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.