Magnetic video recording and reproducing device

Claim 1

A magnetic recording and reproducing device in which a video signal is recorded intermittently on an oblique magnetic track formed on a magnetic tape by a rotary magnetic head, and reproduced therefrom, said device comprising: a tape driving capstan rotatable for moving the magnetic tape a predetermined constant distance for each rotation thereof; a pulse motor for rotating said capstan; driving means coupled to said motor for rotating said motor; pulse supplying means coupled to said driving means having input pulses applied thereto for supplying to said driving means output pulses corresponding to the number of said input pulses applied to said pulse supplying means for driving said driving means for rotating said motor an amount corresponding to the number of said input pulses, wherein the number of said input pulses corresponding to the number of said output pulses for driving said driving means to rotate said motor by an amount corresponding to one track of said video signal is a predetermined constant α, and the number of said input pulses for rotation of said motor by an amount corresponding to 1/β of one track of said video signal is a predetermined constant α/β, where α is a positive integer other than a prime number and β is a positive integer other than 1; a first pulse generating means for generating input pulses to be applied to said pulse supplying means; a first gating means connected between said first pulse generating means and said pulse supplying means for gating said input pulses to said pulse supplying means; pulse counting means coupled to said first pulse generating means and said first gating means and including a first pulse counter for counting said input pulses for producing one pulse every time said first pulse counter counts α/β pulses, and a second pulse counter coupled to said first pulse counter for receiving pulses produced from said first pulse counter and for counting the received pulses to produce one pulse after said second pulse counter counts β pulses, and selecting means coupled to said pulse counting means and to said first gating means for manually selecting the operation of said pulse counting means for opening said first gating means only during a time α/β number of said input pulses are counted by said first pulse counter so as to apply only α/β number of said input pulses to said pulse supplying means, or opening said first gating means only during a time β number of the pulses from said first pulse counter are counted by said pulse counter so as to apply only α number of said input pulses to said pulse supplying means.