Abstract: This circuit includes an arrangement which modulates the horizontal velocity of the spot as a function of the video contents with the aid of a supplementary horizontal deflection coil. This arrangement essentially includes a video signal differentiator followed by an amplifier which supplies a current to the supplementary deflection coil. The current generated by the amplifier has a threshold (S) for the input signal, and a quasi-plateau for input signals beyond 25%. The difference between this current and the current which would be generated by a linear amplifier (broken-line curve) is concerned in this case. This difference, for example for an input voltage of 50%, is referred to as reserve (R). A trap filter is inserted upstream of the amplifier in the arrangement, which filter is centered on the chrominance subcarrier frequency and has a depth which is equal to about the value of the reserve.