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US3745249A
Expired / Lapsed
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Regenerative transmission system for digital signals
Assignee: TE Connectivity Germany GmbH
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Filing: 1971-06-21
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Granted: 1973-07-10
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Expires: 1991-06-21
Abstract
Abstract A repeater for binary signals, inserted in a transmission path, includes in its input circuit a narrow-band filter with a pass band whose midfrequency substantially equals half the basic pulse cadence 1/T whereby any change in signal voltage from ''''0'''' to ''''1'''' or vice versa gives rise to a sinusoidal half-cycle of one or the other polarity. The two polarities are separated to yield two unipolar pulse trains which are passed through respective low-pass filters cutting off above the aforementioned midfrequency whereby the pulses of each train are broadened to substantially double their original width and high-frequency noise is largely excluded. As the trough between two consecutive pulses of one train always coincides with a pulse of the other train, a cap clipped off the last-mentioned pulse may be added to the first train to deepen the trough and to improve the signalto-noise ratio. A succession of sync pulses, derived from the incoming signals, serves to enable a flip-flop for alternate setting and resetting by respective pulses from the two unipolar trains whereby a replica of the original binary message is generated in the output of that flip-flop.
Inventors
- 👤 R Weiss
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 17:00
CPC Classifications
H; H04; H04L; H04L25/00; H04L25/02; H04L25/20; H04L25/24; H04L25/242
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
155 words
A regenerative transmission system for binary signals represented by a recurrent switchover between a first and a second voltage level at intervals equaling a whole number of basic pulse periods T, including at least one repeater inserted in a transmission path for said signals, said repeater comprising an input circuit for incoming signals subject to distortion and an output circuit for the retransmission of such signals in regenerated form; said input circuit including filter stage for cutting off all frequencies substantially lower than 1/2 T whereby voltage changes from said first to said second level and voltage changes from said second to said first level give rise to a succession of sinusoidal half-cycles of opposite polarities separated by low-level voltages in the case of switchover intervals substantially greater than T; said output circuit including bistable means settable by half-cycles of one polarity and resettable by half-cycles of the other polarity generated by said filter stage.
Claim 2
Dependent Claim
155 words
A regenerative transmission system for binary signals represented by a recurrent switchover between a first and a second voltage level at intervals equaling a whole number of basic pulse periods T, including at least one repeater inserted in a transmission path for said signals, said repeater comprising an input circuit for incoming signals subject to distortion and an output circuit for the retransmission of such signals in regenerated form; said input circuit including filter stage for cutting off all frequencies substantially lower than 1/2 T whereby voltage changes from said first to said second level and voltage changes from said second to said first level give rise to a succession of sinusoidal half-cycles of opposite polarities separated by low-level voltages in the case of switchover intervals substantially greater than T; said output circuit including bistable means settable by half-cycles of one polarity and resettable by half-cycles of the other polarity generated by said filter stage.
Claim 3
Dependent Claim
63 words
A system as defined in claim 1 wherein said repeater further includes an integrating stage, connected to the output of said filter stage for deriving therefrom a slowly varying mean voltage, and additive circuitry ahead of said output circuit for superimposing said means voltage upon said succession of sinusoidal half-cycles with a polarity substantially compensating for deviations of said low-level voltages from zero.
Claim 4
Dependent Claim
33 words
A system as defined in claim 2 wherein said integrating stage includes an R/C network, said additive circuitry comprising a summing amplifier with input connections to said network and to said filter stage.
Claim 5
Dependent Claim
42 words
A system as defined in claim 1 wherein said repeater further includes nonlinear impedance means between said input and output circuits for splitting said sequence into two unipolar pulse trains of opposite polarities fed to sAid bistable means over separate signal paths.
Claim 6
Dependent Claim
50 words
A system as defined in claim 4, further comprising low-pass filter means in said signal paths with a cutoff frequency not higher than about 1/2 T for effectively broadening the unipolar pulses of each train to at least twice their original width prior to their application to said bistable means.
Claim 7
Dependent Claim
63 words
A system as defined in claim 5 wherein said repeater further includes a clipping stage in cascade with said low-pass filter means for cutting caps of maximum width T from the unipolar pulses of one polarity and circuit means for superimposing said caps upon the unipolar pulse train of opposite polarity to increase the effective separation of consecutive pulses of the latter train.
Claim 8
Dependent Claim
100 words
A system as defined in claim 6 wherein said nonlinear impedance means, said-low-pass filter means and said clipping means comprise a first diode, a first filter and a first clipper serially connected in one of said signal paths and a second diode, a second filter and a second clipper serially connected in the other of said signal paths, said circuit means including first and second summing circuits in said signal paths ahead of said first and second clippers, respectively, and cross-connections from the outputs of said first and second clippers to the inputs of said second and first summing circuits.
Claim 9
Dependent Claim
48 words
A system as defined in claim 7 wherein said first and second summing circuits comprise a pair of operational amplifiers with reactive input impedances forming part of said first and second filters, said cross-connections terminating at the junctions of said reactive input impedances with the corresponding operational amplifiers.
Claim 10
Dependent Claim
19 words
A system as defined in claim 7 wherein said first and second clippers are a pair of Zener diodes.
Claim 11
Dependent Claim
65 words
A system as defined in claim 4 wherein said repeater includes a source of timing pulses connected to said input circuit for synchronization with the incoming signals, said bistable means comprising a pair of switching stages respectively connected to said signal paths for energization by the unipolar pulses thereof, both said stages being further connected to said source for periodic enablement by said timing pulses.
Claim 12
Dependent Claim
40 words
A system as defined in claim 10 wherein said bistable means comprises a flip-flop with a setting input and a resetting input respectively connected to said signal paths, said flip-flop further having a common enabling input connected to said source.
Claim 13
Dependent Claim
23 words
A system as defined in claim 1 wherein said filter stage comprises a damped resonant circuit tuned to substantially the frequency 1/2 T.
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) | 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 |