Bark: Difference between revisions

Revision as of 23:09, 26 November 2005

The bark is the standard unit corresponding to one of the 24 critical bands representing the width of human hearing system. Human hearing critical bands are narrow at low frequencies, but become wider at higher frequencies.

Band Edges:

0
100
200
300
400
510
630
770
920
1080
1270
1480
1720
2000
2320
2700
3150
3700
4400
5300
6400
7700
9500
12000
15500

converting a f to it's bark equivalent:

Bark = 13arctan(0.76f / 1000) + 3.5arctan((f / 7500)2)

Figure: Human hearing critical bands versus mp3's 32 equal width subbands

Example: Widths of the critical bands gets wider towards the higher frequencies. MP3's 32 equal width subbands (shown on top) cover the 22.05kHz bandwidth. The width of 1 MP3 subband is about 689Hz (32*689=22.05kHz).

@@ Line 1: / Line 1: @@
-The bark is the standard unit corresponding to one [[critical band]] width of human hearing. Human hearing critical bands are narrow at low [[frequency|frequencies]] but become wider at higher [[frequency|frequencies]].
+The bark is the standard unit corresponding to one of the 24 [[critical bands]] representing the width of human hearing system. Human hearing critical bands are narrow at low [[frequency|frequencies]], but become wider at higher [[frequency|frequencies]].
+Band Edges:
+* 0
+* 100
+* 200
+* 300
+* 400
+* 510
+* 630
+* 770
+* 920
+* 1080
+* 1270
+* 1480
+* 1720
+* 2000
+* 2320
+* 2700
+* 3150
+* 3700
+* 4400
+* 5300
+* 6400
+* 7700
+* 9500
+* 12000
+* 15500
+converting a ''f'' to it's bark equivalent:
+'''Bark = 13arctan(0.76f / 1000) + 3.5arctan((f / 7500)2)'''
 [[Image:Cribands.png|none|frame|Figure: Human hearing critical bands versus mp3's 32 equal width subbands]]
-Widths of the [[critical band|critical bands]] gets wider towards the higher [[frequency|frequencies]]. [[MP3]]'s 32 equal width [[subband|subbands]] (shown on top) cover the 22.05kHz [[bandwidth]]. The width of 1 [[MP3]] [[subband]] is about 689Hz (32*689=22.05kHz).
+Example: Widths of the [[critical band|critical bands]] gets wider towards the higher [[frequency|frequencies]]. [[MP3]]'s 32 equal width [[subband|subbands]] (shown on top) cover the 22.05kHz [[bandwidth]]. The width of 1 [[MP3]] [[subband]] is about 689Hz (32*689=22.05kHz).