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Overview of SFS

Operating environments

Supported Data Acquisition/Replay

Supported Graphics Devices & Files


Analysis programs

File formats

Subroutine libraries

Special purpose languages


SFS is only available by anonymous FTP from:

Look at Installation and Frequently Asked Questions for more information.

On-line documentation

All documentation and tutorials are available on line at:


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.


SFS is not public domain software, its intellectual property is owned by Mark Huckvale, University College London and others. However SFS may be used and copied without charge as long as the programs and documentation remain unmodified and continue 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.

Some other pages on our site you may enjoy:

Web Tutorial on Pitch

A tutorial that provides an extensive introduction to our sensation of the Pitch of sounds. 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.