发明名称 Video signal reproducing apparatus using pilot signal system
摘要 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 f1 to f4 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.
申请公布号 US4642704(A) 申请公布日期 1987.02.10
申请号 US19850707344 申请日期 1985.03.01
申请人 SANYO ELECTRIC CO., LTD. 发明人 DOUTSUBO, NOBUHIDE
分类号 G11B5/588;(IPC1-7):G11B21/10;G11B5/45 主分类号 G11B5/588
代理机构 代理人
主权项
地址