Optical disk device, playback method of the optical disk device, and reproduction signal generating circuit

摘要

An optical disk device according to an embodiment of the present invention includes: an irradiating unit irradiating an optical disk with laser light; a photodetector split into at least two along a track direction of the optical disk and converting return light from the optical disk into an electric signal to output a detection signal; and a reproduction signal generating unit generating an RF signal based on the detection signal from the photodetector. The reproduction signal generating unit generates an RF signal in a header portion based on a detection signal from one of the at least two photodetectors split along the track direction or a detection signal from the other photodetector. An RF signal in a data portion is generated based on all of detection signals from the photodetector.