Dynamic magnetic information storage or retrieval – Record editing
Patent
1985-03-01
1987-02-10
Psitos, Aristotelis M.
Dynamic magnetic information storage or retrieval
Record editing
360 27, 360 77, 360 101, G11B 2110, G11B 545
Patent
active
046427040
ABSTRACT:
A video signal reproducing apparatus comprises an error signal forming circuit (31) for providing an error signal (f) for tracking control and a movable head controlling circuit (34) for positioning control of movable heads based on the error signal (f). When still reproduction is started and a still reproduction instructing signal (c) is applied to a four-field pulse generating circuit (35), the movable head controlling circuit (34) is disabled by a detection period signal (d) of the high level in a four-field period provided from the circuit (35) to forbid the positioning control of the movable heads and an error signal (f) is formed by specified pilot signals reproduced from the movable heads where the positioning control is forbidden as well as by reference signals f.sub.1 to f.sub.4 selected successively. A still control signal generating circuit 40 determines and provides as output two reference signals most suitable for still reproduction based on the above stated error signal (f). When a four-field period has passed after the start of still reproduction, an error signal (f) is generated based on the determined reference signals and positioning of the movable heads is controlled based on the error signal.
REFERENCES:
patent: 4106065 (1978-08-01), Ravizza
patent: 4297733 (1981-10-01), Sanderson
patent: 4581658 (1986-04-01), Azuma et al.
patent: 4587580 (1986-05-01), Takayama et al.
Psitos Aristotelis M.
Sanyo Electric Co,. Ltd.
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