[mythtv-users] Interlacing [was: Pvr250 issues - any suggestions?]

[papenfuss at juneau.me.vt.edu]

> >I find this whole interlacing business very annoying!  Interlace was a
> >technical trick from the start of television to reduce the bandwidth
> >requirements - we really don't need it any more!
> 
> Yeah legacy sucks :-)
> 
	Actually, unless you want your cable and broadcast TV to have half as 
many channels, half as many scanlines, or a 30 Hz refresh, it's still 
necessary... :)  I wouldn't say interlacing is a trick so much as a requirement 
for analog video to make the bandwidth requirements reasonable.  The clever 
technology in color television is very impressive... fit 3 channels of video 
into 1/2 the bandwidth of a 15kHz x 60Hz B&W video signal.  Pretty clever... 
and the interlacing was a simple factor of 2 reduction that didn't affect human 
perception much at all.

	Only with lossy digital compression (read: MPEG) and multi-bit symbols 
in the digital modulation can HDTV get comparable (and better) signals in the 
same bandwidth.

Cheers,
-Cory

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