Apply a second-order Butterworth-style low-pass filter to pulse/PPG data

Apply a second-order Butterworth-style low-pass filter to pulse/PPG data

Usage

filter_gazepoint_ppg_butterworth(
  x,
  cutoff_hz = 5,
  sampling_rate_hz,
  passes = 1L
)

Arguments

x

Numeric signal.

cutoff_hz

Low-pass cutoff frequency in Hz.

sampling_rate_hz

Sampling rate in Hz.

passes

Number of repeated two-pole sections.

Value

Filtered numeric signal.