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liulbcd

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[ÇóÖú] ÈçºÎÓÃMatlab¶Ôº¯Êýsin(pi*t)/(pi*t)½øÐÐFFT±ä»» ÒÑÓÐ2È˲ÎÓë

ÈçÌ⣬±¾ÈËÏÖÔÚÏëÀûÓÃMatlabµÄFFTº¯Êý¶Ôsin(pi*t)/(pi*t)½øÐиµÀïÒ¶±ä»»£¬Í¨¹ýÊé±¾µÃµ½Æä¸µÀïÒ¶±ä»»Ó¦Îª-piµ½piΪ1£¬ÆäÓàÆµÂʳɷÖΪ0. µ«±¾ÈËÀûÓÃÈçϳÌÐò×ÜÊǵò»µ½ÕýÈ·½á¹û£¬·³Çë´ó¼ÒÖ¸Õý¡£Ð»Ð»¡£

clc
clear
Fs=1000;
T=1/Fs;
L=1000;
t=(1:L-1)*T; %ÕâÒ»²½²»´Ó0ȡֵÊÇΪÁËy=sin(pi*t)./pi./tÔÚÕû¸öt·¶Î§ÄÚÓÐÖµ
L=size(t);
L=L(1,2);
y=sin(pi*t)./pi./t;
NFFT=2^nextpow2(L);
Y=fft(y,NFFT)/L;
f=Fs/2*linspace(0,1,NFFT/2+1);
plot(f,2*abs(Y(1:NFFT/2+1)))
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fanlet

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liulbcd

Ìú³æ (СÓÐÃûÆø)

ÒýÓûØÌû:
2Â¥: Originally posted by fanlet at 2014-09-27 13:20:54
ÏÈ»­³öy=sin(pi*t)./pi./t;
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3Â¥2014-09-27 13:28:02
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liulbcd

Ìú³æ (СÓÐÃûÆø)

ÒýÓûØÌû:
2Â¥: Originally posted by fanlet at 2014-09-27 13:20:54
ÏÈ»­³öy=sin(pi*t)./pi./t;
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ÈçºÎÓÃMatlab¶Ôº¯Êýsin(pi*t)/(pi*t)½øÐÐFFT±ä»»
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4Â¥2014-09-27 13:29:05
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liulbcd

Ìú³æ (СÓÐÃûÆø)

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5Â¥2014-09-27 13:32:17
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ÒýÓûØÌû:
5Â¥: Originally posted by liulbcd at 2014-09-27 13:32:17
Matlab×öFFTÒª¶ÔʱÓòº¯ÊýÓÐʲôҪÇóÂð£¿

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