How does the Glottal Enterprises system for automatically marking nasal consonants work? Is it reliable for patients having a speech disorder?
The theoretical basis for marking the approximate duration of a nasal consonant depends only on the presence of an oral closure and thus is valid for both normal and disordered speech. No judgment is made concerning the phonological intention of the speaker. As long as the oral passageway is open, the nasalance cannot rise above about 70% (assuming no strong obstruction in the nasal passages). When a complete closure of the oral passageway is approached (as in a nasal consonant), the nasalance will quickly rise above 70%. The NAS software identifies nasalance values above approximately 75% as being associated with an oral closure and, therefore, a nasal consonant. (If both nasal and oral passageways are closed, as in the closure of a stop consonant, both the nasal and oral energies will be small – that is, below threshold – and no nasalance value is computed.
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