Patent US3729679A successfully refreshed from Google Patents.
US3729679A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Suppressed carrier single-sideband signal detection
Assignee: United States Department of the Navy
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Filing: 1971-08-30
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Granted: 1973-04-24
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Expires: 1991-08-30
Abstract
Abstract A single-sideband signal with an unknown suppressed carrier frequency is simultaneously processed through both an amplitude modulated (AM) receiver and a single-sideband (SSB) receiver. The AM receiver supplies an output signal to trigger the horizontal sweep circuit of an oscilloscope. The output of the SSB receiver is applied to the vertical input of the oscilloscope. The correct tuning of the SSB receiver to the carrier frequency causes a stationary signal to appear on the oscilloscope.
Inventors
- 👤 L Day
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 23:35
CPC Classifications
H; H04; H04B; H04B1/00; H04B1/68
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
118 words
A system for detecting information in a suppressed-carrier single-sideband signal formed by a modulating signal with a fundamental frequency on a carrier signal of unknown frequency, comprising: first means for receiving the single-sideband signal and having an adjustable tuner for providing an output signal which is a replica of the modulating signal; second means connected to said first means for converting said first means output signal to an acoustic signal; third means for receiving and envelope demodulating the singlesideband signal and providing an output signal having the same fundamental frequency as that of the modulating signal; and fourth means connected to receive the outputs of said first and third means for comparing the fundamental frequencies of the outputs.
Claim 2
Independent Claim
118 words
A system for detecting information in a suppressed-carrier single-sideband signal formed by a modulating signal with a fundamental frequency on a carrier signal of unknown frequency, comprising: first means for receiving the single-sideband signal and having an adjustable tuner for providing an output signal which is a replica of the modulating signal; second means connected to said first means for converting said first means output signal to an acoustic signal; third means for receiving and envelope demodulating the singlesideband signal and providing an output signal having the same fundamental frequency as that of the modulating signal; and fourth means connected to receive the outputs of said first and third means for comparing the fundamental frequencies of the outputs.
Claim 3
Dependent Claim
80 words
A detecting system according to claim 1 wherein said fourth means further comprises: an oscilloscope having triggering means connected to said third means and actuated at the fundamental frequency of said third means output signal, a vertical amplitude circuit connected to receive the replica modulating signal, and a cathode ray tube connected to said triggering means and said amplitude circuit for displaying the replica modulating signal in time increments determined by the fundamental frequency of the third means output signal.
Claim 4
Dependent Claim
13 words
A system according to claim 2 wherein sAid second means comprises a headphone.
Claim 5
Dependent Claim
16 words
A detecting system according to claim 3 wherein said third means comprises an amplitude modulated receiver.
Claim 6
Dependent Claim
196 words
A single-sideband communication system comprising: a carrier oscillator for generating a carrier frequency signal; a waveform generator for generating an amplitude modulated signal; a single-sideband generator connected to receive the carrier frequency and amplitude modulated signals for generating a suppressed carrier single-sideband signal; a first antenna connected to said single-sideband generator for transmitting said single-sideband signal; a second antenna adapted to receive said single-sideband signal; a single-sideband receiver having an adjustable tuner connected to said second antenna for producing a replica of the amplitude modulated signals; a transducer connected to said single-sideband receiver for converting said replica signal to an acoustic signal; an amplitude modulated receiver connected to said second antenna for providing an output signal having the same fundamental frequency as the amplitude modulated signal; and an oscilloscope having triggering means connected to said amplitude modulated receiver for being actuated at the fundamental frequency of said amplitude modulated receiver output signal, a vertical amplitude circuit connected to receive said replica signal and a cathode ray tube connected to said triggering means and said amplitude circuit for displaying said replica signal in time increments determined by the fundamental frequency of said amplitude modulated receiver output signal.
Claim 7
Dependent Claim
196 words
A single-sideband communication system comprising: a carrier oscillator for generating a carrier frequency signal; a waveform generator for generating an amplitude modulated signal; a single-sideband generator connected to receive the carrier frequency and amplitude modulated signals for generating a suppressed carrier single-sideband signal; a first antenna connected to said single-sideband generator for transmitting said single-sideband signal; a second antenna adapted to receive said single-sideband signal; a single-sideband receiver having an adjustable tuner connected to said second antenna for producing a replica of the amplitude modulated signals; a transducer connected to said single-sideband receiver for converting said replica signal to an acoustic signal; an amplitude modulated receiver connected to said second antenna for providing an output signal having the same fundamental frequency as the amplitude modulated signal; and an oscilloscope having triggering means connected to said amplitude modulated receiver for being actuated at the fundamental frequency of said amplitude modulated receiver output signal, a vertical amplitude circuit connected to receive said replica signal and a cathode ray tube connected to said triggering means and said amplitude circuit for displaying said replica signal in time increments determined by the fundamental frequency of said amplitude modulated receiver output signal.
Claim 8
Dependent Claim
53 words
A single-sideband communication system according to claim 5 wherein said single-sideband generator further comprises: a balanced modulator for generating a suppressed carrier double-sideband signal upon receipt of said carrier frequency and said amplitude modulated signals; and a sideband filter connected to said balanced modulator for passing a single-sideband signal of said double-sideband signal.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-04-23 | 1976-10-23 | 1977-04-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-23 | 1980-10-23 | 1981-04-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-23 | 1984-10-23 | 1985-04-24 | $7700.00 | Window Closed / Lapsed |