| 摘要 |
An improved screen aspect ratio conversion apparatus displays a 4:3 broadcast signal on a screen having an aspect ratio of 16:9 by expanding the screen aspect ratio to 4:3 in an interpolation unit and by removing a portion exceeding a certain range of the screen aspect ratio of 16:9. The apparatus includes a line interpolation unit for multiplying the first three lines and next three lines of video data by different coefficient values; a line selection unit for selecting at every line video data interpolated by the line interpolation unit in accordance with a selection control signal and video data obtained by a data storing unit; a sum unit for summing video data obtained by the line selection unit; a horizontal synchronous count unit for counting a start portion of a horizontal synchronous signal to be zoomed and generating a write enable signal when the horizontal synchronous signal reaches a zooming region; and a field memory unit for storing video data which are zoomed at 3:4 by the data sum unit in accordance with a write enable signal of the horizontal synchronous count unit. The apparatus further includes a side panel inserting unit for inserting a luminance level value of a side panel into video data from the second storing unit in accordance with selection control signals.
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