US3609204A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vibrato system for electrical musical instrument
Assignee: Individual
•
Filing: 1969-10-06
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Granted: 1971-09-28
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Expires: 1989-10-06
Abstract
Abstract The invention relates to systems for imposing vibrato effects on electrical signals, as from the output of an electronic organ, electric guitar or other electrical musical instrument. A series of resistance-capacitance (RC) phase-shifting networks are connected in cascade, each of which, when enabled, is capable of producing a predetermined phase shift at any given frequency. The phase shift produced by all of the individual networks is cumulative. The individual phase-shifting networks are sequentially enabled seriatim, and then disabled seriatim, to produce a close approximation to true frequency modulation.
Inventors
- 👤 Richard H Peterson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 01:42
CPC Classifications
G; G10; G10H; G10H1/00; G10H1/02; G10H1/04; G10H1/043
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
133 words
A phase shift vibrato system for electrical musical instruments comprising: a pair of input terminals and a pair of output terminals; a series of individual RC phase-shifting networks connected in cascade between said input and output terminals, each network capable of producing a predetermined phase shift at any given audio frequency; all of said individual phase-shifting networks acting in the same sense to produce a cumulative phase shift on signals appearing at the output terminals as compared with signals applied to said input terminals; a plurality of first means associated respectively with said plurality of individual phase-shifting networks for changing the phase shift produced by said networks; and second means for enabling said plurality of first means seriatim and then disabling said first means seriatim; said second means operating at a vibrato rate.
Claim 2
Dependent Claim
133 words
A phase shift vibrato system for electrical musical instruments comprising: a pair of input terminals and a pair of output terminals; a series of individual RC phase-shifting networks connected in cascade between said input and output terminals, each network capable of producing a predetermined phase shift at any given audio frequency; all of said individual phase-shifting networks acting in the same sense to produce a cumulative phase shift on signals appearing at the output terminals as compared with signals applied to said input terminals; a plurality of first means associated respectively with said plurality of individual phase-shifting networks for changing the phase shift produced by said networks; and second means for enabling said plurality of first means seriatim and then disabling said first means seriatim; said second means operating at a vibrato rate.
Claim 3
Dependent Claim
121 words
A vibrato device for use with an electrical musical instrument comprising: a pair of input terminals and a pair of output terminals; a plurality of RC phase-shifting networks connected in cascade between said input and output terminals, each capable of producing a predetermined phase shift at any given audio frequency, and acting in the same sense to produce a cumulative phase shift in signals appearing at the output terminals as compared to signals applied to said input terminals; means for sequentially modifying at a vibrato repetition rate, the phase-shifting characteristics of said plurality of phase-shifting networks such that each has its phase-shifting characteristic modified for a fraction of each vibrato cycle, said function being different for each of said phase-shifting networks.
Claim 4
Dependent Claim
121 words
A vibrato device for use with an electrical musical instrument comprising: a pair of input terminals and a pair of output terminals; a plurality of RC phase-shifting networks connected in cascade between said input and output terminals, each capable of producing a predetermined phase shift at any given audio frequency, and acting in the same sense to produce a cumulative phase shift in signals appearing at the output terminals as compared to signals applied to said input terminals; means for sequentially modifying at a vibrato repetition rate, the phase-shifting characteristics of said plurality of phase-shifting networks such that each has its phase-shifting characteristic modified for a fraction of each vibrato cycle, said function being different for each of said phase-shifting networks.
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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) | 1974-09-27 | 1975-03-29 | 1975-09-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-27 | 1979-03-29 | 1979-09-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-27 | 1983-03-29 | 1983-09-28 | $7700.00 | Window Closed / Lapsed |