matplotlib-users

[Matplotlib-users] specgram of EEG data

[Tim L. <ti...@cs...>]

Hi John (and others),

I'm working with EEG data and want to use a specgram similar to what you
have in the example at the bottom of 

http://matplotlib.sourceforge.net/screenshots.html

I'm working with data sampled at 500Hz but as you would know we're more
interested in the 0-50Hz range. Is the some way to get the specgram()
function to only show up a particular frequency range rather than
downsampling the data to a lower sampling rate? I'm currently plotting
with 

    specgram(data, Fs=500)
    colorbar()
    show()

but I'm not too sure where to go from here to achieve my aims.

Thanks in advance and for putting together an amazingly useful package.

Tim Leslie

Re: [Matplotlib-users] specgram of EEG data

[John H. <jdh...@ac...>]

>>>>> "Tim" == Tim Leslie <ti...@cs...> writes:

    Tim> I'm working with data sampled at 500Hz but as you would know
    Tim> we're more interested in the 0-50Hz range. Is the some way to
    Tim> get the specgram() function to only show up a particular
    Tim> frequency range rather than downsampling the data to a lower
    Tim> sampling rate? I'm currently plotting with

    Tim>     specgram(data, Fs=500) colorbar() show()

Set the ylimits of the specgram axes to show only the frequency bad of
interest

  specgram(data, Fs=500)
  ylim(0, 40)
  colorbar()


    Tim> but I'm not too sure where to go from here to achieve my
    Tim> aims.

    Tim> Thanks in advance and for putting together an amazingly
    Tim> useful package.

Your welcome!  You may want to check out my eegview package at
http://pbrain.sf.net.  It's poorly documented and I don't have a lot
of time to support it currently, but there is already a lot there and
if you wanted to contribute some effort to that rather than starting
over, that would be great.  We are in the process of trying to hire
someone to help with the development, maintenance and documentation of
that package, so I suspect it will see some activity in the not too
distant future.

JDH