Magnetic recording medium processing device

A magnetic recording medium processing device, comprising:

• a loading slot into which a magnetic recording medium on which magnetic information is recorded is loaded;
• a medium movement path extending from the loading slot;
• a first magnetic head arranged in the medium movement path and configured to detect a magnetic signal from the magnetic recording medium;
• a magnetic information reproducer configured to reproduce the magnetic information, based on a signal of a specific frequency included in analog signals output from the first magnetic head;
• an interfering magnetic field generator configured to generate an interfering magnetic field along the medium movement path;
• and
• an interfering magnetic field controller configured to control the interfering magnetic field generator to generate a first interfering magnetic field until the first magnetic head starts detecting the magnetic signal, and control the interfering magnetic field generator to generate a second interfering magnetic field different in frequency spectrum from the first interfering magnetic field while the first magnetic head detects the magnetic signal.