US3760111A
Expired / Lapsed
US
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Pulse regenerative repeater for a multilevel pulse communication system
Assignee: NEC Corp
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Filing: 1971-06-14
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Granted: 1973-09-18
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Expires: 1991-06-14
Abstract
Abstract Disclosed herein is a pulse regeneration repeater system which includes means for extracting from a train of multi-level code pulses the clock signal defining the bit interval. Received code pulses, prior to entering a clock signal extracting circuit, pass through a distortion compensating equalizing circuit. The equalizing circuit modifies the pulses in the code pulse train to produce output pulses having a half-level width T'' less than the clock period T, but greater than one-half of the clock period in response to code signals which, prior to transmission distortion, have a half-level width of T/2.
Inventors
- 👤 A Sawai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 03:07
CPC Classifications
H; H04; H04L; H04L25/00; H04L25/02; H04L25/20; H04L25/24; H04L25/242; H04L7/00; H04L7/02; H04L7/027
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
193 words
A pulse regenerative repeater for a multilevel pulse communication system employing multilevel code pulses comprising: a first equalizing means for equalizing received code pulses, said first equalizing means producing only one isolated pulse with a half-level width narrower than 90 percent of the clock period of said received code pulses when an original isolated rectangular pulse having the pulse width equal to one-half of said clock period is applied to the input thereof; means for folding the output of said first equalizing means on the amplitude axis; a tank circuit for extracting the clock frequency component from the output of said folding means; means for limiting the output of said tank circuit to a predetermined level to deliver a clock signal with a constant amplitude; a second equalizing means for equalizing the received code pulses, said second equalizing means producing only one isolated pulse with a half-level width substantially equal to 100 percent of the clock period when said original isolated rectangular pulse is applied to the input thereof; and means for recognizing each level of the output of said second equalizing means by using said clock signal to deliver regenerated multilevel pulses.
Claim 2
Dependent Claim
193 words
A pulse regenerative repeater for a multilevel pulse communication system employing multilevel code pulses comprising: a first equalizing means for equalizing received code pulses, said first equalizing means producing only one isolated pulse with a half-level width narrower than 90 percent of the clock period of said received code pulses when an original isolated rectangular pulse having the pulse width equal to one-half of said clock period is applied to the input thereof; means for folding the output of said first equalizing means on the amplitude axis; a tank circuit for extracting the clock frequency component from the output of said folding means; means for limiting the output of said tank circuit to a predetermined level to deliver a clock signal with a constant amplitude; a second equalizing means for equalizing the received code pulses, said second equalizing means producing only one isolated pulse with a half-level width substantially equal to 100 percent of the clock period when said original isolated rectangular pulse is applied to the input thereof; and means for recognizing each level of the output of said second equalizing means by using said clock signal to deliver regenerated multilevel pulses.
Claim 3
Dependent Claim
94 words
In a pulse regenerative repeater for a multilevel pulse communication system utilizing multilevel code pulses, the combination comprising first equalizing means having a half-level equalization response of less than 100 percent; means responsive to the output of said first equalizing means for extracting a clock signal from a series of multilevel code pulses; second equalizing means receiving said multilevel code pulses and having a half-level equalization response of 100 percent; and recognition circuit means responsive to the extracted clock signal and the output of said second equalizing means for reproducing the received code pulses.
Claim 4
Dependent Claim
94 words
In a pulse regenerative repeater for a multilevel pulse communication system utilizing multilevel code pulses, the combination comprising first equalizing means having a half-level equalization response of less than 100 percent; means responsive to the output of said first equalizing means for extracting a clock signal from a series of multilevel code pulses; second equalizing means receiving said multilevel code pulses and having a half-level equalization response of 100 percent; and recognition circuit means responsive to the extracted clock signal and the output of said second equalizing means for reproducing the received code pulses.
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) | 1976-09-17 | 1977-03-19 | 1977-09-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-17 | 1981-03-19 | 1981-09-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-17 | 1985-03-19 | 1985-09-18 | $7700.00 | Window Closed / Lapsed |