In 1958 we started a research project on speech intelligibility, that has until now gone on continuously, all be it not always with the same intensity and that has certainly not yet come to an end. Results of this research have been communicated and published at different meetings of the A.E.S., congresses I.C.A., and of the Dutch, German, and French acoustical societies. We will give here a summary of the most interesting results. Because of the limited time, however, we are restricted to a general outline of the theory and to define those ideas and relations that are fundamental to this theory. In an earlier paper given at the AES 75th Convention in Paris in 1984, preprint no. 2089, we presented many of our theories. This paper is primarily an extension of that earlier one, therefore only information required for subject understanding is repeated here.
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