抄録
To obtain stable reproduced output on a VTR, it is necessary to analyze the causes of output fluctuation in spacing or off-tracking and study them quantitatively. We have developed a method for such quantitative measurement in which two frequency-time division signals are recorded and the ratios between the reproduced output at each wavelength and the peak output are plotted in 2-D. Using this method, we conducted an experiment and the results confirmed its validity in measuring off-track and spacing fluctuation. In addition, it was confirmed that the time division method is superior to the frequency multiple method on using two-frequency signals. Furthermore, it was demonstrated that fluctuations can be measured even in ultra-narrow-track recording by carrying out off-track correction that takes into account the recording/reproduction crosstalk.
