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find pulsed trigger events


Deborah (view profile)


The function finds the start of pulsed events in a signal via a trigger limit.

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I had the problem of needing to find an unknown number of pulses in a signal, but I knew the pulse rate and the approximate length of the pulses (but there could be some missing). This function has a trigger with downtime functionality and will find all events with a given trigger level.

% Example 1
% generate signal with two pulses of random noise:
sig = [zeros(1,200) .5-rand(1,20) zeros(1,200) .5-rand(1,20)];
fs = 440;
level = .02;
prate = 2;
triggerindex = get_trigger(sig, level, fs, prate, 'r');
% make it visible:
plot(sig); hold on
plot(triggerindex, sig(triggerindex), 'or')

I wrote this some time ago and I know it could be made more efficient, but for the signal lengths I'm dealing with it works okay. But feel free to post some improvements.

Required Products MATLAB
MATLAB release MATLAB 7.11 (R2010b)
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