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Articulation has of course many meanings. By knowing your background, I believe you mean “articulation” as measure of speech quality over an acoustic channel, "articulation”. There is one chapter (17.6.1) about subjective methods and measures, which discusses
11 different methods, and discusses briefly also articulation. The next chapter (17.6.2) is about objective methods and measures, which mentions 8 different approaches, and discusses very briefly articulation index. The book does not talk too much about them,
instead it talks for few pages about STI and ALcons, and also about methods based on auditory models, such as PESQ, POLQA, TOSQA, HASQI. Speech quality takes about 7 pages, sound quality in total about 31 pages, which means that the level of details is limited.
I pasted below some excerpts from the book covering articulation and articulation index. The process of producing speech, also called articulation, is discussed elsewhere in the book.
-Ville
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Different subjective and objective methods have been developed to measure the quality of speech, indicating the articulation, intelligibility, and quality of the reproduction of timbre (Quackenbush et al., 1988). We will list some relevant techniques and later present some of them in greater detail. 17.6.1 Subjective Methods and Measures
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17.6.2 Objective Methods and Measures
• Articulation index (AI). This was developed to measure speech intelligibility over a trans- mission channel that is assumed to be nearly linear, but, with disturbance caused by additive noise. The method assumes that the loss of articulation can be estimated
by summing the AI values over 20 frequency bands, following roughly the Bark scale.
• Percentage articulation loss of consonants (%ALcons) (Peutz, 1971). This is a simple and relatively often used estimate of speech intelligibility in a room, auditorium, or other large space. The %ALcons value is computed from the basic acoustic parameters
of the space. The method is described in Section 17.9.3.
• Speech transmission index (STI). The index is based on the modulation transfer function (MTF), and it can be used to estimate relatively reliably the effect of reverberation and additive noise of a transmission channel
on speech intelligibility. The method is described in Sections 17.7.1 and 17.7.2, and STIPA, a simplified version of STI, is discussed in Section 17.7.4.
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From: James Johnston <audioskeptic@xxxxxxxxx>
Reply-To: James Johnston <audioskeptic@xxxxxxxxx> Date: Tuesday 25 November 2014 07:56 To: "AUDITORY@xxxxxxxxxxxxxxx" <AUDITORY@xxxxxxxxxxxxxxx> Subject: Re: New book -- Communication acoustics: An introduction to Speech, Audio and Psychoacoustics
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