National Instruments 320571-01 用户手册

Generates a set of linear-phase finite impulse
response multiband digital filter coefficients
using the number of taps, sampling
frequency, filter type, and Band Parameters.

# of taps is the total number of coefficients in H.  A tap corresponds to a multiplication and an addition.
If there are n taps, every filtered sample requires n multiplications and n additions.  # of taps must be
greater than 0.  If # of taps is less than or equal to zero, the VI returns an error.  # of taps defaults to 32.

sampling freq : fs defaults to 1.0.

Band Parameters is a cluster.  Each cluster element contains the necessary information associated with
each band for the FIR design.  Each cluster contains four elements, as shown in the following figure:

The Band Parameters cluster must contain at least one element, that is, one band.

amplitude is a DSP Handle Cluster that indicates the memory buffer on the DSP board that
contains the desired amplitude for each band.

lower freq is a DSP Handle Cluster that indicates the memory buffer on the DSP board that
contains the lower frequency bands.

higher freq is a DSP Handle Cluster that indicates the memory buffer on the DSP board
that contains the upper frequency bands.