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The Arrowhead display seems to be more useful for NTSC than for PAL+ or for signals that will be converted to NTSC. In those areas where the signal will remain in 625 PAL+ what is the value of the Arrowhead display?

問題:

The Arrowhead display seems to be more useful for NTSC than for PAL+ or for signals that will be converted to NTSC. In those areas where the signal will remain in 625 PAL+ what is the value of the Arrowhead display?

答案:

The Arrowhead display is a representation of how a signal will encode to PAL or NTSC (maybe both, if scan-converted for another country), This information has not been readily available without the use of an NTSC or PAL encoder. It is true that 100% color bars can be transmitted by PAL transmitters, but it is also true that a signal could be encoded to greater than the 100% color bar levels through a misadjustment of the camera, or a misadjustment in the graphics paint box. Of course this could be seen other ways, but it may be of some value to look at the signal the same way in different formats. Even though the Arrowhead display may be more important in the NTSC domain, it is still useful for signals that may be transmitted by PAL broadcast transmitters.

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常見問答集 ID 59841

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