US3843932A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Wide band frequency modulation detector
Assignee: GTE Sylvania Inc
•
Filing: 1973-11-14
•
Granted: 1974-10-22
•
Expires: 1993-11-14
Abstract
Abstract A wide band frequency modulation detector utilizing a surface wave delay device is shown. The surface wave delay device delays the received frequency modulated signal by a predetermined amount. The delayed signal and the undelayed frequency modulated signal are applied to a product detector which reproduces the modulating signal.
Inventors
- 👤 M Fischman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:04
CPC Classifications
H; H03; H03D; H03D3/00; H03D3/02; H03D3/06; H03D3/16
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
123 words
A frequency modulation detector comprising: means for providing a frequency modulated signal; a surface wave device having a piezoelectric substrate, an input transducer disposed on said substrate and coupled to said means for providing a frequency modulated signal, and at least one output transducer disposed on said substrate and spaced from said input transducer by a distance corresponding to a predetermined time delay; a product detector connected to said output transducer for receiving a delayed signal representative of said frequency modulated signal; and means connected between said means for providing a frequency modulated signal and said product detector for coupling a signal representative of said frequency modulated signal to said product detector, said product detector detecting the frequency modulations of said delayed signal.
Claim 2
Dependent Claim
123 words
A frequency modulation detector comprising: means for providing a frequency modulated signal; a surface wave device having a piezoelectric substrate, an input transducer disposed on said substrate and coupled to said means for providing a frequency modulated signal, and at least one output transducer disposed on said substrate and spaced from said input transducer by a distance corresponding to a predetermined time delay; a product detector connected to said output transducer for receiving a delayed signal representative of said frequency modulated signal; and means connected between said means for providing a frequency modulated signal and said product detector for coupling a signal representative of said frequency modulated signal to said product detector, said product detector detecting the frequency modulations of said delayed signal.
Claim 3
Dependent Claim
61 words
A frequency modulation detector as defined in claim 1 wherein said means for coupling a signal representative of said frequency modulateD signal to said product detector includes means for forming at least one sampling pulse during each cycle of said frequency modulated signal, and said product detector includes switching means for sampling said delayed signal during each of the sampling pulses.
Claim 4
Dependent Claim
58 words
A frequency modulation detector as defined in claim 1 wherein said surface wave device includes first and second output transducers disposed on said substrate on opposite sides of said input transducer and spaced from said input transducer by distances corresponding to predetermined time delay, said first and second output transducers being connected in parallel to said product detector.
Claim 5
Dependent Claim
36 words
A frequency modulation detector as defined in claim 1 wherein the magnitude of said time delay corresponds to a number of wavelengths such that said delayed signal is in quadrature phase with said frequency modulated signal.
Claim 6
Dependent Claim
114 words
A frequency modulation detector comprising: means for providing a frequency modulated signal; a surface wave device having a piezoelectric substrate, an input transducer disposed on said substrate and coupled to said means for providing a frequency modulated signal, and at least one output transducer disposed on said substrate and spaced from said input transducer by a distance corresponding to a predetermined time delay; means connected to said means for providing a frequency modulated signal for forming sampling pulses representative of said frequency modulated signal; and a product detector connected to said output transducer for receiving a delayed signal representative of said frequency modulated signal and further connected to said means for forming sampling pulses.
Claim 7
Dependent Claim
114 words
A frequency modulation detector comprising: means for providing a frequency modulated signal; a surface wave device having a piezoelectric substrate, an input transducer disposed on said substrate and coupled to said means for providing a frequency modulated signal, and at least one output transducer disposed on said substrate and spaced from said input transducer by a distance corresponding to a predetermined time delay; means connected to said means for providing a frequency modulated signal for forming sampling pulses representative of said frequency modulated signal; and a product detector connected to said output transducer for receiving a delayed signal representative of said frequency modulated signal and further connected to said means for forming sampling pulses.
Claim 8
Dependent Claim
27 words
A frequency modulation detector as defined in claim 5 wherein said product detector includes switching means for sampling said delayed signal in response to said sampling pulses.
Claim 9
Dependent Claim
30 words
A frequency modulation detector as defined in claim 6 wherein said means for forming sampling pulses forms at least one sampling pulse during each cycle of said frequency modulated signal.
Claim 10
Dependent Claim
33 words
A frequency modulation detector as defined in claim 5 wherein said time delay corresponds to a number of wavelengths such that said delayed signal is in quadrature phase with said frequency modulated signal.
Claim 11
Dependent Claim
64 words
A frequency modulation detector as defined in claim 5 wherein said surface wave device includes a second output transducer disposed on said substrate on the side of said input transducer opposite said first-named output transducer and spaced from said input transducer by a distance corresponding to said predetermined time delay, said first and second output transducers being connected in parallel to said product detector.
References Cited (Backward Citations)
US3582838A
Cited
US3582840A
Cited
US3678364A
Cited
US3714594A
Cited
US3626309A
Cited
US3750027A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-10-21 | 1978-04-22 | 1978-10-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-21 | 1982-04-22 | 1982-10-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-21 | 1986-04-22 | 1986-10-22 | $7700.00 | Window Closed / Lapsed |