Re: Articulation Index

["John G. Beerends" <J.G.Beerends@xxxxxxx>]

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
http://www.itu.int/rec/recommendation.asp?type=folders&lang=e&parent=T-REC-P
.862.

The method was developed for speech quality but in general speech quality
and intelligibilty are closely linked 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
To: AUDITORY@LISTS.MCGILL.CA
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).
--Brent

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


> Well,
>
> The Articulation Index gives a measure of the intelligibility of hearing
> speech in a given noise environment. I have some recordings that I used
some
> 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
sound
> to measure the 'noise' in the distorted sound.
>
> Hugo.
>
> >
> > 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?
> >
> > Thanks,
> >
> > Regis
> >
> > Hugo de Paula wrote:
> > >
> > > Hi all,
> > >
> > > Does anybody know of a matlab code for calculating the Articulation
> Index
> > > given a pair of sound files: the first with the original recorded
source
> and
> > > the other the live recording?
> > >
> > > thank you,
> > >
> > > Hugo