Patent ID: 7995448
Filing Date: 2011-08-09
Classification: G11B

Abstract:
1. An optical disc device comprising: a high frequency band processing circuit for removing low frequency components of signals outputted from photodetectors of an optical pickup, and subjecting frequency bands of the signals up to an RF signal frequency to AD conversion using a high-speed low-bit AD converter, and then generating various kinds of signals required for recording/playback of an optical disc by digital processing; and a low frequency band processing circuit for removing high frequency components of the signals outputted from the photodetectors of the optical pickup, and subjecting the signals to AD conversion with a low-speed high-bit AD converter, and then generating various kinds of signals required for recording/playback of the optical disc by digital processing, wherein the high frequency band processing circuit includes plural stages of HPFs having different cutoff frequencies which are in ascending order with respect to the signals outputted from the photodetectors of the pickup, and performs detection of plural signals required for recording/playback of the optical disc using signals of desired frequency bands which are outputted from the respective HPFs.