Patent US3813484A successfully refreshed from Google Patents.
US3813484A
Expired / Lapsed
US
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Magnetic tape reproducing system for stop motion video with audio
Assignee: Panasonic Holdings Corp
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Filing: 1973-03-22
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Granted: 1974-05-28
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Expires: 1993-03-22
Abstract
Abstract An apparatus for reproducing a video signal for successive still pictures and a corresponding audio signal, which are recorded on the longitudinal tracks on magnetic tape respectively. The apparatus has rotary magnetic heads for reproducing the video signal and a stationary magnetic head for reproducing the audio signal. The output signals from a plurality of the rotary magnetic heads are gated respectively by respective gate circuits so as to provide the same field of the video signal, and the gated signals are mixed additively by a mixer, so that the same field is reproduced repeatedly and a still picture is displayed on a color TV receiver. The gate circuits are controlled by the vertical synchronizing signal contained in the field of the video signal for each picture and by the control signal provided from a detector for detecting the phase of the rotary magnetic heads, and these signals are provided to the gate circuits through a ring counter, and further these signals are suitably delayed for controlling the gating action so as to reproduce a still picture and to change continuously to reproduce subsequent still pictures.
Inventors
- 👤 M Mino
- 👤 K Fujisawa
- 👤 K Ianabe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 10:20
CPC Classifications
G; G11; G11B; G11B15/00; G11B15/02; G11B15/12; G11B15/14; H; H04; H04N; H04N5/00; H04N5/76; H04N5/78; H04N5/782; H04N5/783
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
391 words
An apparatus for reproducing a video signal for a plurality of successive still pictures and a corresponding audio signal, comprising a magnetic tape having first and second longitudinal tracks thereon, said video signal for the plurality of still pictures including a vertical synchronizing signal in the field of each of the successive pictures and being recorded on said first track of said magnetic tape and said audio signal being recorded on said second track of said magnetic tape, tape moving means for moving said magnetic tape, a stationary magnetic transducer along the path of said tape over which the tape runs for reproducing said audio signal recorded on said second longitudinal track of said magnetic tape, magnetic transducing means for reproducing said video signal recorded on said first track, said magnetic transducing means comprising a rotating drum and a plurality of rotary magnetic heads which are arranged on the inner periphery of said rotative drum at positions equally spaced from each other, said magnetic tape being wound around said drum along a portion of the length of the periphery at least equal to the length of two successive fields of said video signal on said first track and the distance between two adjacent rotary magnetic heads being nearly equal to the length of the magnetic tape corresponding to one field of said video signal, sigNal processing means coupled to said plurality of rotary magnetic heads for gating the respective video signals reproduced by said plurality of rotary magnetic heads, mixing means connected to said signal processing means for mixing additively the gated signals from said signal processing means, separating means connected to said mixing means for separating said vertical synchronizing signal from the video signal from said mixing means, detecting means coupled to said rotating drum for generating a control signal corresponding to the rotating phase of said rotative drum, and control means coupled to said separating means and said detecting means and driven by the vertical synchronizing signal from said detecting means for providing a gating signal and being coupled to said signal processing means for supplying said gating signal thereto for gating, respectively, the video signal of a complete field between the two adjacent vertical synchronizing signals for each of said plurality of rotary magnetic heads, successively in the order of rotation of said plurality of rotary magnetic heads.
Claim 2
Independent Claim
391 words
An apparatus for reproducing a video signal for a plurality of successive still pictures and a corresponding audio signal, comprising a magnetic tape having first and second longitudinal tracks thereon, said video signal for the plurality of still pictures including a vertical synchronizing signal in the field of each of the successive pictures and being recorded on said first track of said magnetic tape and said audio signal being recorded on said second track of said magnetic tape, tape moving means for moving said magnetic tape, a stationary magnetic transducer along the path of said tape over which the tape runs for reproducing said audio signal recorded on said second longitudinal track of said magnetic tape, magnetic transducing means for reproducing said video signal recorded on said first track, said magnetic transducing means comprising a rotating drum and a plurality of rotary magnetic heads which are arranged on the inner periphery of said rotative drum at positions equally spaced from each other, said magnetic tape being wound around said drum along a portion of the length of the periphery at least equal to the length of two successive fields of said video signal on said first track and the distance between two adjacent rotary magnetic heads being nearly equal to the length of the magnetic tape corresponding to one field of said video signal, sigNal processing means coupled to said plurality of rotary magnetic heads for gating the respective video signals reproduced by said plurality of rotary magnetic heads, mixing means connected to said signal processing means for mixing additively the gated signals from said signal processing means, separating means connected to said mixing means for separating said vertical synchronizing signal from the video signal from said mixing means, detecting means coupled to said rotating drum for generating a control signal corresponding to the rotating phase of said rotative drum, and control means coupled to said separating means and said detecting means and driven by the vertical synchronizing signal from said detecting means for providing a gating signal and being coupled to said signal processing means for supplying said gating signal thereto for gating, respectively, the video signal of a complete field between the two adjacent vertical synchronizing signals for each of said plurality of rotary magnetic heads, successively in the order of rotation of said plurality of rotary magnetic heads.
Claim 3
Dependent Claim
84 words
An apparatus according to claim 1 wherein said control means comprises a ring counter having a plurality of flip-flop circuits equal in number to the number of said rotary magnetic heads, said ring counter being for counting said vertical synchronizing signals so as to gate respectively said video signal for a complete field successively in the order of rotation of said plurality of rotary magnetic heads, and being reset by said control signal so as to change the gating order of said video signals.
Claim 4
Dependent Claim
16 words
An apparatus according to claim 1, wherein said magnetic transducing means has three rotary magnetic heads.
Claim 5
Dependent Claim
57 words
An apparatus according to claim 1, wherein said separating means includes a delaying means for delaying said vertical synchronizing signal, the delay time of said delaying means being adjustable, whereby by adjusting the delay time of said delaying means the phase of said gating signal is changed with respect to the phase of said vertical synchronizing signal.
Claim 6
Dependent Claim
56 words
An apparatus according to claim 1, wherein said detecting means includes a delaying means for delaying said control signal, the delay time of said delaying means being adjustable, whereby by adjusting the delay time of said second delaying means the phase of said gating signal is changed with respect to the phase of said control signal.
Claim 7
Dependent Claim
67 words
An apparatus according to claim 1, wherein the distance between two adjacent rotary magnetic heads of said plurality of rotary magnetic heads on the periphery of said rotative drum is at the most equal to the length of said magnetic tape corresponding to one field of said video signal so as to prevent the presence of an unwanted signal in the field of the reproduced video signal.
Claim 8
Dependent Claim
41 words
An apparatus according to claim 1, wherein said tape moving means includes a speed control means for controlling the speed of movement of the tape so as to change the time for which one of the successive still pictures is reproduced.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-05-27 | 1977-11-26 | 1978-05-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-05-27 | 1981-11-26 | 1982-05-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-05-27 | 1985-11-26 | 1986-05-28 | $7700.00 | Window Closed / Lapsed |