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US3598891A
Expired / Lapsed
US
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Musical tone-forming circuitry including filter and random noise modulation
Assignee: Nippon Gakki Co Ltd
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Filing: 1969-06-23
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Granted: 1971-08-10
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Expires: 1989-06-23
Abstract
Abstract A whistle or grass reed sound is simulated by an electronic musical circuitry comprising a portamento-type oscillator, a tone coloring filter for providing a tone signal having predetermined harmonics as well as a fundamental, a noise generator, a low-pass filter for deriving frequency components below 30 Hz from a noise signal output of the noise generator, and a modulator for amplitude modulating the tone signal from the tone coloring filter with the noise signal components of less than 30 Hz from the low-pass filter.
Inventors
- 👤 Takeshi Adachi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 23:16
CPC Classifications
G; G10; G10H; G10H1/00; G10H1/02; G10H1/04; G10H1/043; Y; Y10; Y10S; Y10S84/00; Y10S84/09
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
96 words
A musical tone forming circuit comprising: a tone generator including portamento-type oscillator means for producing a tone signal having gradually variable frequency: a tone coloring filter coupled to the output of said tone generator for producing a tone signal having a predetermined harmonics and a fundamental frequency: a white noise signal generator; a low-pass filter for deriving frequency components below 30 Hz. out of a noise signal from said white noise signal generator; and an amplitude modulator for amplitude modulating a tone signal from said tone coloring filter with a noise signal from said low-pass filter.
Claim 2
Dependent Claim
96 words
A musical tone forming circuit comprising: a tone generator including portamento-type oscillator means for producing a tone signal having gradually variable frequency: a tone coloring filter coupled to the output of said tone generator for producing a tone signal having a predetermined harmonics and a fundamental frequency: a white noise signal generator; a low-pass filter for deriving frequency components below 30 Hz. out of a noise signal from said white noise signal generator; and an amplitude modulator for amplitude modulating a tone signal from said tone coloring filter with a noise signal from said low-pass filter.
Claim 3
Dependent Claim
33 words
The tone-forming circuit according to claim 1 wherein said white noise signal generator comprises a negatively biased transistor circuit, the breakdown characteristic of said transistor being utilized in generating said white noise signals.
Claim 4
Dependent Claim
62 words
The tone-forming circuit according to claim 1 where said amplitude modulator comprises a balanced modulation circuit including an input transformer for supplying tone signals obtained from said tone coloring filter, an input transformer for supplying the modulating signals obtained from said low-pass filter and an output transformer for taking out output signals obtained by modulating said tone signals with said modulating signals.
Claim 5
Dependent Claim
74 words
The tone-forming circuit according to claim 1 wherein said amplitude modulator comprises a field effect transistor having its gate terminal grounded through a resistor, one of its source and drain terminals being connected to receive said tone signals from said tone coloring filter, said gate terminal being connected to receive the modulating signal from said low-pass filter and the other source or drain terminal being connected to couple the modulated signals to an output.
Claim 6
Dependent Claim
22 words
The tone-forming circuit according to claim 1 wherein the tone signal from said tone coloring filter has a flute voice tone color.
Claim 7
Dependent Claim
22 words
The tone-forming circuit according to claim 1 wherein the tone signal from said tone coloring filter has a reed voice tone color.
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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) | 1974-08-09 | 1975-02-08 | 1975-08-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-09 | 1979-02-08 | 1979-08-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-09 | 1983-02-08 | 1983-08-10 | $7700.00 | Window Closed / Lapsed |