aspen.processings.filter_signal¶

Filter a signal

Functions

filter_signal(x, btype, filter_freq[, …])

Filter a signal.

Classes

FilterSignal(filter_signal_btype, …[, …])

Filter a signal.

class aspen.processings.filter_signal.FilterSignal(filter_signal_btype, filter_signal_filter_freq, filter_signal_impulse_response='fir', filter_signal_filter_order=None, filter_signal_firwindow='hann', samp_freq=16000)[source]¶

Bases: aspen.interfaces.abs_common_interface.AbsCommonInterface, aspen.interfaces.abs_processing_interface.AbsProcessingInterface

Filter a signal.

Parameters

filter_signal_btype¶ (str) – The type of filter.
filter_signal_filter_freq¶ (Union[str, float, ndarray]) – Cutoff frequency. In the case of bandpass or bandstop, specify the lower/upper freqencies splitted by the underscore symbol (e.g. 800_1200).
filter_signal_impulse_response¶ (str) – Type of impulse response of filter. Defaults to “fir”.
filter_signal_filter_order¶ (Optional[int]) – Number of the filter order. Defaults to “None”. This means that the filter order set 512 for fir and 2 for iir, respectively.
filter_signal_firwindow¶ (str) – Type of FIR window for filtering noise. Window function is listed in Scipy doc. (https://docs.scipy.org/doc/scipy/reference/signal.windows.html) Use only when impulse-response=fir”. Defaults to “hann”.
samp_freq¶ (int) – Sampling frequency. Defaults to 16000.

__call__(x)[source]¶

Apply signal filtering

Parameters: x¶ (ndarray) – Input signal
Return type: ndarray
Returns: Output signal

static add_arguments(parser)[source]¶: add arguments

classmethod load_class_kwargs(args)¶

Return the kwargs dict for class __init__ from parsed arguments

Parameters: args¶ (Namespace) – (config)argparse arguments
Return type: dict
Returns: kwargs for class __init__

aspen.processings.filter_signal.filter_signal(x, btype, filter_freq, impulse_response='fir', filter_order=None, firwindow='hann', samp_freq=16000)[source]¶

Filter a signal.

Parameters

x¶ (ndarray) – Input signal
btype¶ (str) – The type of filter.
filter_freq¶ (Union[str, float, ndarray]) – Cutoff frequency. In the case of bandpass or bandstop, specify the lower/upper freqencies splitted by the underscore symbol (e.g. 800_1200).
impulse_response¶ (str) – Type of impulse response of filter. Defaults to “fir”.
filter_order¶ (Optional[int]) – Number of the filter order. Defaults to “None”. This means that the filter order set 512 for fir and 2 for iir, respectively.
firwindow¶ (str) – Type of FIR window for filtering noise. Window function is listed in Scipy doc. (https://docs.scipy.org/doc/scipy/reference/signal.windows.html) Use only when impulse-response=fir”. Defaults to “hann”.
samp_freq¶ (int) – Sampling frequency. Defaults to 16000.

Return type

ndarray

Returns

Output signal