摘要:
The present invention provides a system and method for overlaying video from different video sources on a display device. The sources may include a primary video source that provides first image data in the form of a first video signal, and an overlay video source that provides second image data in the form of a second video signal and a fast blank signal. The system encodes the fast blank signal into the second video signal to form encoded image data. The fast blank signal can occupy one bit of the encoded image data. The system stores the first image data and the encoded image data in a frame buffer. A controller reads the first image data and the encoded image data from the frame buffer. The controller processes and decodes encoded image data, extracting the fast blank signal. The controller then uses the extracted fast blank signal to combine the second image data and the first image data, effective to overlay an image from the overly video source onto an image from the primary video source.
摘要:
The present invention provides a system and method for adjusting clock phase in a digital display. The display 10 may include a target analog-to-digital converter 104 that generates a first digital signal based on an analog input signal and a first clock signal (CLK1). The system 100 includes a first clock phase adjustment circuit 108, which provides CLK1 to the target analog-to-digital converter 104. A second analog-to-digital converter 106 receives at least a portion of the analog input signal and a second adjusted clock signal (CLK2), and generates a second digital signal based on these inputs. A second clock phase adjustment circuit 100 is communicatively coupled to the second analog-to-digital converter 106, and transmits CLK2 to the second analog-to-digital converter. A controller 112 receives the second digital signal from the second analog-to-digital converter 106 and uses the signal to determine a preferred phase of CLK2. The controller 112 then causes the first clock phase adjustment circuit to adjust the phase of CLK1 based on the preferred phase.