Alternating repeat keying signal generator
AssigneeNorlin Industries, Inc.
InventorsWilliam Wangard, David Starkey
Life of this patent
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Abstract
A circuit for generating alternating repeat keying signals in an electronic keyboard musical instrument includes a clock, a logic circuit responsive to the keys of the instrument and to the clock for producing an alternating sequence of logic signals corresponding to each of the keys, the phase of the sequence corresponding to each undepressed key being the same as the phase of the sequence corresponding to the previous key and the phase of the sequence corresponding to each depressed key being opposite that of the phase of the sequence corresponding to the previous key and a plurality of output gates each developing a keying signal in response to the depression of a respective one of the keys and the logic signals of the corresponding sequence assuming a predetermined state.
Claims12
In an electronic musical instrument having a plurality of playing keys and keying means associable with each of the keys, apparatus for producing alternating repeat keying signals comprising:
- means for generating a clock signal;
- logic means responsive to said keys and to said clock signal for producing an alternating sequence of logic signals corresponding to each of said keys, the phase of the sequence corresponding to each undepressed key being the same as the phase of the sequence corresponding to the previous key and the phase of the sequence corresponding to each depressed key being opposite that of the phase of the sequence corresponding to the previous key;
- and
- gate means for coupling a keying signal to the keying means associated with a depressed key in response to the logic signals of the corresponding sequence assuming a predetermined state.
In an electronic musical instrument of the type having a plurality of playing keys, apparatus for producing alternating repeat keying signals comprising:
- means for generating a clock signal;
- logic means responsive to said keys and to said clock signal for producing an alternating sequence of logic signals corresponding to each of said keys, the phase of the sequence corresponding to each undepressed key being the same as the phase of the sequence corresponding to the previous key and the phase of the sequence corresponding to each depressed key being opposite that of the phase of the sequence corresponding to the previous key;
- and
- a plurality of gate means each developing a keying signal in response to the depression of a respective one of said keys and the logic signals of the corresponding sequence assuming a predetermined state.
In an electronic musical instrument of the type having a plurality of playing keys, apparatus for producing alternating repeat keying signals comprising:
- means for generating a clock signal;
- a succession of exclusive OR gates each having a first input coupled to a respective one of said keys, the first of said exclusive OR gates having a second input receiving said clock signal and the remaining exclusive OR gates each having a second input coupled to the output of the preceding exclusive OR gate;
- and
- a plurality of gate means each developing a keying signal in response to the depression of a respective one of said keys and the output of the associated exclusive OR gate assuming a predetermined state.
Dependencies are inferred from the claim text.