Music – Instruments
Patent
1978-06-20
1981-03-10
Witkowski, Stanley J.
Music
Instruments
84DIG8, 84DIG22, 84DIG23, G10H 138, G10H 500
Patent
active
042546826
ABSTRACT:
The notes of an accompaniment manual of an electronic keyboard musical instrument such as an electronic organ are multiplexed. The key switches are sequentially scanned and the serial information produced is fed into a shift register. Digital circuitry reads the position of data in the shift register to determine whether a recognized chord has been played. After recognition of a recognized chord a counter operating in conjunction with the shift register clock input operates in connection with comparators and frequency generators to produce the necessary notes for the chord played.
An automatic mode of operation also is provided in which only the key corresponding to the root partial of a chord need be played. By utilizing the mathematic relationships in a chord, the simple note played by depression of one key is extrapolated into a chord.
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Hoskinson William R.
Machanian William V.
The Wurlitzer Company
Witkowski Stanley J.
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