Spectrum Viewer documentation

Smooth g RC Filter g Low Pass

Applies a RC Low Pass filter using the following formula:

Y_out,i = Alpha * Y_in,i+ (1 - Alpha) * Y_out,i-1

Alpha = DT / (RC + DT)

DT = X_i - X_i-1

Smooth g RC Filter g High Pass

Applies a RC High Pass filter using the following formula:

Y_out,i = Alpha * Y_out,i-1 + Alpha * (Y_in,i- Y_in,i-1)

Alpha = RC / (RC + DT)

DT = X_i - X_i-1

For both filters you only have to specify the RC factor. Alpha is calculated for each datapoint separately, using the X-distance of the current datapoint to the previous datapoint. For a correct sample frequency calculation X needs to be in seconds (X=6 means t = 6 seconds).