| 摘要 |
A vertical extension processing apparatus for eliminating a dark bar generated during a fast forward operation in a VCR of a PAL plus system is disclosed. The vertical extension processing apparatus of a video screen for supplying a video signal of a video signal reproducing circuit to a video signal processor by eliminating top and bottom dark bars generated during a fast forward operation in a VCR of a PAL plus system includes: a vertical extension operation circuit (314) connected to the video signal reproducing circuit (312), for generating a vertical extension operation signal by vertically extending horizontal scanning lines of the video signal by a sampling clock signal to 3:4; and a switching circuit (316-320) connected to the video signal reproducing circuit (312) and to the vertical extension operation circuit (314), for forming, during a normal operation, a path between the video signal processing circuit and the video signal reproducing circuit (312) by a control signal to generate the video signal, and for forming, during the fast forward operation, a path between the video signal processing circuit (312) and the vertical extension operation circuit by the control signal to generate the vertical extension operation signal. <IMAGE> |
