DADiSP / Filters 6.7
Digital Filter Design Module
DADiSP/Filters is a menu-driven, digital filtering module that
adds complete FIR and IIR filtering capabilities to DADiSP.
DADiSP/Filters allows you to quickly design, analyze and process
both FIR (Finite Impulse Response) and IIR (Infinite Impulse
Response) digital filters from easy-to-use dialog boxes or simple
one line functions. On-line help and examples are also
Design, Analyze and Apply
DADiSP/Filters gives you the power to easily build
digital filters that emulate hardware based designs for testing and
verification or perform
filtering operations not possible with traditional analog methods.
DADiSP/Filters allows you to remove noise generated during the data
DADiSP/Filters is the perfect complement to GPIBLab
, DADiSP's acquisition module for
collecting data from IEEE-488 based instruments and DADiSP/AdvDSP
, a sophisticated module for
advanced signal processing techniques. In addition, the
increases the speed of many DADiSP/Filters functions by
significantly accelerating the computation of the core FFT and convolution functions.
The FIR module creates linear phase lowpass, highpass, bandpass, bandstop,
multiband, Hilbert transformers and differentiators using the
Parks-McClellan/Remez Exchange optimal design algorithm. The
filter order can be specified or automatically estimated from the
particular filter specifications. The Kaiser Window method is also
provided, capable of creating both very high order FIR filters and
extremely tight, narrowband filters.
The IIR module supports
Bessel, Butterworth, Chebychev I, Chebychev
II and Elliptic designs for lowpass, highpass, bandpass and
bandstop recursive filters. The Bilinear transform method is
employed and the resulting IIR coefficients can be determined in
optimal multistage cascade format or traditional Direct form. Coefficients for analog designs
can be computed. The
module also supports the Matched-Z transform method to approximate
linear phase characteristics for IIR Bessel filters.
Filter coefficients can be converted to and from Cascade, Direct and FIR
form and the coefficients can be quantized to emulate
The impulse, magnitude, phase and group delay characteristics can be
calculated for any filter. Bode and Pole-Zero plots are also supported. Efficent
time and frequency domain filtering algorithms are provided to apply the
filter to any series.
The filters module is fully integrated with DADiSP
to provide a complete digital filter design, analysis, display and
processing environment. The DADiSP/Filters user interface
is dialog based, eliminating the need to memorize argument lists or formulas and
allows quick recall of previous filter designs. The filter
coefficients are automatically displayed in a DADiSP window and can
be saved for further use by DADiSP or other programs.
DADiSP/Filters requires DADiSP 6.7 B01
for information about updating your current
version of DADiSP.