jens
b31f3e7435
git-svn-id: http://moon:8086/svn/matlab/trunk@153 801c6759-fa7c-4059-a304-17956f83a07c
20 lines
1.1 KiB
Matlab
Executable File
20 lines
1.1 KiB
Matlab
Executable File
% ##################################################################################
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% ## Loesung: Spektraltransformation reeller Bandpass-Signale ##
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% ## -------------------------------------------------------------------------- ##
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% ## Benoetigte(s) m-File(s): lband.m ##
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% ##################################################################################
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NFFT = 2^10;
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b1 = lband(1000,0.2,0.02); fT = 0:1/NFFT:1-1/NFFT;
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% Originalsignal
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b2 = b1; lb = length(b2); aB2_hn=abs(fft(b2.*hanning(lb),NFFT));
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figure; plot(fT, aB2_hn); axis([0 1 0 1.1*max(aB2_hn)]); xlabel('Omega/2pi = f T');
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ylabel('|B(exp(j*Omega))|');
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for k=[9 10 11 12] %Unterabtastung um Faktor k
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b2 = b1(1:k:1000); lb = length(b2); aB2_hn=abs(fft(b2.*hanning(lb),NFFT));
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figure; plot(fT,aB2_hn); axis([0 1 0 1.1*max(aB2_hn)]); xlabel('Omega/2pi = f T');
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ylabel('|B_M(exp(j*Omega))|'); title(sprintf('Unterabtastung um Faktor M=%d',k));
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end;
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% ##### EOF #####
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