One key chording system for electronic keyboard instrument

Details One key chording system for electronic keyboard instrument One key chording system for electronic keyboard instrument

1979-06-08

1981-06-23

Truhe, J. V.

Music

Instruments

84DIG22, 84DIG23, G10H 100

Patent

active

042743206

ABSTRACT:
A one key chording system for an electronic organ of the type in which single contact keyswitches for D.C. keying of tone signals are employed. The keyswitches of a first group are connected to a common bus to which is also connected a mode select circuit for selectively applying thereto a D.C. potential of either positive or negative polarity. In the disclosed embodiment, when a negative potential is applied to the common bus a signal from an actuated keyswitch in said first group operates one of a plurality of chord logic circuits to produce a plurality of auxiliary keying signals which operate tone signal keyers for tone signals corresponding to a musical chord. An alpha-numeric display disposed adjacent to the keyboard indicates the name of the chord being played by the one key chording system. When the mode select circuit is operated to apply a positive potential to the common bus, the chord logic circuits are rendered inoperative and the instrument is returned to normal operation with multiple key chording.

REFERENCES:
patent: 4054868 (1977-10-01), Rose
patent: 4203345 (1980-05-01), Collin et al.

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