Servo control method in the absence of tape control signals

摘要

A servo control method in the absence control signals is comprised of a compare routine (L1) and a non-signal phase control routine (L2). The compare routine (L1) is carried out in such a manner that an envelope value detected by controlling a capstan motor is compared with a predetermined value, when the control pulse is not detected. The non-signal phase control routine (L2) is carried out in such a manner that the phase of the capstan motor is adjusted until a desirable state of video signals arrives by making a dummy phase error section generate a dummy phase error signal when the detected envelope value is smaller than the predetermined value. According to the present invention, a normal picture can be maintained even when no control signals are detected from the tape.