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US3745458A
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Synchronous detecting device for psk polyphase wave
Assignee: Fujitsu Ltd
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Filing: 1971-08-09
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Granted: 1973-07-10
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Expires: 1991-08-09
Abstract
Abstract A synchronous detecting device for detecting phase shift keyed waves utilized in satellite communications and the like multiplies the PSK signals by 2 in a first plurality of multipliers and multiplies a plurality of reference carriers in a second plurality of multipliers. The multiplied signals are applied to a plurality of phase detectors. The PSK signals and the reference carriers are applied directly to another plurality of phase detectors. The phase detectors produce outputs proportional to the phase differences between the multiplied signals and the multiplied reference carriers whereby n phase detectors discriminate 2n phases.
Inventors
- 👤 H Nakamura
- 👤 N Toyonaga
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 09:00
CPC Classifications
H; H04; H04L; H04L27/00; H04L27/18; H04L27/22; H04L27/227; H04L27/2275; H04L27/2278
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
262 words
A synchronous detecting device, comprising first input means for supplying PSK polyphase signals; second input means for supplying reference carriers; a first plurality of frequency doublers coupled in series to the first input means for multiplying the PSK signals in sequence by 2; a second plurality of frequency doublers coupled in series to the second input means for multiplying the reference carriers in sequence by 2, the total number of doublers being equal to n-1, the number of doublers in each of the first and second pluralities of doublers being equal and each doubler multiplying an input signal by 2; a first phase detector coupled to the first and second input means for detecting the phase difference between the PSK signals and the reference carriers; a second phase detector coupled to a first doubler of each of the first and second pluralities of doublers for detecting the phase difference between the PSK signals multiplied by 2 and the reference carriers multiplied by 2; a third phase detector coupled to a second doubler of each of the first and second pluralities of doublers for detecting the phase difference between the PSK signals multiplied by 4 and the reference carriers muLtiplied by 4; an nth phase detector coupled to an n-1th doubler of each of the first and second pluralities of doublers for detecting the phase difference between the PSK signals multiplied by 2n 1 and the reference carriers multiplied by 2n 1; a plurality of output means each coupled to a corresponding one of the phase detectors for providing the detected output signals.
Claim 2
Dependent Claim
262 words
A synchronous detecting device, comprising first input means for supplying PSK polyphase signals; second input means for supplying reference carriers; a first plurality of frequency doublers coupled in series to the first input means for multiplying the PSK signals in sequence by 2; a second plurality of frequency doublers coupled in series to the second input means for multiplying the reference carriers in sequence by 2, the total number of doublers being equal to n-1, the number of doublers in each of the first and second pluralities of doublers being equal and each doubler multiplying an input signal by 2; a first phase detector coupled to the first and second input means for detecting the phase difference between the PSK signals and the reference carriers; a second phase detector coupled to a first doubler of each of the first and second pluralities of doublers for detecting the phase difference between the PSK signals multiplied by 2 and the reference carriers multiplied by 2; a third phase detector coupled to a second doubler of each of the first and second pluralities of doublers for detecting the phase difference between the PSK signals multiplied by 4 and the reference carriers muLtiplied by 4; an nth phase detector coupled to an n-1th doubler of each of the first and second pluralities of doublers for detecting the phase difference between the PSK signals multiplied by 2n 1 and the reference carriers multiplied by 2n 1; a plurality of output means each coupled to a corresponding one of the phase detectors for providing the detected output signals.
Claim 3
Dependent Claim
143 words
A synchronous detecting device as claimed in claim 1, further comprising a first plurality of hybrids each coupled between a doubler of the first plurality of frequency doublers and the next-succeeding doubler of the first plurality of frequency doublers and a corresponding one of the phase detectors, a first of the first plurality of hybrids being connected between the first input means and the first doubler of the first plurality of doublers and the first phase detector, and a second plurality of hybrids each coupled between a doubler of the second plurality of frequency doublers and the next-succeeding doubler of the second plurality of doublers and a corresponding one of the phase detectors, a first of the second plurality of hybrids being connected between the second input means and the first doubler of the second plurality of doublers and the first phase detector.
Claim 4
Dependent Claim
36 words
A synchronous detecting device as claimed in claim 2, further comprising a plurality of phase shifters each connected between a corresponding hybrid of the second plurality of hybrids and a corresponding one of the phase detectors.
Claim 5
Dependent Claim
46 words
A synchronous detecting device as claimed in claim 3, further comprising a plurality of bandpass filters each connected between a corresponding doubler of each of the first and second pluralities of doublers and a corresponding hybrid of each of the first and second pluralities of hybrids.
Claim 6
Dependent Claim
35 words
A synchronous detecting device as claimed in claim 4, further comprising a plurality of low pass filters each connected between a corresponding one of the phase detectors and a corresponding one of the output means.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-07-09 | 1977-01-08 | 1977-07-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-09 | 1981-01-08 | 1981-07-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-09 | 1985-01-08 | 1985-07-10 | $7700.00 | Window Closed / Lapsed |