The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 07, 2009
Filed:
Feb. 01, 2006
Youichi Ogura, Ibaraki, JP;
Shinichi Konishi, Nara, JP;
Youichi Ogura, Ibaraki, JP;
Shinichi Konishi, Nara, JP;
Panasonic Corporation, Osaka, JP;
Abstract
After a playback RF signaldetected from an optical disc mediumis waveform-shaped, it is converted into a digital RF signalwith a sampling clockhaving a cycle twice as long as a channel clock. Thereafter, a first offset correction circuitcorrects an offset fluctuation in a high frequency band, and a digital adaptive equalizerperforms adaptive equalization, and then a second offset correction circuitcorrects an offset component that remains after the offset correction by the first offset correction circuit, thereby demodulating a digital binary signal. Therefore, even when high-speed playback is carried out and an asymmetry depending on the recording quality is large, a reduction in power consumption can be realized while maintaining high-performance playback. Consequently, it is possible to provide an optical disc playback apparatus which can realize sufficient playback performance at low power consumption.