Device for measuring the speed of movement of a vehicle

摘要

The present invention relates to devices for measuring the speed of movement of a vehicle and frequency multiplier circuits. In order to correct the frequency of the signal coming from a detector sensitive to the rotation of a motive unit of a vehicle, the invention provides a frequency multiplier circuit comprising a counter 40 and a storage unit 60 determining the number of periods of a timing signal FH/K contained in one validation period M/FE linked to the input signal, as well as a comparator 100 comparing the contents of the storage unit 60 and of a second comparator 80 incremented by a clock signal FH. <IMAGE>