Hi there,

To warn you, I'm a newbie in such things.
Got a surround system for my DVD-Player, which should be able to play Dolby Digital/Dolby Surround Pro Logic...
while listening to some CDs on my dvd-player, it seemed, that some of them mainly used the front speakers, but others (namely: Sting - The Soul Cages) nearly had surround sound. Very rich and full audio quality!

My Question: Is there any "kind" of surround Info in a normal Wav-File?
It seems, all of them have something like hall in them (but very silent).
I tried to enhance this kind of hall, but it only affects the front boxes.

Does anybody of you know, how to edit this Wav-Files to make them sound richer, when playing over my Surround system?
I'd like to edit my wavs and encode them in MP3

Dolby prologic and Dolby prologic2 are actualy just stereo with some "hidden" info in the stereo signal the turns on the extra surruond speakers.

That way you could have dolby prologic on normal stereo media (vhs tape or CD's)
the set back is that the resolutions of the extra speaker are no fully. Hence there are extracted from a stereo signal

Your amplifier are probaly detection some dolby prologic encodet CD's and play the back i dolby prologic sorruond.

there is nothing magic in dolby prolohic... if you rip the stereo wavs it will still contains these "hidden" surruond info as well.

Thanks, that's what I suspected.

And do you also know, which program and (function) I could use to make it louder?
Could I just take any of that surround editors (I think, I'll find a good one) and then save it as wav...?

Haven't made it before, is that possible?

I'll bet you can go to www.doom9.net en get som edolby prologic -> 4channels wave conveter and then use som audio editing tools.

probally convert back to DPL encodet stereo end burn as a new cd.

but i don't do much editing so i dont know the tools.

A pro-logic decoder gets the center channel from signals that are the same in left and right.
The rear comes from signals that are the same but out of phase. Dissimilar signals stay in the left and right. (all subject to frequency band limits).

Your sounds from the surround could be a CD that was deliberately mastered as pro-logic
(I have a Canadian Brass album labeled as such), or just an artifact of the way the performance was miked and mastered.

Two great utilities to encode as Dolby Prologic2 are HeadAC3he and BeSweet

But I have a question... will joint stereo preserve the surround information, or in this case is better to encode as dual channel?

edit: I mean if I already have a stream with surround info (like an AC3 3.2 or something) and want to encode it as MP2 or MP3.

Actually I think your best bet would be going lossless or non-psychoacoustic lossy, such as WavPack Lossy. If it HAS to be mp3 you could try full stereo OR LAME --alt-preset standard -nsmsfix 1.0, I seem to remember a thread where it was concluded that this seems to help preserve prologic encoding. If it doesn't have to be mp3, but it has to be smaller than WavPack Lossy try MusePack with and without MS stereo. My inclination is that a subband codec *might* do a better job than a transform codec.

This thread also might be of some use.

Thanks music man,

Let’s say that I want to make an SVCD and the sound must be MP2... what would be my best choice for preserving the surround info?
Joint Stereo, Full Stereo or Dual Channel?

no one can help me with the SVCD (mp2 cbr) surround problem?

Full stereo here too.
Dual channel is only usefull when you are encoding two totally different channels, like two different languages for example.
Joint stereo in mp2 is - if I understood correctly - intensity stereo, and not suitable for situations when the phase of the signal is important.

But take my words with a grain of salt. I may be wrong...

No, you're right! Joint Stereo in mp2 is just as you say. Avoid it (even if you don't have a surround system!) - unless the bitrate is so low that it's essential to maintain any kind of encoding quality (approx 128kbps, depending on content).

For mp3, it's a different matter - joint stereo is not evil, but good. However, if you're going to decode to surround, and then stick your ear right up to a surround speaker, you could hear problems. In this case -nsmsfix 1.0 is very helpful, as music_man said, but isn't suggested for general encoding.

Cheers,
David.

What about MP2 joint stereo as done by TooLame?