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US3617601A
Expired / Lapsed
US
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Electronic musical tone generator employing pitch compensation
Assignee: Individual
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Filing: 1969-05-29
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Granted: 1971-11-02
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Expires: 1989-05-29
Abstract
Abstract A continually operative tone oscillator has a keying network coupled to the output thereof. When the keying network is turned on, a capacitor gradually charges to a reference level. As the capacitor charges, the loading on the oscillator increases to simultaneously increase the frequency and the amplitude of the output tone. When the keying network is turned off, the capacitor discharges producing a gradual decay of the output tone. Simultaneously, the loading on the tone oscillator is decreased, thereby shifting the frequency thereof back to the original unkeyed value.
Inventors
- 👤 Fred G Krueger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 11:48
CPC Classifications
G; G10; G10H; G10H1/00; G10H1/02; G10H1/04; Y; Y10; Y10S; Y10S84/00; Y10S84/23
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
183 words
An electronic musical tone generator employing pitch compensation especially adapted for use in the bass region of the musical tone spectrum including: a voltage-controlled tone generator providing a musical tone signal at a predetermined frequency; an output terminal; a pair of back-to-back diodes being coupled between said voltage-controlled tone generator and said output terminal for blocking said musical tone signal from said output terminal; a reference voltage biasing means being coupled between said back-to-back diodes, said biasing means including a charging RC network for biasing said diodes at a predetermined rate for causing said diodes to conduct and for applying a steadily increasing voltage to said voltage controlled tone generator to increase the frequency thereof; and switch means coupled between said source and the RC network of said biasing means for causing the amplitude of the charge on said RC network to steadily rise when closed to increase the frequency of said tone generator and for causing the amplitude of the charge on said RC network to steadily decrease when said switch means is opened to decrease the frequency of said tone generator.
Claim 2
Dependent Claim
183 words
An electronic musical tone generator employing pitch compensation especially adapted for use in the bass region of the musical tone spectrum including: a voltage-controlled tone generator providing a musical tone signal at a predetermined frequency; an output terminal; a pair of back-to-back diodes being coupled between said voltage-controlled tone generator and said output terminal for blocking said musical tone signal from said output terminal; a reference voltage biasing means being coupled between said back-to-back diodes, said biasing means including a charging RC network for biasing said diodes at a predetermined rate for causing said diodes to conduct and for applying a steadily increasing voltage to said voltage controlled tone generator to increase the frequency thereof; and switch means coupled between said source and the RC network of said biasing means for causing the amplitude of the charge on said RC network to steadily rise when closed to increase the frequency of said tone generator and for causing the amplitude of the charge on said RC network to steadily decrease when said switch means is opened to decrease the frequency of said tone generator.
Claim 3
Dependent Claim
71 words
The electronic musical tone generator as defined in claim 1, wherein said voltage-controlled oscillator includes: a second reference voltage source; a transistor including a collector output being coupled to said output terminal through said diodes and also being coupled to said second source, said transistor including an emitter coupled to a ground reference and a base; and a filter network being coupled between the collector and the base of said transistor.
Claim 4
Dependent Claim
22 words
The electrical musical tone generator as defined in claim 1 wherein said switch means being a key of an electronic musical instrument.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-11-01 | 1975-05-03 | 1975-11-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-01 | 1979-05-03 | 1979-11-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-01 | 1983-05-03 | 1983-11-02 | $7700.00 | Window Closed / Lapsed |