An illustrated essay with free software to download
Last updated December 7, 2013
Department of Chemistry and Biochemistry
University of Maryland at College Park
This essay is also available as a single 121-page
printable document written in OpenOffice and
saved in Open Document**, Word, and
PDF formats.December 7,
2013 version. Readability index
This web site can be downloaded in archived HTML format complete with
all linked software (35 MBytes).
* Pragmatic: Relating to matters of fact or practical affairs,
often to the exclusion of intellectual or artistic matters;
practical as opposed to idealistic.
** What is Open Document format? See http://www.coolutils.com/Formats/ODT
Octave, a free
alternative to Matlab, mostly compatible.
SPECTRUM, simple freeware signal processing program for
Macintosh OS 8
Unsolicited Comments from Users:
"Thank you so much for this wonderful teaching tool!
"Your lessons on signal
processing are really useful and intriguing...."
"I have no words to describe how
excited I am and how thankful I am about your work. This
is...a teaching paradise...really
"Thanks for your amazing
"Thank you for sharing your
"I found your signal processing
pages ... very helpful!"
"Thank you for your time and the
wonderful material (software and text) you have put up on your
"I have been reviewing your webpage on signal
processing and am very impressed with the clarity of the
"I loved your article on
"...the tutorials on your website
have been of tremendous help to me."
"I find your Introduction an excellent starting
"...really clear and concise."
" ... very useful for teaching in an Instrumentation
course for M.Sc postgraduates in analytical chemistry. The
sequence of the topics and the explanations are very clear."
"[Y]our web site has such excellent content...."
"I tried the demo version of SPECTRUM and I think is a
very useful tool for the introduction of signal processing to
analytical chemistry students."
" ... a splendid program."
"Thanks...for your excellent code."
"...thank you for taking the time to create these
"Congratulations on a very useful and rather easy tool."
"Thank you for developing such a nice tool."
"Your Interactive Peak Fitter ... is very helpful."
"I found your Peak Fitter program to be incredibly useful for
some work I am doing...."
"Your peak finding and fitting scripts ... turned out
handy in analyzing my research data."
"I appreciate all the work that must have gone into the
PeakFit matlab coding. I've been using it for a couple of
weeks, now, and it is becoming extremely useful."
"Thank you for your Matlab function findpeaks(). It is
quite literally EXACTLY what I was looking for and far better
than I could have hoped."
"Thank you so much for designing and creating MATLAB code
for scientists! It's such a great resource to have code on
MATLAB Central. I really appreciate your efforts."
"Thank you for making available your absolutely superb
Peakfinder software. It is a snap to use...."
program is fantastic."
"... thanks for all the spectroscopy MatLab scripts that you
have written and meticulously documented. Finding them has
saved me more than a few hours."
"...excellent piece of software...really useful and
"...I would like to express my thanks for making such a
wonderful tool for derivative spectroscopy, it has been much
help for me!
"...Interactive Fourier Filter is a great tool to help with
low-, high-, band-pass-, and band-stop filtering, and best of
all, you can view the effect of filtering parameters on your
time-series as you change them! "
" I have been using iSignal for the past day to analyze my data,
and it works GREAT!.... I am able to extract lots of information
from my spectra now."
"...thanks for the great tool! Saved me a lot of work."
"...iPeak ... is very useful."
"I am using your peakfitter in Matlab and love it....worked like
"Great code....Wonderfully documented!"
what I needed....The
result looks really great!"
(c) 2013, Thomas C. O'Haver (email@example.com)
Permission is hereby granted, free of charge, to any person
obtaining a copy of this software and associated documentation
files (the "Software"), to deal in the Software without
restriction, including without limitation the rights to use, copy,
modify, merge, publish, distribute, sublicense, and/or sell copies
of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be
included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
First edition created in 1995. Last updated
November, 2013. This website was created with SeaMonkey.
This site is a retirement project maintained by Prof. Tom O'Haver,
Professor Emeritus, Department of Chemistry and Biochemistry, The
University of Maryland at College Park. Comments, suggestions and
questions should be directed to Prof. O'Haver at firstname.lastname@example.org.
Number of unique visits to this site since May 17, 2008: