| 摘要 |
In the CAV recording, it is necessary to vary the recording-system clock frequency in accordance with movement of a recording position, and conventionally a signal generated by multiplying a wobble signal is used as the recording-system clock. However, since the wobble signal is easily susceptible to influences of a disk and a pick-up and its quality is prone to be deteriorated by an influence of a large amount of light at the time of recording etc., it is difficult to maintain jitters of the recording-system clock to a sufficiently low value. To resolve this problem, instead of generating a recording-system clock signal from the wobble signal that is susceptible to noise, a necessary recording-system clock frequency is calculated from the address information that has been modulated into the wobble signal and recorded therein, and a signal of this frequency is generated from a stable reference signal source, such as a quartz oscillator, by a synthesizer method and used as the recording-system clock.
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