[opendtv] Re: Digital vs. Analog Quality
- From: "John Willkie" <johnwillkie@xxxxxxxxxxxxx>
- To: <opendtv@xxxxxxxxxxxxx>
- Date: Fri, 11 Jul 2008 18:53:33 -0700
You can get an 8/16-VSB exciter on a PCI form factor (not suitable for
broadcast due to timing accuracy) for about $3,250, new.
DVEO has one (www.computermodules.com) as well as this one from Dektec
http://www.dektec.com/Products/DTA-115/index.asp
Or, if you want broadcast quality, you could try this
http://www.teamcast.com/en/maj-e/c2a2i14383/products/modulators/8-vsb-modula
tor.htm from TeamCast. It goes for about $7,000. They only OEM, but I
could get one for you.
And, knowing what I know about you, Cliff, you really do need one in your
basement lab.
And, you could get along without an encoder. Just capture some streams and
play them back with either a DVEO or Dektec DVB-ASI card.
John Willkie
-----Mensaje original-----
De: opendtv-bounce@xxxxxxxxxxxxx [mailto:opendtv-bounce@xxxxxxxxxxxxx] En
nombre de Cliff Benham
Enviado el: Friday, July 11, 2008 4:03 PM
Para: opendtv@xxxxxxxxxxxxx
Asunto: [opendtv] Re: Digital vs. Analog Quality
Manfredi, Albert E wrote:
It was about explaining that if you use a
> CECB to decode a TV signal, as opposed to watching the NTSC broadcast,
> over the composite interface, you should notice much better color
> resolution than from the NTSC broadcast. Because the CECB creates the
> composite signal from the 4:2:0 digital, and is not limited to the ~40
> lines in practical NTSC broadcasting. It is ONLY limited to the 120
> lines of NTSC at its practical best.
Yep, that was my point exactly. That is what I see with the CECBs when
comparing their S- and NTSC baseband outputs to OTA NTSC. I can't
quantify *how much* better the CECB is without running tests I can no
longer make.
If I still had access to the Harmonic MV50 encoder and 8VSB exciter I'd
hook it all up and send the list photos of the waveforms.
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