How to play Maximum length sequence twice?

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catarina
catarina 2012-3-22
Hello,
I need some help with maximum length sequence. My tutor gaves us a code with a transfer function measurement made with noise using the cross spectra equation Sxy/(Sxx*Sxy) where x and y are the input and output respectively. But I'm suppose to find out how to the measurement more accurate. I know I'm suppose to use maximum length sequence and from what I understand (correct me if i'm wrong) I should play the mls signal twice (2 periods) and use the second period to compute the calculation. Although I can't figure it out how do do the code to play the sequence twice. Signal, mls sequence and filter are underneath:
N = 1023;
[x fs bits] = wavread('mls1023'); %read in mls signal, input signal in x
[b,a] = cheby1(9,0.5,0.7,'High'); %generate a LTI system (a simple filter)
y = filter(b,a,x); %pass signal through LTI system
Thanks for any help in advance...
Catarina

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回答（1 个）

Geoff
Geoff 2012-3-23
If you just want to repeat your signal you can append a copy like this (assuming single-row vector):
x = [x x];
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catarina
catarina 2012-3-23
Hi Geoff,
Thanks for this. How do I write the code to play the second part of the signal, being the first period to excite the filter and the second do compute the calculations?
Cheers
Catarina

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