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:
Aug. 03, 2010
Filed:
Mar. 14, 2008
Hideki Sakamoto, Iwaki, JP;
Hideki Sakamoto, Iwaki, JP;
Alpine Electronics, Inc., Tokyo, JP;
Abstract
A dropout detection device, a disk reproduction apparatus, and a dropout detection method for detecting the occurrence of a dropout are provided. A low-pass filter outputs, as a signal LFENV, a low-frequency component of an envelope signal ENV generated by an envelope generation circuit, which represents an upper envelope of a first RF signal RFinput from an RF amplifier unit. An adder adds a shift amount SH to the envelope signal ENV, and outputs a resultant signal as a shifted envelope signal SENV. A comparator outputs a dropout detection signal DET during a time period PT in which the signal LFENV is larger than the shifted envelope signal SENV. A detection control unit detects an amplitude ARFof the first RF signal RF, and changes a frequency gain characteristic of the low-pass filter and the shift amount SH according to the magnitude of the detected amplitude AR
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile