Chord playing organ

Claim 2

In a chord playing organ having keyboards in the form of upper and lower manuals and a pedal keyboard; tone generator means having a plurality of terminals for supplying tone signals at respective pitches, electroacoustic transducer means for converting said tone signals to sound, key switches operated by the keys of said keyboards, an electrically operated keyer interposed between each said terminal and said transducer means and each having a control terminal, first two input gates each having an output side connected to respective ones of said control terminals groups of second two input gates each having an output side connected to a selected group of said control terminals, each of a selected group of key switches being connected to one input of a respective said first gate and to one input of each gate of a selected said group of second gates, and selector switch means having one output terminal connected to the other input of said first gates and another output connected to the other inputs of said second gates whereby in one position of said selector switch means actuation of each of a selected group of key switches will cause the supply of a single tone signal from said tone generator to said transducer means while in another position of said selector switch means, actuation of each of a selected group of key switches will cause the supply of a group of tones from said tone generator to said transducer means.

Claim 3

A chord playing organ according to claim 1 in which each keyer includes a control terminal to which signals are supplied to actuate the keyer, each said gate being a NAND gate, and a signal invertor connected to each control terminal and through which the respective keyer is actuated by signals from said gates.

Claim 4

A chord playing organ according to claim 2 in which the side of each keY switch opposite the connection thereof to the said gate inputs and the side of said selector switch means opposite the said output terminals thereof are connected to a source of signal voltage for said gates.

Claim 5

A chord playing organ according to claim 1 in which each said selected group of control terminals pertains to a group of tones making up a chord.

Claim 6

A chord playing electronic organ according to claim 2 in which said second NAND gates are in groups and the said one input of each of the gates of a said group is connected to one side of a respective playing key operated switch, the output of each of said group of gates being connected to the input side of a respective invertor of a group of invertors pertaining to keyers making up a musical chord.

Claim 7

In a chord playing electronic organ: a tone generator having a plurality of terminals supplying tone signals at respective pitches, electroacoustic transducer means for converting said tone signals to sound, a plurality of keyers having inputs connected to said terminals and outputs connected to said transducer means and each having a control terminal operable to actuate the keyer in response to a voltage signal, an invertor for each keyer having an output side connected to the control terminal of the respective keyer, and also having an input side, a plurality of playing keys, a playing key switch for each playing key and each having one side connected to a source of voltage and the other side in circuit with the input side of a respective invertor and actuated by actuation of the respective playing key, a plurality of first two input NAND gates each having one input connected to the said other side of a respective one of a selected group of said playing key switches and the output connected to the input side of the invertor pertaining to the respective playing key switch, a plurality second of two input NAND gates each having one input connected to the said other side of a respective one of said selected group of playing key switches and the output connected to the input side of a selected invertor, a selector switch blade connected to a source of voltage, a first contact connected to the other inputs of said first NAND gates and a second contact connected to the other inputs of said second NAND gates, said selector switch blade being selectively moveable into engagement with either of said contacts whereby said selected group of playing keys will play single notes or chords depending on the position of said selector switch blade.

Claim 8

In a chord playing electronic organ: a tone generator having a plurality of terminals supplying tone signals at respective pitches, electroacoustic transducer means for converting said tone signals to sound, a plurality of keyers having inputs connected to said terminals and outputs connected to said transducer means and each having a control terminal operable to actuate the keyer in response to a voltage signal, an invertor for each keyer having an output side connected to the control terminal of the respective keyer, and also having an input side, a plurality of playing keys, a playing key switch for each playing key and each having one side connected to a source of voltage and the other side in circuit with the input side of a respective invertor and actuated by actuation of the respective playing key, a plurality of first two input NAND gates each having one input connected to the said other side of a respective one of a selected group of said playing key switches and the output connected to the input side of the invertor pertaining to the respective playing key switch, a plurality second of two input NAND gates each having one input connected to the said other side of a respective one of said selected group of playing key switches and the output connected to the input side of a selected invertor, a selector switch blade connected to a source of voltage, a first contact connected to the other inputs of said first NAND gates and a second contact connected to the other inputs of said second NAND gates, said selector switch blade being selectively moveable into engagement with either of said contacts whereby said selected group of playing keys will play single notes or chords depending on the position of said selector switch blade.