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Forum index » Science and Technology » Physics » Acoustics
Spreading in bark scale
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skromnibog@gmail.com
science forum beginner


Joined: 08 Apr 2006
Posts: 1

PostPosted: Sat Apr 08, 2006 8:50 am    Post subject: Spreading in bark scale Reply with quote
Dear group,

I am unable to get books from Zwicker, Terhardt and other relevant
books
about psychoacoustics. So I can not check one thing:
Frequency spreading used in ITU-R BS.1387 is based on Terhardt
"CALCULATING VIRTUAL PITCH":

24+230/fc+0.2*L db/Bark

Is this spreading based on assumption that exact bark scale is used, or
is
it based on assumption that bark scale aproximation by Terhardt is
used?

Please help.
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Angelo Campanella
science forum Guru Wannabe


Joined: 08 May 2005
Posts: 226

PostPosted: Tue Jul 11, 2006 9:11 pm    Post subject: Re: Spreading in bark scale Reply with quote
skromnibog@gmail.com wrote:
Quote:
about psychoacoustics. So I can not check one thing:
Frequency spreading used in ITU-R BS.1387 is based on Terhardt
"CALCULATING VIRTUAL PITCH":
24+230/fc+0.2*L db/Bark
Is this spreading based on assumption that exact bark scale is used, or
is it based on assumption that bark scale aproximation by Terhardt is
used?

Anyone:

Can they furnish a definition of "Bark"?...

I'd like to include it in the Acoustics FAQ file..

Angelo Campanella
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TheGhost
science forum addict


Joined: 09 Aug 2005
Posts: 85

PostPosted: Tue Jul 11, 2006 11:33 pm    Post subject: Re: Spreading in bark scale Reply with quote
Angelo Campanella <a.campanella@att.net> wrote in
news:kuUsg.365508$Fs1.268877@bgtnsc05-news.ops.worldnet.att.net:

Quote:
skromnibog@gmail.com wrote:
about psychoacoustics. So I can not check one thing:
Frequency spreading used in ITU-R BS.1387 is based on Terhardt
"CALCULATING VIRTUAL PITCH":
24+230/fc+0.2*L db/Bark
Is this spreading based on assumption that exact bark scale is used, or
is it based on assumption that bark scale aproximation by Terhardt is
used?

Anyone:

Can they furnish a definition of "Bark"?...

I'd like to include it in the Acoustics FAQ file..

Angelo Campanella


It's a pitch scale like the mel pitch scale. The scale ranges from 1 to 24
and corresponds to the first 24 critical bands of hearing. Do a google
search for bark scale and mel scale for the equations relating bark and mel
to frequency.
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Kari Pesonen
science forum beginner


Joined: 24 Jun 2005
Posts: 15

PostPosted: Wed Jul 12, 2006 6:59 am    Post subject: Re: Spreading in bark scale Reply with quote
"Angelo Campanella" <a.campanella@att.net> wrote in message
news:kuUsg.365508$Fs1.268877@bgtnsc05-news.ops.worldnet.att.net...
Quote:
skromnibog@gmail.com wrote:
about psychoacoustics. So I can not check one thing:
Frequency spreading used in ITU-R BS.1387 is based on Terhardt
"CALCULATING VIRTUAL PITCH":
24+230/fc+0.2*L db/Bark
Is this spreading based on assumption that exact bark scale is used, or
is it based on assumption that bark scale aproximation by Terhardt is
used?

Anyone:

Can they furnish a definition of "Bark"?...

I'd like to include it in the Acoustics FAQ file..

Angelo Campanella


We have two "schools", the Munich and Cambridge ones, that use little
different definitions or specifications concerning widths and numbers of
critical bands in "pitch/freq-domain".

The Munich school (Bark, Bark-rate), for example:
Zwicker E, Terhard E, Analytical expressions for critical-band rate
and cri­tical bandwidth as function of frequency, J. Acoust. Soc.
Am. 68(1980)5, 1523 - 1525.

The Cambridge school (Cam, "Cam-rate", "Cam-frequency"),
for example:
Moore B, Glasberg B, A revision of Zwicker's loudness model,
Acusti­ca/Acta Acustica, 82(1996)2, 335 - 345.

A note:
These differences have not been considered, for example, in the
tonality assessment method suggested in Annex C of ISO/DIS
1996:2.2:2005, Acoustics - Description, assessment and
measurement of environmental noise - Part 2: Determination
of environmental noise levels.
The draft differs from both the definitions above and is based on
detectability/audibility/prominence of tone/tones (the draft does
not consider how the degree/strength of tonality change noise
effects, like the prevalence of annoyance or sleep disturbances).

Kari Pesonen
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