th_butter

Four-pole Butterworth filter.

Syntax

th_butter(xvect, yvect, lowfreq, octave, debug_flag)

Arguments

xvect
The time vectors (seconds).
yvect
Response vectors to be filtered (any units).
lowfreq
Low Frequency (Hz).
octave
Can be 3 or 6.
debug_flag
Optional argument. Flag to turn on debug mode (points to message log). Default is off.

Example

th_butter(p1w1c1.x, p1w1c1.y, 0.02, 6)

Comments

4−pole Butterworth filter is a low−pass filter, which means that high frequencies are filtered.

Equivalent filters in TH++ are:
  • LOW PASS 4-poles Butterworth (-3db)
  • LOW PASS 4-poles Butterworth (-6db)