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# pls i need a code that can be used to detect the peak of signal (peak detector)

pls i need a code that can be used to detect the peak of signal (peak detector)

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Answer by Wayne King on 19 Jun 2013

Do you have the Signal Processing Toolbox, have you looked at findpeaks()?

No, i have no signal processing toolbox. can you pls tell me how to access it. I am relatively new in the field.

## 1 Comment

Jan Simon on 19 Jun 2013

You'd have to buy this toolbox from MathWorks.

Answer by Jan Simon on 19 Jun 2013

Did you search in the FileEchange already?

http://www.mathworks.com/matlabcentral/fileexchange/index?utf8=%E2%9C%93&term=find+peaks

You find a very large number of solutions for standard and non-standard problems there.

bala sadiq on 20 Jun 2013

thank you, i am grateful your advice have really work for me.

Jan Simon on 20 Jun 2013

If it works, accepting the answer would be a signal for others, that you do not need further suggestion.

bala sadiq on 20 Jun 2013

i used the following code to call a function that detect the peaks of a signal spectra generated. How do i display the values of these peaks. Pls i need your help.

figure % Plot peaks of the spectrum. [peaks, locs] = findpeaks (2*abs(OutputSignal(1:NFFT/2))) plot (2*abs(OutputSignal(1:NFFT/2))); hold on; plot (locs, peaks, 'r')

Answer by Image Analyst on 20 Jun 2013

Here's one that doesn't need any toolbox. Go to the web site indicated:

```%  Eli Billauer, 3.4.05 (Explicitly not copyrighted).
%  http://billauer.co.il/peakdet.html
%  This function is released to the public domain; Any use is allowed.
```