| 摘要 |
PROBLEM TO BE SOLVED: To provide a signal processing circuit for a VTR that attains reproduction frequency conversion while eliminating color crosstalk with a simple configuration and requires no adjustment. SOLUTION: A delay circuit delays a 1st reproduced color under signal by one or two horizontal periods, 1st and 2nd frequency conversion circuits convert the frequency of the delayed 2nd and 1st reproduced color under signals respectively into a frequency of a standard color signal, a frequency divider circuit divides 2n-sets (n is a natural number) of oscillated frequency signals of a carrier for the frequency conversion into the carrier frequency to form 4 carries having phases of 0 deg., 90 deg., 180 deg., and 270 deg., a changeover circuit respectively supplies the carrier to the 1st and 2nd frequency conversion circuits, where two frequency- converted signals are subtracted or added in phase or in opposite phase to eliminate color crosstalk between tracks. The delay circuit consisting of a CCD or the like to delay the under color signal has a lower clock frequency and can simply be configured and a no adjustment circuit can be realized.
|
