revery wrote:

> I have a question on the decoding MS recordings, for instance just 2
> channel, by using an ambisonic decoder to create the stereo.
> Am I off the track here? Would an elaborate MS to ambisonic converter be
> required, or maybe just a level change between M and S?
> My purpose is to be able use say Harpex to to do the extra magic it does
> with converting to different microphone configurations etc, and the
> possibilities with double MS.

I believe that Harpex-B requires 4 inputs W,X,Y,Z (called 1st Order B-Format).  
It handily converts this to many different configurations including stereo, and 
one has the option of effectively changing the stereo orientation including 
Blumlein, X/Y, A/B etc.  The requirement is the 4 inputs-- something that 
conventional M-S recording will not have.

There are ways to convert a stereo input into B-format, however.


Dan Courville's excellent Ambisonic Studio offers some really interesting ways 
of converting a stereo signal into the 4 B-format.  Once converted, the 
B-Format signal can be used in Harpex-B.  There are other options.


Ultimately, I believe that if your input is conventional mid/side stereo, you 
will be able to very effectively expand and collapse your stereo field with a 
simple M-S decoder like Tom Erbe's free Matrix~ that is part of his Freeware 
package at http://www.soundhack.com/freeware/.

I, too, have been struggling with these issues.

Scott

 
www.thethirdbarn.org
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