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US4250456A
Expired / Lapsed
US
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Device for demodulating PSK-FM double modulated carrier signals
Assignee: NEC Corp
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Filing: 1979-03-14
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Granted: 1981-02-10
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Expires: 1999-03-14
Abstract
Abstract A demodulator for PSK-FM double modulated carrier signals in which the carrier signal is 2 N phase modulated by a main signal and frequency modulated by a sub-signal. A clock component is extracted from the received double-modulated carrier signal and the carrier signal sampled in accordance therewith. The amplitude of the output of the sampling gate is limited prior to frequency multiplication by 2 N . A frequency modulated component is then demodulated from the multiplied signal.
Inventors
- 👤 Saburo Shinmyo
- 👤 Yoichi Tan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 11:59
CPC Classifications
H; H04; H04L; H04L5/00; H04L5/02; H04J; H04J9/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
90 words
A demodulator for a double-modulated carrier signal in which the carrier signal is 2 N -phase-modulated by a main signal and then frequency-modulated by a sub-signal comprising: means for extracting a clock component from said double-modulated carrier signal; means for sampling said double-modulated carrier signal in accordance with the output of said extracting means; means for limiting an amplitude of the output of said sampling means; means for frequency-multiplying the output of said limiting means by 2 N ; and, means for demodulating a frequency-modulated signal from said frequency-multiplying means.
Claim 2
Dependent Claim
90 words
A demodulator for a double-modulated carrier signal in which the carrier signal is 2 N -phase-modulated by a main signal and then frequency-modulated by a sub-signal comprising: means for extracting a clock component from said double-modulated carrier signal; means for sampling said double-modulated carrier signal in accordance with the output of said extracting means; means for limiting an amplitude of the output of said sampling means; means for frequency-multiplying the output of said limiting means by 2 N ; and, means for demodulating a frequency-modulated signal from said frequency-multiplying means.
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) | 1984-02-10 | 1984-08-11 | 1985-02-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-02-10 | 1988-08-11 | 1989-02-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-02-10 | 1992-08-11 | 1993-02-10 | $7700.00 | Window Closed / Lapsed |