Do any AVRs synthesize surround channels

[Good4it]

when playing a stereo signal?

 

[Leemix]

All of them can, thats the point of Dolby Surround (Dolby Pro Logic) and also some DTS and Auro modes. And the center channel of course is matrixed from the stereo signal also.


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[Good4it]

I don’t mean just the stereo through the rear speakers but synthetic signals.

 

[Leemix]

I don’t mean just the stereo through the rear speakers but synthetic signals.

Not 100% sure what you mean by synthetic signal but its only 5 channel stereo/All channel stereo that just take the stereo signal and adds it to the surround speakers. Dolby Surround takes (afaik) an out of phase signal from the main left and right stereo signal and places them to the left and/or right surround speakers, so sound engineers can more or less choose what goes where for a multi channel setup with just a 2 channel source signal.


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[WaynePflughaupt]

Most receivers can “synthesize” the ambient acoustics of a performance venue in stereo mode, into rear or other speakers.

Regards,
Wayne A. Pflughaupt

 

[VonMagnum]

Yamaha has always been big on that fake venue DSP stuff. I've always found it to sound fake/terrible, personally, but then music at typical stadium or dance club has never been something to brag about, IMO. Most real venue recordings already contain reverb, etc from those venues. Slopping more on doesn't make much sense either, IMO. Now multi-channel stereo can produce some interesting natural imaging ftom recordings including some binaural extraction (within reason at controlled volumes where the surround channels don't overpower the mains).

 

[markw]

AVR's can generate "something" from a two channel source to play in the other channels. It's not what one would get from a true 5.1 recording, but it's still something.

Back in the day before DVD's and digital audio, Movies were recorded in "Dolby Pro Logic", or DPL which is where two additional channels were "matrixed" into two stereo channels. Those two additional channels were not full range but they sufficed for a center and a mono surround channel.

FWIW. Before DPL there was "Do;by Surround" which was enhanced to become DPL

A lot of current AVR''s took that and ran with it but, no, you cannot get more than two "discrete" channels from a two channel source.

If you really want to know, here ya go .https://www.lifewire.com/surround-sound-home-theater-1846357

 

[VonMagnum]

I think he was referring to 'DSP' type modes that synthesize concert halls and such, not surround upmixers.

 

[mtrycrafts]

I think he was referring to 'DSP' type modes that synthesize concert halls and such, not surround upmixers.

I think that type of DSP would just adjust the FR to what the company thinks should be, perhaps adding some phase shifting as well?

 

[lovinthehd]

All this time you've had avrs you've only used the multi-ch stereo modes? Never an upmixer like Dolby/DTS?

 

[VonMagnum]

All this time you've had avrs you've only used the multi-ch stereo modes? Never an upmixer like Dolby/DTS?

I'm not sure what gives you that idea, but then I'm not sure to whom you are talking either (yes my AVRs have upmixers and yes I use them; in fact I said I generally have not liked simulated room effects with DSP). But then I don't get what Good4it was really getting at either.

 

[lovinthehd]

I'm not sure what gives you that idea, but then I'm not sure to whom you are talking either (yes my AVRs have upmixers and yes I use them; in fact I said I generally have not liked simulated room effects with DSP). But then I don't get what Good4it was really getting at either.

The OP of course. Good4it has used avrs quite a while now. He does have issues he makes threads about with sound modes often, tho.

 

[TankTop5]

I’m currently running Focal bookshelf’s speakers off a NAD stereo receiver. Some movies in stereo image very well and I can rear a helicopter fly from behind me or gunshots off to one side. Is that what you mean?


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[lovinthehd]

I’m currently running Focal bookshelf’s speakers off a NAD stereo receiver. Some movies in stereo image very well and I can rear a helicopter fly from behind me or gunshots off to one side. Is that what you mean?


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It's about matrixing 2.0 sound into surround sound with an avr. Can't do it with a 2ch stereo receiver and two speakers....altho sounds like you have a decent soundstage setup.

 

[mtrycrafts]

It's about matrixing 2.0 sound into surround sound with an avr. Can't do it with a 2ch stereo receiver and two speakers....altho sounds like you have a decent soundstage setup.

Diane Deutch, I think, professor at a Cal university has a CD with sounds on it. Even just in stereo, no matrixing, she can demonstrate some very strange effects from her research. Good bit of phase shifting can make sounds come from different locations.

Why guess when you can Google most everything.
http://deutsch.ucsd.edu/psychology/pages.php?i=101

I have that Musical Illusions CD

 

[lovinthehd]

Then there's the phase trick you can do to get psuedo-quad from a stereo receiver with A/B speaker outputs...