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Uncompressed PCM Video

Discussion in 'General Electronics' started by Radium, Sep 10, 2003.

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  1. Radium

    Radium Guest

    I agree PCM uses lots of bandwidth which would make it impractical for
    an hour long movies. For a 10 minute psychedelic variation of colored
    patterens it would be perfect. Right?
     
  2. luminos

    luminos Guest

    It would be overkill for such a stupid use of bandwidth.
     
  3. Radium

    Radium Guest

    Not for psychedelic-lovers of visual virtual reality.
     
  4. Radium

    Radium Guest

    Reducing the sampling frequency should decrease the amount of bandwidth used.
     
  5. Radium

    Radium Guest

    Seriously, it would work.

    The bit-resolution should be 10^500 gigabit.

    The number of channels should be 10^500. Each channel should be
    4-dimensional to fit the criteria of virtual reality.

    Channels is the numbers of locations available for the signal.
    Stereo[scopic] has two different channels. Mono[ocular] has only one
    channel.

    The sampling rate should be low enough to make the bit-rate 10^-500
    (notice the negative sign) byte every 10^500 years.

    This would make a perfect psychedelic visual.
     
  6. Is that 10 to the 500th power BILLION bits per second and 10 to 500th
    power channels? You're in need of psychiatric and engineering help.
    Just venting.
    GG
     
  7. Radium

    Radium Guest

    Its "theoretical".
     
  8. Radium

    Radium Guest

    Yes. However, the slow sample rate should decrease the bit-rate and
    thus the bandwidth (See below)

    Bit-resolution = 10^500 gigabit per 10^-500 second (notice the
    negative)
    Number of channels = 10^500
    Bit-rate = 10^-500 byte every 10^500 years (notice the negative)
    Sampling rate = ?

    Given the bit-resolution, # of channels, and bit-rate, what frequency
    would the sampling rate have to be?
     
  9. Every once in a while
     
  10. Radium

    Radium Guest

    Is there any mathematical equation to find out what the sampling rate
    would be given the other information?
     
  11. erik phoxie

    erik phoxie Guest

    Jeez. You know that. Sampling rate should be twice the amount your
    senses can experience. This topic is a little stupid though. PCM
    coding of colours would mean we'd get a real low samplerate for that.
     
  12. Radium

    Radium Guest

    The purpose of the extremely slow sample rate is to make the the
    virtual reality much more psychedelic. A strong bit-resolution
    strenthens the visuals (less "noise", larger dynamic range, etc.). The
    large amount of channels would only add to the vertigo. Right?
     
  13. The resolution in bits (sample width) has nothing to do with it.
    Niquist theorem says we should sample AT LEAST 2x maximum frequency.
    The closer you are to 2x, the steeper you have to filter (before you sample).
    That may introduce iler artifacts (ringing etc.)
    So 2.1 or 2.3 should be safe.
    So one in a while to sample that Usenet post should be...
    JP
     
  14. Radium

    Radium Guest

    Ringing? In video?

    Ringing is an audio artifact not a visual one. Right?
     
  15. Well, you could hear it in audio I guess, but electronic types use 'ringing'
    when referring to the (damped) oscillations after a transient in ANY signal.
    A filter does not care or know if something is audio or video...
    Could be slow scan video in audio range too.
    JP
     
  16. Ringing? In video?

    Ringing is an audio artifact not a visual one. Right?
    [/QUOTE]
    No. Ringing as a big problem in video. Heck, the whole signal is
    nothing but pulses strung together. A continuous 'tone' is a test
    signal in video. Square waves are often the signal in video.
    GG
     
  17. erik phoxie

    erik phoxie Guest

    And err .. with a low sample rate, you mean an enormous amount of
    flicker/jerky video, or just counting the pixels kinda thing ? Or
    maybe, as someone mentioned, slow scan video as in: 'soft' updates?

    Explain .... still wondering what exactly you want, actually ;)

    greetz, e
     
  18. Radium

    Radium Guest

    Sampling rate is the number of samples per second. CDs use 44.1 khz.

    Sample rate deteremines the frequency response (or frame rate) of the
    video. In slow enough rates you can see the psychedelic
    flicker/vibrations in the visuals.

    Bit-resolution determines the SNR or dynamic range of the visuals.
    Less bit-resolution makes the video "noisier". I suppose in digital
    video you could count the pixels in a weak enough resolution. This is
    what I do *not* want in my video.
     
  19. BobGardner

    BobGardner Guest

    Just give it a strong bit-resolution, a low frequency sample rate, and
    None of you guys called him out for violating the sampling theorem. If the
    video is 4.5 MHz, you need to sample at 9 MHz. If you want 30 or 40 dB signal
    to noise ration, you want to sample at 8 bits or more. He just wantsa to see a
    digital version of Glen McKay's Headlights that played the Fillmore in '69 with
    the Airplane using a bunch of overhead projectors and colored water and oil
    jiggled by hand. See if you can google up a copy of Syntrilliium Kaliedoscope.
    Its pretty far out.
     
  20. Radium

    Radium Guest

    What does it mean for the "video to be 4.5 MHz"?
     
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