Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the head
Patent
1995-10-19
1998-03-03
Psitos, Aristotelis M.
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Controlling the head
360 7712, G11B 5584
Patent
active
057242054
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.
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"Video Compression Makes Big Gains", Ang et al., IEEE Spectrum, Oct. 1991, pp. 16-19.
Cullen Larry T.
Goldstar Co. Ltd.
Psitos Aristotelis M.
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