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

[Ivan Dimkovic]

Hi,
"BVAL" value represents mean value in bark scale of the specified
partition - i.e. this is the frequency in bark units of the middle of the
partition. For bark units, you need to consult some psychoacoustic books - I
suggest to take a look at Zwicker's publications.
Bark scale is non-linear frequency scale (and Hz is linear frequency scale)
and Bark units correlate to bandpass frequencies of human hearing - there
are several approximation formulas for conversion of Hertz (Hz) to Bark.
Take a look at google for these.
Best regards / Mit freundlichen Gr¨¹?en
Ivan Dimkovic
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Ivan Dimkovic
MPEG-4 Software R&D
Ahead Software AG phone: +49 (0)7248 911 822(direct line)
Im Stoeckmaedle 18 fax: +49 (0)7248 911 888
76307 Karlsbad email: idimkovic   nero.com
Germany web: www.nero.com
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-----Original Message-----
From: technotes-admin   lists.m4if.org
[mailto:technotes-admin   lists.m4if.org]On Behalf Of hanxy
Sent: Monday, August 26, 2023 4:51 AM
To: technotes   lists.m4if.org
Subject: [M4IF Technotes] Can anyone explain "bval" in psychoacoustic model
in detail?
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