Bark

From Hydrogenaudio Knowledgebase
Revision as of 17:47, 17 January 2006 by HotshotGG (talk | contribs) (I have seen two ways to write the equation. This one should be fine. The Bark ranges might be well suited organized into a table.)

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.

(in Hz)

converting a f to it's bark equivalent:


Figure: Human hearing critical bands versus Layer 3 32 equal width subbands

Example: Widths of the critical bands gets wider towards the higher frequencies. MP3 32 equal width subbands (shown on top), based upon PQF filterbank cover the 22.05kHz bandwidth. The width of 1 MP3 subband is about . Ogg Vorbis uses Bark Scale mapping in it's filterbank decomposition. Both Bark and ERB bilinear transforms are equivalent in representing the critical bands of human auditory system.

Additional reading: