Patent US3440548A successfully refreshed from Google Patents.
US3440548A
Expired / Lapsed
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Timing recovery circuit using time derivative of data signals
Assignee: AT&T Inc
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Filing: 1966-10-06
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Granted: 1969-04-22
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Expires: 1986-10-06
Abstract
No abstract record available.
Inventors
- 👤 Burton R Saltzberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:45
CPC Classifications
H; H04; H04L; H04L7/00; H04L7/02; H04L7/033; H04L7/0334
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
100 words
A TIMING RECOVERY CIRCUIT FOR SYNCHRONOUS DIGITAL DATA COMPRISING MEANS TAKING THE TIME DERIVATIVE OF THE RECEIVED DATA TRAIN, MEANS DETECTING THE POLARITY OF THE SYMBOLS IN THE RECEIVED DATA TRAIN, MEANS CORRELATING TIME-SPACED SIMULTANEOUS SAMPLES OF THE OUTPUTS OF SAID TAKING AND DETECTING MEANS TO FORM A PRODUCT WAVE, MEANS INTEGRATING SAID PRODUCT WAVE TO FORM A CONTROL WAVE, A CLOCK SOURCE SUPPLYING SIMULTANEOUS SAMPLING PULSES TO SAID TAKING AND DETECTING MEANS, AND PHASE CONTROL MEANS RESPONSIVE TO SAID CONTROL WAVE CAUSING SAID CLOCK SOURCE TO GENERATE SAMPLING PULSES AT INSTANTS OF THE OPTIMUM RESPONSE OF SAID DATA TRAIN.
Claim 2
Dependent Claim
100 words
A TIMING RECOVERY CIRCUIT FOR SYNCHRONOUS DIGITAL DATA COMPRISING MEANS TAKING THE TIME DERIVATIVE OF THE RECEIVED DATA TRAIN, MEANS DETECTING THE POLARITY OF THE SYMBOLS IN THE RECEIVED DATA TRAIN, MEANS CORRELATING TIME-SPACED SIMULTANEOUS SAMPLES OF THE OUTPUTS OF SAID TAKING AND DETECTING MEANS TO FORM A PRODUCT WAVE, MEANS INTEGRATING SAID PRODUCT WAVE TO FORM A CONTROL WAVE, A CLOCK SOURCE SUPPLYING SIMULTANEOUS SAMPLING PULSES TO SAID TAKING AND DETECTING MEANS, AND PHASE CONTROL MEANS RESPONSIVE TO SAID CONTROL WAVE CAUSING SAID CLOCK SOURCE TO GENERATE SAMPLING PULSES AT INSTANTS OF THE OPTIMUM RESPONSE OF SAID DATA TRAIN.
References Cited (Backward Citations)
US3252099A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-04-21 | 1972-10-21 | 1973-04-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-04-21 | 1976-10-21 | 1977-04-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-04-21 | 1980-10-21 | 1981-04-22 | $7700.00 | Window Closed / Lapsed |