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:
Mar. 30, 2010
Filed:
Jul. 18, 2006
Kouji Okamoto, Osaka, JP;
Akira Yamamoto, Osaka, JP;
Hiroki Mouri, Osaka, JP;
Panasonic Corporation, Osaka, JP;
Abstract
In a feedforward timing extractor for extracting timing information from a playback signal, a frequency ratio calculation sectioncalculates the ratio between the frequency of the playback signal and the frequency of the output clock of a frequency synthesizerby utilizing a specific pattern and a specific pattern appearing interval in the playback signal. A control sectioncontrols the frequency dividing rate of the frequency synthesizerin such a manner that the frequency ratio calculated by the frequency ratio calculation sectionhas a set value. Thus, as compared with a case in which the output clock of the frequency synthesizeris a high-frequency fixed-rate clock, it is not necessary to operate the digital circuits at high speeds. Consequently, even in cases where the playback frequency (the playback rate) of the signal changes with time, the decimation rate at which pulses of a fixed clock are eliminated is constant, thereby reducing power consumption.