| 摘要 |
A method and apparatus for detecting pulse signals corresponding to marks from a recording medium on which the marks are periodically recorded. The recording medium is scanned with a reproducing transducer and a reproduction signal (including the pulse signals) is read out. A gate signal with a predetermined width is generated on the basis of the pulse signal which has been detected at k period before the pulse signal to be detected, where k is an integer more than 1. If the pulse signal before k period is missing, the gate signal with a predetermined width is generated on the basis of the pulse signal which has been detected at k+1 period before. Only the pulse signal existing within the period during which the gate signal is output is extracted from the reproduction signal.
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