| 摘要 |
<P>PROBLEM TO BE SOLVED: To solve a problem associated with the fact that there is no quantitative measuring method of interlayer crosstalk caused by unnecessary light in a multilayer optical recording medium having three or more recording layers. <P>SOLUTION: Regarding a signal recorded with a first frequency in a recording area on a specific first recording layer and a signal recorded with a second frequency different from the first frequency in a recording area on a second recording layer which might cause interlayer crosstalk in relation to the first recording layer, a reproducing signal measurement method for the multilayer optical recording medium having three or more recording layers includes reproducing the signal recorded in the recording area on the first recording layer, separating signals recorded respectively with the first and second frequencies, discriminating signal amplitude of the first frequency and a maximum value in signal amplitude of the second frequency, and calculating a signal amplitude ratio between them to measure interlayer crosstalk contained in the signal reproduced from the recording area on the first recording layer. Thus, the interlayer crosstalk caused by unnecessary light can be measured quantitatively. <P>COPYRIGHT: (C)2009,JPO&INPIT |
