dolby suround sound on aurora FTA channels

[com@com.com]

Can anyone fill me if in Aurura channels such as seven central /
imparja abc atc transmitt a dolby surround sound signal when present
in the program. My humax decoder has a optical out which i assume is
for surround sound output ?

[bassett]

Stereo only, in most cases,

<com@com.com> wrote in message news:42664e96.9039057@news.bigpond.com...
> Can anyone fill me if in Aurura channels such as seven central /
> imparja abc atc transmitt a dolby surround sound signal when present
> in the program. My humax decoder has a optical out which i assume is
> for surround sound output ?

[Anthony Horan]

On Thu, 21 Apr 2005 14:27:05 +1000, bassett wrote:

> <com@com.com> wrote in message news:42664e96.9039057@news.bigpond.com...
>> Can anyone fill me if in Aurura channels such as seven central /
>> imparja abc atc transmitt a dolby surround sound signal when present
>> in the program. My humax decoder has a optical out which i assume is
>> for surround sound output ?
>
> Stereo only, in most cases,

Stereo, encoded with Dolby Surround information when the program's sound
was mixed that way. Just plug in and press the "Dolby Surround" or
"Pro-Logic" button on your receiver. Simple.


- Anthony

[nospam@no.com]

Ive only just purchased a yamaha 7.1 surround sound reciever
and the humax's audio via the optical lead is bloody awsome
...everything incl adds are in surround sound ...not sure what format
(just comes up as pcm on the reciever).

On Thu, 21 Apr 2005 16:27:34 +1000, Anthony Horan
<anthonyhoran@hotmail.com> wrote:

>On Thu, 21 Apr 2005 14:27:05 +1000, bassett wrote:
>
>> <com@com.com> wrote in message news:42664e96.9039057@news.bigpond.com...
>>> Can anyone fill me if in Aurura channels such as seven central /
>>> imparja abc atc transmitt a dolby surround sound signal when present
>>> in the program. My humax decoder has a optical out which i assume is
>>> for surround sound output ?
>>
>> Stereo only, in most cases,
>
>Stereo, encoded with Dolby Surround information when the program's sound
>was mixed that way. Just plug in and press the "Dolby Surround" or
>"Pro-Logic" button on your receiver. Simple.
>
>
>- Anthony

[Anthony Horan]

On Fri, 22 Apr 2005 07:17:32 GMT, nospam@no.com wrote:

> Ive only just purchased a yamaha 7.1 surround sound reciever
> and the humax's audio via the optical lead is bloody awsome
> ..everything incl adds are in surround sound ...not sure what format
> (just comes up as pcm on the reciever).

Actually, not everything is encoded in Dolby Surround. Most ads certainly
aren't.

However, because of the way Dolby Surround works, plain stereo sound mixes
will still generate some signal in the rear channel if played via a Dolby
Surround decoder. They are not, however, supposed to be listened to that
way.


- Anthony

[Ozdude]

"Anthony Horan" <anthonyhoran@hotmail.com> wrote in message
news:1uvun2251qrnl.w2yaz3okmeuw$.dlg@40tude.net...
> On Fri, 22 Apr 2005 07:17:32 GMT, nospam@no.com wrote:
>
>> Ive only just purchased a yamaha 7.1 surround sound reciever
>> and the humax's audio via the optical lead is bloody awsome
>> ..everything incl adds are in surround sound ...not sure what format
>> (just comes up as pcm on the reciever).
>
> Actually, not everything is encoded in Dolby Surround. Most ads certainly
> aren't.
>
> However, because of the way Dolby Surround works, plain stereo sound mixes
> will still generate some signal in the rear channel if played via a Dolby
> Surround decoder. They are not, however, supposed to be listened to that
> way.

Basically (and simply) anything that's out of phase to the main stereo L+R
(reflected sound at the source etc.) will come from the rear on a DPL(II(x))
decoder. I"ve noticed some quite strange "surround" effects on ads,
particularly cheap ones made by AA, where loud surround effects can be
heard - they sound to me like phase inversions on the sound mix channels,
possibly the result of lines wired reversed on the audio mixer used to
produce the ad.

