.. DO NOT EDIT.
.. THIS FILE WAS AUTOMATICALLY GENERATED BY SPHINX-GALLERY.
.. TO MAKE CHANGES, EDIT THE SOURCE PYTHON FILE:
.. "auto_examples/plot_3_1_2_stft.py"
.. LINE NUMBERS ARE GIVEN BELOW.

.. only:: html

    .. note::
        :class: sphx-glr-download-link-note

        Click :ref:`here <sphx_glr_download_auto_examples_plot_3_1_2_stft.py>`
        to download the full example code

.. rst-class:: sphx-glr-example-title

.. _sphx_glr_auto_examples_plot_3_1_2_stft.py:


=======================
STFT of an Audio Signal
=======================

Figure 3.4 from the tutorial.

.. GENERATED FROM PYTHON SOURCE LINES 16-34



.. image-sg:: /auto_examples/images/sphx_glr_plot_3_1_2_stft_001.png
   :alt: Squared modulus of the STFT of the word GABOR
   :srcset: /auto_examples/images/sphx_glr_plot_3_1_2_stft_001.png
   :class: sphx-glr-single-img





.. code-block:: default


    from os.path import dirname, abspath, join
    from scipy.io import loadmat
    import numpy as np
    import matplotlib.pyplot as plt

    DATA_PATH = join(abspath(dirname("__file__")), "data", "gabor.mat")
    signal = loadmat(DATA_PATH)['gabor'].ravel()
    tfr = loadmat(DATA_PATH)['tfr']
    time = np.arange(338)
    freq = np.arange(128, dtype=float) / 256.0 * 1000

    plt.contour(time, freq, tfr)
    plt.grid(True)
    plt.xlabel('Time  [ms]')
    plt.ylabel('Frequency  [Hz]')
    plt.title('Squared modulus of the STFT of the word GABOR')
    plt.show()


.. rst-class:: sphx-glr-timing

   **Total running time of the script:** ( 0 minutes  0.146 seconds)


.. _sphx_glr_download_auto_examples_plot_3_1_2_stft.py:

.. only:: html

  .. container:: sphx-glr-footer sphx-glr-footer-example


    .. container:: sphx-glr-download sphx-glr-download-python

      :download:`Download Python source code: plot_3_1_2_stft.py <plot_3_1_2_stft.py>`

    .. container:: sphx-glr-download sphx-glr-download-jupyter

      :download:`Download Jupyter notebook: plot_3_1_2_stft.ipynb <plot_3_1_2_stft.ipynb>`


.. only:: html

 .. rst-class:: sphx-glr-signature

    `Gallery generated by Sphinx-Gallery <https://sphinx-gallery.github.io>`_