Antiskid control circuit

Claim 1

An acceleration and deceleration sensor for antiskid devices in vehicles comprising: a voltage generator producing an output voltage proportional to wheel speed and having superimposed thereon interfering upper harmonics of said output voltage; a filter circuit including a first capacitor and a two terminal non-capacitive component, one terminal of said non-capacitive component being directly connected to said generator and said first capacitor being directly connected between the other terminal of said non-capacitive component and a reference voltage; a differentiating circuit including a second capacitor and a resistive component coupled in series with respect to each other and in parallel with respect to said first capacitor to provide across at least a portion of said resistive component acceleration and deceleration signals; and a pair of semi-conductor devices having opposite forward directions directly connected in parallel with respect to each other and said parallel connected devices are directly connected in parallel with only said non-capacitive component; said non-capacitive component having developed thereacross a predetermined forward bias voltage for said pair of devices, each of said devices being rendered conductive when its said predetermined bias voltage is exceeded to conduct said output voltage from said generator to said differentiating circuit without significant time delay and without significant effect on said acceleration and deceleration signals by said intefering harmonics.