The Peutz prediction algorithms for the Articulation Loss of consonants (ALcons) as published in 1988 (85th convention in Los Angeles) did not seem to get the attention they deserved in the acoustical society. Perhaps this is due to the confusion it may have stirred because of the totally different set of algorithms compared to the 1971 set, or perhaps due to the more complicated calculations, but likely most of all how and where to get the physical quantities needed for input. This paper will deal with the underlying principles, how to extract the data from an impulse response and how to calculate the ALcons from that. It is thought that this will be a valuable addition to the well known STI measurements because the data can be narrow band (one octave wide) and is in the gathering not sensitive for signal processors in the signal chain or for the type of filters used in the post processing of the data. For the attendees to the presentation of this paper there will be a computer program available which reads a set of measured or calculated impulse responses, extracts the data, calculates the ALcons and presents the results.
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