US3845402A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sonobuoy receiver system, floating coupler
Assignee: Edmac Associates Inc
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Filing: 1973-02-15
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Granted: 1974-10-29
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Expires: 1993-02-15
Abstract
Abstract A modulation-demodulation floating coupler for use in a Sonobuoy Receiver to perform the function of an isolation transformer operating over a wide frequency band with very little phase shift is disclosed. The coupler is responsive to a high frequency composite input signal having a carrier portion on which is modulated a baseband information portion which is to be coupled and includes a transformer for coupling the composite signal to a pair of demodulators, the first of which provides an output with no ground reference, and the second demodulator produces a local feedback signal for gain and distortion control.
Inventors
- 👤 R Nupp
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 12:27
CPC Classifications
H; H03; H03F; H03F3/00; H03F3/38; G; G01; G01S; G01S1/00; G01S1/72; G01S1/74; G01S1/75; G01S1/753; G01S2201/00; G01S2201/01; G01S2201/07
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
154 words
A floating coupler for a sonobuoy receiver system which in response to an input A. C. baseband ground reference signal and a carrier signal produces an output baseband signal decoupled from ground reference, comprising: a. an A.M. pinch modulator responsive to the input signal and the carrier signal for amplitude modulating the carrier signal with the input signal; b. transformer electrically coupled to said modulator; c. first and second substantially identical demodulators coupled to said transformer and responsive to the modulated carrier signal so that said first demodulator produces the output signal and said second demodulator produces a feedback ground referenced baseband signal; and d. feedback means including a summing network responsive to the feedback ground reference signal produced by said second demodulator and thE input signal for effecting a change in the input signal before it is received by said modulator for reducing effects of non-linearities and gain changes in the floating coupler.
Claim 2
Dependent Claim
154 words
A floating coupler for a sonobuoy receiver system which in response to an input A. C. baseband ground reference signal and a carrier signal produces an output baseband signal decoupled from ground reference, comprising: a. an A.M. pinch modulator responsive to the input signal and the carrier signal for amplitude modulating the carrier signal with the input signal; b. transformer electrically coupled to said modulator; c. first and second substantially identical demodulators coupled to said transformer and responsive to the modulated carrier signal so that said first demodulator produces the output signal and said second demodulator produces a feedback ground referenced baseband signal; and d. feedback means including a summing network responsive to the feedback ground reference signal produced by said second demodulator and thE input signal for effecting a change in the input signal before it is received by said modulator for reducing effects of non-linearities and gain changes in the floating coupler.
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) | 1977-10-28 | 1978-04-29 | 1978-10-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-28 | 1982-04-29 | 1982-10-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-28 | 1986-04-29 | 1986-10-29 | $7700.00 | Window Closed / Lapsed |