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Signal Processing Packages for Mathematica
Signal Processing Packages for Mathematica
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Brian Evans is the author of the signal processing packages
and notebooks for Mathematica, and an
on-line
demonstration of version 2.9.5 of these packages
by Robert Bamberger
at Washington State University is available.
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Brian Evans is the
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Brian Evans is the
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author of the Signal Processing Packages and Notebooks for
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Mathematica.
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Mathematica.
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The packages support both analog and digital signal processing theory
and visualization in multiple dimensions.
The packages implement common signals and systems,
the Laplace, Fourier, z, DTFT, and DFT transforms,
symbolic discrete and continuous convolution,
and digital and analog IIR filter design.
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The Signal Processing Packages can also convert algebraic descriptions
of algorithms to textual representations for the
Ptolemy interpreter.
The notebooks accompanying the packages include tutorials on analog
filter design, convolution, and the z-transform.
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A freely distributable version of the packages and notebooks is
available by anonymous FTP to
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Version 2.9.5 of the Signal Processing Packages was released
in the Fall of 1993.
An
on-line
demonstration of this version of the packages
by Roberto Bamberger at
Washington State University is available.
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The Signal Processing Packages have been under development since
February of 1989, and Version 2.9.5 was released in the Fall of 1993.
The Signal Processing Packages have been used in the teaching of
signals and systems at different levels in the undergraduate engineering
programs at the
Georgia Institute of Technology,
the Rose-Hulman Institute of
Technology, and
Washington State University.
It has been used to teach convolution in civil engineering classes
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at the Pennsylvannia State University by
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at the Pennsylvania State University by
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Prof. Christopher J. Duffy.
Prof. Roberto Bamberger at
Washington State University has been
using the packages extensively in various signal processing courses.
Based on version 2.9.5 of the signal processing packages, he has developed
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Since the Fall of 1993, I have overhauled the interface to the packages
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to conform with the rest of Mathematica and add much new functionality.
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to conform with the rest of Mathematica, added many new functions (e.g.
filter design), and fixed many bugs.
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The newest version, 3.0, is currently available in two commerical products:
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The newest version, 3.0, is currently available in two commercial products:
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Since the Fall of 1993, I have overhauled the packages to create version 3.0.
Version 3.0 was released April 28, 1995, and Version 3.0.1 was released
October 2, 1995, respectively, in the following commercial products:
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In version 3.0, I have changed the syntax to conform with the rest of
Mathematica, added many new functions, and fixed many bugs.
Some of the new functionality includes more IIR digital filter design
routines, symbolic filter design, multidimensional windows,
a sampled data type for numerical signals, and separate convolution
animation routines.
Some the enhanced functionality includes improvements in the
convolution routines to handle intervals with symbolic end points,
graphical design of two-dimensional decimators, signal plotting,
and the high-level digital and analog analysis/reporting functions.
Version 3.0 comes with a compatibility file that implements obsolete
functions and reports obsolete uses of syntax in files (e.g., in packages
and notebooks).
Many bugs, and inconsistencies in option handling, have been removed,
especially in the transforms.
Special thanks to John Novak at Wolfram Research Inc. for working
with me on this upgrade.
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Downloading by FTP
Version 2.9.5 is the most recent one available by FTP:
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Compatibility with Mathematica
Version 2.9.5 of the Signal Processing Packages will work with
Mathematica 2.0, 2.1, and 2.2.
The Notebooks were written using Mathematica 2.1, and some
irregularities will occur when they are opened under Mathematica 2.2.
When Mathematica 2.2 evaluates the command
Needs[ "SignalProcessing`Master`" ]
Mathematica will print out the warning message
Needs::nocont: Warning:Context SignalProcessing`Master`
was not created when Needs was evaluated.
You can ignore this message.
Caveats
Some users dislike seeing the messages that are displayed when
the above Needs command is evaluated. You can suppress the messages
by using the following code to initialize the signal processing packages:
oldMessageStream = $Messages;
$Messages = Identity;
Needs[ "SignalProcessing`Master`" ];
$Messages = oldMessageStream;
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The PC release of Version 2.9.5 will not work properly under
Windows '95 because the PC release is in MS-DOS format with all
of the filenames truncated to eight- character names plus
three-character extensions.
When Mathematica initializes the signal processing packages,
it will look for the context "SignalProcessing`Support`" which
Mathematica interprets as the file "SignalProcessing\Support.m".
However, the directory "SignalProcessing" does not have an entry (mapping)
under Windows '95 to an eight-character filename.
The names of 25 of the packages and one directory have been truncated.
There are three possible solutions:
- expand the names of the 26 truncated filenames/directories
under Windows '95,
- edit all of the packages and truncate the package names
to eight characters in length, or
- overload the ContextToFilename routine to generate
eight-character filenames.
The cleanest solution is the last one, and I have rewritten a
package called TruncCon.m
to truncate the filenames corresponding to long context names.
Currently, the package only truncates signal processing contexts,
but code exists in the package to truncate all contexts.
You must load in the "TruncCon.m" package before evaluating
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The PC release of Version 2.9.5 will not work properly under Windows
95 because the PC release is in MS-DOS format with all of the filenames
truncated to eight characters, but the contexts in signal processing
packages are not truncated to eight characters.
So, when Mathematica looks for the context
SignalProcessing`Support`, Mathematica interprets
it as "SignalProcessing\Support.m", but the directory
SignalProcessing does not have an entry (mapping) under
Windows 95 to an eight-character directory name, and Mathematica will
report that it cannot find it.
I have written a package called
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TruncCon.m that will truncate all
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TruncCon.m that will truncate all
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signal processing contexts to an MS-DOS filename format, but it
can also be used to truncate context names of other packages.
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You must load in the TruncCon.m
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You must load in the TruncCon.m
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package before evaluating
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Needs[ "SignalProcessing`Master`" ]
Copyright
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The Signal Processing Packages and Notebooks are copyright ©
1989-1995 Georgia Tech Research Corporation.
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All Rights Reserved.
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Ptolemy Project
Send comments to Brian Evans at
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ble@eecs.berkeley.edu
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bevans@ece.utexas.edu
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