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articulation loss of consonants (ALcons)

ALcons, like the Speech Transmission Index (STI), is an evaluation method for speech intelligibility

in rooms and halls with sound. As can be seen from the name Alcons, it is the loss of articulation for consonants. Consonants play

a decisive role in speech intelligibility.Therefore, the Alcons rating is based on the percentage of consonants that are not acoustically correctly understood.

TheALcons value is given in percent and depends on the factors mentioned as well as on

thedirectional characteristics of

the loudspeakerboxes

, thebeam focusing, the distance of the listeners, the structure of the sound reinforcement room, its wall and floor conditions, the reflection and much more.

Evaluation of speech intelligibility according to the STI, SII index and ALcons

Evaluation of speech intelligibility according to the STI, SII index and ALcons

The factors mentioned are set in relation to each other at Alcons and the percentage Alcons values are determined from this. These can range from 100% to 0%, with the 100% value representing the worst speech intelligibility and the 0% value the best.

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Englisch: articulation loss of consonants - ALcons
Updated at: 15.11.2019
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Translations: DE