Time base correcting system

Abstract

A system for correcting the time base in a fixed type magnetic recording and reproducing apparatus is disclosed. The system involves picking up video signals with a fixed head, reproducing the video signals with a demodulator, correcting time base variations of the reproduced video signals with a variable delay member, comparing the output signals of the variable delay member with reference signals in order to detect the time base variations caused in the reproduced video signals by the tape running irregularly and the time base variations caused by a change with time or the like in output signals of the variable delay member, feeding back the obtained time base variation signals to the variable delay member through a low-phase filter and a mixer thereby to control the delay member, comparing the phase of input signals to the variable delay member with the phase of the reference signals in order to correct high frequency components of the time base variations which are removed by the low-pass filter, and supplying the obtained time base variation signals to the variable delay member through a high-pass filter thereby to control the delay member.

Dependencies are inferred from the claim text.