#!/usr/bin/env python3
# -*- coding: utf-8 -*-
"""angle_spectrum: phase angle spectrum demo."""
import numpy as np
[docs]
def plot_angle_spectrum(plt, rng, ax=None):
"""Phase angle spectrum demo.
Demonstrates: ax.angle_spectrum()
"""
if ax is None:
fig, ax = plt.subplots()
else:
fig = ax.get_figure() if hasattr(ax, "get_figure") else ax.fig
fs = 1000
t = np.linspace(0, 1, fs)
signal = np.sin(2 * np.pi * 50 * t) + 0.5 * np.sin(2 * np.pi * 120 * t + np.pi / 3)
ax.angle_spectrum(signal, Fs=fs, id="angle_spectrum")
ax.margins(x=0.02) # Add padding to prevent edge clipping
ax.set_xlabel("Frequency")
ax.set_ylabel("Phase (radians)")
ax.set_title("angle_spectrum")
return fig, ax
# EOF