%?the?s-tranform?test?script
len?=?128;
freq?=?5;???
t?=?0:len-1;

%?CREATE?CROSS?CHIRP?TIME?SERIES
cross_chirp?=?cos（2*pi*（10+t/7）.*t/len）?+?cos（2*pi*（len/2.8-t/6.0）.*t/len）;
%?CREATE?MODULATED?SIN?FUNCTION?TIME?SERIES
mod_freq=4*cos（2*pi*t/len）+len/5;
sin_of_sin?=?cos（2*pi*mod_freq.*t/len）;
%?CREATE?the?Distinct?sinusoids?example
midfreq?=?20;
lowfreq?=?5;
highfreq?=?45;
distinct?=?cos（2*pi*midfreq.*t/len）;
distinct（1:len/2）?=?cos（2*pi*lowfreq.*t（1:len/2）/len）;
distinct（20:30）?=?cos（2*pi*highfreq?.*t（20:30）/len）;
%?CREATE?the?chirp?example
chirp?=?cos（2*pi*（10+t/7）.*t/len）;



[st_matrixst_timesst_frequencies]?=?st（sin_of_sin）;
[st_matrix_chirpst_timesst_frequencies]?=?st（chirp）;
[st_matrix_chirpsst_timesst_frequencies]?=?st（cross_chirp）;
[st_matrix_distinctst_timesst_frequencies]?=?st（distinct）;

contourf（st_timesst_frequenciesabs（st_matrix_chirps））;
%mesh（abs（st_matrix_chirp））;

?屬性????????????大小?????日期????時(shí)間???名稱
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?????文件????????936??2005-12-17?23:25??新建文件夾?（2）\stest.m

?????文件??????13710??2005-12-17?23:25??新建文件夾?（2）\stransform.m

?????目錄??????????0??2011-06-27?17:51??新建文件夾?（2）

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????????????????14646????????????????????3