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Old 11-28-2009, 03:36 PM   #13  
Compression Sucks

Join Date: Jan 2006
Location: Monrovia, CA.
Posts: 737

Originally Posted by electrictroy View Post
Here's what I come up with:
1920x1080 pixels
24 bit color per pixel
1/2 frame sent per second(interlaced)
24.9 million bits/second

That doesn't sound right. Help please. Where's the error in my math?
Are you asking about the total signal or the broadcast signal?
True HD is...

2200 pixels per line in 29.97 Frames per second (that includes active video and horizontal blanking)

1125 lines per frame (that includes active picture and vertical blanking)

29.97 Frames per second

10 bits for luminance

10 bits for chroma

so the math would look like this

1125 * 2200 * 29.97 * 20 = 1,483,515,000 bits or 1.484Gbps

But broadcast is different they stuff that into an MPEG frame.

They use only 8 bit color and only 1088 lines and I think only 1920 pixels.

1088 * 1920 * 29.97 * 16 = 1,001,698,099 bits or 1.002Gbps.

It wouldn't matter if the frame is "i" or "p" it would still be the same.

Last edited by 1080PsF; 11-28-2009 at 03:39 PM..
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