Re: 480p or 1080i

So which is more *likely* to be the best quality conversion the STB or a higher
end HDTV? I am running a Motorola DSR500 satellite STB. It does NOT have
DVI/HDMI -- only component, so I guess I don't have that option-- but would like
to know, in case I ever do

--
All the Best
Richard Harison

"Randy Yates" <yates@xxxxxxxx> wrote in message news:m31wx2gywc.fsf@xxxxxxxxxxx
"Jeff Rigby" <jeffg212@xxxxxxxxxxx> writes:

"Bob Engelhardt" <bobengelhardt@xxxxxxxxxxx> wrote in message
news:PYKdnXoGONfIZYvZnZ2dnUVZ_tWdnZ2d@xxxxxxxxxxxxxx
Jeff Rigby wrote:
...
HDMI Best Digital HD (usually the best but depends on
which converts digital to analog better the STB or the TV)...
~~~snip

A gross oversimplification of an HDTV receiver block diagram consists
of an MPEG2 decoder (compressed digital input, uncompressed digital
output) followed by D/A conversion (uncompressed digital input, analog
output).

The MPEG2 decoder decodes what was produced by the MPEG2 encoder.
It is the MPEG2 encoder that produces errors due to fast-moving objects.

The D/A conversion stage is what's being compared above with respect to
DVI/HDMI versus component video (or lower). A DVI/HDMI interface requires
the settop box to perform the MPEG2 decoding and then transfers the
uncompressed digital information to the TV, and the TV is responsible
for D/A conversion. When using the component video interface out of
settop box, the settop box performs both the MPEG2 decoding AND the
D/A conversion.

However, in neither case would D/A conversion produce the "fast-moving
object" artifacts you refer to. Instead, D/A conversion errors could result
in things like

a. improper color balance (mismatched conversion)
b. decreased video SNR (spurs or other nonlinear effects in D/A conversion)
c. decreased video resolution (limited bandwidth)

References

[1] High-Definition Multimedia Interface Specification Version 1.2a
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