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  1. 25th Aug 2008 16:02 #1
    Movie-Maker
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    Typical video sampling rate is 13.5 Mhz but I am not able to realize how 13.5Mhz can yield 345600 (720x480) points per frame or 10357632 points per second (29.97 frames per sec).
    Obviously I am not understanding something correctly. Can someone please clear this up for me ?
    Thanks!
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  2. 25th Aug 2008 16:26 #2
    jagabo
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    It's not a sample rate, it's a bandwidth. As a rough approximation 720 * 480 * 29.97 = 10,357,632. But there are also timing pulses, unused scanlines, and the vertical retrace interval.

    http://lipas.uwasa.fi/~f76998/video/conversion/

    and see page 17 of:

    http://www.media-matters.net/docs/resources/Digital%20Files/Compression/Your%20Essenti...%20Digital.pdf

    page 10 of:

    http://www.poynton.com/PDFs/TIDV/Basic_principles.pdf
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  3. 25th Aug 2008 17:07 #3
    Movie-Maker
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    some good reading! Thanks!
    looks like that should clear up a few things,
    otherwise you will hear back from me!
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