Some times when the muxers bugger up, as SBS's seems to do on occassion,
you'll get the 'centre' channel coming quite loudly from the rears, which
can be quite annoying when the mouth it's coming from is in front of you ;)

Oz

[Anthony Horan]

On Sat, 23 Apr 2005 10:22:32 +1000, Ozdude wrote:

> Basically (and simply) anything that's out of phase to the main stereo L+R
> (reflected sound at the source etc.) will come from the rear on a DPL(II(x))
> decoder.

It has to be a specific degree out of phase, though.

> I"ve noticed some quite strange "surround" effects on ads,
> particularly cheap ones made by AA, where loud surround effects can be
> heard - they sound to me like phase inversions on the sound mix channels,
> possibly the result of lines wired reversed on the audio mixer used to
> produce the ad.

Possibly - but much more likely it's due to phase shifts caused by digital
reverbs, aural exciters, stereo image wideners, that accursed "sonic
maximizer" gadget and other processing devices.


- Anthony

[mick]

Ive just hooked up the optical lead and its sounds like real surround
sound to me ...not artifically generated..



On Sat, 23 Apr 2005 16:22:52 +1000, Anthony Horan
<anthonyhoran@hotmail.com> wrote:

>On Sat, 23 Apr 2005 10:22:32 +1000, Ozdude wrote:
>
>> Basically (and simply) anything that's out of phase to the main stereo L+R
>> (reflected sound at the source etc.) will come from the rear on a DPL(II(x))
>> decoder.
>
>It has to be a specific degree out of phase, though.
>
>> I"ve noticed some quite strange "surround" effects on ads,
>> particularly cheap ones made by AA, where loud surround effects can be
>> heard - they sound to me like phase inversions on the sound mix channels,
>> possibly the result of lines wired reversed on the audio mixer used to
>> produce the ad.
>
>Possibly - but much more likely it's due to phase shifts caused by digital
>reverbs, aural exciters, stereo image wideners, that accursed "sonic
>maximizer" gadget and other processing devices.
>
>
>- Anthony

[Anthony Horan]

On Sun, 24 Apr 2005 04:13:11 GMT, email wrote:

> Ive just hooked up the optical lead and its sounds like real surround
> sound to me ...not artifically generated..

Optical, coaxial, analogue, whatever. Dolby Surround only needs two
channels to work.

I suggest you read a little on the format so you can better understand why
you hear sound from your rear speakers even on non-surround-encoded
material.

Honestly, Dolby Surround must be one of the least-understood technologies
out there. It constantly seems to confuse people, and it's honestly not
rocket science.

[Peter Dun]

Aurora's transmission has been surround sound encoded since
it was switched to c1 ..no idea what format. Most of what i recieve
out of sev central / abc / imparja is real suround sound ..i'd guess
about 4/5ths of the adds and most of the programming.

the Wed, 20 Apr 2005 12:49:49 GMT, com@com.com wrote:

>Can anyone fill me if in Aurura channels such as seven central /
>imparja abc atc transmitt a dolby surround sound signal when present
>in the program. My humax decoder has a optical out which i assume is
>for surround sound output ?

[Anthony Horan]

On Sun, 24 Apr 2005 04:31:54 GMT, Peter Dun wrote:

> Aurora's transmission has been surround sound encoded since
> it was switched to c1 ..no idea what format. Most of what i recieve
> out of sev central / abc / imparja is real suround sound ..i'd guess
> about 4/5ths of the adds and most of the programming.

Ads are - with very rare exceptions - NOT mixed in Dolby Surround. Neither
is a good percentage of the programming. What you're hearing from your rear
speakers is accidental.


- Anthony

[Ozdude]

"Anthony Horan" <anthonyhoran@hotmail.com> wrote in message
news:1mftnk587n2nd.106psjrgkovfb.dlg@40tude.net...
> On Sat, 23 Apr 2005 10:22:32 +1000, Ozdude wrote:
>
>> Basically (and simply) anything that's out of phase to the main stereo
>> L+R
>> (reflected sound at the source etc.) will come from the rear on a
>> DPL(II(x))
>> decoder.
>
> It has to be a specific degree out of phase, though.

