Abstract: A time base corrector for video signal is disclosed in which a phase-locked loop is formed for a chroma carrier of a video signal so that a difficulty in detecting a phase error from a horizontal sync signal at an accuracy similar to the chroma carrier, in the vertical sync section having no chroma carrier and complexity of hardware in which the phase difference between the horizontal sync and chroma carrier should be considered, are overcome by employing a high gain loop filter and a clearing operation. Further, a read clock modulation is performed exactly at a time delayed in a FIFO memory according to a speed error generated in one line, using properties in which frequency variation corresponds to phase integration in one line in the frequency conversion characteristic of the digital timing oscillator. This simplifies the read clock phase modulator.