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:
Feb. 19, 2008
Filed:
Jan. 15, 2003
Toshiyuki Satomi, Osaka, JP;
Naoya Tokunaga, Osaka, JP;
Takaaki Konishi, Osaka, JP;
Hisaya Kato, Kyoto, JP;
Toshiyuki Satomi, Osaka, JP;
Naoya Tokunaga, Osaka, JP;
Takaaki Konishi, Osaka, JP;
Hisaya Kato, Kyoto, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
A synchronization error occurs when a DTV signal is distorted on a transmission path and this deteriorates demodulation capability. The digital demodulation device and the synchronization detecting method of the invention can correct the synchronization position when determining that a synchronization error has occurred. A controller receives a center tap coefficient, for example, from a waveform equalizer and compares the coefficient with a given center tap coefficient threshold. If the coefficient is smaller than the threshold, the controller determines that a synchronization detector has made a synchronization error and outputs a control signal. The synchronization detector receiving the control signal re-detects a sync signal included in a received signal, to detect a new correct sync signal and thus correct the synchronization error.