Scaler Question.

Discussion in 'Projectors, Screens & Video Processors' started by Rob, Nov 6, 2000.

  1. Rob

    Rob
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    Can you use a scaler with a Seleco 320? I suspect not, but I thought I would ask.
    Cheers.
     
  2. Gordon @ Convergent AV

    Gordon @ Convergent AV
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    I'm afraid not. It isn't capable of a high enough scan rate.

    First Seleco capable of scaling is the 450 or old 450 I believe.

    Gordon

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  3. Rob

    Rob
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    Thanks for that info Gordon. Out of interest, what is the minimum scan rate that a scaler can be used and is it the same for a line doubler?
    Regards Rob.
     
  4. Gordon @ Convergent AV

    Gordon @ Convergent AV
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    Sorry Rob,

    Didn't see your question until now.

    Minimum rate would be 31.25kHz for PAL doubling and 31.5kHz for NTSC. This would be the same for scaling as well.

    Gordon

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  5. Rob

    Rob
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    Thanks again Gordon. I'm a little confused as to how the scan rate is noted in the spec. For a 320 it says ,

    Horizontal scan freq. 15-16Hz
    Vertical scan freq. 50-60Hz Autolocked.
    Bandwidth 12 Mhz

    And for the 400

    Horizontal scan freq. 15-16Khz and 30-32 Khz autolock.
    Vertical scan freq. 37-130Hz autolocked.
    Bandwidth 20 Mhz.

    Does this mean the scan rate is defined in the horizontal frequency IE 30-32 Khz autolocked? (400 model) I would have thought the vertical freq. was the deciding factor.

    Sorry if I seem a bit slow , but I'm interested in these things!
    Regards Rob.

    [This message has been edited by Rob (edited 11-11-2000).]
     
  6. Ludae

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    Both specs have a direct influence on what resolution and frame rate combinations are possible.

    The horiziontal scan rate in KHz tells you how many scan lines can be scanned per second (usually an close approximation).

    Eg. 525lines and 60Hz is 525x60 = 31500 (31.5Khz).

    For CRT devices there are line and frame fly-back times to consider (if not quoted in the spec) so you can't always work out the exact frame rate per resolution from the specs. May need to check with the manufacturer if unsure.

     
  7. Rob

    Rob
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    Thanks for that info. Its interesting to learn about these things from people like yourself and Gordon. You never know untill you ask, I guess we all have to start somewhere!
    Cheers.
     

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