| 摘要 |
A video adapter and computer/video system generate a video output signal having a first format useable by other video equipment. This signal is then looped back through the video adapter to generate a signal in a second format suitable for previewing on a monitor or display. The video adapter includes at least first and second data rate changers (preferably FIFOs), a controller unit, and circuitry for scaling and color-space converting the computer-processed video into the second format. Externally provided video input is multiplexed to a rate-increasing FIFO whose output is coupled to an IOSIMM unit in the computer/video system for video processing, through a master rate-decreasing FIFO whose output is output-controlled, format-processed and provided as the first format output signal. The output-controlled signal is coupled to a scaler, color-space converter and passed to a master rate-increasing FIFO. The output from this FIFO is coupled to the loopback path, to the video adapter for processing into the second format for previewing. Various forms of externally-provided video, as well as internally generated or stored video may be processed for output and preview.
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