Re: [MP3 ENCODER] Correlation & mid/side

[Frank Klemm]

::  I'm in the process of adding mid/side to my encoder now, and have just put
::  in a first pass based on what the ISO spec 'specifies' (OK - suggests?
::  hints at?) in Appendix G.  Their switching criterion seems particularly
::  random and strange:  it is based on a comparison of the sum and difference
::  of the squared energies of the two channels:
::  
::      sum(rl[i]^2 - rr[i]^2) < 0.8 * sum(rl[i]^2 + rr[i]^2)
::  
May be a good hint. But this should NOT be done without any spectral
weighting. Are the rl and rr in the frequency domain or in the time domain?

LR/MS switching should not be influenced by any DC in the input.

What about feeding gpsycho with IIR prefiltered time domain samples instead
of the non filtered linear samples?

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Mit freundlichen Grüßen
Frank Klemm
 
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