A video signal processing apparatus incorporates a 1 H or 2H (H: horizontal synchronization period) delay circuit (3). The output of the delay circuit (3) is fed back to the input thereof so as to average the noise, thus raising the signal S/N ratio. The feedback line includes a nonlinear processing circuit (8) with a small gain when the signal input has a low vertical correlation, whereby the signal S/N ratio is improved without causing delay of the colour signal in the vertical direction nor deterioration of resolution of the luminance signal.