[opendtv] Re: Mediaflo Technology
- From: Ron Economos <k6mpg@xxxxxxxxxxx>
- To: opendtv@xxxxxxxxxxxxx
- Date: Thu, 09 Nov 2006 16:19:11 -0800
The horizontal resolution of analog NTSC captured over the air
is around 440 pixels. Here's the math:
1000/1001 * 30 = 29.97002997... frames/sec
1/29.97002997... = 33.3666666... milliseconds/frame
33.3666666... / 525 = 63.555555... microseconds/line
63.555555... * 4200000 = 266.9333333... cycles/line
(4.2 MHz video bandwidth of OTA NTSC)
A "cycle" represents 2 pixels.
266.93333... * 2 = 533.8666666... pixels per line
However, 17% of the scan line is blanking.
533.8666666 * 0.83 = 443.1 pixels per active line
Vertical resolution is a different bag of worms.
Ron
Mark Aitken wrote:
NTSC is 'effectively' 320 x 240? Really?
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