löschkopf from a permanentmagnetischen material and magnetisierungsvorrichtung with a bewickelten core with polstücken from hochpermeablem material to a löschkopfes dauermagnetisierung

摘要

PURPOSE:To improve S/N ratios by so magnetizing that the magnetization curve of a magnetic tape shows zero erasing as an erase head of varying polarities and varying magnetic field intensitites.