What is articulation index acoustics?

In audiology, the Articulation Index (AI) is a tool used to predict the amount of speech that is audible to a patient with a specific hearing loss. The AI figure for a given patient can range from zero to one, representing the proportion of the average speech signal that is audible.

How to calculate the Articulation Index?

The articulation index can be calculated from the levels of the masking signal and the speech level in the frequency bands. The contribution of each frequency band to speech intelligibility is defined as 12 dB plus the sound level of the speech less the masking level.

What is articulation index in NVH?

Articulation Index (AI) is a sound metric that was developed to indicate how much background sound levels can interfere with human speech. It has a value that ranges between 0% (no speech understood) to 100% (all speech understood).

How is speech intelligibility assessed by articulation index?

The Articulation Index is defined as “a weighted fraction representing, for a given speech channel and noise condition, the effective proportion of the normal speech signal which is available to a listener for conveying speech intelligibility” (Kryter, 1962[a], p. 1689).

How is audibility measured?

A pure tone audiometry test measures the softest, or least audible, sound that a person can hear. During the test, you will wear earphones and hear a range of sounds directed to one ear at a time. The loudness of sound is measured in decibels (dB).

What is SII in hearing?

Answer. The SII score is a way of quantifying the likely intelligibility of speech based on the proportion of speech cues that are audible.

How count dots audiogram?

The Count-the-Dots Audiogram provides a way to estimate the ability to hear the acoustic energy of speech sounds. The more dots that occur below your hearing threshold line, the more speech energy you will perceive. This is a score out of 100.

What is percentage articulation?

Percentage Articulation Loss of Consonants is an indication of the loss of speech intelligibility that occurs in difficult acoustic environments. This calculation provides %ALCONS values for an unaided voice with a Q (or directivity) of 2, and for loudspeakers with a selectable coverage pattern.

What is a good SII?

These data show that an SII of 0.7 really is good enough.

What is Dot audiogram?

The SII Count-the-Dots Audiogram represents speech produced at an average loudness of 45 dBHL (conversational speech). In a classroom setting, the teacher’s voice is often at 50 to 60 dBHL, changing dynamically based on distance from the student, background noise, time of day, and vocal emphasis during instruction.

How do you calculate hearing loss percentage?

(1) The percentage of hearing loss for purposes of compensation for occupational deafness shall be determined by calculating the average, in decibels, of the thresholds of hearing for the frequencies of 500, 1,000, 2,000, and 3,000 hertz in accordance with paragraph (2) of this subsection. (ii) dividing the total by 4.