DIGITAL PHASE CONTROLLER

摘要

PURPOSE:To cause virtually no increase of the cost with a digital phase controller and yet to improves the function of said controller, by setting optionally the shift degree of the X value with no limit and minimizing the designed additional amount of said shift degree in a consecutive video recording mode where the shift degree of the X value can be corrected. CONSTITUTION:A phase discriminator 2 for comparison of capstan phase has the basically same actuation as that of a phase discriminator 1 for comparison of cylinder phase in a standby mode. Then the signal supplied to a preset generating circuit 12 as a reference signal serves as an output 20 of a preset generating circuit 7 of the discriminator 1. Therefore the X value shift time is never limited with the preset value NPA for comparison of capstan phase even if the trapezoidal wave position is fixed.