[opendtv] Re: EBU backs emerging 1080p standard
- From: "Allen Le Roy Limberg" <allimberg@xxxxxxxxxxxx>
- To: <opendtv@xxxxxxxxxxxxx>
- Date: Fri, 26 May 2006 18:12:00 -0400
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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>
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