Patent US4163262A successfully refreshed from Google Patents.
US4163262A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Helical video tape recorder arrangement suitable for high quality editing
Assignee: AT&T Intellectual Property II LP
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Filing: 1976-01-02
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Granted: 1979-07-31
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Expires: 1996-01-02
Abstract
Abstract Disclosed is a helical scan video tape recorder having a flying sense head located upstream from a flying erase head and further upstream from a flying record/playback head. By employing a separate sense head to detect synch pulses, tension and relative speed of the video tape are controlled so as to eliminate synchronization errors in consequence of editing operations.
Inventors
- 👤 Harry Kaemmerer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 11:07
CPC Classifications
G; G11; G11B; G11B27/00; G11B27/02; G11B27/022; G11B27/029
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
162 words
An editing system for a helical video tape recorder having a supply and take-up arrangement for video tape capable of storing video and synchronization information on parallel diagonal tracks thereon, a rotating and slotted drum over whose surface video tape from such supply and take-up arrangement moves in its direction of rotation and within whose slot a counter-rotating disc provides support for transducer heads in contact with tape passing on the surface of such drum comprising: at least one record-reproduce transducer head mounted on said disc for alternative recording or sensing of video information on said moving tape, at least one synchronization-sensing transducer head mounted on said disc in advance with respect to the direction of rotation thereof of said record-reproduce transducer head for responding to synchronization information on said moving tape, and at least one erasing transducer head mounted on said disc intermediate of said record-reproduce and synchronization-sensing heads for erasing video information to be edited out without destroying synchronization information.
Claim 2
Dependent Claim
162 words
An editing system for a helical video tape recorder having a supply and take-up arrangement for video tape capable of storing video and synchronization information on parallel diagonal tracks thereon, a rotating and slotted drum over whose surface video tape from such supply and take-up arrangement moves in its direction of rotation and within whose slot a counter-rotating disc provides support for transducer heads in contact with tape passing on the surface of such drum comprising: at least one record-reproduce transducer head mounted on said disc for alternative recording or sensing of video information on said moving tape, at least one synchronization-sensing transducer head mounted on said disc in advance with respect to the direction of rotation thereof of said record-reproduce transducer head for responding to synchronization information on said moving tape, and at least one erasing transducer head mounted on said disc intermediate of said record-reproduce and synchronization-sensing heads for erasing video information to be edited out without destroying synchronization information.
Claim 3
Dependent Claim
66 words
The editing system of claim 1 further comprising: tape tension and relative speed control means; a standard timing signal source for synchronization control; means jointly responsive to signals from said synchronization-sensing head and to said timing source for developing an error signal; and means responsive to said error signal for controlling said tape tension and relative speed control means so as to diminish said error signal.
Claim 4
Dependent Claim
28 words
The editing system of claim 2 wherein said error signal is proportional to the timing difference between the output signal from said synchronization-sensing head and said timing signal.
Claim 5
Dependent Claim
28 words
The editing system of claim 2, wherein said error signal is proportional to the frequency difference between the output signal from said synchronization-sensing head and said timing signal.
Claim 6
Dependent Claim
37 words
The editing system of claim 1, wherein there are two each of said record-reproduce heads, said synchronization-sensing head and said erasing head mounted in respective pairs at diametrically opposed positions on the rim of said counter-rotating disc.
Claim 7
Dependent Claim
40 words
The editing system of claim 5 wherein the outputs of said multiple synchronization-sensing heads are combined to form a synchronization train of impulses occurring at a frequency which is an integral multiple of the rotation speed of said counter-rotating disc.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-07-30 | 1983-01-29 | 1983-07-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-07-30 | 1987-01-29 | 1987-07-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-07-30 | 1991-01-29 | 1991-07-31 | $7700.00 | Window Closed / Lapsed |