| 摘要 |
In a signal reproducing apparatus, information is reproduced by moving a magnetic wall on a magnetic recording medium as follows. A temperature profiled is given the medium by using a light beam so as to detect a first reproduction signal h(t)=f(t)+ alpha *f(t- beta ) containing both a signal component f(t) obtained by a first backward magnetic wall movement toward a temperature peak position in the temperature profile and a signal component alpha *f(t- beta ) obtained by a second forward magnetic wall movement toward the temperature peak position. The power of the light beam is adjusted so that a delay amount beta is essentially an integer multiple of a recording code channel interval Tb. An amplitude ratio alpha is detected. A slice level is set in accordance with the detected amplitude ratio alpha so as to reproduce the information by comparing the first reproduction signal with the slice level.
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