Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the record
Patent
1987-11-16
1989-05-09
Tupper, Robert S.
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Controlling the record
360 102, 360 7802, G11B 552, G11B 2104
Patent
active
048293890
ABSTRACT:
A surveillance video tape recorder has a pair of video heads secured on a rotary drum at different heights in the direction of the axis of the drum, a capstan drive circuit connected to a capstan motor for driving a magnetic tape at a substantially constant speed in a search mode, a head switching circuit connected to the pair of video heads for alternately deriving reproduced output signals therefrom, a tracking signal generating circuit for generating a tracking error signal from tracking pilot signals included in the reproduced output signals and from a reference pilot signal, a head switching pulse generating circuit for generating and supplying a head switching pulse to the head switching circuit and a gate circuit connected between the tracking signal generating circuit and the capstan drive circuit. This gate circuit selects a portion of the tracking error signal to be supplied to the capstan drive circuit in response to a sampling signal generated on the basis of the head switching pulse so that tracking control is effected in a manner to substantially hide noise bars in the upper and lower portions of the displayed picture obtained in the search mode.
REFERENCES:
patent: 4510533 (1985-04-01), Tokuyama
patent: 4535367 (1985-08-01), Kanda
patent: 4568986 (1986-02-01), Furuhata et al.
patent: 4581658 (1986-04-01), Azuma et al.
Sinderbrand Alvin
Sony Corporation
Tupper Robert S.
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