[opendtv] Re: Half Truths - Was More 1080p@60
- From: "Manfredi, Albert E" <albert.e.manfredi@xxxxxxxxxx>
- To: <opendtv@xxxxxxxxxxxxx>
- Date: Fri, 7 Dec 2007 19:55:08 -0500
> Being analog, NTSC TV has some 'slop' in the physical embodiment
> of the technical specifications it aspires to.
>
> How else would it be possible to play VHS tapes on a $30 VCR
> from Woolco that uses 'rubber bands' to spin the head drum and
> the capstan and still get a pretty good color picture from it?
The sync is provided in the recorded signal, not by the rubber bands!
I had one of the first hifi VHS recorders, which allowed audio-only
recording. (They quickly dropped that feature in hifi VHS VCRs.)
So in my first attempt, I just tried to record audio alone, no video
input, without paying careful attention to the switch settings.
It didn't work worth a d*mn.
Then I looked at the manual, and sure enough, there was a tiny switch
behind a front cover that had to be moved. So in audio-only, the VCR
synched up to the 60 Hz power frequency.
Anyway, I think that if you try to send 60 fps NTSC video, you will
notice the interference that Wikipedia article talked about.
Bert
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