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→‎Radio-frequency anechoic chambers: Add an image of a nice BIG one...lead mentions 'ones the size of aircraft hangars', well, this is it. :)
 
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[[Image:A440.png|thumb|A440 {{audio|A440.mid|Play}}. 440 Hz = 4.21 or 4.39]]


The '''Bark scale''' is a [[psychoacoustics|psychoacoustical]] [[scale (music)|scale]] proposed by [[Eberhard Zwicker]] in 1961. It is named after [[Heinrich Barkhausen]] who proposed the first subjective measurements of loudness.<ref name=ZwickerSubdivision>Zwicker, E. (1961), "[http://asadl.org/jasa/resource/1/jasman/v33/i2/p248_s1 Subdivision of the audible frequency range into critical bands]," ''The Journal of the Acoustical Society of America'', Volume 33, Issue 2, pp. 248-248 (1961)</ref>
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The scale ranges from 1 to 24 and corresponds to the first 24 [[critical band]]s of [[hearing (sense)|hearing]]. <ref>Julius O. Smith III and Jonathan S. Abel. "[https://ccrma.stanford.edu/~jos/bbt/Bark_Frequency_Scale.html The Bark Frequency Scale]", ''CCRMA.Stanford.edu''.</ref>
 
It is related to, but somewhat less popular than the [[mel scale]].
 
== Bark Scale Critical Bands ==
{| class="wikitable"
|-
! Number !! Center Frequency ([[Hertz|Hz]]) !! Cut-off Frequency ([[Hertz|Hz]]) !! Bandwidth ([[Hertz|Hz]])
|-
|    ||      ||    20 ||   
|-
|  1 ||    50 ||    100 ||    80
|-
|  2 ||  150 ||    200 ||    100
|-
|  3 ||  250 ||    300 ||    100
|-
|  4 ||  350 ||    400 ||    100
|-
|  5 ||  450 ||    510 ||    110
|-
|  6 ||  570 ||    630 ||    120
|-
|  7 ||  700 ||    770 ||    140
|-
|  8 ||  840 ||    920 ||    150
|-
|  9 ||  1000 ||  1080 ||    160
|-
|  10 ||  1170 ||  1270 ||    190
|-
|  11 ||  1370 ||  1480 ||    210
|-
|  12 ||  1600 ||  1720 ||    240
|-
|  13 ||  1850 ||  2000 ||    280
|-
|  14 ||  2150 ||  2320 ||    320
|-
|  15 ||  2500 ||  2700 ||    380
|-
|  16 ||  2900 ||  3150 ||    450
|-
|  17 ||  3400 ||  3700 ||    550
|-
|  18 ||  4000 ||  4400 ||    700
|-
|  19 ||  4800 ||  5300 ||    900
|-
|  20 ||  5800 ||  6400 ||  1100
|-
|  21 ||  7000 ||  7700 ||  1300 
|-
|  22 ||  8500 ||  9500 ||  1800
|-
|  23 || 10500 ||  12000 ||  2500
|-
|  24 || 13500 ||  15500 ||  3500
|}
Since the direct measurements of the critical bands are subject to error, the values in this table have been generously rounded.<ref name=ZwickerSubdivision/>
 
In his letter "Subdivision of the Audible Frequency Range into Critical Bands", Zwicker states:
<blockquote>
"These bands have been directly measured in experiments on the threshold for complex sounds, on masking, on the perception of phase, and most often on the loudness of complex sounds. In all these phenomena, the critical band seems to play an important role. It must be pointed out that the measurements taken so far indicate that the critical bands have a certain width, but that their position on the frequency scale is not fixed; rather, the position can be changed continuously, perhaps by the ear itself."
</blockquote>
Thus the important attribute of the Bark scale is the width of the critical band at any given frequency, not the exact values of the edges or centers of any band.
 
== Conversions ==
To convert a frequency ''f'' (Hz) into Bark use:
:<math>
\text{Bark} = 13 \arctan(0.00076f) + 3.5 \arctan((f/7500)^2) \,
</math>
 
or (Traunmüller 1990)<ref name=Traunmuller1990>{{Cite doi|10.1121/1.399849}}</ref>
:<math>
\text{Critical band rate  (bark)} = [(26.81 f) / (1960 + f )] - 0.53 \,
</math>
 
if result < 2 add 0.15*(2-result)<br>
if result > 20.1 add 0.22*(result-20.1)
:<math>
\text{Critical bandwidth (Hz)} = 52548 / (z^2 - 52.56 z + 690.39) \,
</math> with z in bark.
 
OR
f = 600*sinh(z/6)<ref>"[https://ccrma.stanford.edu/courses/120-fall-2003/lecture-5.html Sonification seminar - 10/9/03]", ''CCRMA.Stanford.edu''.</ref>
 
== See also ==
* [[Luminosity function]], which describes the average sensitivity of the human eye to ''light'' of different wavelengths.
* [[Fletcher–Munson curves]]
 
==References==
<references />
 
==External links==
*[http://citeseer.ist.psu.edu/smith99bark.html Smith and Abel - Bark and ERB Bilinear Transforms (1999)]
*[http://www2.ling.su.se/staff/hartmut/bark.htm Auditory scales of frequency representation]
 
{{Acoustics}}
 
{{DEFAULTSORT:Bark Scale}}
[[Category:Scales]]
[[Category:Psychoacoustics]]

Latest revision as of 14:32, 13 December 2014

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