Electronic musical instrument with a percussion sound producing device

Claim 2

An electronic musical instrument comprising: means for generating musical tone signals, an expression pedal device for controlling the tone volume of said musical tone signals, detecting means associated with said expression pedal device for detecting the operation thereof and for generating an electric signal when said expression pedal device is operated, a driving pulse generator for generating a driving pulse upon receipt of said electric signal from said detecting means, and a percussion sound generator for generating percussion sound signals in response to said driving pulse.

Claim 3

An electronic musical instrument according to claim 1 the percussion sound generator consists of a white noise signal generator for producing white noise signals, a tone coloring filter for forming percussion sound signals having desired tone colors from the white noise signals generated by said white noise signal generator and a switching circuit for drawing out the percussion sound signals passing through the tone coloring filter.

Claim 4

An electronic musical instrument according to claim 1 wherein said detecting means comprises a pressure-sensitive switching element.

Claim 5

An electronic musical instrument according to claim 1 wherein said detecting means comprises an electromagnetically coupled system.

Claim 6

An electronic musical instrument according to claim 1 wherein said pulse generator includes a monostable multivibrator.

Claim 7

An electronic musical instrument comprising; means for generating musical tone signals; an expression pedal device for controlling the tone volume of said musical tone signals; detecting means associated with said expression pedal device for detecting the operation thereof and for generating an electric signal when said expression pedal device is operated; a driving pulse generator for generating a driving pulse upon receipt of said electric signal from said detecting means; and a percussion sound generator for generating percussion sound signals in response to said driving pulse, wherein said percussion sound generator includes a switching circuit consisting of a circuit associated with an emitter-grounded type transistor whose base is supplied with said percussion sound signals, and in said circuit there are connected at least two serially arranged resistors across the emitter terminal of said transistor and a suitable DC potential point lying between the operating source potential points, the contact of said two serially arranged resistors being used as a keying terminal for switching, and there is connected a condenser between the keying terminal and grounding point.

Claim 8

An electronic musical instrument comprising; means for generating musical tone signals; an expression pedal device for controlling the tone volume of said musical tone signals; detecting means associated with said expression pedal device for detecting the operation thereof and for generating an electric signal when said expression pedal device is operated; a driving pulse generator for generating a driving pulse upon receipt of said electric signal from said detecting means; and a percussion sound generator for generating percussion sound signals in response to said driving pulse, wherein said percussion sound generator includes a switching circuit consisting of a circuit associated with an emitter-grounded type transistor whose base is supplied with said percussion sound signals, and in said circuit there are connected at least two serially arranged resistors across the emitter terminal of said transistor and a suitable DC potential point lying between the operating source potential points, the contact of said two serially arranged resistors being used as a keying terminal for switching, and there is connected a condenser between the keying terminal and grounding point.

Claim 9

In an electronic musical instrument having a pedal controlled signal output element and having a white noise generating transistor electrically connected to a tone coloring filter, a switching device for operatively connecting the pedal controlled signal output element to the white noise generating transistor comprising an emitter grounded transistor, a direct current source, a pair of serially connected resistors connected across the emitter terminal of said transistor and a direct current potential point lying between operating source potential points, a keying terminal between said pair of resistors for switching, and a condenser connected between and to the keying terminal and grounding point of said transmitter.

Claim 10

In an electronic musical instrument having a pedal controlled signal output element and having a white noise generating transistor electrically connected to a tone coloring filter, a switching device for operatively connecting the pedal controlled signal output element to the white noise generating transistor comprising an emitter grounded transistor, a direct current source, a pair of serially connected resistors connected across the emitter terminal of said transistor and a direct current potential point lying between operating source potential points, a keying terminal between said pair of resistors for switching, and a condenser connected between and to the keying terminal and grounding point of said transmitter.

Claim 11

In an electronic musical instrument; a white noise generating transistor connected to a source of direct current and normally biased to a conductive state; a switching transistor having a grounded emitter electrically connected in circuit to said white noise generating transistor and to the source of direct current; said switching transistor being biased to a nonconductive state; a tone-coloring filter connected to and between said white noise generating traNsistor and said switching transistor to effect a desired percussion sound; means operable to apply pulses to the bias of said switching transistor to render this latter conductive; and a pedal-actuated switch operatively connected to and controlling said means.

Claim 12

In an electronic musical instrument; a white noise generating transistor connected to a source of direct current and normally biased to a conductive state; a switching transistor having a grounded emitter electrically connected in circuit to said white noise generating transistor and to the source of direct current; said switching transistor being biased to a nonconductive state; a tone-coloring filter connected to and between said white noise generating traNsistor and said switching transistor to effect a desired percussion sound; means operable to apply pulses to the bias of said switching transistor to render this latter conductive; and a pedal-actuated switch operatively connected to and controlling said means.