US3368168A
Expired / Lapsed
US
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Adaptive equalizer for digital transmission systems having means to correlate present error component with past, present and future received data bits
Assignee: AT&T Inc
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Filing: 1965-06-02
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Granted: 1968-02-06
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Expires: 1985-06-02
Abstract
No abstract record available.
Inventors
- 👤 Robert W Lucky
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 17:51
CPC Classifications
H; H04; H04L; H04L25/00; H04L25/02; H04L25/03; H04L25/03006; H04L25/03012; H04L25/03114; H04L25/03127
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
137 words
APPARATUS FOR ADAPTIVELY AND CONTINUOUSLY ADJUSTING THE ATTENUATORS IN A TRANSVERSAL EQUALIZER CONNECTED TO A DISTORTING TRANSMISSION CHANNEL COMPRISING A DIGITAL DATA SOURCE APPLYING SIGNALS TO SAID CHANNEL, MEANS SAMPLING AT SIGNALING INTERVALS THE OUTPUT AMPLITUDE OF SAID EQUALIZER AFTER SAID SIGNALS HAVE TRAVERSED SAID CHANNEL AND EQUALIZER, MEANS SLICING THE OUTPUT OF SAID EQUALIZER TO A STANDARD AMPLITUDE AT THE CORRECT POLARITY TO REPRESENT EACH ESTIMATED DATA SIGNAL, MEANS TAKING THE DIFFERENCE BETWEEN THE OUTPUTS OF SAID SAMPLING AND SLICING MEANS TO OBTAIN AN OVERALL DISTORTION COMPONENT, MEANS MULTIPLYING THE PRESENT DISTORTION COMPONENT BY SUCCESSIVE OUTPUTS OF SAID SLICING MEANS, MEANS SEPARATELY INTEGRATING THE SUCCESSIVE PRODUCTS FROM SAID MULTIPLYING MEANS OVER A PLURALITY OF DATA INTERVALS, AND MEANS INCREMENTALLY ADJUSTING SAID ATTENUATORS IN INVERSE RELATION TO THE POLARITY OF THE SEPARATE OUTPUTS OF SAID INTEGRATING MEANS.
Claim 2
Dependent Claim
137 words
APPARATUS FOR ADAPTIVELY AND CONTINUOUSLY ADJUSTING THE ATTENUATORS IN A TRANSVERSAL EQUALIZER CONNECTED TO A DISTORTING TRANSMISSION CHANNEL COMPRISING A DIGITAL DATA SOURCE APPLYING SIGNALS TO SAID CHANNEL, MEANS SAMPLING AT SIGNALING INTERVALS THE OUTPUT AMPLITUDE OF SAID EQUALIZER AFTER SAID SIGNALS HAVE TRAVERSED SAID CHANNEL AND EQUALIZER, MEANS SLICING THE OUTPUT OF SAID EQUALIZER TO A STANDARD AMPLITUDE AT THE CORRECT POLARITY TO REPRESENT EACH ESTIMATED DATA SIGNAL, MEANS TAKING THE DIFFERENCE BETWEEN THE OUTPUTS OF SAID SAMPLING AND SLICING MEANS TO OBTAIN AN OVERALL DISTORTION COMPONENT, MEANS MULTIPLYING THE PRESENT DISTORTION COMPONENT BY SUCCESSIVE OUTPUTS OF SAID SLICING MEANS, MEANS SEPARATELY INTEGRATING THE SUCCESSIVE PRODUCTS FROM SAID MULTIPLYING MEANS OVER A PLURALITY OF DATA INTERVALS, AND MEANS INCREMENTALLY ADJUSTING SAID ATTENUATORS IN INVERSE RELATION TO THE POLARITY OF THE SEPARATE OUTPUTS OF SAID INTEGRATING MEANS.
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) | 1971-02-05 | 1971-08-07 | 1972-02-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-02-05 | 1975-08-07 | 1976-02-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-02-05 | 1979-08-07 | 1980-02-06 | $7700.00 | Window Closed / Lapsed |