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4Â¥: Originally posted by llltom at 2015-05-29 12:26:04
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2Â¥2015-05-22 13:55:59
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clc;clear all;close all;
ts=0; %start time
te=5.12; %end time
n=2^12; %n points linearly spaced between and including ts and te
t=linspace(ts,te,n); %sampling time
fs=n/(te-ts); %%sampling frequency
fc=50; %carrier frequency
signal=sin(2*pi*fc*t); %sine signal
K=2.^(nextpow2(length(signal))); %fourier transform points
f=fs/2*linspace(0,1,K/2+1); %frequency
m=fft(signal,K)/fs;
M=abs(m(1:K/2+1)); %amplitude
figure;
plot(f,M);
xlabel('frequency/Hz')
ylabel('amplitude/V/Hz')
title('frequency spectrum')
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3Â¥2015-05-22 20:25:52
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llltom

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2Â¥: Originally posted by superjintao at 2015-05-22 13:55:59
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4Â¥2015-05-29 12:26:04
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