Patent US3796959A successfully refreshed from Google Patents.
US3796959A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Receiver-discriminator circuit
Assignee: Westinghouse Electric Corp
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Filing: 1972-07-14
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Granted: 1974-03-12
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Expires: 1992-07-14
Abstract
Abstract This invention pertains to circuitry for responding to a transmitter RF signal having impressed thereon an AC pulse signal wherein a radio receiver circuit acts to remove the RF carrier signal and supply the AC pulse signal to a discriminator circuit. The discriminator circuit is designed to respond to a fixed predetermined frequency and if the frequency of the AC pulse signal corresponds to said fixed predetermined frequency, the signal is amplified and applied to a pulse width detecting circuit. The pulse width detecting circuit further analyzes the AC pulse signal to determine if the pulse width of the signal falls within predetermined maximum and minimum limits. The recognition of an AC pulse signal exhibiting the predetermined frequency and pulse width characteristics results in the generation of an output signal.
Inventors
- 👤 Kenzie R Mac
- 👤 P Johnston
- 👤 J Reeves
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 19:08
CPC Classifications
G; G08; G08B; G08B25/00; G08B25/01; G08B25/10; G08B13/00; G08B13/02; G08B13/08; E; E05; E05D; E05D11/00; E05D11/0081
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
283 words
In an apparatus for producing an output signal in response to AC input signals of predetermined frequency and predetermined duration, the combination of, first means adapted to respond to an AC input signal by detecting and amplifying a predetermined frequency contained within said AC input signal and demodulating said amplified predetermined frequency to produce a DC output pulse having a pulse width corresponding to the duration of said AC input signal, and second means operatively connected to said first means for establishing predetermined maximum and minimum pulse width limits and generating an output signal when the pulse width of said DC output pulse from said first means falls within said pulse width limits, said second means including a multivibrator circuit having an input and an output, the DC output pulses from said first means being applied to the input of said multivibrator circuit to serve as a trigger pulse, an output circuit operatively connected to the output of said multivibrator circuit for producing an output signal in response to an output from said multivibrator circuit, first pulse width analyzer means operatively connected between the output of said multivibrator circuit and said output circuit for establishing a minimum level output from said multivibrator required for activating said output circuit such that a predetermined pulse width corresponding to a value less than said minimum value is insufficient to activate said output circuit, second pulse width analyzer means operatively connected to the input of said multivibrator circuit to respond to output pulses from said first means having a pulse width exceeding said maximum limit by resetting said multivibrator circuit prior to the development of an output from said multivibrator circuit sufficient to activate said output circuit.
Claim 2
Dependent Claim
283 words
In an apparatus for producing an output signal in response to AC input signals of predetermined frequency and predetermined duration, the combination of, first means adapted to respond to an AC input signal by detecting and amplifying a predetermined frequency contained within said AC input signal and demodulating said amplified predetermined frequency to produce a DC output pulse having a pulse width corresponding to the duration of said AC input signal, and second means operatively connected to said first means for establishing predetermined maximum and minimum pulse width limits and generating an output signal when the pulse width of said DC output pulse from said first means falls within said pulse width limits, said second means including a multivibrator circuit having an input and an output, the DC output pulses from said first means being applied to the input of said multivibrator circuit to serve as a trigger pulse, an output circuit operatively connected to the output of said multivibrator circuit for producing an output signal in response to an output from said multivibrator circuit, first pulse width analyzer means operatively connected between the output of said multivibrator circuit and said output circuit for establishing a minimum level output from said multivibrator required for activating said output circuit such that a predetermined pulse width corresponding to a value less than said minimum value is insufficient to activate said output circuit, second pulse width analyzer means operatively connected to the input of said multivibrator circuit to respond to output pulses from said first means having a pulse width exceeding said maximum limit by resetting said multivibrator circuit prior to the development of an output from said multivibrator circuit sufficient to activate said output circuit.
Claim 3
Dependent Claim
64 words
In an apparatus as claimed in claim 1 wherein said first pulse width analyzing means includes an integrator circuit for integrating over a period of time the output signal from sAid multivibrator circuit, and said second pulse width analyzing means includes an integrator circuit for integrating the DC pulses supplied to the input of said multivibrator circuit as trigger pulses with respect to time.
Claim 4
Dependent Claim
24 words
In an apparatus as claimed in claim 2 wherein said integrating means associated with said first and second pulse width analyzing means are capacitors.
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) | 1977-03-11 | 1977-09-10 | 1978-03-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-11 | 1981-09-10 | 1982-03-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-11 | 1985-09-10 | 1986-03-12 | $7700.00 | Window Closed / Lapsed |