| 摘要 |
A display system has a first resolution video buffer 20 , and can insert a second resolution analog video signal, the first resolution being higher than the second resolution. It can sample the second resolution video signal and insert it 50 without substantially reducing the resolution of the image. An advantage over software solution is more independence from software standards. The sampling can involve asynchronous over-sampling 130 to two or more states, adequate for recreating text or attributes. Then a re-sampler 52 uses a pixel clock derived 54 by counting coincidences of image and clock transitions, and adjusting a clock phase or frequency to minimize the count.
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