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

    Click :ref:`here <sphx_glr_download_auto_examples_plot_2_3_instantaneous_frequency.py>` to download the full example code
.. rst-class:: sphx-glr-example-title

.. _sphx_glr_auto_examples_plot_2_3_instantaneous_frequency.py:


==============================================
Estimate the Instantaneous Freuqncy of a Chirp
==============================================

Construct a chirp and estimate its `instantaneous
frequency <https://en.wikipedia.org/wiki/Instantaneous_phase#Instantaneous_frequency>`_.

Figure 2.3 from the tutorial.



.. image:: /auto_examples/images/sphx_glr_plot_2_3_instantaneous_frequency_001.png
    :class: sphx-glr-single-img





.. code-block:: default


    from tftb.generators import fmlin
    from tftb.processing import plotifl, inst_freq
    # TODO: There doesn't have to be something called `plotifl`. Put this into a
    # separate visualization module.
    import numpy as np


    signal, _ = fmlin(256)
    time_samples = np.arange(3, 257)
    ifr = inst_freq(signal)[0]
    plotifl(time_samples, ifr)


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

   **Total running time of the script:** ( 0 minutes  0.188 seconds)


.. _sphx_glr_download_auto_examples_plot_2_3_instantaneous_frequency.py:


.. only :: html

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



  .. container:: sphx-glr-download

     :download:`Download Python source code: plot_2_3_instantaneous_frequency.py <plot_2_3_instantaneous_frequency.py>`



  .. container:: sphx-glr-download

     :download:`Download Jupyter notebook: plot_2_3_instantaneous_frequency.ipynb <plot_2_3_instantaneous_frequency.ipynb>`


.. only:: html

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

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