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HDTV video noise. Why does HD video contain noise?

I am just curious...can anyone out there explain to me how an HD picture can contain video noise? I thought that HD is digital which means it is essentially 0s and 1s. Coming from that logic the HD broadcast should be perfect every time, unless there is actually signal interruption.

Yet on my XBR4 LCD TV there is quite often noise present in the HD broadcast and when I enable noise reduction, it ussually cleans up the image really nicely, but I don't understand why and how there is noise in a first place in a digital signal?

Also, on my 1080P upconverting DVD player, when I play DVDs there is also an amount of noise in the picture that is cleaned up by my TVs noise reduction. It's connected through HDMI so once again...how does a digital signal contain noise?

My only guess is that the noise is present in the material itself, meaning it is part of the original piture on HD broadcasts, although I am still not sure about DVDs.

If someone is technical enough to explain it to me, I'd appriciate it. I was unable to find anything useful when Googling on the subject.

Thanks!

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Look at the source material.

In reply to: HDTV video noise. Why does HD video contain noise?

Most content is not digital but being pulled from film. It is entirely possible for there to be noise.

Bob

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I'm no technophile, but am under the impression that

In reply to: HDTV video noise. Why does HD video contain noise?

imperfect interpretation of a digital data stream that often does contain some missing information, goes through internal siganl processing which may misinterpret some info & introduce its own incorrect modification/interpretation. Net result: visible video noise on the screen.

The short message: digital isn't necessarily perfect.

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most niose in the picture is caused by the TV.

In reply to: HDTV video noise. Why does HD video contain noise?

In most cases TV's cause most of the niose internally, with all the over processing the TV does for sharpness and edge enhancments.

Try turning the sharpness all the way down to 0 and turning any auto edge enhancments or color correction off, and you may try turning the contrast down also, all TV's are pushed so hard in brightness for the sales floor they cant do it cleanly aka stablelity, its like trying to get your car to idle smooth while the RPM's are in the red line.

hope this helps
good luck
gabe

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