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. 03, 1998
Filed:
Oct. 19, 1995
Man Chul Choi, Seoul, KR;
Goldstar Co., Ltd., Seoul, KR;
Abstract
This invention relates to automatic tracking devices of digital VCRs which is provided to have a capability of precise control of the tracking by detecting rate of error due to variation of tracking of a rotating head. The devices comprise a pre-amplification part for amplifying reproduction signals scanned at a rotating head of a head drum to any level in reproduction, a modulation and demodulation part for restoring amplified reproduction signals in the pre-amplification part into digital signals, a format and deformat part for arraying the digital signals restored in the modulation and demodulation part to original signals, an error correction part for detecting presence of errors caused during recording in the digital signals arrayed by the format and deformat part and generating correctable and incorrectable control signals according to the rate of error detected, and an automatic tracking control part for controlling the tracking through a servo system by generating tracking data according to the rates of error obtained through addition of different weightings to each of the control signals transmitted thereto from the error correction part.