Magnetic video recording apparatus for intermittent recording

Claim 1

A magnetic video recording apparatus for making a magnetic tape intermittently travel by one frame so as to record video signals therein, comprising: a voltage driven capstan motor for enabling said magnetic tape to travel, rotation detecting means mechanically coupled to said capstan motor for providing pulse signals according to the rotation of said capstan motor, recording start instructing means for providing intermittently a recording start signal for instructing the start of recording, and control means comprising: power supply means for providing a driving voltage (V 1 ) of a first polarity in response to said recording start signal, a driving voltage (V 2 ) of a second polarity in response to a first control signal applied thereto, a driving voltage in the form of pulses (V 3 ) of said first polarity in response to a second control signal applied thereto and a driving voltage in the form of pulses (V 4 ) of said second polarity in response to a third control signal applied thereto, timer means for starting measurement of a unit time interval required for recording of said one frame in response to said recording start signal, providing said first control signal when a time interval half as long as said unit time interval has passed, counter means for starting count-up in response to said recording start signal or said second control signal and starting count-down in response to said third control signal, and comparing means for comparing a count number K in said counter means with a predetermined value PV at a lapse of said unit time interval so as to stop application of said first control signal if K=PV, to provide said second control signal if K<PV until the condition K=PV is satisfied and to provide said third control signal if K<PV until the condition K=PV is satisfied, said predetermined value PV being a value corresponding to a travelling distance of said magnetic tape for said one frame.