Single field video recording system and method

Claim 2

In a single field video recording system of a type employing a magnetic transducer element and a rotating record disc disposed in recording relation thereto for recording signals from a source of composite video signals of a type containing synchronizing timing signals occurring at regular intervals to define a field of video signals therebetween, means forming an erase pulse coupled to said transducer for a predetermined period of time in excess of the period of one revolution of said disc and serving to erase said disc throughout a closed circular path thereof, means deriving a control signal from a portion of said erase pulse, gating control means disposed to sense said timing signals and said control signal and serving to gate composite video signals from said source to said transducer element for recording upon said disc in said path in response to sensing of the first and said timing signals occurring after termination of said erase pulse and serving to inhibit said gating in response to sensing a second of said timing signals.

Claim 3

A single field video recording system according to claim 1 wherein said second timing signal occurs as the next succeeding timing signal following said first timing signal whereby to limit the period of recording to a single video field.

Claim 4

A single field video recording system according to claim 1 of a type having video playback circuits to reproduce recorded signals from said disc via said transducer element comprising switch means for coupling and decoupling said playback circuits from said transducer element, said switch means being operatively coupled to the first named said means and responsive thereto to decouple said playback circuits from said transducer element in response to initiation of said erase pulse, said switch means being further operatively coupled to said gating control means for recoupling said transducer element to said playback circuits in response to said second timing signal.

Claim 5

A single field video recording system of a type employing a magnetic transducer element and a cyclically moving record medium disposed in recording relation thereto for recording from a source of composite video signals of a type containing synchronizing timing signals therein, means forming an erase pulse coupled to said transducer for erasing said medium along the entire length of a track thereof, means serving to derive a control signal from a portion of said erase pulse, means serving to gate composite video signals from said source to said transducer under the control of both said control signal and a first synchronizing timing signal of the composite video signal, the last named means serving to inhibit the gating of said composite video signal to said transducer in response to receipt thereof of a second synchronizing timing signal.

Claim 6

A single field video recording system of a type employing a magnetic transducer element and a cyclically moving record medium disposed in recording relation thereto for recording from a source of composite video signals of a type containing synchronizing timing signals therein, means forming an erase pulse coupled to said transducer for erasing said medium along the entire length of a track thereof, means serving to derive a control signal from a portion of said erase pulse, means serving to gate composite video signals from said source to said transducer under the control of both said control signal and a first synchronizing timing signal of the composite video signal, the last named means serving to inhibit the gating of said composite video signal to said transducer in response to receipt thereof of a second synchronizing timing signal.

Claim 11

A single field video recording system of a type employing a magnetic transducer element and a cyclically moving record medium disposed in recording relation thereto for recording from a source of composite video signals of a type containing synchronizing timing signals therein, means including a modulator for coupling said source to said transducer for recording upon said medium, means forming an erase pulse coupled to said transducer for erasing said medium along the length of a track thereof, means serving to derive a control signal from a portion of said erase pulse, means for deriving a stream of said timing signals from said source, means including a latch circuit disposed to be set and reset respectively by said control signal and a first one of said timing signals, and a bi-stable switch means having two inputs coupled to said latch to receive the output states thereof, said switch means having output states respectively related to the input states thereof and means disposed to respond to one of said timing signals to switch the input states of said switch means to said outputs and to retain the last named condition until said switch means is reset by the next occurring timing signal received by said switch means, the output of said bi-stable switch means serving to operate said modulator to couple and decouple said source to said transducer as it is switched from one state to the other.

Claim 12

A single field video recording system of a type employing a magnetic transducer element and a cyclically moving record medium disposed in recording relation thereto for recording from a source of composite video signals of a type containing synchronizing timing signals therein, means including a modulator for coupling said source to said transducer for recording upon said medium, means forming an erase pulse coupled to said transducer for erasing said medium along the length of a track thereof, means serving to derive a control signal from a portion of said erase pulse, means for deriving a stream of said timing signals from said source, means including a latch circuit disposed to be set and reset respectively by said control signal and a first one of said timing signals, and a bi-stable switch means having two inputs coupled to said latch to receive the output states thereof, said switch means having output states respectively related to the input states thereof and means disposed to respond to one of said timing signals to switch the input states of said switch means to said outputs and to retain the last named condition until said switch means is reset by the next occurring timing signal received by said switch means, the output of said bi-stable switch means serving to operate said modulator to couple and decouple said source to said transducer as it is switched from one state to the other.

Claim 13

A single field recording system according to claim 7 further including a step pulse generator serving to set said latch circuit and to step said transducer from track to track at a rate related to the rate of setting said latch and recording said fields.

Claim 16

The method of recording a single isolated field of video information according to claim 9 wherein the terminating step comprises terminating the last named step in response to the next occurring of said timing signals to again inhibit passage of said stream to said transducer.