User guide

Charnwood Dynamics Ltd. Coda cx1 User Guide – Reference IV-2
CX1 USER GUIDE - COMPLETE.doc 26/04/04 142/162
The marker position data must be multiplied by this resolution to get values in µm.
Currently the same value for all markers: 100µm for CODA mpx-30 data; 200µm for CODA-3 data.
The Coda cx1 marker resolution value is set to 1 and the position data is stored in mm (floating point).
14 Hardware markers acquired:
This lists the markers for which data was acquired, in the same order as the data arrays.
The values are (Marker ID - 1) - i.e. 0...11 for markers 1...12.
For CODA-3 data, all 12 markers will be listed, even if they were not used (the corresponding data arrays
will be present but invalid; the marker-in-view flags will be set to 0)
15 Data display zoom positions:
Present only if the graphs in Motion Analysis were zoomed in before saving the data. The two values are the
scaled minimum and maximum time values for the range of data displayed on the graphs.
The data must be divided by the value in DataType[16] to get values in seconds.
16 Time scale for zoom positions:
This will be the same as the Cursor & Bar time scale, which is the marker sampling rate.
17 Primary Gait-cycle positions:
If present, these are time-axis positions defining Left & Right Gait cycles in a clinical gait analysis data file.
Each cycle has three values defining heel-down, toe-off, heel-down. The first cycle is Left, and the second is
Right. If one of the cycles is not defined (unilateral data), the three values for that cycle are zero.
The data must be divided by the value in DataType[11] to get time coordinates in seconds.
18 Analogue Force resolution (f.resolution):
If present, these are the resolutions of the force data channels (one value for each channel).
The force data must be multiplied by this resolution to get values in Newtons.
If not present (Version 1 data files), the resolution is assumed to be 0.05N.
19 Analogue EMG resolution (e.resolution):
If present, these are the resolutions of the EMG data channels (one value for each channel).
The EMG data must be multiplied by this resolution to get values in µV.
If not present (Version 1 data files), the resolution is assumed to be 1.842µV.
20 Force plate constants:
If present, these are the x,y,z offset constants of the force plate (200, 120, 54mm for a Kistler force plate).
The values are stored at the same resolution as marker position data, so must be multiplied by the (first)
resolution value stored in Data type 13 to get coordinate values in µm.
21 Force plate position:
If present, these are the coordinates of the four corners of each force plate. There is one force plate for
each group of 8 force channels. The coordinates are stored at the same resolution as marker position data,
so must be multiplied by the (first) resolution value stored in Data type 13 to get coordinate values in µm.
22 Marker names:
If present, these are copies of the Markers names in the Setup as it was at the time the data file was saved.
(Setup: Markers...)
Each name may be different length; the strings are null-terminated.
23 Analogue Force channel names:
Not yet implemented. These will be copies of the names in the Setup for raw analogue force channels
(which are not currently accessible). (Not the Setup: Force channels... names.)
24 Analogue EMG channel names:
If present, these are copies of the names of EMG channels in the Setup as it was at the time the data file
was saved (Setup: EMG channels...). Each name may be different length; the strings are null-terminated.
25 Patient ID:
26 Patient Classification:
As entered in the Subject/Patient Identification dialogue box (File: Subject/Patient Data...)
27 Patient data:
Patient Sex, Date of birth, Age, Weight & Height. Integer values: Sex: 0 = male, 1 = female; Date of birth:
mmyy; Age in years; Weight in kg; Height in mm.