Apparatus for correcting recording distortion

Claim 1

APPARATUS FOR RECORDING ON MAGNETIC TAPE INCLUDING IN COMBINATION A MAGNETIC RECORDING HEAD TO WHICH SIGNALS FOR RECORDING ARE FED, A SECOND MAGNETIC HEAD POSITIONED OPPOSITE SAID RECORDING HEAD FOR PASSAGE OF MAGNETIC TAPE THEREBETWEEN, EACH OF SAID HEADS COMPRISING AT LEAST ONE MAGNETIC CIRCUIT AND HAVING A SINGLE GAP, THE GAPS OF SAID HEADS BEING PRECISELY ALIGNED WITH EACH OTHER ON OPPOISTE SIDES OF THE TAPE, MEANS ASSOCIATED WITH SAID SECOND HEAD FOR PRODUCING FEEDBACK SIGNALS HAVING DISTORTION CHARCTERISTICS DERIVED FROM SIGNALS INDUCED IN SAID SECOND HEAD RESPONSIVE TO THE RECORDING PROCESS, SAID MEANS FOR PRODUCING SAID FEEDBACK SIGNALS INCLUDING MEANS FOR COMPARING SAID DERIVING, FROM SIGNALS FROM SAID SECOND MAGNETIC HEAD AND RECORDING SIGNALS TO BE APPLIED TO SAID RECORDING HEAD, DIFFERENCE SIGNALS HAVING DISTORTION CHARACTERISTICS CORRESPONDING WITH THE DISTORTION DUE TO THE RECORDING PROCESS AND CONSTITUTING SAID FEEDBACK SIGNALS, AND MEANS FOR APPLYING SAID FEEDBACK SIGNALS TO SAID RECORDING HEAD, WHEREBY TO CORRECT RECORDING DISTORTION.