CLOCK GENERATION DEVICE, CAPABLE OF GENERATING A CLOCK USED FOR CONTROLLING A RECORDING OF A DISK MEDIUM

摘要

PURPOSE: A clock generation device is provided to obtain a wobble signal including address information recorded by phase modulation, and to generate a clock signal synchronized with the wobble signal, thereby generating a reference clock synchronized with the wobble signal at high precision. CONSTITUTION: A detection circuit(12) monitors wobble data overlapped with address information recorded by phase modulation, and detects a period when a phase modulated part of the wobble data is inputted to a PLL circuit(13). A hold signal(S4) activated in the period is generated, and is outputted to the PLL circuit(13) to fix an output of the PLL circuit(13).