Compensating circuit arrangement in a wheel anti-skid brake control system to obtain corresponding measured values of the duration of the half cycle alternations of a wheel generated voltage

In an anti-skid brake control system for a wheeled vehicle, an electronic circuit for generating a wheel speed signal in accordance with the time duration of a half cycle of a sinusoidal waveform whose positive and negative alternations are provided by a sensor that detects the presence or absence of a tooth of a rotor that revolves with a wheel of the vehicle, said electronic circuit comprising:

• (a) timing means subject to said sinusoidal waveform for providing a time signal representative of the time duration of a respective one of said positive and negative alternations of said sinusoidal waveform;
• (b) comparator means for detecting a difference between said time signal of a positive alternation and said time signal of a negative alternation of said sinusoidal waveform;
• and
• (c) compensating means for regulating said timing means so as to modify said time signal corresponding to one of said positive and negative alternations of said sinusoidal waveform when said comparator means detects a difference therebetween, whereby said wheel speed signal generated during a positive half cycle and a negative half cycle of said sinusoidal waveform are in correspondence for any given velocity of wheel rotation.