[opendtv] Re: EBU backs emerging 1080p standard

Their legacy TV receiver problem was probably more serious than the one that
DTV faced when ATSC convened the RF Task Force at the turn of the century.

----- Original Message ----- 
From: "Cliff Benham" <cbenham@xxxxxxxxxxx>
To: <opendtv@xxxxxxxxxxxxx>
Sent: Friday, May 26, 2006 1:55 PM
Subject: [opendtv] Re: EBU backs emerging 1080p standard


> The real cause of this is the fact that in 1953, RCA chose to alter the
> NTSC sync frequencies from 15750/60
> to 15734.26/59.94 to maintain the 227.5 samples per line of 3579545.45
> color subcarrier rather than stick with
> 3583125 which worked perfectly well with 15750/60, but beat against the
> 4.5 mHz sound carrier producing a
> 920 kHz beat which was visible in the picture..
> They made this change screwing up television forever rather than offset
> the 4.5 mHz sound carrier to eliminate
> the 920 kHz beat between it and the color subcarrier. Poor choice.  What
> a ruckus this has caused over the years.
>
> John Shutt wrote:
>
> >The one that never got tackled but should have was 29.97/59.94.  Those
two
> >should have died a slow and painful death on the alter of drop frame time
> >code.
> >
> >John
> >
> >----- Original Message ----- 
> >From: "Tom Barry" <trbarry@xxxxxxxxxxx>
> >
> >
> >
> >>But both the i/p and the 50/60 are religious
> >>issues I'm always afraid to tackle.
> >>
> >>
> >
> >
> >
> >
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