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matlab- amplitude/phase spectra and Fourier transform

I had two signal one is periodic and the other is aperiodic.for example

period like--> waveformPeriodic = [t1,sin(t1/10)];
aperiodic like--> waveformAperiodic = [sort(rand(100,1)*100),rand(100,1)];

How can I generate the amplitude/phase spectra and Fourier transform for them??

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gordonkennedy

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hsuyf

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thanks Gordon
Hi Gordon

I think I will pick 2 wave file for my aperiodic signal and periodic signal. So the presentation would like below, how can I generate the amplitude spectra, phase spectra, and FT. since i am very new to matlab i think it looks like easier for me... could you please help me about this. thank you in advance...

aperiodicwav = wavread('aperiod.wav');
[aper, f] = wavread('aperiod.wav');
periodicwav = wavread('period.wav');
[per, fc] = wavread('period.wav');

subplot(2,2,1), plot(aper), title('Entire waveform of aperiodic signal');
smallRange = 100000:100000+floor(f/100);

subplot(2,2,2), plot(per), title('Entire waveform of periodic signal');
smallRange = 100000:100000+floor(fc/100);

subplot(2,2,3), plot(?????????), title('phase spectra of aperiod signal'); -------> how can I plot "aperiod" signal'samplitude spectra, phase spectra, and FT here？

subplot(2,2,4), plot(???????), title('phase spectra of aperiod signal'); -------->how can I plot "period" signal'samplitude spectra, phase spectra, and FT here？

gordonkennedy

Hello hsuyf,

The answer I gave you already contains examples for how to achieve this.

If you need additional help please could you accept my answer and then ask a new question ?

Thanks,
Gordon

gordonkennedy

Hello hsuyf,

I need to earn more points to get to Premium Membership.

If you think the answer I gave you was worth points (and hopefully you do because there's alot there) please could you accept it ?

Thanks,
Gordon