US3404231A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Framing of pulse code transmission systems by use of an added tone signal
Assignee: AT&T Inc
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Filing: 1965-01-05
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Granted: 1968-10-01
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Expires: 1985-01-05
Abstract
No abstract record available.
Inventors
- 👤 Marvin R Aaron
- 👤 James R Gray
- 👤 Frederick A Saal
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 07:33
CPC Classifications
H; H04; H04J; H04J3/00; H04J3/02; H04J3/06; H04J3/0602; H04J3/0617; H04L; H04L7/00; H04L7/04; H04L7/08; H04L7/041; H04L2007/047; H04L7/02; H04L7/027
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
174 words
APPARATUS FOR AUTOMATICALLY REFRAMING THE RECEIVER OF A PULSE CODE TRANSMISSION SYSTEM AT WHICH THERE IS RECEIVED A SEQUENCE OF CODE WORDS IN WHICH EACH CODE WORD COMPRISES N PULSES REPRESENTING IN BINARY FORM THE AMPLITUDE OF THE SUM OF ONE SAMPLE OF AN INPUT SIGNAL AND ONE SIMULTANEOUSLY OBTAINED SAMPLE OF A TONE SIGNAL, WHERE N IS A SELECTED POSITIVE INTEGER, SAID TONE SIGNAL HAVING A FREQUENCY WHICH IS A PREDETERMINED SUBMULTIPLE OF THE FREQUENCY AT WHICH SAID INPUT SIGNAL AND SAID TONE SIGNAL ARE SAMPLED, WHICH COMPRISES: MEANS FOR DERIVING FROM A PREDETERMINED PLURALITY OF CODE WORDS IN SAID SEQUENCE A CONTROL SIGNAL INDICATIVE OF BOTH THE AVERAGE MAGNITUDE AND THE PHASE OF PULSE OCCUPYING THE MOST SIGNIFICANT DIGIT POSITION IN EACH OF SAID PLURALITY OF CODE WORDS, MEANS FOR COMPARING SAID CONTROL SIGNAL WITH A SELECTED REFERENCE SIGNAL TO DERIVE A FRAMING SIGNAL THAT REPRESENTS THE FRAMING CONDITION OF SIAD RECEIVER, AND MEANS RESPONSIVE TO SAID FRAMING SIGNAL FOR ADJUSTING SAID SEQUENCE OF CODE WORDS TO BRING SAID RECEIVER INTO FRAME.
Claim 2
Dependent Claim
174 words
APPARATUS FOR AUTOMATICALLY REFRAMING THE RECEIVER OF A PULSE CODE TRANSMISSION SYSTEM AT WHICH THERE IS RECEIVED A SEQUENCE OF CODE WORDS IN WHICH EACH CODE WORD COMPRISES N PULSES REPRESENTING IN BINARY FORM THE AMPLITUDE OF THE SUM OF ONE SAMPLE OF AN INPUT SIGNAL AND ONE SIMULTANEOUSLY OBTAINED SAMPLE OF A TONE SIGNAL, WHERE N IS A SELECTED POSITIVE INTEGER, SAID TONE SIGNAL HAVING A FREQUENCY WHICH IS A PREDETERMINED SUBMULTIPLE OF THE FREQUENCY AT WHICH SAID INPUT SIGNAL AND SAID TONE SIGNAL ARE SAMPLED, WHICH COMPRISES: MEANS FOR DERIVING FROM A PREDETERMINED PLURALITY OF CODE WORDS IN SAID SEQUENCE A CONTROL SIGNAL INDICATIVE OF BOTH THE AVERAGE MAGNITUDE AND THE PHASE OF PULSE OCCUPYING THE MOST SIGNIFICANT DIGIT POSITION IN EACH OF SAID PLURALITY OF CODE WORDS, MEANS FOR COMPARING SAID CONTROL SIGNAL WITH A SELECTED REFERENCE SIGNAL TO DERIVE A FRAMING SIGNAL THAT REPRESENTS THE FRAMING CONDITION OF SIAD RECEIVER, AND MEANS RESPONSIVE TO SAID FRAMING SIGNAL FOR ADJUSTING SAID SEQUENCE OF CODE WORDS TO BRING SAID RECEIVER INTO FRAME.
References Cited (Backward Citations)
US3175157A
Cited
US3294907A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-10-01 | 1972-04-01 | 1972-10-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-10-01 | 1976-04-01 | 1976-10-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-10-01 | 1980-04-01 | 1980-10-01 | $7700.00 | Window Closed / Lapsed |