function?[GtR]?=?GCC（mPxxPyyPxyFsframeN）
%GCC
%?Generalized?Cross-Correlation?with?specified?pre-whitening?filter.
%
%?Description:?the?GCC?is?computed?with?a?pre-whitening?filter?onto?the
%??????????????cross-power?spectrum?in?order?to?weight?the?magnitude?value
%??????????????against?its?SNR.?The?weighted?CPS?is?used?to?obtain?the
%??????????????cross-correlation?in?the?time?domain?with?an?inverse?Fourier
%??????????????transformation.?The?result?is?normalized?between?[-1?1].
%
%?Usage??????:?G?=?GCC（mPxxPyyPxy）
%??????????????[Gt]?=?GCC（mPxxPyyPxyFsframe）
%??????????????[Gt]?=?GCC（mPxxPyyPxyFsframeN）
%??????????????[GtR]?=?GCC（...）
%
%?m????????????pre-whitening?filter?type
%??????????????（‘Roth‘‘SCOT‘‘PHAT‘‘CPS-m‘‘HT‘‘unfiltered‘）
%?PxxPyyPxy??power?spectra?of?the?input?signal.?If?PxxPyyPxy?are
%??????????????matrices?each?column?represent?the?power?spectrum?for?the
%??????????????relative?channel?involved?in?the?Pxy?calculus:
%??????????????（i.e.?Pxx?contains?power?spectrum?for?channel?（1）?（1）?（2）
%??????????????Pyy?contains?power?spectrum?for?channel?（2）?（3）?（3）?so?Pxy
%??????????????contains?the?cross?power?spetrum?for?the?couples?（12）?（13）
%??????????????（23））
%?Fs???????????sampling?frequency?（Hz）
%?frame????????length?in?samples?of?the?input?sequence?from?which?were
%??????????????extracted?the?power?spectra.?It‘s?used?to?compute?the?time
%??????????????ticks
%?N????????????[optional]?FFT?length.?By?default?Pxy?length
%
%?G????????????vector?of?GCC?values
%??????????????matrix?of?GCC?values?on?columns?when?Pxy?is?a?matrix
%?t????????????[optional]?vector?with?time?ticks?for?the?GCC
%??????????????[optional]?vector?of?frequencies?GCC?values
%?R????????????matrix?of?frequencies?GCC?values?where?columns?are?GCC?for
%??????????????the?respective?channel
%
%
%?Author?????:?Davide?Renzi?d.renzi@infocom.uniroma1.it
%??????????????INFOCOM?Dept.?University?of?Rome?“La?Sapienza“
%?Version????:?2.0
%?Date???????:?Rome?June?2005
%
%
%???This?program?is?free?software;?you?can?redistribute?it?and/or?modify
%???it?under?the?terms?of?the?GNU?General?Public?License?as?published?by
%???the?Free?Software?Foundation;?either?version?2?of?the?License?or
%???（at?your?option）?any?later?version.
%
%???This?program?is?distributed?in?the?hope?that?it?will?be?useful
%???but?WITHOUT?ANY?WARRANTY;?without?even?the?implied?warranty?of
%???MERCHANTABILITY?or?FITNESS?FOR?A?PARTICULAR?PURPOSE.??See?the
%???GNU?General?Public?License?for?more?details.


%?check?input?arguments
if?nargout==1?&?nargin<4
????error（‘Wrong?number?of?input?arguments‘）;
elseif?nargout==2?&?nargin<6
????error（‘Wrong?number?of?input?arguments?to?compute?time?ticks‘）;
elseif?nargin<7
????N?=?size（Pxy1）;
end


%?number?of?channels
Nchn?=?size（Pxy2）;

%?define?pre-whitening?filter
switch?lower（m）
????case?‘unfiltered‘
????????%?Unfiltered?Cross-Correlation?（UCC）
????????%?-----------

?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----
?????文件????????7002??2008-10-13?10:05??GCC.m
?????文件????????1001??2014-08-12?11:06??廣義互相關.m