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Your handy frequency and impulse response processing object

Project description

Response

Your handy frequency and impulse response processing object!

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This module supplies the Response class: an abstraction of frequency and impulse responses and a set of handy methods for their processing. It implements a fluent interface for chaining the processing commands.

Find the documentation here and the source code on GitHub.

import numpy as np
from response import Response

fs = 48000  # sampling rate
T = 0.5     # length of signal
# a sine at 100 Hz
t = np.arange(int(T * fs)) / fs
x = np.sin(2 * np.pi * 100 * t)
# Do chain of processing
r = (
    Response.from_time(fs, x)
    # time window at the end and beginning
    .time_window((0, 0.1), (-0.1, None), window="hann")  # equivalent to Tukey window
    # zeropad to one second length
    .zeropad_to_length(fs * 1)
    # circular shift to center
    .circdelay(T / 2)
    # resample with polyphase filter, keep gain of filter
    .resample_poly(500, window=("kaiser", 0.5), normalize="same_amplitude")
    # cut 0.2s at beginning and end
    .timecrop(0.2, -0.2)
    # apply frequency domain window
    .freq_window((0, 90), (110, 500))
)
# plot magnitude, phase and time response
r.plot(show=True)
# real impulse response
r.in_time
# complex frequency response
r.in_freq
# and much more ...

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