Re: Articulation Index ("D. Sen" )

Subject: Re: Articulation Index
From:    "D. Sen"  <dsen(at)IEEE.ORG>
Date:    Fri, 16 Aug 2002 10:44:07 -0400

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
> 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

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(at)edwards.net]
> Sent: donderdag 15 augustus 2002 0:51
> To: AUDITORY(at)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(at)GMX.NET>
> To: <AUDITORY(at)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
>>>
>


--
D. Sen, PhD
http://www.auditorymodels.org/~dsen