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Access Information


SFS is only available by anonymous FTP from:

Download the latest Windows version (~16Mb).

Mailing List

If you download SFS, please consider joining the speech-tools mailing list at speech-tools@ucl.ac.uk. This list will be used for bug reports and news of updates. The only available support for SFS is through this list.

Sign up now at the Speech-tools list homepage.

On-line Documentation

All SFS manuals, tutorials and software manual pages are now accessible on-line at:

Copyright & Warranty

SFS is not public domain software, its intellectual property is owned by Mark Huckvale, University College London. However SFS may be used and copied without charge as long as the program remains unmodified and continues to carry this copyright notice. Please contact the author for other licensing arrangements. SFS carries no warranty of any kind, you use it at your own risk.


Please send suggestions for improvements and reports of program faults to sfs@pals.ucl.ac.uk.

Please note that we are unable to provide help with the use of this software.

Some other pages on our site you may enjoy:

KLAIR - a virtual infant for speech acquisition research

The KLAIR project aims to build and develop a computational platform to assist research into the acquisition of spoken language. KLAIR is a sensori-motor server that displays a virtual infant on screen that can see, hear and speak. More information.

ESYNTH - Harmonic analysis/synthesis teaching tool

ESynth is a free program designed to explain the harmonic analysis and synthesis of signals. With ESynth you can create signals by adding together individual sinusoidal waveforms (sinewaves) and study the resulting waveform and spectrum. You can also perform an analysis of an input waveform, to see how a given sound can be represented in terms of a sum of sinewaves. More information.