E-Letters

May, 18, 2001

Component Video Switching

Dear Gary: You can use your existing receiver to do the job: Y (luminance) goes through the composite path, and the two color difference signals go through the S-video path. You will have to have adapters made for you to do the trick, from mini-DIN to RCA. This also works for RGB with sync on green. Let me know what you think. PS: WSR kicks ass!!!

Ralf Beckers, Belgium

mailto:post@ralfbeckers.de

Video Technical Editor Greg Rogers Comments:

This idea will work with standard-definition interlaced signals, but it may not be satisfactory for progressive-scan YPbPr outputs. The switching path for progressive-scan YPbPr (or RGB) signals should have a flat frequency response (within about 0.25 dB) to at least 12 MHz. In many receivers, the switching circuits, particularly for composite and S-video, may not be that good. HDTV signals require switching circuits with even higher frequency response. They should be flat to at least 30 MHz. Note that the frequency response bandwidth specification usually quoted is at a - 3 dB limit. Those bandwidth specifications should be at least 3-times the frequency limits given above.

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