FreeLists / opendtv / [opendtv] Re: No Commentary on Fox/NASCAR Broadcast

[Richard Hollandsworth <holl_ands@xxxxxxxxx>]

One additional thought re the "Missing Sports Dialog" problem described below.
They describe a situation using a Stereo only TV using "Hyper-Stereo" ,
aka "Expanded Stereo" or something similar, my Hitachi just calls it "Matrix 
Surround".....
but I never liked the "fake" sound.

There are no doubt different implementations....some early ones simply added a 
small
amount of L to R (and vice versa), except inverted
in order to lower
the L+R signal and emphasize the surround sound field.

More modern synthetic surround modes may do something similar, except they also 
can derive
LS/RS signals in a Dolby Decoder chip (which delays them a bit to emphasize the 
surround effect)
and reinsert onto L/R speakers....give or take a proprietary algorithm.....

So if you have missing dialog problems while listening in Stereo, switch off 
the Hyper/Expanded Stereo.

Here's an example Demo:
 http://www.qsound.com/demos/3d-audio.htm

Obviously, this is only one way for Dialog to disappear....and since I never 
use it, all of my experience
 with missing Dialog and/or Center Channel is a different fault mechanism.....

holl_ands

=================================================
John Golitsis <jgolitsis@xxxxxxxxxx> wrote: Well you certainly know what you're 
doing then.  I thought that if you didn't have surround speakers, then that 
would account for the missing dialog.  If the commentary is intentionally 
out-of-phase, then a DPL circuit would route it to the surrounds.  No 
surrounds, no commentary.


On 31-May-07, at 5:43 PM, Richard Hollandsworth wrote:

Yes, 10-in L/R, 7-in C, LS, RS (all DIY) and pair of vintage Altec VOTT 15-in 
SWs.
Matching Planar Magnetic Midranges and Ribbon Super-Tweeters.

But I frequently listen to just the 42-in Hitachi Plasma (large detachable 
speakers)
plus an external 7-in "sub-woofer" I built as a separate section in the Center 
speaker.

holl_ands

===================================
John Golitsis <jgolitsis@xxxxxxxxxx> wrote: Do you have surround speakers?  
Sorry if this has been covered already - I haven't been following this thread.

On 31-May-07, at 4:54 PM, Richard Hollandsworth wrote:

Further trolling on www.linearacoustic.com revealed yet another mechanism
for "missing dialog", esp. during sports events...or with an overly aggressive
synthetic surround mix:
http://www.linearacoustic.com/sports/index.htm

Several music and sports broadcasts (incl. FOX) have been using SRS Circle 
Surround
encoding to synthetically "enhance" their ambience:
http://www.srslabs.com/pressarticle322.asp?sid=249
Which is why they sound "fake".......

The Stereo (Lt/Rt) downmix would contain an ample amount of anti-phase signals.
Linear Acoustic claims that the synthetic surround processors in some
TVs and AV Receivers somehow gets confused and nulls out the Center channel.

But, I've never "fixed" a missing dialog problem in a Stereo program by simply
switching off my AV Receiver's PL-II synthetic surround mode....so go figure....

holl_ands





        


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