[opendtv] Re: No Commentary on Fox/NASCAR Broadcast
- From: "Dale Kelly" <dalekelly@xxxxxxxxxxx>
- To: <opendtv@xxxxxxxxxxxxx>
- Date: Wed, 30 May 2007 17:00:58 -0700
That makes more sense than my stereo phase reversal theory, which couldn't
happen in the digital world, once the audio was mixed and encoded into 5.1.
Some network DTV signals are distributed in such a way that they can be
taken to base band by local stations and are encoded into the ATSC stream
locally. Fox, as I recall, sends their network signal pre encoded into the
19.3 MBs stream so there seems no chance of such a problem being introduced
at a local station.
Dale
-----Original Message-----
From: opendtv-bounce@xxxxxxxxxxxxx [mailto:opendtv-bounce@xxxxxxxxxxxxx]On
Behalf Of Richard Hollandsworth
Sent: Wednesday, May 30, 2007 4:07 PM
To: opendtv@xxxxxxxxxxxxx
Subject: [opendtv] Re: No Commentary on Fox/NASCAR Broadcast
From time to time I have heard programs that had a much reduced level
for the dialog.....this can occur for both DD5.1 and/or Stereo tracks.
And usually has reduced bass levels as well.
Sometimes switching to Stereo cures the problem...and sometimes not....
I can also compensate by using "Dialog Enhancement" mode on my Pioneer AV
Receiver.....just this week, I noticed a huge improvement on the
Stereo (only) signal during
World Music Award rerun on Analog MNT.
This avsforum post helps to explain this problem:
http://www.avsforum.com/avs-vb/showthread.php?p=10110611&highlight=Lt#post
10110611
DD5.1 outputs from the local station decoder are L/C/R/LS/RS/SW, where
the Center channel is a separate signal.
Stereo outputs from the same decoder are Lt/Rt, which INCLUDES the Center
channel.
If the station doesn't "throw the switch" correctly going from Stereo
program
(e.g. every commercial break) and DD5.1 program, then L/R may be
broadcast instead of Lt/Rt without accompanying C/LS/RS/SW signals
(no dialog, reduced bass).
You would think that this problem would be impossible with automated
equipment.....
Via DTV, there is only one DD5.1 data stream, so this error affects both
DD5.1
and derived Stereo outputs.
Via Cable, there are separate DD5.1 and PCM Stereo data streams, so
sometimes
I've noticed that only the DD5.1 signal is affected.....
holl_ands
=================================
dan.grimes@xxxxxxxx wrote:
I am having a consistent audio problems with my recordings of the NASCAR
races broadcast on FOX. Because I didn't watch the OTA signal live, I don't
know if it is in the recording or if it was live. I did watch a brief amount
on cable at a friend's house (while waiting for the Indy 500 rain delay) and
the commentary was consistent.
The symptoms are these: the audio is fine for all commentary and
commercials until the drop of the green flag. When the race starts, all I
get is natural sound, the audio of the race cars, and short blips of
commentary. Commercials run fine with the proper audio. The audio for the
racing action switches based on the visual (i.e., an in-car cam has in-car
audio, a track shot has the audio with the cars zooming by, etc.). However,
every once in a while, you hear a short bleep and there is some commentary
and a second later it goes back to natural sound without commentary. This
happens the entire length of the race up to the post race when everything is
good again.
I am guessing that my VCR is stuck on recording SAP and that this isn't
happening on the regular broadcast (I checked my VCR and it says it is
recording the standard stereo broadcast.) I can't imagine this happening on
multiple races without fixing it. I am guessing that the feed to the SAP is
some aux channel on a router that is switching based some other control
signal and that the natural audio is mixed on a separate console than the
commentary or final output is mixed on. Does FOX (or whoever is producing
audio) know that this is going out? Does this audio go with some special
feature? Does anyone know an engineer working on the NASCAR live trucks?
Dan Grimes
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