US3560855A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic equalizer utilizing error control information
Assignee: AT&T Inc
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Filing: 1968-06-07
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Granted: 1971-02-02
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Expires: 1988-06-07
Abstract
Abstract AN AUTOMATIC PASSBAND EQUALIZER FOR DIFFERENTIALLY COHERENT PHASE-MODULATION DATA TRANSMISSION SYSTEMS IS MADE ADAPTIVE TO ERROR INFORMATION DERIVED BY CORRELATING PHASE DIFFERENCES BETWEEN SUCCESSIVE ADJACENT SIGNALING INTERVALS WITH PHASE DIFFERENCES BETWEEN NONADJACENT SIGNALING INTERVALS SPANNING SUCH ADJACENT INTERVALS. THE ERROR INFORMATION IS PERIODICALLY INTEGRATED AND QUENCHED. DIFFERENCES BETWEEN SUCCESSIVE MAXIMUM INTEGRATION LEVELS YIELD A DISTORTION INDEX BY THE AID OF WHICH INCREMENTAL ADJUSTMENTS OF TAP ATTENUATORS IN A TRANSVERSAL EQUALIZER IN SERIES WITH A DATA DEMODULATOR ARE DIRECTED TO MINIMIZE SUCH DISTORTION.
Inventors
- 👤 Henry C Schroeder
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 21:32
CPC Classifications
H; H04; H04L; H04L27/00; H04L27/01
Claims Analysis
Total Claims: 0
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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) | 1974-02-01 | 1974-08-03 | 1975-02-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-01 | 1978-08-03 | 1979-02-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-01 | 1982-08-03 | 1983-02-02 | $7700.00 | Window Closed / Lapsed |