[M4IF Technotes] Can anyone explain "bval" in psychoacoustic model in detail?

[hanxy]

Hi, All, the description of "bval" in psychoacoustic model of MPEG-4 AAC is "the median bark value of the specific partion", I don't know the physical meaning of it. So, Can you do me a favor to explain it in detail?
Thanks in advance.
your secerely
Speer Han
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