meas_fall :
Measurement of the time instants of xreal-typed signal’s falling events.

The meas_fall primitive measures the time instants when an xreal-typed signal in has the (N+k*P)-th event falling below a given threshold after a specified delay, where k is 0, 1, 2, and so on. The output is a real-typed value indicating the absolute time of each event. The threshold, triggering count N, period P, and delay are defined by the parameters threshold, times, period, and delay, respectively. When the parameter times is less than or equal to 0, the primitive updates the measurement whenever in falls below the threshold after the delay. It is equivalent to the meas_cross primitive with the parameter direction set to -1.

Input/Output Terminals

Name	I/O	Type	Description
out	output	real	measurement output
in	input	xreal	input signal

Parameters

Name	Type	Default	Unit	Description
threshold	real	0.0	None	threshold level
delay	real	0.0	seconds	triggering delay
times	integer	0	None	triggering count
period	integer	0	None	triggering period