US3575665A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Asynchronous demodulation system for pulse position modulation signal utilizing phase or frequency modulated higher harmonic of a sampling frequency
Assignee: NEC Corp
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Filing: 1968-06-12
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Granted: 1971-04-20
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Expires: 1988-06-12
Abstract
Abstract A system for demodulating pulse-position modulated (PPM) signals derives a phase or frequency-modulated wave from the incoming PPM signals through a band-pass filter having a center frequency substantially equal to an integral multiple of the sampling frequency of the incoming PPM signals. The phase- or frequencymodulated wave is then demodulated.
Inventors
- 👤 Takamichi Honma
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 07:32
CPC Classifications
H; H04; H04J; H04J3/00; H04J3/16; H04J3/1676; H03; H03K; H03K9/00; H03K9/04; H04L; H04L7/00; H04L7/02; H04L7/027
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
95 words
A pulse position modulation demodulation system for demodulating incoming pulse position modulation signals having a known sampling frequency, said system comprising a source of a pulse position modulated signal including a continuous modulated wave component, said modulating wave component having a carrier frequency which is a predetermined integral order harmonic frequency of the sampling frequency of the pulse position modulated signal, a band-pass filter coupled to said source for passing said modulated component and demodulator means coupled to the output of said band-pass filter for demodulating said modulated component that passes through said band-pass filter.
Claim 2
Dependent Claim
95 words
A pulse position modulation demodulation system for demodulating incoming pulse position modulation signals having a known sampling frequency, said system comprising a source of a pulse position modulated signal including a continuous modulated wave component, said modulating wave component having a carrier frequency which is a predetermined integral order harmonic frequency of the sampling frequency of the pulse position modulated signal, a band-pass filter coupled to said source for passing said modulated component and demodulator means coupled to the output of said band-pass filter for demodulating said modulated component that passes through said band-pass filter.
Claim 3
Dependent Claim
49 words
The demodulation system defined in claim 1, further comprising a blanking gate means provided ahead of said band-pass filter for passing said pulse position modulated signal, and means for controlling said blanking gate means so as to pass said pulse position modulated signal during only a predetermined time period.
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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) | 1974-04-19 | 1974-10-19 | 1975-04-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-19 | 1978-10-19 | 1979-04-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-19 | 1982-10-19 | 1983-04-20 | $7700.00 | Window Closed / Lapsed |