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As computer modelling of the auditory system increases in complexity, the need for common working tools becames more pressing. Such tools are necessary to allow the rapid dissemination of new computer code, and to permit other members of the scientific community to replicate and challenge published results.

The LUTEar Core Routines Library (CRL) brings together established models, developed by the group, and also contributed by other researchers in the field, which simulate various stages in the auditory process. Since the first release, the LUTEar CRL has been tested and used both at the originating laboratory and at many other sites. It has been used as a tool for speech processing, speech and voice analysis as well as in the investigation of auditory phenomena, for which it was primarily constructed. This latest version of the CRL is a product of the proving ground to which it was subjected, and we hope that it will be as well received as was the first version.

The auditory models developed by the Speech and Hearing Laboratory, at Loughborough University of Technology (UK.), have received much attention, due principally to their simple form and the many published papers in which the models are used to explain auditory phenomena. The many requests for the computer code of the model simulations led to the group releasing the LUTEar Core Routines Library (CRL, version 1.0.0, October 1993) as a computational platform and set of coding conventions which supports a modular approach to auditory system modelling. The system is written in ANSI-C and works on a wide range of operating systems. LUTEar has now been consolidated and much improved in the latest release (version 2.0.8 ).

Included with this release is a comprehensive series of test programs. These programs were used to test the CRL routines; they reproduce the behaviour of the respective published models included. The programs also provide examples of how the CRL may be used in auditory investigation programs. In addition the programs read data from parameter files, and thus can be readily used to investigate further the behaviour of the models included in the CRL.

The CRL routines have been subjected as much as possible to careful and exhaustive testing. No system, however, is infallible so it is hoped that, with the gentle admonitions of the library's users, any problems or omissions will be quickly corrected. In addition it is expected that the library will be augmented by further models as the scientific endeavour continues. Many weeks have been required to get the manual into its current form. It is not perfect, so gentle admonitions and suggested changes/additions are invited.

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