#! /usr/bin/env python # -*- coding: utf-8 -*- # vim:fenc=utf-8 # # Copyright © 2015 jaidev <jaidev@newton> # # Distributed under terms of the MIT license. """ Wigner Ville distribution of two simultaneous chirps. """ from tftb.generators import fmlin, sigmerge from tftb.processing.cohen import WignerVilleDistribution N = 64 sig = sigmerge(fmlin(N, 0, 0.4)[0], fmlin(N, 0.3, 0.5)[0], 1) tfr = WignerVilleDistribution(sig) tfr.run() tfr.plot(kind='contour', sqmod=True, show_tf=True)
#! /usr/bin/env python # -*- coding: utf-8 -*- # vim:fenc=utf-8 # # Copyright © 2015 jaidev <jaidev@newton> # # Distributed under terms of the MIT license. """ ==================================== Wigner-Ville Distribution of a Chirp ==================================== Construct a chirp signal and visualize its `Wigner-Ville distribution <https://en.wikipedia.org/wiki/Wigner_distribution_function>`_. """ from tftb.generators import fmlin from tftb.processing.cohen import WignerVilleDistribution n_points = 128 fmin, fmax = 0.0, 0.5 signal, _ = fmlin(n_points, fmin, fmax) # Wigner-Ville distribution of the chirp. wvd = WignerVilleDistribution(signal) wvd.run() wvd.plot(kind='contour', extent=[0, n_points, fmin, fmax])
# Distributed under terms of the MIT license. """ ========================================== Wigner-Ville Distribution of a Noisy Chirp ========================================== Generate a noisy chirp and visualize its Wigner-Ville spectrum. Figure 1.6 from the tutorial. """ from tftb.generators import fmlin, sigmerge, noisecg from tftb.processing.cohen import WignerVilleDistribution # Generate a chirp signal n_points = 128 fmin, fmax = 0.0, 0.5 signal, _ = fmlin(n_points, fmin, fmax) # Noisy chirp noisy_signal = sigmerge(signal, noisecg(128), 0) # Wigner-Ville spectrum of noisy chirp. wvd = WignerVilleDistribution(noisy_signal) wvd.run() wvd.plot(kind='contour')
def plot_wvd(signal):
wvd = WignerVilleDistribution(signal)
wvd.run()
wvd.plot(kind='contour')
