BSL PRO Software Guide - Biopac

104 Part C6) The following stipulations dictate the Rate Detector options available:a) If the Remove baseline option is selected, the Auto threshold detect option is also selected.b) The Auto threshold detect feature can be used independently of the Remove baseline option.c) The Noise rejection setting and the Window setting are automatically enabled when the Auto thresholddetect option is selected.d) The Remove baseline option is disabled when the following measurements are chosen:Peak-Peak, Peak Maximum, Peak Minimum, Area, and Mean.e) The Auto threshold detect option creates a variable threshold for positive or negative peak detection,defined as follows:Positive peaks: (Peak max - Peak Min)(.75)Negative peaks: (Peak max – Peak Min)(.25)In addition, the Rate Detector will construct a moving average of data points defined by 1.5 times the number ofsamples that can be placed in the largest Window size (time). When the Rate detector loses sync (no thresholdcrossing inside the Window) the threshold is changed to the mean value of the moving average of data points.This operation permits successful recovery in the event of spurious waveform data values.f) The Noise rejection setting creates hysteresis around the variablethreshold as follows:Hysteresis = Noise rejection (%) (Peak Max – Peak Min)g) The Remove baseline option combined with the Auto threshold detect option causes the Rate Detector toperform an automatic (and hidden) moving difference function on the waveform data:(0.025)(sampling rate) = Number of points over which the difference is performedThe difference waveform is then processed as previously described under the Auto Threshold detect option.h) The sample rate must be greater than 40 samples/second for remove baseline and auto-threshold detect tofunction properly.Visit the online support center at www.biopac.com