US3562400A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Percussion keyer with pedal sustain for electronic musical instrument
Assignee: G C ELECTRONICS Inc
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Filing: 1968-02-20
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Granted: 1971-02-09
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Expires: 1988-02-20
Abstract
Abstract A percussive musical note is simulated. A switch passes a pulse to an RC circuit which differentiates the leading edge. The formed signal simulates a percussive instrument. A second switch adds a sustained voltage to the pulse. A diode blocks part of the discharge path of the RC circuit and extends its decay time. Hence the note may be short or sustained.
Inventors
- 👤 Royce L Cutler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 01:51
CPC Classifications
G; G10; G10H; G10H1/00; G10H1/02; G10H1/04; G10H1/053; G10H1/057
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
225 words
A transistorized circuit for use in an electronic musical instrument to simulate a percussive keyboard effect when supplied with a signal representative of a musical note comprising: a. A transistor having base, collector and emitter; b. A switch suitably adapted to be used as a key of a keyboard; c. A voltage source connected to said switch; d. Diode means connected to the other side of said switch and having an anode and cathode arranged to pass a voltage surge of one polarity; e. RC differentiating circuit means connected to receive a voltage level on closure of said switch for forming an output signal which builds toward a peak and decays toward a lesser value in an exponential fashion; f. Said base of said transistor means being connected to receive the output signal from said RC circuit means in a manner to control operation of said transistor; g. Said transistor being connected to amplify a signal representative of a musical note with the gain of said transistor being imposed on the signal representative of the musical note; h. An additional switch connected with a voltage source to provide a voltage level when closed; and i. Said additional switch being connected to said base to provide sustained conduction of said transistor in the manner of a sustained percussive musical note after said first switch is operated.
Claim 2
Dependent Claim
225 words
A transistorized circuit for use in an electronic musical instrument to simulate a percussive keyboard effect when supplied with a signal representative of a musical note comprising: a. A transistor having base, collector and emitter; b. A switch suitably adapted to be used as a key of a keyboard; c. A voltage source connected to said switch; d. Diode means connected to the other side of said switch and having an anode and cathode arranged to pass a voltage surge of one polarity; e. RC differentiating circuit means connected to receive a voltage level on closure of said switch for forming an output signal which builds toward a peak and decays toward a lesser value in an exponential fashion; f. Said base of said transistor means being connected to receive the output signal from said RC circuit means in a manner to control operation of said transistor; g. Said transistor being connected to amplify a signal representative of a musical note with the gain of said transistor being imposed on the signal representative of the musical note; h. An additional switch connected with a voltage source to provide a voltage level when closed; and i. Said additional switch being connected to said base to provide sustained conduction of said transistor in the manner of a sustained percussive musical note after said first switch is operated.
Claim 3
Dependent Claim
43 words
The invention of claim 1 wherein said musical note signal is input to the base of said transistor and said RC circuit means is connected thereto to bias operation of said transistor in a manner such that gain of said transistor is varied.
Claim 4
Dependent Claim
37 words
The invention of claim 1 wherein said additional switch is connected by a series resistor to said series capacitor and provides a voltage level tending to sustain its voltage level after closing and opening of said switch.
Claim 5
Dependent Claim
73 words
The invention of claim 1 wherein the time rate of operation of said RC circuit means is determined at least partially by a first resistive discharge path and a second resistive discharge path and wherein said additional switch means is connected to a diode to bias one of said resistive discharge paths to a blocked condition to reduce the rate of discharge and therefore extend the discharge time of said RC circuit means.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-02-08 | 1974-08-10 | 1975-02-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-08 | 1978-08-10 | 1979-02-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-08 | 1982-08-10 | 1983-02-09 | $7700.00 | Window Closed / Lapsed |