A video adapter converts an analog image signal output from a personal computer to a digital signal. The clock frequency, phase data, and display position data for the A/D conversion are set automatically according to the analog image signal to adjust for any offset. An A/D converter analog/digital converts...http://www.google.com.tw/patents/US5917461?utm_source=gb-gplus-share專利 US5917461 - Video adapter and digital image display apparatus
