1 个投票

hi everyone.. i want to ask something..
this is my source code..
t=0:0.01:5;
num= [0 0 0.31185 8.28 55.2];
denum=[0.001088 0.044 0.69185 9.28 55.2];
sys=tf(num,denum);
step(sys,t)
grid
title ('Unit-Step Response')
xlabel('t')
ylabel('Amplitudo')
how to adding noise 15 dB to this coding? thanks for your help

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Greg Heath
Greg Heath 2012-1-16

1 个投票

I don't know about your coding. However, I add Gaussian noise to a noise free signal, s0, as follows
P0 = mean(s0.^2)
SNR = 10^(SNRdb/10)
s = s0 + sqrt(P0/SNR)*randn(size(s0));
Hope this helps.
Greg

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Souarv De
Souarv De 2019-7-21
What is s0?
anass naqqad
anass naqqad 2019-11-5
It's just the noise free signal

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