User`s manual

Cerebus® User’s Manual
Revision 13.00 / LB-0028 Page 22
Digital Filters
The sampled signals are analog filtered by the Amplifier at cut-off frequencies of 0.3 Hz and 7.5 kHz. Additionally,
the NSP has standard digital filters that can be applied to signals from the Amplifier and the auxiliary analog inputs.
These filters are described below:
o None: No digital filter is applied.
o HP 750Hz (Spike Narrow): High-pass filter at 750 Hz.
o HP 250Hz (Spike Medium): High-pass filter at 250 Hz.
o HP 100Hz (Spike Wide): High-pass filter at 100 Hz.
o LP 50Hz (LFP Narrow): Low-pass filter at 50 Hz.
o LP 125Hz (LFP Medium): Low-pass filter at 125 Hz.
o LP 250Hz (LFP Wide): Low-pass filter at 250 Hz.
o LP 500Hz (LFP X-Wide): Low-pass filter at 500 Hz.
o LP 150Hz (EEG/ECG/EOG/ERG): Low-pass filter at 150 Hz.
o BP 10Hz-250Hz (EMG/Motor Unit): Band-pass filter at 10 Hz and 250 Hz.
o LP 2.5kHz (Activity): Low-pass filter at 2.5 kHz.
o LP 2kHz (2kHz Low Pass): Low-pass filter at 2 kHz.
o BP 250Hz-5kHz (Spike Contents): Band-pass filter at 250 Hz and 5 kHz.
File Specification
File specifications define what is saved in the data files (NEV and NSx). Newer file specifications contain more
information than older file specifications. For example, file specification version 2.3 is capable of storing comments
in the data file whereas file specification version 2.1 is not. Also, file specification version 2.1 does not save channel
information, such as filters used, in the NSx file. We always recommend using the latest file specification version to
record your file. Note that this selection is only available when using 2.x File App interface (Page File Storage 45).
o File Specification 2.1: Both NEV and NSx files are saved using their respective file format versions 2.1.
o File Specification 2.2: Both NEV and NSx files are saved using their respective file format versions 2.2.
o File Specification 2.3: NEV file is saved using file format version 2.3; NSx is saved using file format version 2.3.
o TOC File App: TOC file app automatically uses NEV 2.3 and NSx 2.3 This combination cannot be changed.