| 摘要 |
<P>PROBLEM TO BE SOLVED: To accurately generate wobbling signals in an information recording medium, which are FSK modulated, PSK modulated or their combined FSK+PSK modulated. <P>SOLUTION: A plurality of signals which have frequencies different from each other or whose phases are reverse to each other in the same frequency are generated at f1 and f2 signal based SIN wave generation circuits 203 and 204 and reversing circuits 205 and 206. The plurality of generated signals are switched and selectively outputted by selection circuits 207 to 209 by using first to third information signals to generate the wobbling signals, which are outputted to a laser modulator 211 and a motor control circuit 215. <P>COPYRIGHT: (C)2005,JPO&NCIPI |
