Title:
VIDEO SIGNAL PROCESSING UNIT
Document Type and Number:
Japanese Patent JPS6461191
Kind Code:
A
Abstract:
PURPOSE:To eliminate crosstalk between both servo systems by applying time axis correction electrically through the use of two variable delay elements in the unit reproducing a recording medium such as a video disk or a video tape where a chroma signal is subjected to low frequency conversion and recorded with superimposition with a luminance signal. CONSTITUTION:A demodulated video signal inputted from an input terminal 1 is inputted to a terminal (a) of a changeover switch 2, which is switched to a position of terminal (b) side by a dropout detection signal inputted from an input terminal 4, and the signal is replaced with a demodulated video signal whose signal missing period is subjected to 1H delay by a 1H delay element 3. The demodulated video signal after dropout compensation is given to a 1H delay element 3 and a variable delay element 5. A variable delay element 6 has a similar characteristic as that of the element 5, and a video signal with 1H time difference is obtained at the output stage of both the elements 5, 6 and the video signals are added or subtracted to obtain a low frequency conversion chroma signal and a luminance signal. Both the variable delay elements 5, 6 are controlled by a clock signal (CK) synchronized with jitter and the jitter is corrected at the same time.
Inventors:
NISHIHARA MICHIHARU
Application Number:
JP21898087A
Publication Date:
March 08, 1989
Filing Date:
August 31, 1987
Export Citation:
Assignee:
SHARP KK
International Classes:
H04N5/953; H04N5/95; H04N9/78; H04N9/83; H04N9/85; H04N9/87; H04N9/89; (IPC1-7): H04N5/95; H04N9/85; H04N9/89
Domestic Patent References:
| JPS5249732A | 1977-04-21 | |||
| JPS5640385A | 1981-04-16 |
Attorney, Agent or Firm:
Yoshiro Kurauchi