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:
Sep. 15, 2009
Filed:
Apr. 18, 2005
Akira Kawabe, Osaka, JP;
Akira Yamamoto, Osaka, JP;
Akira Kawabe, Osaka, JP;
Akira Yamamoto, Osaka, JP;
Panasonic Corporation, Osaka, JP;
Abstract
In a playback signal processing device for extracting, from an analog playback signal, playback data and a clock synchronized with the playback data, a digital equalizeris disposed outside a clock extraction loop formed by an interpolator, a timing recovery circuit, and a control circuit. The digital equalizeris provided between an A/D converterand the interpolatorand performs equalization processing on digital playback data from the A/D converterin accordance with the timing of a fixed clock CLK from a synthesizer. The coefficients of the digital equalizerare updated by the control circuitby using a coefficient setting deviceaccording to frequency ratio informationfrom the timing recovery circuit. Accordingly, the clock extraction capability is enhanced in spite of the equalization processing on the playback signal by the digital equalizer.