aspen.processings.extract_envelope¶

Extract envelope

Functions

extract_envelope(x[, method, lpf_freq, …])

Extract the envelope from a signal

Classes

ExtractEnvelope([extract_envelope_method, …])

Extract the envelope from a signal

class aspen.processings.extract_envelope.ExtractEnvelope(extract_envelope_method='rect', extract_envelope_lpf_freq=16.0, extract_envelope_lpf_impulse_response='fir', extract_envelope_lpf_filter_order=512, extract_envelope_lpf_fir_window='hann', samp_freq=16000)[source]¶

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

Extract the envelope from a signal

Parameters

extract_envelope_method¶ (str) – Extracting method of envelope. Defaults to “rect”.
extract_envelope_lpf_freq¶ (float) – Frequency of low-pass filter. Defaults to 16.0.
extract_envelope_lpf_impulse_response¶ (str) – Impulse response for low-pass filter. Defaults to “fir”.
extract_envelope_lpf_filter_order¶ (int) – Filter order of low-pass filter. Defaults to 512.
extract_envelope_lpf_fir_window¶ (str) – Window function for low-pass filter. Use only when lpf-impulse-response=fir. Defaults to “hann”.
samp_freq¶ (int) – Sampling frequency. Defaults to 16000.

__call__(x)[source]¶

Apply envelope extracting

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.extract_envelope.extract_envelope(x, method='rect', lpf_freq=16, lpf_impulse_response='fir', lpf_filter_order=512, lpf_fir_window='hann', samp_freq=16000)[source]¶

Extract the envelope from a signal

Parameters

x¶ (ndarray) – Input signal
method¶ (str) – Extracting method of envelope. Defaults to “rect”.
lpf_freq¶ (float) – Frequency of low-pass filter. Defaults to 16.0.
lpf_impulse_response¶ (str) – Impulse response for low-pass filter. Defaults to “fir”.
lpf_filter_order¶ (int) – Filter order of low-pass filter. Defaults to 512.
lpf_fir_window¶ (str) – Window function for low-pass filter. Use only when lpf-impulse-response=fir. Defaults to “hann”.
samp_freq¶ (int) – Sampling frequency. Defaults to 16000.

Return type

ndarray

Returns

Output signal