VTI Instruments EX1629 - Page 262

VTI Instruments Corp.
262 EX1629 Command Set
NOTE When setting channel filters on the EX1629, it is highly recommended that the same filter setting
be used for each group of sixteen channels (0 through 15, 16 through 31, and 32 through 47) as
this ensures the tightest relative timing between channels. For more information on IIR filtering
delays, please see the Group Delay discussion in Appendix B.
EXAMPLE
ViSession instrumentHandle;
ViStatus status;
ViInt32 channels[] = {0};
ViInt32 numberOfChannels = 1;
…
/*
configure IIR filtering on channel 0, with a 5
th
order Bessel filter with a cutoff
frequency of 50Hz, using the bilinear transform
*/
status = vtex1629_set_IIR_filter_configuration (instrumentHandle,
channels,
numberOfChannels,
VTEX1629_IIR_FILT_BESSEL,
50.0,
VTEX1629_TRANSFORM_BILINEAR,
5);
…
// disable IIR filtering on channel 0
status = vtex1629_set_IIR_filter_configuration (instrumentHandle,
channels,
numberOfChannels,
VTEX1629_IIR_FILT_NONE,
0.0,
VTEX1629_TRANSFORM_BILINEAR,
0);