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 at the Pennsylvania State University by 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
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:
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.
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.
oldMessageStream = $Messages; $Messages = Identity; Needs[ "SignalProcessing`Master`" ]; $Messages = oldMessageStream;
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
TruncCon.m that will truncate all
signal processing contexts to an MS-DOS filename format, but it
can also be used to truncate context names of other packages.
You must load in the TruncCon.m
package before evaluating
Needs[ "SignalProcessing`Master`" ]