Speed responsive filtering control system for flaw detection apparatus

A system for processing signals produced by magnetic flaw detection apparatus having facility for examining objects in the course of transport thereof at speeds varying from a prescribed slow speed to a prescribed high speed with transport frequency thereby being within a first frequency range, said system comprising:

• (a) first means for detecting the speed of transport of an object under examination and generating output signals having characteristics indicative of said detected speed and extending over a given characteristic range correspondingly with said first frequency range;
• (b) second means for receiving said first means output signals and transforming the same into a second frequency range substantially expanded as compared to said first frequency range, said second means storing a plurality of band pass filter center frequency selections in said second frequency range correlated with said transport speed indications in said first means output signals and operable for providing control signals indicative of center frequency selections corresponding with said first means output signals;
• (c) variably settable filter means for receiving said signals produced by said magnetic flaw detection apparatus and said second means control signals and responsive to said second means control signals to establish a band pass filter center frequency for processing said signals received from said magnetic flaw detection apparatus and outputting frequency-processed signals;
• and
• (d) third means for receiving said frequency-processed signals produced by said variably settable filter means and said first means output signals and varying the processing in said third means of said frequency-processed signals in accordance with said first means output signals.