Music – Instruments
Patent
1976-08-26
1977-12-27
Witkowski, Stanley J.
Music
Instruments
84DIG2, 84DIG12, 84DIG20, 84DIG22, G10H 100, G10H 506
Patent
active
040647773
ABSTRACT:
A circuit in an electronic keyboard musical instrument for preferentially selecting the highest and lowest tones from among the tones in chords produced by keys on the keyboard which have been struck. The circuit has a set of series connected resistors having equal values, the number of resistors in the set corresponding to the number of tones from which the highest and lowest tones are to be selected. An end resistor is connected between each end of the set of resistors and a reference voltage level. A plurality of transistors corresponding to the number of resistors each has the emitter thereof connected to the set of resistors between the corresponding resistor and the resistor corresponding to the next adjacent transistor, and has the collector thereof adapted to receive a corresponding tone signal. A keyswitch is connected to the base of each transistor and to a bias source. Switches are connected to each end of the series of resistors for being alternately opened and closed in synchronism, and a shaping and amplifying circuit is coupled to these switches for alternately receiving signals from opposite ends of the set of resistors.
REFERENCES:
patent: 3766305 (1973-10-01), Schrecongost
patent: 3880039 (1975-04-01), Studer
patent: 3906830 (1975-09-01), Mathias
Roland Corporation
Witkowski Stanley J.
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