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

Subject: Re: AUDITORY Digest - 28 Aug 2006 (#2006-194)
From:    Jont Allen  <jontalle@xxxxxxxx>
Date:    Tue, 29 Aug 2006 21:38:54 -0500

Xinhui
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@xxxxxxxx>
> 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%.
> 
> Regards,
> Abeer
> 
>>   1. A question on area function of vocal tract (2)
>>
>> ----------------------------------------------------------------------
>>
>> Date:    Wed, 23 Aug 2006 13:18:25 -0400
>> From:    xinhui zhou <zxinhui@xxxxxxxx>
>> 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,
>>
>> Xinhui
>>
>> ------------------------------
>>
> 
> ------------------------------
> 
> Date:    Mon, 28 Aug 2006 22:03:12 +0800
> From:    #ARIJIT BISWAS# <arijit17@xxxxxxxx>
> Subject: Perceptual Weighting filter in AMR-WB (or AMR-WB+)
> 
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> Dear Members of the List:
> 
> =20
> 
> 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 =
> ITU.=20
> 
> =20
> 
> 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 =
> 4).
> 
> http://www.gel.usherbrooke.ca/audio/docs/IEEE2002_Bessette.pdf#search=3D%=
> 22perceptual%20weighting%20filter%20AMR%20WB%22=20
> 
> =20
> 
> 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 =
> appreciated.
> 
> =20
> 
> Thanks in advance.
> 
> =20
> 
> Best Regards,
> 
> ~Arijit
> 
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