Filter

class neuxus.nodes.filter.ButterFilter(input_port, lowcut, highcut, order=4)

Bandpass filter for continuous signal

Attributes:

• output: output port

Args:

• input: get DataFrame and meta from input_ port

• lowcut (float): lowest frequence cut in Hz

• highcut (float): highest frequence cut in Hz

• order (int): order to be applied on the butter filter (recommended < 16),

• default value is 4

Example: ButterFilter(Port4, 8, 12, order=5)

class neuxus.nodes.filter.DownSample(input_port, downsampling_factor)

Downsample the signal after applying an anti-aliasing filter

Attributes:

• output (Port): output signal port of sampling frequency / factor

Args:

• input (Port): input signal port

• downsampling_factor (int): downsampling factor (recommanded under 13)

Example:

DownSample(port45, 5)

class neuxus.nodes.filter.NotchFilter(input_port, frequency_to_remove, quality_factor)

Band-stop filter with a narrow bandwidth (high quality factor). It rejects a narrow frequency band and leaves the rest of the spectrum little changed.

Attributes:

• output: output port

Args:

• input: get DataFrame and meta from input_ port

• frequency_to_remove(float): frequency to remove from the signal in Hz

• quality_factor(float): Dimensionless parameter that characterizes notch filter -3 dB bandwidth bw relative to its center frequency, Q = frequency_to_remove/bw

Example:

NotchFilter(Port4, 10, 0.8)