#! /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
====================================

This example shows the wireframe plot of the Wigner-Ville distribution of a
chirp. The WV distribution can take negative values, and has almost perfect
localization in the time-frequency plane.

Figure 4.1 from the tutorial.
"""

from tftb.generators import fmlin
from tftb.processing import WignerVilleDistribution

sig = fmlin(256)[0]
tfr = WignerVilleDistribution(sig)
tfr.run()
tfr.plot(threshold=0.0, kind='wireframe')