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. > >> > >> > > > > > > > > > >---------------------------------------------------------------------- > >You can UNSUBSCRIBE from the OpenDTV list in two ways: > > > >- Using the UNSUBSCRIBE command in your user configuration settings at FreeLists.org > > > >- By sending a message to: opendtv-request@xxxxxxxxxxxxx with the word unsubscribe in the subject line. > > > > > > > > > > > > > ---------------------------------------------------------------------- > You can UNSUBSCRIBE from the OpenDTV list in two ways: > > - Using the UNSUBSCRIBE command in your user configuration settings at FreeLists.org > > - By sending a message to: opendtv-request@xxxxxxxxxxxxx with the word unsubscribe in the subject line. > ---------------------------------------------------------------------- You can UNSUBSCRIBE from the OpenDTV list in two ways: - Using the UNSUBSCRIBE command in your user configuration settings at FreeLists.org - By sending a message to: opendtv-request@xxxxxxxxxxxxx with the word unsubscribe in the subject line.