Method for the counting of vehicles the speed of which either exceeds or falls short of a predetermined value

Claim 1

APPARATUS FOR THE COUNTING OF VEHICLES, THE SPEED OF WHICH EITHER EXCEEDS OR FALLS SHORT OF A PREDETERMINED VALUE, COMPRISING: A SOURCE OF VEHICULAR PULSES, ONE PULSE FOR EVERY VEHICLE PASSING THROUGH A RADAR OR ULTRASONIC BEAM; MEANS RESPONSIVE THE DOPPLER FREQUENCY OF SAID PULSES INCLUDING, A FIRST PULSE SHAPER TO CONVERT THE DOPPLER FREQUENCY INTO A TRAIN OF DISCRETE RECTANGULAR PULSES WITH A DEFINED AMPLITUDE, FILTER MEANS COUPLED BETWEEN SAID FIRST SHAPER AND AN AMPLITUDE THRESHOLD DEVICE WHICH PERMITS THE PASSAGE OF SAID RECTANGULAR PULSES LYING BELOW A PREDETERMINED LIMIT FREQUENCY, FIRST TIMING CIRCUIT MEANS FOR CONVERTING SAID RECTANGULAR PULSES INTO A CONTINUOUS PULSE WHICH IS APPLIED TO AN INVERTER, AND A GATING CIRCUIT COUPLED TO THE OUTPUT OF SAID INVERTER, WHEREBY SAID GATING CIRCUIT IS BLOCKED FOR THE TIME OF SAID CONTINUOUS PULSES; SECOND TIMING CIRCUIT MEANS RESPONSIVE TO SAID VEHICULAR PULSES WHICH, AFTER A CERTAIN DELAY PERIOD TRANSFERS SAID PULSES TO A SECOND PULSE SHAPER, SAID SECOND PULSE SHAPER COUPLED TO A SUBSEQUENTLY ARRANGED DIFFERENTIATING CIRCUIT AND SAID GATING CIRCUIT; A THIRD PULSE SHAPER COUPLED TO SAID DIFFERENTIATING CIRCUIT FOR PRODUCING THE COUNTING PULSE OUTPUT; AND A FOURTH PULSE SHAPER COUPLED TO SAID GATING CIRCUIT, TO PRODUCE SPEED PULSES, WHEREBY VEHICULAR PULSES CAN ONLY PASS THROUGH SAID GATING CIRCUIT TO PRODUCE SAID SPEED PULSES IF SAID DOPPLER FREQUENCY IS HIGHER THAN SAID LIMIT FREQUENCY.