US3593140A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pcm transmission system employing pulse regenerators
Assignee: NEC Corp
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Filing: 1969-05-05
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Granted: 1971-07-13
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Expires: 1989-05-05
Abstract
Abstract A method and apparatus for reducing the pulse jitter encountered in a pulse code modulated (PCM) transmission path is described. A timing wave is superimposed on a PCM pulse train and utilized to initiate regeneration of pulses at spaced intervals along the transmission path. The pulse jitter is significantly reduced by alternating the polarity or selecting the phase of the timing wave as it is reimposed on regenerated pulses.
Inventors
- 👤 Hisashi Kaneko
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 18:22
CPC Classifications
H; H04; H04L; H04L7/00; H04L7/04; H04L7/08; H04L25/00; H04L25/02; H04L25/20; H04L25/24; H04L25/242; H04L7/041; H04L2007/047
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
154 words
A PCM transmission system for transmitting digital signals, comprising a plurality of regenerative pulse repeaters each having means for providing an input digital signal, means coupled to said input signal providing means for extracting a first timing wave from said input signal, means coupled to said extracting means and responsive to the extRacted first timing wave for generating a second timing wave regenerating means coupled to said input signal providing means and to said second timing wave generating means for producing regenerated digital pulses and means coupled to said regenerating means and said second timing wave generating means for combining said regenerated digital pulses and said second timing wave; wherein the phase of the second timing wave in at least one of said regenerative pulse repeaters is of substantially opposite polarity with respect to the second timing wave in at least one of an immediately preceding or succeeding one of said regenerative pulse repeaters.
Claim 2
Dependent Claim
154 words
A PCM transmission system for transmitting digital signals, comprising a plurality of regenerative pulse repeaters each having means for providing an input digital signal, means coupled to said input signal providing means for extracting a first timing wave from said input signal, means coupled to said extracting means and responsive to the extRacted first timing wave for generating a second timing wave regenerating means coupled to said input signal providing means and to said second timing wave generating means for producing regenerated digital pulses and means coupled to said regenerating means and said second timing wave generating means for combining said regenerated digital pulses and said second timing wave; wherein the phase of the second timing wave in at least one of said regenerative pulse repeaters is of substantially opposite polarity with respect to the second timing wave in at least one of an immediately preceding or succeeding one of said regenerative pulse repeaters.
Claim 3
Dependent Claim
25 words
The system as recited in claim 1, wherein the frequency of said second timing wave is equal to the transmission rate of said digital pulses.
Claim 4
Dependent Claim
29 words
The system as recited in claim 1, wherein the frequency of said second timing wave is equal to an integral division of the transmission rate of said digital 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) | 1974-07-12 | 1975-01-11 | 1975-07-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-12 | 1979-01-11 | 1979-07-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-12 | 1983-01-11 | 1983-07-13 | $7700.00 | Window Closed / Lapsed |