Digital Signal Processing Reference
In-Depth Information
Band Lowest Highest Width of
number frequency frequency critical band
1
20
100
80
2
100
200
100
3
200
300
100
4
300
400
100
5
400
510
110
6
510
630
120
7
630
770
140
8
770
920
150
9
920
1080
160
10
1080
1270
190
11
1270
1480
210
12
1480
1720
240
13
1720
2000
280
14
2000
2320
320
15
2320
2700
380
16
2700
3150
450
17
3150
3700
550
18
3700
4400
700
19
4400
5300
900
20
5300
6400
1100
21
6400
7700
1300
22
7700
9500
1800
23
9500
12000
2500
24
12000
15500
3500
25
15500
Tab l e 7 . 3 .
Critical bands. Frequencies are expressed in Hz
In this table, the 24 critical bands are put next to one another. In fact, the ear
can create a critical band around any frequency. The relation between a frequency
expressed in Hz in the range [20 Hz-20 kHz] and a frequency expressed in Bark in
the range [1-24] can be approximately expressed as follows:
arctg
f
H
7500
2
arctg
0
.
76
f
H
1000
+3
.
5
f
B
=13
×
×
7.5.4.
Masking curves
The ear has the property of not perceiving a sound in the presence of another
sound provided that the characteristics of the two sounds have a particular relation.
This is the
masking phenomenon
. There are two types of masking of one sound by
