Downloading SPDemo 4.47.4 from the developer's website was possible when we last checked. We cannot confirm if there is a free download of this software available. The software lies within Education Tools, more precisely Teaching Tools.
The most popular versions among the program users are 4.4 and 3.0. The program's installer file is commonly found as SPDemo.exe. According to the results of the Google Safe Browsing check, the developer's site is safe. Despite this, we recommend checking the downloaded files with any free antivirus software. The actual developer of the free program is SIPL.
From the developer:
SPDemo is an assisting tool for teaching speech & audio processing techniques developed in SIPL .
Using SPDemo one can select from a variety of speech & audio processing techniques and parameters in a straightforward and simple way. The results of this processing are shown both numerically and graphically, in order to ease the analysis of data.
You may want to check out more software, such as F.E.A.R. 2 SP Demo, which might be related to SPDemo.