User guide

Charnwood Dynamics Ltd. Coda cx1 User Guide – Reference IV-5
CX1 USER GUIDE - COMPLETE.doc 26/04/04 154/162
Data Types
Epoch Data
Epoch data is data which is acquired or calculated for all epochs of the measurement period.
The number of epochs depends on the original sampling rate of the acquired data types.
The types of epoch data which are available for plotting are described below.
These data types correspond to the list displayed in the Ordinate Axis variables list of the
Graph Add Plot dialogue (Views: New Graph View... Add Plot... or Views: Edit Graph
Plots... Edit Plot...)
All these data types can be plotted on Graphs, and can be copied to other Windows
applications using Edit: Copy as text... from Graphs, or by using Windows DDE.
Acquired data (data saved in MDF files):
Marker Position The (x,y,z) coordinates of acquired markers.
[X,Y,Z] (mm) If Filtering and/or Interpolation is on (Setup: Data Filers...), then these
coordinate values are the filtered and/or interpolated values; otherwise the
values are as measured by Coda.
(Coordinates saved to an MDF file are always the un-filtered values.)
The marker position data includes in-view flags which record whether a
marker was in view of the Coda measurement unit for each epoch. When a
marker is out of view, its position is interpolated between the last and next
in-view positions.
The names and plot-colours associated with Marker Position data is
defined in the Setup: Markers... dialogue. Interpolated data is plotted in
grey.
Marker position data is used to draw the Stick-figure View, as defined in the
Stick-figure Joining Diagram.
Force Floor reaction force vector data (Fx, Fy, Fz) calculated from the data
acquired
[X,Y,Z] (N) from a force plate.
The names and plot-colours associated with Force data are defined in the
Setup: Force channels... dialogue.
(The MDF data file stores the original channel data for each force plate (8
channels each).)
EMG/ADC EMG or Analogue ADC data (8 / 64 channels per EMG / ADC system).
(µV / mV) The names and plot-colours associated with EMG/ADC data is defined in
the Setup: EMG/ADC channels... dialogue.
Analogue Force interface data (6 / 8 channels per force plate). These are the
individual
Channel analogue signal values, offset and scaled by the values in FP1.cal, and
converted to internal units.
Digital Digital I/O interface data (8 channels per digital interface – 15 channels
Channel if an ADC-64 acquisition unit is configured).
The value of a digital channel is 0 for Low and 1 for High.
The digital channels are active-low, so On = 0, Off = 1.