<div>Hi, all</div>
<div> can anyone enlighten me what's the mathematical formula that are used to compute the vorbis noise curve(convolution, filter, spectrum energy, etc)? I looked at the new speex code, it is really hard to understand the compute_curve function(because of some other functions that it calls). And it looks to me it is not Psychoacoustic model II, which is well documented.
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<div> I checked the vorbis documentation and the paper<font size="2">: "Improved Noise Weighting in CELP Coding of Speech - Applying the Vorbis Psychoacoustic Model To Speex", but none of them memtions about it.
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<div><font size="2"> Thanks so much</font></div>
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<div><font size="2">Jim</font></div>