Patent US4489354A successfully refreshed from Google Patents.
US4489354A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Information recording system with recording process monitoring function
Assignee: METRUM-D Inc
•
Filing: 1982-08-16
•
Granted: 1984-12-18
•
Expires: 2002-08-16
Abstract
Abstract The same recording head or heads may be employed to record both an information signal and a synchronization word signal. Where at least two recording heads provide overlap intervals in the recording of the information signal, the synchronization word signal may be recorded in such overlap intervals. Upon playback, the synchronization word signal may be employed to control at least part of the reproduction of the information signal.
Inventors
- 👤 Bert H. Dann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 14:53
CPC Classifications
G; G11; G11B; G11B15/00; G11B15/02; G11B15/05; G11B15/087; G11B20/00; G11B20/10; G11B20/18; G11B20/1816; G11B27/00; G11B27/10; G11B27/19; G11B27/28; G11B27/30; G11B27/3027; G11B27/36; G11B5/00; G11B5/008; G11B5/00813; G11B5/00847; G11B5/0086; G11B2220/00; G11B2220/90; G11B27/34
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
167 words
In an information recording apparatus having at least two movable recording heads arranged for making successive operative recording sweeps across a magnetic tape wherein an initial portion of a recording sweep of one head overlaps in time with a final portion of a recording sweep of a second head, to provide uninterrupted recording of an information signal in a recording format in which information recorded during an overlap interval is duplicated, the improvement comprising: a. synchronizing means, operable during the overlap interval, for producing a synchronization signal; and b. timing means, operably associated with at least one of the recording heads and said synchronizing means, for time division multiplexing of the synchronization signal and the information signal, to cause one of the recording heads to temporarily interrupt the recording of the information signal to record the synchronization signal during the overlap interval, whereby the portion of the information signal lost by the time division multiplexing of the synchronization signal is recorded by the other of the heads.
Claim 2
Dependent Claim
167 words
In an information recording apparatus having at least two movable recording heads arranged for making successive operative recording sweeps across a magnetic tape wherein an initial portion of a recording sweep of one head overlaps in time with a final portion of a recording sweep of a second head, to provide uninterrupted recording of an information signal in a recording format in which information recorded during an overlap interval is duplicated, the improvement comprising: a. synchronizing means, operable during the overlap interval, for producing a synchronization signal; and b. timing means, operably associated with at least one of the recording heads and said synchronizing means, for time division multiplexing of the synchronization signal and the information signal, to cause one of the recording heads to temporarily interrupt the recording of the information signal to record the synchronization signal during the overlap interval, whereby the portion of the information signal lost by the time division multiplexing of the synchronization signal is recorded by the other of the heads.
Claim 3
Dependent Claim
27 words
Apparatus as defined in claim 1 wherein said timing means is operated alternately with the recording heads in synchronism with their respective operative sweeps across the tape.
Claim 4
Dependent Claim
40 words
Apparatus as defined in claim 1 wherein said timing means is operated in synchronism with the recording head initiating its sweep for time division multiplexing of the synchronization signal with the information signal applied to the head initiating its sweep.
Claim 5
Dependent Claim
24 words
Apparatus as defined in claim 2 in which the synchronization signal functions to control an operation relating to the playback of the information signal.
Claim 6
Dependent Claim
45 words
Apparatus as defined in claim 4 in which the information signal is recorded together with a continuous pilot signdl for time-base correction of the information signal during playback, wherein said synchronizing means includes generating means, responsive to the pilot signal, for producing the synchronization signal.
Claim 7
Dependent Claim
24 words
Apparatus as defined in claim 5 wherein said generating means encodes the pilot signal into a binary bit pattern representative of the synchronization signal.
Claim 8
Dependent Claim
63 words
Apparatus as defined in claim 2 wherein said timing means includes tachometer means, responsive to the recording heads, for producing a control signal corresponding to the position of the recording heads relative to their respective operative sweeps, wherein said timing means includes switching means, responsive to the control signal, for causing the time division multiplexing of the synchronization signal with the information signal.
References Cited (Backward Citations)
US3188615A
Cited
US3294902A
Cited
US3532808A
Cited
US4263625A
Cited
US4389681A
Cited
US4413288A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-12-18 | 1988-06-18 | 1988-12-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-12-18 | 1992-06-18 | 1992-12-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-12-18 | 1996-06-18 | 1996-12-18 | $7700.00 | Window Closed / Lapsed |