>
> Robert Hegemann wrote:
> >
> > Where can I upload a 10 seconds cut from "Main Theme" wave
> > so you can make your own picture of the problem I have with it?
> >
> > Robert Hegemann
>
> Hi all,
>
> I contacted Robert and he emailed me the file. You can now get it
> here:
>
> http://www.zip.com.au/~erikd/Main_Theme.cut.wav
>
> I played it and I can see why the encoder might be having trouble
> with it. There's a huge reverb wash with drums mixed in at a lower
> volume. The reverb wash then seems to morph into a string synth sound.
> Ouchh!
>
Thanks! I have added this to my collection - I have 4 such samples now,
where the problems are caused by Lame switching (or in some
cases not switching) to mid/side stereo. I think Lame needs a better
switching critereon. I have been meaning to try out the algorithm in:
Johnston and Ferreira, Sum-Difference Stereo Transform Coding, Proc. IEEE ICASSP
(1992) p 569-571.
where they switch to mid/side stereo not based on FFT energies, but
instead by comparing masking thresholds between the L & R channels.
I'd like to try this because this is the reference the MPEG AAC encoder
papers cite for their mid/side stereo algorithm.
Mark
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