function?[?CC?FBE?frames?]?=?mfcc（?speech?fs?Tw?Ts?alpha?window?R?M?N?L?）
%?MFCC?Mel?frequency?cepstral?coefficient?feature?extraction.
%
%???MFCC（SFSTWTSALPHAWINDOWRMNL）?returns?mel?frequency?
%???cepstral?coefficients?（MFCCs）?computed?from?speech?signal?given?
%???in?vector?S?and?sampled?at?FS?（Hz）.?The?speech?signal?is?first?
%???preemphasised?using?a?first?order?FIR?filter?with?preemphasis?
%???coefficient?ALPHA.?The?preemphasised?speech?signal?is?subjected?
%???to?the?short-time?Fourier?transform?analysis?with?frame?durations?
%???of?TW?（ms）?frame?shifts?of?TS?（ms）?and?analysis?window?function?
%???given?as?a?function?handle?in?WINDOW.?This?is?followed?by?magnitude?
%???spectrum?computation?followed?by?filterbank?design?with?M?triangular?
%???filters?uniformly?spaced?on?the?mel?scale?between?lower?and?upper?
%???frequency?limits?given?in?R?（Hz）.?The?filterbank?is?applied?to?
%???the?magnitude?spectrum?values?to?produce?filterbank?energies?（FBEs）?
%???（M?per?frame）.?Log-compressed?FBEs?are?then?decorrelated?using?the?
%???discrete?cosine?transform?to?produce?cepstral?coefficients.?Final
%???step?applies?sinusoidal?lifter?to?produce?liftered?MFCCs?that?
%???closely?match?those?produced?by?HTK?[1].
%
%???[CCFBEframeS]=MFCC（...）?also?returns?FBEs?and?windowed?frames
%???with?feature?vectors?and?frames?as?columns.
%
%???This?framework?is?based?on?Dan?Ellis‘?rastamat?routines?[2].?The?
%???emphasis?is?placed?on?closely?matching?MFCCs?produced?by?HTK?[1]
%???（refer?to?p.337?of?[1]?for?HTK‘s?defaults）?with?simplicity?and?
%???compactness?as?main?considerations?but?at?a?cost?of?reduced?
%???flexibility.?This?routine?is?meant?to?be?easy?to?extend?and?as?
%???a?starting?point?for?work?with?cepstral?coefficients?in?MATLAB.
%???The?triangular?filterbank?equations?are?given?in?[3].
%
%???Inputs
%???????????S?is?the?input?speech?signal?（as?vector）
%
%???????????FS?is?the?sampling?frequency?（Hz）?
%
%???????????TW?is?the?analysis?frame?duration?（ms）?
%?
%???????????TS?is?the?analysis?frame?shift?（ms）
%
%???????????ALPHA?is?the?preemphasis?coefficient
%
%???????????WINDOW?is?a?analysis?window?function?handle
%?
%???????????R?is?the?frequency?range?（Hz）?for?filterbank?analysis
%
%???????????M?is?the?number?of?filterbank?channels
%
%???????????N?is?the?number?of?cepstral?coefficients?
%?????????????（including?the?0th?coefficient）
%
%???????????L?is?the?liftering?parameter
%
%???Outputs
%???????????CC?is?a?matrix?of?mel?frequency?cepstral?coefficients
%??????????????（MFCCs）?with?feature?vectors?as?columns
%
%???????????FBE?is?a?matrix?of?filterbank?energies
%???????????????with?feature?vectors?as?columns
%
%???????????frameS?is?a?matrix?of?windowed?frames
%??????????????????（one?frame?per?column）
%
%???Example
%???????????Tw?=?25;???????????%?analysis?frame?duration?（ms）
%???????????Ts?=?10;???????????%?analysis?frame?shift?（ms）
%???????????alpha?=?0.97;??????%?preemphasis?coefficient
%???????????R?=?[?300?3700?];??%?frequency?range?to?

?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----
?????文件????????7190??2018-04-21?21:05??mfcc.m
?????文件????????4797??2018-04-21?21:19??trifbank.m
?????文件???????10707??2018-04-23?16:30??untitled.fig
?????文件????????9006??2018-04-23?16:30??untitled.m
?????文件????????6993??2018-04-21?21:19??vec2frames.m
?????文件???????65587??2019-05-28?20:16??語音情感識別代碼matlab.rtf