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Re: AUDITORY Digest - 28 Aug 2006 (#2006-194)

Look at Beranek's book on Acoustics for info on this problem. I think I saw something in there the other day when I was scaning it, about angles in tubes, and the effects.

Jont Allen

AUDITORY automatic digest system wrote:
There are 2 messages totalling 185 lines in this issue.

Topics of the day:

  1. AUDITORY Digest - 18 Aug 2006 to 23 Aug 2006 (#2006-188)
  2. Perceptual Weighting filter in AMR-WB (or AMR-WB+)


Date:    Mon, 28 Aug 2006 05:43:11 -0700
From:    Abeer Alwan <abeera@xxxxxxxxxxxxx>
Subject: Re: AUDITORY Digest - 18 Aug 2006 to 23 Aug 2006 (#2006-188)

Mohan Sondhi 1986 JASA article (Apr. 79(4):1113-6) addresses
this issue. It shows that for typical vocal tract dimensions, the
bent causes a shift in resonant frequencies below 4 kHz in the
range of 2-8%.


  1. A question on area function of vocal tract (2)


Date:    Wed, 23 Aug 2006 13:18:25 -0400
From:    xinhui zhou <zxinhui@xxxxxxxxxxxx>
Subject: A question on area function of vocal tract

Dear List,

  I am having a question about area function of vocal tract,

  Area function is used to describe the vocal tract shape. It is
assumed that the bent shape of vocal tract can be regarded as a
straight tube with varying area along the axis,and only planar wave
propagation exists with limitation to certain frequency range.

 I only undertand it intuitively .  Is there any book or paper which
formuates the idea of area function , i.e. why a bent 3D shape can be
simplied as a tube with area function?

 Thanks in adavance,




Date:    Mon, 28 Aug 2006 22:03:12 +0800
From:    #ARIJIT BISWAS# <arijit17@xxxxxxxxxxxxxxxx>
Subject: Perceptual Weighting filter in AMR-WB (or AMR-WB+)

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Dear Members of the List:


I have a question regarding the "perceptual weighting filter" used in =
the AMR-WB (also in the AMR-WB+) codec that is standardized in 3GPP and =


Please check the 2002 Journal article from the developers of AMR-WB, =
where they present the perceptual filter (pages 8-10, and Figures 3 and =



Is this the best that one can achieve?=20

I would like to know if there are any recent research efforts made to =
improve this perceptual weighting filter to improve the quality of =
wideband speech. If so, any pointers in that direction will be highly =


Thanks in advance.


Best Regards,


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