pyqtspecgram 0.1.0

Python spectogram plotted using pyqtgraph.

pyqtspecgram

Python spectogram plotted using pyqtgraph

Pyqtplot allows significantly faster navigation and zooming for larger scale waterfalls compared to pyplots specgram method.

See more on https://github.com/epeters13/pyqtspecgram

Author: Edwin G.W. Peters

Requirements

• scipy
• pyqtgraph

Installation

pip install pyqtspecgram

or

python setup.py install

Usage

Check "test_pyqtspecgram" for an example

Plot a waterfall

from pyqtspecgram import pyqtspecgram
import numpy as np

Fs = 1e6
t = 5  # sec
N = int(t * Fs)
sigma_noise_2 = 0.1
NFFT = 4096

a = np.exp(1j * 2 * np.pi * 150e3 / Fs * np.arange(N))
a += np.exp(-1j * 2 * np.pi * 298e3 / Fs * np.arange(N))
a += np.sqrt(sigma_noise_2) / 2 * (np.random.randn(N) + 1j * np.random.randn(N))

Sxx, f_a, t_a, fig = pyqtspecgram(a, NFFT, Fs, Fc=0)

Todo

• Prevent garbage collection when returning from main thread to allow figure to remain open in the background in an interactive ipython console
• Export coordinates in graph to console with double or right click
• Allow dynamic time-averaged spectrogramming for very large data sets