US3946147A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic recording system
Assignee: IIT Research Institute
•
Filing: 1975-03-26
•
Granted: 1976-03-23
•
Expires: 1995-03-26
Abstract
Abstract A longitudinal scan transducing apparatus for use with a television receiver comprising a magnetic transducer head having transverse conductors for supplying high frequency bias, high frequency bias synchronized with the horizontal line rate, head shifting and tape reversal features, and television set adapter circuitry for supplying a wide-band video signal and for stabilizing reproduced sync signals.
Inventors
- 👤 Marvin Camras
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 06:52
CPC Classifications
H; H04; H04N; H04N5/00; H04N5/76; H04N5/91; H04N5/92; H04N5/921; H04N5/765; H04N5/775
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
130 words
In a video transducer system comprising a magnetic transducer head for scanning cooperation with a magnetic record medium, a video recording circuit connected with said transducer head during recording operation for supplying a video signal to be recorded to said transducer head and for producing a video signal magnetic field acting on the record medium to record the video signal thereon, and a high frequency bias circuit connected with said transducer head during recording operation for producing a high frequency bias magnetic field which is superimposed on the video signal magnetic field to assist in the recording of the video signal, wherein the improvement comprises means determining the bias frequency of said high frequency bias magnetic field so as to avoid beat notes with frequency components of the video signal.
Claim 2
Dependent Claim
130 words
In a video transducer system comprising a magnetic transducer head for scanning cooperation with a magnetic record medium, a video recording circuit connected with said transducer head during recording operation for supplying a video signal to be recorded to said transducer head and for producing a video signal magnetic field acting on the record medium to record the video signal thereon, and a high frequency bias circuit connected with said transducer head during recording operation for producing a high frequency bias magnetic field which is superimposed on the video signal magnetic field to assist in the recording of the video signal, wherein the improvement comprises means determining the bias frequency of said high frequency bias magnetic field so as to avoid beat notes with frequency components of the video signal.
Claim 3
Dependent Claim
42 words
A system according to claim 1 wherein the video recording circuit supplies a video signal having a given horizontal line frequency, and said determining means produces a bias frequency equal to a multiple of the horizontal line frequency of the video signal.
Claim 4
Dependent Claim
28 words
A system according to claim 2 wherein said determining means produces a bias frequency equal to a multiple of the order of 200 times said horizontal line frequency.
Claim 5
Dependent Claim
64 words
A system according to claim 2 wherein a video color signal source includes a horizontal deflection signal, and said determining means comprises a frequency multiplier connected to said source for receiving said horizontal deflection signal and connected to said transduced head for supplying a high frequency bias signal thereto with a frequency equal to a multiple of the frequency of said horizontal deflection signal.
Claim 6
Dependent Claim
103 words
A video transducer system comprising a magnetic transducer head arranged to scan a moving magnetic record tape for recording a video signal along a longitudinal 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, said video recording circuit providing a bias frequency value of from 2 to 8 megacycles per second avoiding beat notes with the video signal, and superimposed on the video signal to assist recording thereof.
Claim 7
Dependent Claim
103 words
A video transducer system comprising a magnetic transducer head arranged to scan a moving magnetic record tape for recording a video signal along a longitudinal 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, said video recording circuit providing a bias frequency value of from 2 to 8 megacycles per second avoiding beat notes with the video signal, and superimposed on the video signal to assist recording thereof.
Claim 8
Dependent Claim
126 words
A television recording system comprising circuit means for receiving video signal information together with audio signal information with the video signal information including a synchronizing signal at a horizontal line frequency, audio and video signal recording means for recording the audio and video signal information and coupled to said circuit means for receiving said audio and video signal information therefrom, and means coupled to said audio and video signal recording means and to said receiving means for generating a high frequency bias signal having a frequency synchronized with the frequency of said synchronizing signal for producing a bias frequency field component at said recording means which is mixed with a signal field generated by said recording means to assist in the recording of the signal information.
Claim 9
Dependent Claim
126 words
A television recording system comprising circuit means for receiving video signal information together with audio signal information with the video signal information including a synchronizing signal at a horizontal line frequency, audio and video signal recording means for recording the audio and video signal information and coupled to said circuit means for receiving said audio and video signal information therefrom, and means coupled to said audio and video signal recording means and to said receiving means for generating a high frequency bias signal having a frequency synchronized with the frequency of said synchronizing signal for producing a bias frequency field component at said recording means which is mixed with a signal field generated by said recording means to assist in the recording of the signal information.
References Cited (Backward Citations)
US3502795A
Cited
US3526727A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-03-23 | 1979-09-22 | 1980-03-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-03-23 | 1983-09-22 | 1984-03-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-03-23 | 1987-09-22 | 1988-03-23 | $7700.00 | Window Closed / Lapsed |