User`s manual

Cerebus® User’s Manual
Revision 13.00 / LB-0028 Page 58
How To?
Create a Digital Filter
Custom digital filters can be defined and used. To create a digital filter do the following:
1) Open Central.
2) Click on Digital Filter Editor. Allow for the Digital Filter Editor to open. This tool requires MATLAB Core Run-time
which is available on the Cerebus® Installation CD or can be downloaded from our website.
3) Choose a filter type and the corner frequencies desired. If the filter is unstable the filter design tool will warn you and
suggest ways to make the filter more stable.
4) Save the filter in a known location and close the program.
5) On Central click on file and then Load Digital Filters.
6) Locate the previously saved digital filter.
7) At this point this newly added filter will be available in the drop down menu under Hardware Configuration for all
analog inputs.
Setup Channels for Data Acquisition
The software will allow you to record three streams of data concurrently. The streams are wideband data sampled at
30 kHz, continuous data with custom digital filters, and threshold crossed spike waveforms and their associated
timestamps along with other custom neural events, such as the digital and serial inputs. To setup the channels for
data acquisition do the following:
1) Open Central.
2) Click on Hardware Configuration.
3) Select a channel to configure. You can also select a few channels by holding down CTRL or select a range of channels
by holding down the SHIFT key while making the selection.
4) Right click and choose Properties. Alternatively, you can click on the properties icon on the toolbar.
5) To enable the raw stream (wideband data sampled at 30 kHz) enable raw sampling by checking the Enable box. This
data will be saved in a file with NS6 file extension.
6) To enable continuous data suitable for LFP or wideband acquisition, select a sampling rate from the pull down menu.
Depending on the sampling rate, this stream will be saved in a file with NS1 (500 Hz), NS2 (1 kHz), NS3 (2 kHz), NS4
(10 NS4), or NS5 (30 kHz) file extensions.
7) (Optional) Choose a filter for the continuous streams. To record LFP signals, choose a low-pass filter, such as LP 150.
To record the continuous spike stream, choose a high-pass filter such as HP 250.
8) To enable spike extraction, select Enable Spike Processing box.
9) Choose a filter for the spike stream. To properly extract spikes, a high pass filter needs to be applied to this stream. If
you are not sure which filter to choose we recommend using HP 250.
10) A proper threshold needs to be set otherwise spikes may not be extracted. See “Set Spike Extraction Threshold” section
below to learn how to setup threshold values.