US3737568A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Video recording system
Assignee: IIT Research Institute
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Filing: 1971-12-13
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Granted: 1973-06-05
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Expires: 1991-12-13
Abstract
Abstract In the disclosed embodiments the video signal is recorded on successive longitudinal tracks with high frequency bias. The sound may be recorded transversely on adjacent tracks or may be recorded with the video as pulse modulation in the horizontal blanking intervals. The video bias frequency is selected so as to avoid beat notes with the video signal. The horizontal and vertical sync signals may be amplified separate from the composite video and then added thereto so as to record sync signals of increased amplitude. The picture signal from a television receiver may be recorded without further amplification.
Inventors
- 👤 M Camras
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 04:26
CPC Classifications
H; H04; H04N; H04N5/00; H04N5/76; H04N5/91; H04N5/92; H04N5/921; H04N5/78; H04N5/782; H04N5/7822
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
124 words
A video transducer system comprising a non-rotating magnetic transducer head arranged to scan a moving magnetic record tape in the logitudinal direction for recording a video signal along a logitudinal channel thereof, a video recording circuit for supplying a video signal to be recorded to said magnetic transducer head, and a high frequency bias circuit for generating a megacycle frequency bias signal and for supplying the same to said magnetic transducer head during recording, the video recording circuit including an amplifier means for connection with the sync signal circuits of a television receiver so as to supply an amplified sync signal to the transducer head, said video recording circuit supplying said video signal from the television receiver to the transducer head without further amplification.
Claim 2
Dependent Claim
124 words
A video transducer system comprising a non-rotating magnetic transducer head arranged to scan a moving magnetic record tape in the logitudinal direction for recording a video signal along a logitudinal channel thereof, a video recording circuit for supplying a video signal to be recorded to said magnetic transducer head, and a high frequency bias circuit for generating a megacycle frequency bias signal and for supplying the same to said magnetic transducer head during recording, the video recording circuit including an amplifier means for connection with the sync signal circuits of a television receiver so as to supply an amplified sync signal to the transducer head, said video recording circuit supplying said video signal from the television receiver to the transducer head without further amplification.
Claim 3
Dependent Claim
142 words
A video recording system comprising a source of a composite video signal including successive lines of a picture signal and vertical and horizontal synchronizing signals, a video recording head for coupling to a magnetic record medium, and a video recording circuit connected with said source and with said recording head during recording operation for supplying the successive lines of said picture signal to said recording head for recording on said magnetic record medium, wherein the improvement comprises means connected with said source and with said video recording circuit for adding to the picture signal a separate synchronizing signal including vertical and horizontal synchronizing portions to supply to the video recording head vertical and horizontal synchronizing portions of increased amplitude in comparison to those of said composite video signal, for recording on the record medium between the successive lines of the picture signal.
Claim 4
Dependent Claim
142 words
A video recording system comprising a source of a composite video signal including successive lines of a picture signal and vertical and horizontal synchronizing signals, a video recording head for coupling to a magnetic record medium, and a video recording circuit connected with said source and with said recording head during recording operation for supplying the successive lines of said picture signal to said recording head for recording on said magnetic record medium, wherein the improvement comprises means connected with said source and with said video recording circuit for adding to the picture signal a separate synchronizing signal including vertical and horizontal synchronizing portions to supply to the video recording head vertical and horizontal synchronizing portions of increased amplitude in comparison to those of said composite video signal, for recording on the record medium between the successive lines of the picture signal.
Claim 5
Dependent Claim
126 words
In a video transducer system including a broadcast television receiver having a first circuit point for supplying a video signal and having a second circuit point for supplying vertical and horizontal synchronizing signals, and a video recording head for coupling to a magnetic record medium, a video recording circuit connected with said first circuit point and with said video recording head for supplying said video signal to said head for recording on said magnetic record medium, and circuit means connected with said second circuit point and with said video recording circuit and comprising an inverter for supplying said vertical and horizontal synchronizing signals with inverted polarity to said video recording head for recording on said magnetic record medium on the same channel as said video signal.
Claim 6
Dependent Claim
126 words
In a video transducer system including a broadcast television receiver having a first circuit point for supplying a video signal and having a second circuit point for supplying vertical and horizontal synchronizing signals, and a video recording head for coupling to a magnetic record medium, a video recording circuit connected with said first circuit point and with said video recording head for supplying said video signal to said head for recording on said magnetic record medium, and circuit means connected with said second circuit point and with said video recording circuit and comprising an inverter for supplying said vertical and horizontal synchronizing signals with inverted polarity to said video recording head for recording on said magnetic record medium on the same channel as said video signal.
References Cited (Backward Citations)
US3065296A
Cited
US3342937A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-06-04 | 1976-12-04 | 1977-06-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-04 | 1980-12-04 | 1981-06-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-04 | 1984-12-04 | 1985-06-05 | $7700.00 | Window Closed / Lapsed |