Title:
AUTOMATIC TRACKING CONTROL METHOD AND MAGNETIC RECORDING AND REPRODUCING DEVICE USING THE METHOD
Document Type and Number:
Japanese Patent JP3199083
Kind Code:
B2
Abstract:
PURPOSE: To obtain a reproduced video image with best picture quality at all times by adjusting tracking so as to minimize the sum of a noise level of a horizontal synchronizing signal and a crosstalk component of a chroma signal.
CONSTITUTION: Upon the receipt of a command of reproduction, a microcomputer 8 designates a predetermined tracking phase to a servo circuit 9. In this case, a reproduction signal picked up by rotary heads 2,3 is given to a head amplifier 5 or the like, and a horizontal synchronizing signal of the video signal via the amplifier 5 is given to an envelope detection circuit 20, in which the signal is converted into a DC voltage signal and it is inputted to an A/D converter circuit 7. On the other hand, a chroma signal reproduced via the head amplifier 5 or the like becomes a crosstalk component and it is converted into digital data signal at an A/D converter 7 via a detection circuit 24 and the data are stored in a computer 8. Then the computer 8 stores a level of the horizontal synchronizing signal and the level of the crosstalk component and controls a servo circuit 9 based on a tracking phase minimizing the level.
Inventors:
Hama Takefuji
Kazuhiro Konoshima
Kazuhiro Konoshima
Application Number:
JP47493A
Publication Date:
August 13, 2001
Filing Date:
January 06, 1993
Export Citation:
Assignee:
Mitsubishi Electric Corporation
International Classes:
G11B15/467; H04N5/783; (IPC1-7): H04N5/783; G11B15/467
Domestic Patent References:
| JP4134660A | ||||
| JP4348694A | ||||
| JP60131678A |
Attorney, Agent or Firm:
Masuo Oiwa