Signal Analysis

  • Thread starter Hzaqa
  • Start date
  • #1
15
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Homework Statement


Hi ,
The problem is how to analysis this signal in terms of time segments to understnd the characteristics/pattern of this signal
146493896.png


Homework Equations



There is no relevant equtions

The Attempt at a Solution



I have tried to use :
RMS
Wavlet
FFT
But which one of them can give us a better understing of the system,

Thanks,

Homework Statement





Homework Equations





The Attempt at a Solution

 

Answers and Replies

  • #2
lewando
Homework Helper
Gold Member
1,352
138
Your problem statement is fairly unconstrained so--

For frequency analysis, consider making a spectrogram, a 3 dimensional graph (frequency vs amplitude vs time).

For amplitude analysis, experiment with various moving average (RMS) plots.
 
  • #3
gneill
Mentor
20,925
2,866
Presumably you have a data set that corresponds to the graph, and not just the graph alone? You might want to investigate the use of the Lomb-Scargle Periodogram method to tease out the underlying frequency components of the signal.
 
  • #4
15
0
Thanks for the response,


Well, I have applied frequency domain


Matlab code:

m=fft(x)
n=length(x)
power=abs(m(1:floor(n/2))).^2
nyquist=1/2
freq=((1:n/2)/(n/2)*nyquist)*5000
figure
plot(freq,power)
xlabel('Frequency (Hz)')
ylabel('Power')
title('Power Spectrum of Signal')
grid on
977009973.png


amp=abs(m(1:floor(n/2)))
figure
plot(freq,amp)
xlabel('Frequency (Hz)')
ylabel('Amplitude')
title('Amplitude Spectrum of Signal')
grid on
975500764.png





But I am not quite sure which one of them is best/correct,any suggestion,
Thanks
 

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