ADDRESS REPRODUCTION CIRCUIT, AN OPTICAL DISK DRIVE AND AN ADDRESS REPRODUCING METHOD, PARTICULARLY REGARDING TO REPRODUCING ADDRESS INFORMATION FROM AN OPTICAL DISK INCLUDING WOBBLING-SHAPED GUIDE GROOVES DISPLAYING MODULATED ADDRESS INFORMATION

摘要

PURPOSE: An address reproduction circuit, an optical disk drive and an address reproducing method are provided to reproduce address information based on a reproduction signal read from an optical disk including wobbling-shaped guide grooves displaying modulated address information. CONSTITUTION: An A/D converter(4) converts an analog wobble signal(32) into a digital wobble signal(34). The A/D converter(4) samples the analog wobble signal(32) according to a timing signal(33) outputted from a VCO(6), and generates the digital wobble signal(34). A digital BPF(5) extracts necessary signal band components from the digital wobble signal(34). Based on detected phase and frequency errors, a loop filter(8) generates a control signal for controlling a VC. A maximum likelihood decoder(12) generates an address signal(35) displaying address information having a maximum likelihood from the digital wobble signal(34) according to a state transition rule defined by a modulation rule of modulated address information.