Video memory device

Claim 1

A video memory device comprising: an analog memory part in which memory elements are arranged in a matrix form with a plurality of rows and a plurality of columns for storing an input analog video signal including a time base fluctuation component, the memory elements of said analog memory part comprising transfer elements for simultaneously transferring signals in each column to a succeeding row in parallel for each of the rows; an input circuit for applying the input analog video signal to the analog memory part and for causing the analog memory part to store the input analog video signal, said input circuit comprising an input shift register for simultaneously transferring signals in each column to said analog memory part in parallel after serially transferring the input analog video signal for each of said columns; an output circuit for obtaining an analog video signal delayed by a predetermined delay time from said analog memory part, said output circuit comprising an output shift register for serially transferring signals in each column transferred in parallel from said analog memory part and producing the analog video signal delayed by said predetermined delay time; a clock pulse generator for generating and applying a clock pulse for horizontal transfer to said input shift register and said output shift register, and for generating and applying a clock pulse for vertical transfer to said analog memory part; and a phase locked loop including separating means for separating a horizontal synchronizing signal from said input analog video signal, a phase comparator supplied with the separated horizontal synchronizing signal, and a voltage controlled oscillator variably controlled of its oscillation frequency by an output error signal of said phase comparator for supplying an oscillation output to said phase comparator, said output of said voltage controlled oscillator being also supplied to said clock pulse generator to cause said clock pulse generator to generate said clock pulses.