switches are simultaneously released and depressed, respectively, there is provided a time-division device which comprises a key switch (m.times.n) matrix circuit composed of the plurality of key switches inputting key switch information to the key code generator circuits, means for transferring the key switch information from the key switch matrix circuit every octave while time dividing the key switch information to m, and a control circuit for sequentially storing the key switch information in m blocks of the key code generator circuits, each block being composed of n key code generator circuits.
REFERENCES:
patent: 3929905 (1975-12-01), Moore
patent: 4019417 (1977-04-01), Carlson
patent: 4041825 (1977-08-01), Pascetta
patent: 4138916 (1979-02-01), Kitagawa
patent: 4138917 (1979-02-01), Sakashita et al.
patent: 4141268 (1979-02-01), Kugisawa
Kabushiki Kaisha Kawai Gakki Seisakusho
Witkowski S. J.
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