and articulation in continuous speech. However, it also introduces an oral reading factor. Read speech can be evaluated for intelligibility using a five-point rating scale, with 1 indicating ...

A measure of the degree to which background noise interferes with or masks speech. It is obtained by averaging the Sound Pressure Levels ... voice levels are possible with an Articulation Index of 0.5 ...

His speech is better than semi-intelligible in a face-to-face situation. Some new listeners, however, have difficulty understanding him, and comprehensibility is further reduced without visual cues.