Magnetic signal detector

Abstract From the Canadian patent

A circuit is disclosed for monitoring the output voltage of a magnetic pickup and for producing output signals representing the valid detection of bars of magnetized ink moved past the pickup. The circuit is capable of detecting and providing correct output data from input signals ranging from relatively weak signals of low amplitude to relatively strong signals which are of high amplitude and include overshoot pulses of substantial amplitude. The circuit is disclosed in association with a system for sorting envelopes containing inserts coded with bars of magnetic ink, the output of the signal detecting circuit being used as the input to a sorter logic controlling a sorter mechanism.