"I have been using MATLAB/SIMULINK over many years to develop programs for teaching communications and signal processing. But what DSP Creations have now done (with Slifer, Sketch-a-Filt and DSP_Speedster) is to free up my time from writing endless code – and doing it badly! In addition, I could never have hoped to develop (on my own) a package of such sophistication and breadth that I can use it effortlessly during u/g and p/g lectures to demonstrate both the fundamentals and advanced topics of signal processing and communications.

And along with the excellent twenty introductory videos this package can just be given directly to university students, who can then be told to "get on with it" – and they do! It stimulates their interest, backs up the theory from lectures and lets them experiment with 'what if ?' questions.

For example, there is really nothing on the market to compare with the sixty demos in DSP_Speedster to get students excited about signal processing and communications. And although clear and simple to implement they are also rigorous and precise in their use of theory and application. I have never seen better.

However, be warned – there is a downside for lecturing staff. The whole suite of programs is so sophisticated, easy to use and unfortunately, addictive, that you'll now be spending all that precious time you've freed up just running through the myriad of possibilities and saying: 'Wow – I didn't realize that!!"

Dr. Des McLernon
Reader in Signal Processing
School of Electronic and Electrical Engineering
The University of Leeds

"I had a really enjoyable tour through FIR filter design, analysis and especially the visualization of this process, which is extremely user-friendly.

It is really a pleasure to design a filter with Slifer and Sketch-a-Filt. The latter includes impressive graphical abilities which can be very useful in design projects, MSc modules on DSP as well as for some research problems. It was quite interesting to go through the design exercises you have provided."

Prof. Plamen Angelov
Professor of Intelligent Systems
Lancaster University

"It did not take me long after taking delivery of Sketch-a-Filt and Slifer to become familiar with these packages: a few hours only. They really are easy to use, and I can see that they will very easily adopted by students who have had only a minimal exposure to MATLAB.

Both Sketch-a-Filt and Slifer have been cleverly designed to promote filter design as a highly interactive and rapidly creative process: designers get the designs they want in satisfyingly brief design sessions.

In Sketch-a-Filt an initial filter response can be sketched by hand, then the filter designed by invoking one or several of filter design procedures, such as Frequency-Sampling, Remez, Least-Squares and others. Particularly impressive is the Brandenstein-Unbehauen design (new to me) which can be used to economise a satisfactory FIR design by substituting a nearly equivalent simpler (sometimes much simpler) IIR design.

Slifer can be used to fine-tune filters designed using Sketch-a-Filt, or directly by first defining stylised specifications. There is a vast repertoire of hand-crafting operations available to the designer: pushing and pulling coefficients in the time domain, with or without constraints on symmetry and or complexity; locking or unlocking points in the frequency domain to a uniform or nonuniform grid; pushing poles and zeros around - whilst keeping an eye on the distribution of errors in the frequency domain, and monitoring the limits of passband and stopand ripples, by viewing the very useful Quality Measure facilty.

There is everything here to allow a novice designer to become rapidly familiar with the principles of filter design, and in the hands of a more expert designer these tools will substantially reduce the amount of time spent designing filters using more pedestrian tools.

I expect to make great use of these softwares, in the classroom, the tutorial and the laboratory - for both undergraduate and postgraduate students - to present digital filter design as a hands-on learning experience. There are already a large number of useful design exercises available for familiarisation, and it is easy to develop other exercises appropriate to the level at which the subject is being taught."

Kenneth V Lever
Adjunct Professor
University of South Australia

"I needed a complex baseband equivalent design to approximate an anti-aliasing filter and was simply not able to achieve it using other software on the market, despite interacting repeatedly with a leading company's technical support personnel for almost three months. DSP Creations delivered two alternative successful designs to me in a few hours using Slifer and Sketch-a-Filt. Your software is the best available tool that I know of for design of complex baseband equivalent filters."

Dr. Phillip Feldman

"This course is an excellent introduction on the foundations and scope of optimal filtering."

Sean Anderson
U.S. Aerospace Industry Participant
"Digital Random Signal Analysis and Adaptive Filtering"

"Great class! I could not get this information anywhere else. I looked for many years. All other similar courses were inferior compared to the way this course was taught. My professors at another University would just put equations on the blackboard and read them (and proofs) because they were not experts in the required fields. In contrast, Dr. Cain presented his tutorials in a way that was enlightening and inspiring! The course is very valuable to both students and to the employer. I cannot iterate enough that the course's content will inspire, educate, and greatly enlighten any serious student."

Christopher Lusardi
U.S. Aerospace Industry Participant
"Digital Random Signal Analysis and Adaptive Filtering" and "Digital Matched Filters"