Crescendo-Systems TC2000 Руководство пользователя - Страница 3

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6. Connect the power supply to the transcoder. Use only the supplied unit or an

exact equivalent.

Technical details and tips

The TC2000 implements the following two color conversions.

For 480p:

= 0.2990R + 0.5870G + 0.1140B

Pb = 0.5643 (B–Y) = –0.1687R – 0.3312G + 0.5B

Pr = 0.7133 (R–Y) =

For 540p/720p/1080i:

= 0.2126R + 0.7152G + 0.0722B

Pb = 0.5389 (B-Y) = –0.1146R – 0.3854G + 0.5B

Pr = 0.6350 (R-Y) =

Because of the transparent timing, the TC2000 relies on the source device or a program

like PowerStrip™ to set the correct horizontal and vertical sync width. A TV expects a

H-sync width of around 2μs for 480p and around 1μs for 540p/720p/1080i. If the H-sync

width is too long, the picture will look washed out with a white haze on it. A computer

monitor on the loop-through will not show this effect because this kind of monitor is

highly insensitive to the H-sync width.

If the picture looks washed out, try reducing the width of the H-sync, while keeping the

scan frequencies locked, until the picture looks good and a further reduction makes no

difference anymore. Do not reduce the H-sync width too much, 0.6μs is normally the

minimum width before a TV looses lock.

0.5R

– 0.4187G – 0.0813B

0.5R

– 0.4542G – 0.0458B

TC2000 users manual v1.1