Magnetic head apparatus.

摘要

A magnetic recording head apparatus includes: a magnetic head body (10) opposing a travelling magnetic tape (12); a tuning circuit (29) having the head body (10) as a variable inductance element; a high-frequency signal source (20) for generating a high-frequency signal (46); and a detector (30) connected to the tuning circuit (29). The inductance of the head body (10) is changed in accordance with a change in the magnetic signal field applied from the magnetic tape (12). The high-frequency signal (46) is amplitude-modulated in accordance with the high-frequency signal (46). A peak or envelope waveform of the modulated high-frequency signal is detected by a detector, thereby obtaining a reproduced information signal.