| 摘要 |
PURPOSE:To obtain a high quality reproduced signal output by setting the intensity of light for recording emitted from plural light sources to a value in which an non-linear component of cross talk developed on each signal multiply recorded becomes the minimum. CONSTITUTION:In a circuit provided with subtracters 603, 703, 604, 704, and a multiplier 800, output current from a photo detector 65 and 75 are converted by IV (601, 701), a DC component of output voltage is eliminated by passing through filters 602 and 702, and a linear component of cross talk is eliminated by subtracters 603 and 703. Next, the product of an output after reduction of the linear component, that is, a non-linear component is made by a multiplier 800, and subtraction of the non-linear component of cross talk is performed by subtracting the non-linear component of cross talk again from the signal from which the linear component is reduced by using subtracters 604 and 704. And a high quality reproduced signal is obtained by performing arithmetic processing for reducing cross talk in detected signals of these multiple signals in reproducing. |
