PHASE CONTROL OF MOTOR FOR VIDEO RECORDER

1. A method for the phase control of a head drum motor in a video recorder during the reproduction of video signals recorded on a magnetic tape using a phase comparison between the head-switching pulses and the synchronizing pulses recorded on the magnetic tape, the desired phase position of the motor being adjustable, and with a device for measuring the instantaneous deviation from the desired phase position by counting clock pulses, which are fed to a counter, between the head-switching pulse and the synchronizing pulse, characterised in that a control signal R for the head drum motor is derived from the difference between the number of actual pulses I which have entered the counter and the number of preset desired pulses S, wherein R = (I-S), if a) (I-S) is positive and less than +N/2 or b) (I-S) is negative and greater than -N/2 R = (I-S)+N, if (I-S) is negative and less than -N/2 R = (I-S)-N, if (I-S) is positive and greater than +N/2, wherein N corresponds to the number of clock pulses for one revolution of the head drum motor.