Pre-emphasis The high concentration of energy in the ow frequency range observed for most speech spectra is considered a nuisance because it makes less relevant the energy of the signal at middle and high frequencies in many speech analysis algorithms. From Vergin, R etal. Compensated mel frequency cepstrum coefficients", IEEE, ICASSP 96.1996 Feature extraction v 9aPre-emphasis • “ The high concentration of energy in the low frequency range observed for most speech spectra is considered a nuisance because it makes less relevant the energy of the signal at middle and high frequencies in many speech analysis algorithms.” • From Vergin, R. etal. ,“"Compensated mel frequency cepstrum coefficients ", IEEE, ICASSP- 96. 1996 . Feature extraction, v.9a 19