An auditory scale of frequency representation, which takes into account that the bandwidth of auditory filters increases with centre frequency. To convert a frequency F in Hz to a Bark value the following formula is used: Bark=[(26.81*F)/(1960+F)]-0.53, and the following adjustments are made: if the result <2 add 0.15*(2-result), if the result >20.1 add 0.22*(result-20.1).