US3609201A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Variable pitch narrow band noise generator
Assignee: Nippon Gakki Co Ltd
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Filing: 1970-08-19
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Granted: 1971-09-28
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Expires: 1990-08-19
Abstract
Abstract A variable pitch narrow band noise generator comprising a noise signal source for generating a noise signal containing broad band frequency components; an amplifier for amplifying the noise signal from the source; a filter consisting of a plurality of frequency-selecting circuits supplied in common with the amplified noise signal from the amplifier, selecting different band-pass frequency components and connected in parallel in the order of the center frequency of frequency ranges of the bandpass frequency components; a normally open type variable resistor assembly consisting of an elongated resistor element and a similarly elongated flexible conductive contact element disposed adjacent to each other; a signal-circulating circuit for feeding a noise signal derived from the filter with depression of the flexible conductive contact element of the variable resistor assembly back to the amplifier so as to produce the noise signal in a narrower band form; and an output amplifier for amplifying the resultant narrow band pitch noise signal obtained from the signal-circulating circuit, whereby there can be easily obtained particularly from the output amplifier a noise signal having such a pitch sensation as is observed in a husky voice and containing a certain narrow band frequency components, the signals being capable of varying in pitch continuously as desired.
Inventors
- 👤 Takeshi Adachi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 08:52
CPC Classifications
G; G10; G10H; G10H1/00; G10H1/02; G10H1/04; G10H1/053; G10H1/055; G10H1/0558; Y; Y10; Y10S; Y10S84/00; Y10S84/20
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
140 words
A variable pitch narrow band noise generator comprising a noise signal source for generating broad band noise signal components; an amplifier for amplifying noise signals from the noise source; a filter including a plurality of frequencyselecting circuits supplied in common with amplified noise signals from the amplifier and selecting different band-pass frequency components; a variable resistor assembly including an elongated resistor element and a similarly elongated flexible conductive contact element which closely face each other so as to selectively determine the band-pass frequency components of noise signals derived from the filter upon depression of the contact element; a signal-circulating circuit for feeding signals obtained by operation of the variable resistor assembly back to the amplifier so as to form more pitch sensation signals; and an output amplifier for deriving resultant narrow band pitched noise signals obtained through the signal-circulating circuit.
Claim 2
Dependent Claim
140 words
A variable pitch narrow band noise generator comprising a noise signal source for generating broad band noise signal components; an amplifier for amplifying noise signals from the noise source; a filter including a plurality of frequencyselecting circuits supplied in common with amplified noise signals from the amplifier and selecting different band-pass frequency components; a variable resistor assembly including an elongated resistor element and a similarly elongated flexible conductive contact element which closely face each other so as to selectively determine the band-pass frequency components of noise signals derived from the filter upon depression of the contact element; a signal-circulating circuit for feeding signals obtained by operation of the variable resistor assembly back to the amplifier so as to form more pitch sensation signals; and an output amplifier for deriving resultant narrow band pitched noise signals obtained through the signal-circulating circuit.
Claim 3
Dependent Claim
18 words
The noise generator according to claim 1 wherein the noise signal source includes a white noise signal source.
Claim 4
Dependent Claim
20 words
The noise generator according to claim 1 wherein the frequency-selecting circuits constituting the filter are comprised of Wien bridge circuits.
Claim 5
Dependent Claim
135 words
The noise generator according to claim 1 wherein the variable resistor assembly comprises an elongated resistor element fitted substantially along the central line on the longitudinal upper surface of a substantially rectangular insulation member, a cover for closing up the upper surface of the insulation member in a manner closely to face the resistor element, the flexible conductive contact element being fixed to that part of the underside of the cover which faces the resistor element, whereby depression of that part of the upper surface of the cover which faces the contact element causes the part of the contact element at which it is depressed conductively to contact the corresponding part of the resistor element, thereby selectively determining the value of resistance of the resistor assembly in accordance with the position of the contact point.
Claim 6
Dependent Claim
36 words
The noise generator according to claim 1 wherein the signal-circulating circuit has its amplification gain set at less than 1, the output amplifier thereby providing narrow band pitched noise signals having a relatively low pitch sensation.
Claim 7
Dependent Claim
41 words
The noise generator according to claim 1 wherein the signal-circulating circuit has its amplification gain set at more than 1 to constitute a self-oscillation circuit, the output amplifier thereby providing narrow band pitched noise signals having a relatively high pitch sensation.
Claim 8
Dependent Claim
54 words
The noise generator according to claim 1 comprising a gain control circuit coupled between the output amplifier and signal-circulating circuit for negatively feeding a rectified voltage obtained by rectifying an output voltage from the output amplifier back to the signal-circulating circuit, thereby stabilizing the amplification gain therein to a value of less than one.
Claim 9
Dependent Claim
59 words
The noise generator according to claim 7 wherein the gain control circuit includes a rectifier for rectifying an output voltage from the output amplifier and a field-effect transistor whose gate electrode is supplied with the rectified voltage for variable control of the resistance across its source and drain electrodes, and in consequence an amplificatioN gain in the signal-circulating circuit.
Claim 10
Dependent Claim
55 words
The noise generator according to claim 7 wherein the gain control circuit includes a time constant circuit which comprises a capacitor and DC impedance element so as to charge and discharge the rectified voltage, the charging and discharging action of the time constant circuit enabling signals to be drawn out intermittently from the output amplifier.
Claim 11
Dependent Claim
130 words
A variable frequency narrow band filter comprising an input terminal; an amplifier for amplifying signals from the input terminal; a filter including a plurality of frequency-selecting circuits supplied in common with amplified signals from the amplifier and selecting different band-pass frequency components; a variable resistor assembly including an elongated resistor element and a similarly elongated flexible conductive contact element which closely face each other so as to selectively determine the band-pass frequency components of signals derived from the filter upon depression of the contact element; a signal-circulating circuit for feeding signals obtained by operation of the variable resistor assembly back to the amplifier; an output amplifier for deriving filtered components of the signals from the signal-circulating circuit; and an output terminal for taking out the signals from said output amplifier.
Claim 12
Dependent Claim
130 words
A variable frequency narrow band filter comprising an input terminal; an amplifier for amplifying signals from the input terminal; a filter including a plurality of frequency-selecting circuits supplied in common with amplified signals from the amplifier and selecting different band-pass frequency components; a variable resistor assembly including an elongated resistor element and a similarly elongated flexible conductive contact element which closely face each other so as to selectively determine the band-pass frequency components of signals derived from the filter upon depression of the contact element; a signal-circulating circuit for feeding signals obtained by operation of the variable resistor assembly back to the amplifier; an output amplifier for deriving filtered components of the signals from the signal-circulating circuit; and an output terminal for taking out the signals from said output amplifier.
Claim 13
Dependent Claim
47 words
The noise generator according to claim 1 for use in an electronic musical instrument comprising keying means for operating the flexible conductive contact element in the variable resistor assembly for performance substantially in the same manner as a plurality of keys arranged in the order of pitches.
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) | 1974-09-27 | 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 |