Electricity: motive power systems – Positional servo systems – Program- or pattern-controlled systems
Patent
1996-04-26
1997-09-02
Shoop, Jr., William M.
Electricity: motive power systems
Positional servo systems
Program- or pattern-controlled systems
G05B 1918
Patent
active
056636237
ABSTRACT:
A servo apparatus for high speed reproduction in a digital video tape player includes heads and uses a helically scanned video tape on which high efficient coded video data is recorded in the same manner as being divisionally recorded at positions via which the head travels when intra-coded video data among the high efficient coded video data is reproduced at a high speed. The servo apparatus includes a head drum motor for rotating the head at a constant speed according to high speed reproduction and outputting a signal related to the rotation of the head, a capstan motor for transferring the video tape and outputting a signal related to the transfer of the video tape, a vertical position detector for generating vertical position data of the head with respect to the video tape by using the signal output from the head drum motor and a system clock, a horizontal position detector generating horizontal position data of the head with respect to video tape by using the signals read from the video tape by the head, a head trajectory controller for generating a speed varying signal so that a head traces at positions on which the intra-coded video data is recorded using the vertical position data generated by the vertical position and the horizontal position data generated by the horizontal position detector and prestored head trajectory information for the high speed reproduction and a capstan servo unit which receives the speed varying signal of the head trajectory controller and the output signal of the capstan motor, to control a rotational speed of the capstan motor.
REFERENCES:
patent: 4366371 (1982-12-01), D'Arc et al.
patent: 4890169 (1989-12-01), Kobayashi et al.
Lockett Kim
Samsung Electronics Co,. Ltd.
Shoop Jr. William M.
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