National Instruments Car Stereo System 320571-01 Manual De Usuario
NI-DSP Analysis VI Reference
Chapter 2
Part 3: NI-DSP Function Reference
2-56
NI-DSP SRM for LabVIEW for Windows
DSP Parks-McClellan
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.
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.
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:
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.
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.
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.
that contains the upper frequency bands.