need data about tach signal?

greetings !! I want to know about tach signal(like signal from tachometer) in MATLAB and its generation in matlab like attached image(Might be aperiodic).. And i want to add some Gaussian noise to that signal to find frequency b/w peeks.

I tried using "pulse train" but not getting as i like..

Answer 1

[dpb]

Starting point could be something (from the pulstran example)...

>> t = 0 : 1/1e3 : 1;         % 1 kHz sample freq for 1 sec 
   d = 0 : 1/5 : 1;           % 5 Hz repetition freq 
   y = pulstran(t,d,@tripuls,0.01);
   plot(t,y)
>> xlim([-0.05 1.05])

You can then apply a windowing function of length(y) to desired shape to modify amplitude and add noise as desired. Fix up frequencies, etc., as desired, obviously; I just fiddled with the example parameters slightly to show more pulses over the same frequency as the example and with a symmetric pulse.

[LAKSHMAN]

Thanks for sharing ur knowledge..

Answer 2

[Xiaoxing Wang]

You can also get a tacho signal like this

fs = 1e3; %* sampling frequency
fr = 5; %* repetition frequency
t = 0:1/fs:1;
pulse = zeros(length(t),1);
idx = (fs/fr):(fs/fr):length(t);
idx = round(idx);
pulse(idx) = 1;