1977-06-30
1979-02-13
Schaefer, Robert K.
Music
Instruments
84 103, 84 124, 84DIG2, 340365R, G10H 100
Patent
active
041389174
ABSTRACT:
A key code generator for electronic musical instruments which has a switch matrix circuit having a plurality of switches disposed at the intersections of two sets of buses, means for simultaneously applying signals to the switch matrix circuit from one of the two sets of buses to derive outputs from a plurality of blocks into which the buses of the other set are divided line by line, a memory for detecting the blocks that even one switch is in the on state from the bus outputs of the switch matrix circuit and temporarily storing signals of the detected blocks, a first priority selector for selecting block signals in a predetermined order of priority from the bus outputs and sequentially outputting the block signals with a predetermined clock pulse, means for inhibiting the block detecting operation during outputting from the first priority selector and applying the selected block signals to the buses of the detected blocks to sequentially scan only the detected blocks, a second priority selector for selecting switch signals in a predetermined order of priority from respective switch signals of the scanned blocks and sequentially outputting the switch signals with a predetermined clock pulse, and means for preventing clock pulses from inputting to the first priority selector until the switch signals of each designated block are all outputted.
REFERENCES:
patent: 4022098 (1977-05-01), Deutsch
patent: 4041825 (1977-08-01), Pasceita
Kitagawa Hiroshi
Sakashita Noriji
Kabushiki Kaisha Kawai Gakki Seisakusho
Pojunas, Jr. Leonard W.
Schaefer Robert K.
LandOfFree
Key code generator does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Key code generator, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Key code generator will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-685892