| 摘要 |
An automatic aspect ratio (AR) compensating apparatus for a television receiver having a double window function which enables a full-screen display of two video sources having different ARs. The apparatus includes a memory control and reformatting section for receiving and storing in a memory analog-to-digital-converted and horizontally filtered video data of the video sources, detecting the ARs of the respective video sources from the stored video data, and reformatting the stored video data to compensate for the respective ARs, first digital-to-analog (D/A) conversion sections for reading out the video data of the video sources from the memory line-by-line in a vertical direction, D/A-converting, sampling/holding, and low-pass-filtering the read video data, respectively, and second analog-to-digital (A/D) conversion sections for A/D-converting output signals of the first D/A conversion sections utilizing a sampling value in a vertical direction so that the number of vertical data becomes the optimum number of effective scanning lines, and storing the converted video data in the external memory. |