Yes, I agree, but some seem to take any 180 degree inversion as rear
channel. I won't mention specific brands, but they are out there ;)
>
>> I"ve noticed some quite strange "surround" effects on ads,
>> particularly cheap ones made by AA, where loud surround effects can be
>> heard - they sound to me like phase inversions on the sound mix channels,
>> possibly the result of lines wired reversed on the audio mixer used to
>> produce the ad.
>
> Possibly - but much more likely it's due to phase shifts caused by digital
> reverbs, aural exciters, stereo image wideners, that accursed "sonic
> maximizer" gadget and other processing devices.

Very true. I've also noticed on occassions (not lately though) SBS sound
worbles, or squelches on the front L&R, like the muxer isn't keeping up with
the bit rate or something, but it could be what you have stated -
processing.

Oz

[nospam@no.com]

What im hearing out of my humax is definately not artifically
generated surround sound from my reciever. Correct me if im
wrong ..When you hear a person speak and it comes destinctly only out
of the rear channel, then another person speaks which only comes
destinctly out of the front, i'd doubt if its only 2 channel. I was
also watching a movie on imparja where a passing car appeared from
rear to front..again i can't see how any dolby processing in my amp
can create that effect from a stereo only source. When i flick my
reciever the tv output (which is 2 ch stereo only) all those effects
are no longer. Its obvous to me that some of the programming and add's
are more than just 2ch stereo. I'd guess and say 5.1 or something
similar.



On Mon, 25 Apr 2005 03:32:42 +1000, Anthony Horan
<anthonyhoran@hotmail.com> wrote:

>On Sun, 24 Apr 2005 04:31:54 GMT, Peter Dun wrote:
>
>> Aurora's transmission has been surround sound encoded since
>> it was switched to c1 ..no idea what format. Most of what i recieve
>> out of sev central / abc / imparja is real suround sound ..i'd guess
>> about 4/5ths of the adds and most of the programming.
>
>Ads are - with very rare exceptions - NOT mixed in Dolby Surround. Neither
>is a good percentage of the programming. What you're hearing from your rear
>speakers is accidental.
>
>
>- Anthony

[Ozdude]

<nospam@no.com> wrote in message news:426cb924.19047765@news.bigpond.com...
> What im hearing out of my humax is definately not artifically
> generated surround sound from my reciever. Correct me if im
> wrong ..When you hear a person speak and it comes destinctly only out
> of the rear channel, then another person speaks which only comes
> destinctly out of the front, i'd doubt if its only 2 channel. I was
> also watching a movie on imparja where a passing car appeared from
> rear to front..again i can't see how any dolby processing in my amp
> can create that effect from a stereo only source. When i flick my
> reciever the tv output (which is 2 ch stereo only) all those effects
> are no longer. Its obvous to me that some of the programming and add's
> are more than just 2ch stereo. I'd guess and say 5.1 or something
> similar.

It's impossible to get 5.1 discrete into a stereo matrix. More likely to be
phase inversions either in your local signal source/path, or modulation
issues.

My Yamaha HT Amp when in ProLogic does it too at times. Not a lot lately but
there have been several past occasions where the "centre" came loudly from
the rears, and only on SBS.

That's not as bad a $even used to be though - quite often all the sound
would shift to the Left speaker only, or centred between the left and
centre. It hasn't happened lately so I presume they fixed something.

The most common thing that happens on my STB's is on SBS and the "centre"
channel in ProLogic is very spread across all three front speakers and
ping-pongs off-centre between extreme L and R very quickly, in the process
phase inverting and causing bleed into the rears - the overall effect is a
global surround of the centre channel.

My theory as to why this happens has to do with this squelching I hear if I
go right up to the speakers and listen.

It doesn't happen all the time, but when it does happen it's quite
interesting.

Sounds like really low bit rate musicam artefacting to me.

Oz