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crt Squeal /hiss/buzz

Discussion in 'Projectors, Screens & Video Processors' started by barcoguy, Aug 26, 2004.

  1. barcoguy

    barcoguy
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    hello all this is a stupid question. Is it common for a crt projector to make the same sound as a tv does when no image is displayed. It sometimes does it at tv resolution 15.6khz but then it may or may not do it at others.


    and thanks to all who have helped me in the past i have a correctly setup barco 808g with new mec tubes.
     
  2. Roland @ B4

    Roland @ B4
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    They all do it to a lesser or gretter extent.
     
  3. barcoguy

    barcoguy
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    great thanks alot i was worried i had something setup wrong
    thanks alot
    nick
     
  4. Lux In Umbra

    Lux In Umbra
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    15.6kHz is within the human hearing range (usually quoted from around 20+Hz up to around 22kHz), so that probably explains why it is more noticeable ... the higher frequencies might put out just as much "squeal", but at, say 32kHz, you wont hear it.
    I think you probably hear it more when it has no image, because the scanning drops back to an "idling" state. (Experts - feel free to correct!)
    It (well, mine) also makes some of these sounds when it is starting up, before the image is displayed. I assume that this is from it starting on a rather low scan rate.
     
  5. barcoguy

    barcoguy
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    thanks alot
     

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