| 摘要 |
PURPOSE:To improve the horizontal linearity on a cathode-ray tube by varying the speed of a transfer clock between a storage means where fields of digital image data are inputted and stored, one after another, and a D/A converting means and generating clock speed data which becomes constant in beam speed on the tube surface. CONSTITUTION:An image memory 10 is stored with image data sent from the horizontal deflecting circuit and a line memory 20 is stored with data which are inputted from the image memory 10, field by field. Data of one field read out of the line memory 20 are received at a transfer rate based upon the speed data and converted into an analog signal by a D/A converter 50. The speed of the transfer clock between the line memory 20 and D/A-C50 is varied to generate the clock speed data which becomes constant in beam speed on the tube surface. Consequently, the horizontal linearity is corrected finely and digitally without altering the horizontal deflecting circuit. |
