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0000000154
2014 Mar 20
2
BARK implementation (or specification) error
...e course of some work which I describe below, I have found a very significant difference between the BARK function described in the Vorbis specification and its implementation in libvorbis.
In the specificationhttp://xiph.org/vorbis/doc/Vorbis_I_spec.pdf
bark(x) = 13.1arctan(.00074x) + 2.24arctan(.0000000185x**2 + .0001x)
In the libvorbis code http://svn.xiph.org/trunk/vorbis/lib/scales.h
#define toBARK(n) (13.1f*atan(.00074f*(n))+2.24f*atan((n)*(n)*1.85e-8f)+1e-4f*(n))
You will note that the last term is inside the parentheses of the second arctan function in the specification but outside in the li...