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US 4,396,961 AGranted
Video recorder controller apparatus and method
OwnerD. K. Guru Prasad, James D. Croasmuninventors
Life of this patent
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Abstract
A video recorder for electronic radiography has timing circuits for anticipating an upcoming change in track thereby minimizing the tearing of a single image frame.
Claims8
A video recorder controller comprising:
- (a) controller means for generating a track increment command signal;
- (b) driver means for driving a read/write transducer a pre-determined distance in a forward direction upon receipt of a forward command signal and for driving the read/write transducer a pre-determined distance in a reverse direction upon receipt of a reverse command signal;
- and
- (c) anticipatory timer means for delivering to said driver means said forward command signal a first pre-determined amount of time after receipt of said track increment command signal when a forward track increment is to be made, and for delivering to said driver means said reverse command signal a second pre-determined amount of time after receipt of said track increment command signal when a reverse track increment is to be made, said first and said second pre-determined amounts of times being independent.
1 more element
A controller for a video recorder comprising:
- (a) counter means for counting video pictures and for providing an output signal after a pre-determined number of video pictures are received;
- (b) controller means connected to said counter means for causing one of the video pictures to transfer to or from said memory recorder after detection of said output signal, and for generating a track increment command signal;
- (c) driver means for driving a read/write transducer a pre-determined distance in a forward direction upon receipt of a forward command signal and for driving said read-write transducer a pre-determined distance in a reverse direction upon receipt of a reverse command signal;
- (d) anticipatory timer means for delivering to said driver means said forward command signal a first pre-determined amount of time after receipt of said track increment command signal when a forward track increment is to be made, and for delivering to said driver means said reverse command signal a second pre-determined amount of time after receipt of said track increment command signal when a reverse track increment is to be made, said first and said second pre-determined amounts of times being independent;
- and
- (e) directional means for commanding whether a track increment is to be in a forward or a reverse direction.
3 more elements
A method of controlling a video recorder comprising the steps of:
- (a) generating a track increment command signal;
- (b) delivering to a driver means a forward command signal a first pre-determined amount of time after receipt of said track increment command signal when a forward track increment is to be made, or delivering to said driver means a reverse command signal a second pre-determined amount of time after receipt of said track increment command signal when a reverse track increment is to be made, said first and said second pre-determined amounts of times being independent;
- and
- (c) driving a read/write transducer a pre-determined distance in a forward direction upon receipt of the forward command signal or driving the read/write transducer a pre-determined distance in a reverse direction upon receipt of the reverse command signal.
1 more element
A method of controlling video recorder comprising the steps of:
- (a) counting video pictures and providing an output signal after having counted a pre-determined number of video pictures;
- (b) transferring one of the video pictures to or from the memory of a video storage unit after detection of said output signal, and generating a track increment command signal;
- (c) delivering to a driver means a forward command signal a first pre-determined amount of time after receipt of said track increment command signal when a forward track increment is to be made, or delivering to said driver means a reverse command signal a second pre-determined amount of time after receipt of said track increment command signal when a reverse track increment is to be made, said first and said second pre-determined amounts of times being independent;
- and
- (d) driving a read/write transducer a pre-determined distance in a forward direction upon receipt of a forward command signal and for driving said read/write transducer a pre-determined distance in a reverse direction upon receipt of a reverse command signal.
2 more elements
Dependencies are inferred from the claim text.