UCL Enhance Home Page

UCL Enhance is a program for the enhancement of the intelligibility of speech recordings. The program incorporates a number of standard techniques for manipulating the overall amplitude of the signal and for the removal of steady-state additive noise. However, the program is unusual in its ability to detect and enhance selective regions of the speech signal based on their phonetic properties. This phonetically-sensitive method of enhancement was developed and evaluated in the Department of Phonetics and Linguistics at University College London under two research project grants funded by the UK Engineering and Physical Sciences Research Council.

For information about the scientific basis for the phonetic enhancement method, please refer to the publications listed in the Learn more section.

UCL Enhance is a simple application that is complete in itself but which is also designed to be compatible with the Speech Filing System (SFS) tools for speech research.

Read the UCL Enhance help file on-line.

Download and Installation

The latest version of UCL Enhance is only available by anonymous FTP from:

Download the EXE file run it to automatically unpack and install. This program runs on Windows platforms only.

Want to learn more?


These publications may be downloaded from the Enhance project web site at http://www.enhance.phon.ucl.ac.uk/.

Speech and Hearing

If you find the study of speech interesting and would like to know more, why not visit the Internet Institute of Speech and Hearing at www.speechandhearing.net ? There you will find tutorials, reference material, laboratory experiments and contact details of professional organisations.

Bug reports

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

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


UCLEnhance is not public domain software, its intellectual property is owned by Mark Huckvale, University College London. However UCLEnhance 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. UCLEnhance carries no warranty of any kind, you use it at your own risk.

Some other pages on our site you may enjoy:

ESECTION - Speech signal cross-sections

ESection is a free program for calculating and displaying spectral and other related analyses of sections of a speech signal. It can be used to demonstrate the different spectral properties of elements of speech. It can also calculate an LPC spectrum, autocorrelation and cepstrum analyses, and can display the signal as a waveform or as a spectrogram. It automatically finds formant and fundamental frequency values. More information.

EFxHist - Fundamental Frequency Histograms

EFxHist is a program to analyse joint speech and laryngograph recordings. EFxHist locates each pitch period in the laryngograph waveform and produces statistical analyses including distributions of fundamental frequency, closed-quotient, jitter and shimmer. More information.