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Patent US3652953A successfully refreshed from Google Patents.
US3652953A
Expired / Lapsed
US
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Audio oscillator for generating either c.w. damped wave trains or narrow band noise
Assignee: Individual
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Filing: 1970-02-27
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Granted: 1972-03-28
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Expires: 1990-02-27
Abstract
Abstract A signal generator is provided for generating audible C.W., damped wave trains, narrow band noise pulses. It includes an RC coupled oscillatory circuit, the frequency of which may be controlled in the audio frequency range and the gain of which may be controlled to cause it either to oscillate or bring it close to the oscillation point. Signal injector and removing means is connected to the oscillator circuit input and output, these portions being so connected and proportioned and the phase being such that the injected exciting signal is cancelled from the output signal. The signal generated within the oscillatory circuit is a composite of the injected signal and the signal generated by the oscillatory circuit. The injected signal may be a sawtooth shaped wave which will then cause a damped wave train to appear in the output. It can also be a white noise signal which results in a narrow band noise signal occurring in the output. The band width of the noise signal in the output is determined by the Q of the oscillatory circuit. The Q of the circuit can be measured by generating damped wave signals and measuring the decrement of the signal produced, and therefore the value of the band width of the noise signals passed by the circuit can be determined.
Inventors
- 👤 John A Victoreen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 03:33
CPC Classifications
H; H03; H03B; H03B5/00; H03B5/20; H03B5/26
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
78 words
The method of generating audio frequency signals from an oscillatory circuit which comprises adjusting the circuit to just below the point of continuous oscillation, injecting a signal into the oscillatory circuit to cause it to generate a temporary oscillation signal, the character of which is controlled by the infected signal, amplifying the superimposed injected and oscillation signals causing said injected signal and the amplified injected signal to cancel each other in the output and removing the oscillation signal.
Claim 2
Independent Claim
78 words
The method of generating audio frequency signals from an oscillatory circuit which comprises adjusting the circuit to just below the point of continuous oscillation, injecting a signal into the oscillatory circuit to cause it to generate a temporary oscillation signal, the character of which is controlled by the infected signal, amplifying the superimposed injected and oscillation signals causing said injected signal and the amplified injected signal to cancel each other in the output and removing the oscillation signal.
Claim 3
Dependent Claim
25 words
The method as described in claim 1, wherein the injected signal is a sawtooth wave and the removed oscillation signal is a damped wave train.
Claim 4
Dependent Claim
37 words
The method as described in claim 1, wherein the injected signal is white noise and the removed oscillation signal is narrow band noise determined by the Q characteristics of the frequency determining portion of the oscillatory circuit.
Claim 5
Dependent Claim
18 words
The method as described in claim 3, wherein the white noise signal is a pulsed white noise signal.
Claim 6
Independent Claim
88 words
The method of determining the spectral distribution of components contained within a generated narrow band noise signal which comprises measuring the decrement of a generated damped wave train signal produced by a filter used as a wave train generator, using the generator as a filter for passing parts of a white noise signal and relating the decrement, sigma of the filter when generaTing damped wave trains to pass band properties defined by, Q, through the relation sigma log pi /Q when the filter is passing the noise signal.
Claim 7
Independent Claim
88 words
The method of determining the spectral distribution of components contained within a generated narrow band noise signal which comprises measuring the decrement of a generated damped wave train signal produced by a filter used as a wave train generator, using the generator as a filter for passing parts of a white noise signal and relating the decrement, sigma of the filter when generaTing damped wave trains to pass band properties defined by, Q, through the relation sigma log pi /Q when the filter is passing the noise signal.
Claim 8
Independent Claim
91 words
An apparatus for generating audio frequency signals comprising an oscillatory circuit including an amplifier with means to adjust the frequency and gain and having an input and an output, means for injecting a signal into the input of said circuit to cause it to oscillate under control of the injected signal to provide a composite signal composed of the injected signal and the signal generated by the oscillatory circuit, means for extracting a signal from the circuit output comprising a means for cancelling the injected signal and extracting the generated signal.
Claim 9
Independent Claim
91 words
An apparatus for generating audio frequency signals comprising an oscillatory circuit including an amplifier with means to adjust the frequency and gain and having an input and an output, means for injecting a signal into the input of said circuit to cause it to oscillate under control of the injected signal to provide a composite signal composed of the injected signal and the signal generated by the oscillatory circuit, means for extracting a signal from the circuit output comprising a means for cancelling the injected signal and extracting the generated signal.
Claim 10
Dependent Claim
36 words
An apparatus as described in claim 6, wherein said oscillatory circuit is a resistance-capacitance oscillator and means is provided to enable the gain to be adjusted to close to and below the point of continuous oscillation.
Claim 11
Dependent Claim
168 words
An apparatus as described in claim 6, wherein the means for extracting and injecting the signal comprises voltage divider means disposed across the input and output of the oscillatory circuit, said voltage divider means comprising a first portion having an emitter follower means connected thereto, a second voltage divider portion connected to the first portion and the emitter follower and said first portion conducting said composite signal toward the emitter follower and said second portion conducting signals from the source of an injected signal toward the emitter follower, a third voltage divider portion connected to the end of the second voltage divider portion and having the other end connected to the amplifier, the part of the signal derived from the input in said second portion being out-of-phase with the part that was amplified and is present in the first portion and a second emitter follower means connected to the junction of the second and third voltage divider portions for injecting the signal to the input of the generator.
Claim 12
Dependent Claim
165 words
An apparatus as described in claim 7, where a source of an input signal is provided and develops an input signal for injection into the oscillator, said signal extracting means includes an emitter follower in the output of the oscillator and voltage divider resistance means disposed across the output of the emitter follower and comprising a voltage divider portion for developing an output thereacross and a portion of said voltage divider being connected to the oscillator for transmitting an input signal to the oscillator to control the oscillator, and a portion of said voltage divider connected to said emitter follower to develop a signal from the input which is out-of-phase with the portion of the signal from the output of the oscillator circuit that is of the same character as the input signal, the ratio of the resistance of the part transmitting the composite signal and the part where the out-of-phase signal is developed being such that the input signal is cancelled from the output.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-03-28 | 1975-09-27 | 1976-03-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-03-28 | 1979-09-27 | 1980-03-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-03-28 | 1983-09-27 | 1984-03-28 | $7700.00 | Window Closed / Lapsed |