Compute "period" of rectangle signal

[hellboy]

I have input rectangle signal with noise. Period T < 10 seconds.

I need to compute dynamically how long time highest and lowest vaues.

Signal changes from highest to lowest and from lowest to highest value immediatelly(<0,05 sec).

[hellboy]

Code in C-style language:

x(t) - square-formed function

x0 - treshold value

t_beg_min = t_cur;

t_beg_max = t_cur;

FindMax = true;

FindMin = false;

if ((x_cur>x0) and FindMax)  {

  Time_min = t_cur - t_beg_min; ->OUTPUT

  t_beg_max = t_cur;

FindMax = false;

FindMin =  true;

}

if ((x_cur<x0) and FindMin)  {

  Time_max = t_cur - t_beg_may; ->OUTPUT

  t_beg_min = t_cur;

FindMax = true;

FindMin = false;

}

[hellboy]

I found solution:

http://www.labviewforum.de/index.php?showtopic=976&hl=Timingmessung