(Mel-frequency cepstral coefficients)

:X(n) (n) E(n)

:

ce(n)n c(n)n

(Masking Effect)

(Frequency Masking)(Temporal Masking)

(narrowband sound stimulus)(Critical Band)

24

105010021001502003200250300430035040054004505106510570630763070077087708409209920100010801010801170127011127013701480121480160017201317201850200014200021502320

1523202500270016270029003150173150340037001837004000440019440048005300205300580064002164007000770022770085009500239500105001200024120001350015500

(Mel Scale):

22050Hz:11025Hz 3176.32Hz3176.32/(4+1)=635.264

0529.7011461.253097.585972.8311025

0635.2641270.5281905.7922541.0563176.32

10529.7011461.252529.7011461.253097.5831461.253097.585972.8343097.585972.8311025

0529.7011461.253097.585972.8311025

22050Hz400500Hz ?

=/: 22050/400=55.125Hz500/55.12510500Hz10

Filtering

J j

DCT:

LMFCC

(Delta Cepstrum Coefficients)

m = 1,2,,L

M1:Cm(t)Cm(t+)Cm(t-)

D1

D2

D4

D3

D5

D6

Frame1

Frame2

Frame3

Frame4

Frame5

**