.. include:: ../links.inc

Optimic
=======

The `Optimic MEG microphone`_ is a passive fiber optic microphone from the company
`Opto acoustics`_.

.. image:: ../_static/devices/optimic.png
    :align: center
    :class: img-with-border
    :width: 600

The microphone is connected to the Electro-Optic Unit (EOU 200, single channel) on the
desktop which converts the optical signal to an electrical signal. The EOU unit is
connected to the audio input channel of the
:ref:`stimulation PC <stim-pc:Stimulation PC>`, to a ``misc`` channel of the MEG and to
speakers for feedback.

.. note::

    Due to the 'low' :ref:`sampling rate <meg-settings:Sampling rate>` of the MEG, most
    auditory waveforms can not be sampled by the MEG system. However, it is usually
    possible to observe the onset of the recorded sound.