t=0.1:1/1846220:(10/500000+0.1); %simple rate T=1/1846220 sec,means that sample four point in a circle!<br />yt=0.25*sin(2*500000*pi*t)+0.950; %f=500KHz ,create 37 sample point<br />figure<br />stem(yt); % the figure that have four 3.**? per circle<br />title('37 sample point')<br />sp=fft(yt);<br />figure<br />stem(sp);<br />title('|X(k)| of yt')<br /><br />变换本在频域应用有0.95*37=35.15(yt=0.25*sin(2*500000*pi*t)+0.950; )的直流分量的,但看不到,请赐教,如图: |
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