physioex.data.NotchFilter

class physioex.data.NotchFilter(freq=50.0, quality=30.0)

Bases: PreprocessingStep

IIR notch filter (powerline removal).

Uses second-order sections (SOS) for numerical stability on long signals.

If the notch frequency is out of range (freq >= Nyquist), returns the unfiltered signal with a warning instead of raising an error.

Parameters:

• freq (float)

• quality (float)

__init__(freq=50.0, quality=30.0)

Parameters:

• freq (float)

• quality (float)

Methods

__init__([freq, quality])
compile(fs_in)	Precompute any expensive state and return a callable specialized for fs_in.
spec()	Return canonical, hashable text repr.

compile(fs_in)

Precompute any expensive state and return a callable specialized for fs_in.

Parameters:

fs_in (float)

Return type:

CompiledStep

spec()

Return canonical, hashable text repr.

Format: ClassName(key1=val1,key2=val2,…) with sorted keys, floats normalized via f’{float(v):.10g}’.

Return type:

str