.. currentmodule:: brian

.. index::
   pair: example usage; whitenoise
   pair: example usage; IRCAM_LISTEN

.. _example-hears_ircam_hrtf:

Example: ircam_hrtf (hears)
===========================

Example showing the use of HRTFs in Brian hears. Note that you will need to
download the :class:`IRCAM_LISTEN` database.

::

    from brian import *
    from brian.hears import *
    # Load database
    hrtfdb = IRCAM_LISTEN(r'F:\HRTF\IRCAM')
    hrtfset = hrtfdb.load_subject(1002)
    # Select only the horizontal plane
    hrtfset = hrtfset.subset(lambda elev: elev==0)
    # Set up a filterbank
    sound = whitenoise(10*ms)
    fb = hrtfset.filterbank(sound)
    # Extract the filtered response and plot
    img = fb.process().T
    img_left = img[:img.shape[0]/2, :]
    img_right = img[img.shape[0]/2:, :]
    subplot(121)
    imshow(img_left, origin='lower left', aspect='auto',
           extent=(0, sound.duration/ms, 0, 360))
    xlabel('Time (ms)')
    ylabel('Azimuth')
    title('Left ear')
    subplot(122)
    imshow(img_right, origin='lower left', aspect='auto',
           extent=(0, sound.duration/ms, 0, 360))
    xlabel('Time (ms)')
    ylabel('Azimuth')
    title('Right ear')
    show()