US3699233A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tremolo arrangement for an electronic musical instrument employing feedback of modulated signal to modulator input
Assignee: Nippon Gakki Co Ltd
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Filing: 1971-01-06
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Granted: 1972-10-17
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Expires: 1991-01-06
Abstract
Abstract A carrier wave having a sub-audible frequency is modulated in amplitude by a modulating wave of a tone signal having an audible frequency, thereby producing a resultant modulated output signal including side band components deviated from the original tone signal frequency by a deviation amount equal to the carrier frequency. The frequency of the carrier wave is selected to be much lower than that of the modulating wave. The frequencydeviated signal thus obtained is fed back and admixed with the modulating wave to obtain a multiplicity of frequency-deviated signals. These signals are mixed with the original tone signal to produce an intricate tremolo effect.
Inventors
- 👤 Syoichi Suzuki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 15:36
CPC Classifications
G; G10; G10H; G10H1/00; G10H1/02; G10H1/04; G10H1/043; Y; Y10; Y10S; Y10S84/00; Y10S84/10
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
187 words
In an electronic musical instrument, a tremolo effect producing circuit comprising in combination: a musical sound signal generating circuit; a low frequency oscillator generating a low frequency signal of frequency substantially less than audio frequency range; an amplitude modulator having an input connected to said oscillator for receiving said low frequency signal as a carrier wave, and with a second input connected to said musical sound signal generating circuit for receiving said musical sound signal as a modulating wave, said modulator giving out a modulated output signal including side band signals and the carrier wave; a high-pass filter connected to an output side of said amplitude modulator for receiving said modulated output signal to eliminate said carrier wave and pass side band signals; a feedback amplifier connected between the output of said highpass filter and said amplitude modulator for feeding back said side band signals as modulating waves; and mixer means connected to said musical sound signal generating circuit and said highpass filter thereby to mix said musical sound signal and an output from the high-pass filter to produce a resultant output wave containing a tremolo effect.
Claim 2
Dependent Claim
187 words
In an electronic musical instrument, a tremolo effect producing circuit comprising in combination: a musical sound signal generating circuit; a low frequency oscillator generating a low frequency signal of frequency substantially less than audio frequency range; an amplitude modulator having an input connected to said oscillator for receiving said low frequency signal as a carrier wave, and with a second input connected to said musical sound signal generating circuit for receiving said musical sound signal as a modulating wave, said modulator giving out a modulated output signal including side band signals and the carrier wave; a high-pass filter connected to an output side of said amplitude modulator for receiving said modulated output signal to eliminate said carrier wave and pass side band signals; a feedback amplifier connected between the output of said highpass filter and said amplitude modulator for feeding back said side band signals as modulating waves; and mixer means connected to said musical sound signal generating circuit and said highpass filter thereby to mix said musical sound signal and an output from the high-pass filter to produce a resultant output wave containing a tremolo effect.
Claim 3
Dependent Claim
26 words
A tremolo effect producing circuit as claimed in claim 1, which further comprises a second high-pass filter connected between said feedback amplifier and said amplitude modulator.
Claim 4
Dependent Claim
21 words
A tremolo effect producing circuit as claimed in claim 1, wherein said amplitude modulator is a single side band modulation circuit.
Claim 5
Dependent Claim
16 words
A tremolo effect producing circuit as claimed in claim 1 wherein said mixer means comprises resistors.
References Cited (Backward Citations)
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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) | 1975-10-17 | 1976-04-17 | 1976-10-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-17 | 1980-04-17 | 1980-10-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-17 | 1984-04-17 | 1984-10-17 | $7700.00 | Window Closed / Lapsed |