SFS/RTSPECT Version 2.4

Windows Tool for Real-time Waveforms & Spectra

RTSPECT is a free program for displaying a real time waveform and spectrum display of an audio signal. With RTSPECT you can monitor the waveform and spectral shape of sounds being played into the computer's microphone or line input ports. RTSPECT can display one or two-channel audio signals.

Release Notes

Version 2.6 - January 2013
Added cepstrum, smoothed spectrum, filterbank and auditory filterbank displays.
Version 2.4 - November 2006
Redesigned print layout with support for title
Version 2.2 - November 2003
Improved spectrum amplitude display.
Version 2.1 - July 2003
Option to set dynamic range.
Version 2.0 - September 2002
Add configuration options for sampling rate, frame rate and printing.

Sample Spectral Displays

Download and Installation

SFS/RTSPECT is only available from:

Download the file called rtspect260.exe into a temporary directory. Then find and run the file to unpack and install.

Want to learn more?

If you find the study of speech interesting, why not visit the Internet Institute of Speech and Hearing at www.speechandhearing.net ? There you will find tutorials, laboratory experiments, reference material, and details of e-mail lists and discussion groups.


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 program.


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

Some other pages on our site you may enjoy:

FAROSON - The Auditory Lighthouse

FAROSON is a free program for displaying a real-time scrolling coloured pattern from speech sounds. The aim is to construct a pattern that reflects our subjective sensations of loudness, pitch and timbre. The program may be useful in teaching about the nature of sound sensation. More information.

Web Tutorial on Pitch

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