| 摘要 |
A laser beam is directed from an optical head (40) while an alternating magnetic field is applied from a magnetic head (52). A reproduced signal from the optical head (40) is input to a reproduced signal detecting circuit (45) through a reproduced signal amplifying circuit (41). The detected signal (CK) of discontinuous regions provided at prescribed intervals in the groove of a magneto-optical recording medium (1) is input to an external synchronous signal generating circuit (46) and, in response, an external synchronous signal (SYN) is generated. In synchronization with the external synchronous signal (SYN), the reproduced signal detecting circuit (45) calculates a difference between the reproduced signal generated when a magnetic field for magnetic domain magnification is applied and the reproduced signal generated when a magnetic field for magnetic domain erasure is applied. The difference is detected as a reproduced signal (RF). Accordingly, low frequency "winding" included in the reproduced signal from the optical head (40) is offset, resulting in a correct reproduced signal (RF).
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