Patent US5810741A successfully refreshed from Google Patents.
US3204047A
Expired / Lapsed
US
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Signal reproducing system with phase cancellation of undesired signal component
Assignee: Ampex Corp
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Filing: 1962-03-19
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Granted: 1965-08-31
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Expires: 1982-03-19
Abstract
No abstract record available.
Inventors
- 👤 Allen J Trost
- 👤 Erhard K Kietz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:25
CPC Classifications
H; H04; H04N; H04N5/00; H04N5/76; H04N5/91; H04N5/93; H04N5/931; G; G11; G11B; G11B5/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
121 words
A METHOD FOR PROVIDING COMPENSATION OF AN INTERFERENCE SIGNAL DEVELOPED IN A MAGNETIC TAPE APPARATUS THAT EMPLOYS A PILOT SIGNAL HAVING A FIXED FREQUENCY FOR TIME BASE CORRECTION OF A DATA SIGNAL THAT HAS BEEN DEMODULATED AND IS BEING REPRODUCED COMPRISING THE STEP OF: SUPPLY A SINE WAVE SIGNAL HAVING A FIXED FREQUENCY THE SAME AS THAT OF THE PILOT SIGNAL; CONTROLLING THE AMPLITUDE OF SUCH FIXED FREQUENCY SIGNAL BY MEANS OF A VARIABLE ATTENUATOR; PROVIDING A PHASE SHIFT TO SUCH FIXED FREQUENCY SIGNAL BY A VARIABLE PHASE SHIFT MEANS CAPABLE OF PROVIDING A TOTAL PHASE SHIFT EXCEEDING 360 DEGREES; AND ADDING SUCH ATTENUATED AND PHASE SHIFTED SIGNAL TO THE DATA SIGNAL THAT IS BEING REPRODUCED TO CANCEL UNDESIRABLE INTERFERENCE SIGNALS.
Claim 2
Independent Claim
121 words
A METHOD FOR PROVIDING COMPENSATION OF AN INTERFERENCE SIGNAL DEVELOPED IN A MAGNETIC TAPE APPARATUS THAT EMPLOYS A PILOT SIGNAL HAVING A FIXED FREQUENCY FOR TIME BASE CORRECTION OF A DATA SIGNAL THAT HAS BEEN DEMODULATED AND IS BEING REPRODUCED COMPRISING THE STEP OF: SUPPLY A SINE WAVE SIGNAL HAVING A FIXED FREQUENCY THE SAME AS THAT OF THE PILOT SIGNAL; CONTROLLING THE AMPLITUDE OF SUCH FIXED FREQUENCY SIGNAL BY MEANS OF A VARIABLE ATTENUATOR; PROVIDING A PHASE SHIFT TO SUCH FIXED FREQUENCY SIGNAL BY A VARIABLE PHASE SHIFT MEANS CAPABLE OF PROVIDING A TOTAL PHASE SHIFT EXCEEDING 360 DEGREES; AND ADDING SUCH ATTENUATED AND PHASE SHIFTED SIGNAL TO THE DATA SIGNAL THAT IS BEING REPRODUCED TO CANCEL UNDESIRABLE INTERFERENCE SIGNALS.
References Cited (Backward Citations)
US2113212A
Cited
US2371416A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-08-30 | 1969-03-01 | 1969-08-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-08-30 | 1973-03-01 | 1973-08-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-08-30 | 1977-03-01 | 1977-08-31 | $7700.00 | Window Closed / Lapsed |