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Re: Articulation Index

John G. Beerends wrote:
If you want to measure speech intelligibility of coded speech
(distortion+noise) the AI can definitely not be applied. An option is to use
ITU-T recommendation P.862 that describes a method called Perceptual
Evaluation of Speech Quality

The method was developed for speech quality but in general speech quality
and intelligibilty are closely linked
There are many instances where speech intelligibility and quality are
not correlated. The LPC-10e (US Federal Standard - 1015) algorithm is an
example where intelligibility is high but quality is atrocious.

The Speech Transmission Index (Steeneen, H.J.M and Houtgast, T., "A
physical method for measuring speech-transmission quality", JASA, 67(1),
1980) might be a better objective measure of intelligibility than the AI
for systems with nonlinear distortion.

and the algorithm can be re-optimized
for intelligibility. A paper describing the method will be published
(probably this year) in the J. Audio Eng. Soc.

John Beerends
KPN Research

-----Original Message-----
From: Brent Edwards [mailto:brent@edwards.net]
Sent: donderdag 15 augustus 2002 0:51
Subject: Re: Articulation Index

If the coder is only introducing stationary additive noise to the speech,
then you can do this. If the perceptual coder is affecting the speech in a
way different from this (which I suspect it is), then you cannot apply the
AI (to my understanding of the Speech Intelligibility Index ANSI standard).

----- Original Message -----
From: "Hugo de Paula" <hugodepaula@GMX.NET>
Sent: Wednesday, August 14, 2002 12:56 PM
Subject: Articulation Index


The Articulation Index gives a measure of the intelligibility of hearing
speech in a given noise environment. I have some recordings that I used

perceptual coding techniques that caused distortion to these signals. I
would like to calculate the AI of  the distorced sound. As the AI is
calculated based on the environmental noise, I would use the reference

to measure the 'noise' in the distorted sound.


Hi Hugo,

Pardon, I can not help you, but I would like to know what means
"articulation index" for a pair of sounds.
What is the use of this figure?



Hugo de Paula wrote:

Hi all,

Does anybody know of a matlab code for calculating the Articulation


given a pair of sound files: the first with the original recorded



the other the live recording?

thank you,


D. Sen, PhD