Re: Phonetic balance (Jont Allen )

Subject: Re: Phonetic balance
From:    Jont Allen  <jontalle@xxxxxxxx>
Date:    Fri, 14 Nov 2014 05:53:14 -0600

Dear Auditory List, There is some work by a student of mine, along with a follow up study, that may lead you to the conclusion that "phonetically balanced" mono-syllables may be the wrong way to measure speech perception, especially in the hearing impaired ears. What this research shows is that each spoken token has a threshold, which we call SNR90 (and some times, SNR50). This number is the SNR in dB, at which the token score goes from 100% correct (zero error) to 90 % correct (10% error, or 1 error in 10 trials). It turns out, and this seems a surprising result, that if you take each token, and normalize the error probability of error vs SNR function [Pe(SNR) = 1- Pcorrect(SNR)] by the SNR50 value, namely Pe(SNR-SNR50), then you get what looks like a step function for the ensemble average of all the tokens. The distribution of SNR50 values has a large variance. The slopes of these normalized error curves have a very steep slope, typically (10%/dB). The ensemble average of all these step functions gives you the articulation index formula for the error, exactly. Namely, this analysis explains the articulation index. Once you realize what is going on, it changes the entire way you look at the problem. My conclusion is that "phonetically balanced" is the wrong way to quantify speech perception, as it is working with the wrong variable (phone vs SNR50). Look at the data and decide for yourself. I will not try to convince you that this view is right, or wrong. 1) Riya Singh and Jont Allen (2012); "The influence of stop consonants’ perceptual features on the Articulation Index model," J. Acoust. Soc. Am., apr v131,3051-3068 (pdf <>) 2) Toscano, Joseph and Allen, Jont B (2014) /"Across and within consonant errors for isolated syllables in noise,/" Journal of Speech, Language, and Hearing Research, Accepted July 25, 2014; doi:10.1044/2014_JSLHR-H-13-0244, (JSLHR <>) These references are available at Jont Allen Univ of IL, Urbana IL On 11/14/2014 02:21 AM, Brian FG Katz wrote: > > Here is a work we did some years ago, creating a dataset of > phonetically balances French. The methodoly description could be of > some help to you. > > A. Raake and B. Katz, “SUS-based method for speech reception threshold > measurement in French,” in/Fifth Conf. on Language Resources > and//Evaluation (LREC)/, (Genoa, Italy), pp. 2028–2033, May 2006,(url) > <>. > > Alexandre Raake did the real work, so please contact him if you have > any questions. > > Good luck, > > -Brian > > -- > > Brian FG Katz, Ph.D, HDR > > Audio & Acoustique > > CNRSLIMSI - CNRS > Rue John von Neumann > Campus Universitaire d'Orsay > Bât 508 > 91405 Orsay cedex > > France > > Phone. + 33 (0)1 69 85 81 55 - Fax. + 33 (0)1 69 85 80 88 > <> web_group: > web_theme: > > > Ce message et toutes les pièces jointes sont confidentiels et établis > à l'intention exclusive de ses destinataires. > Toute utilisation ou diffusion non autorisée est interdite. > This message and any attachments are confidential and intended solely > for the addressees. > Any unauthorised use or dissemination is prohibited. > > *De :*AUDITORY - Research in Auditory Perception > [mailto:AUDITORY@xxxxxxxx *De la part de* Michal Soloducha > *Envoyé :* mercredi 12 novembre 2014 14:52 > *À :* AUDITORY@xxxxxxxx > *Objet :* Phonetic balance > > Dear colleagues, > > I search for some software which would help me to make my speech > material phonematically balanced. Is anybody aware of any solutions or > libraries (e.g. Matlab) which could be used for that? > > Best regards, > Michał Sołoducha > > -------------------------------------------- > > Michał Sołoducha, Ph.D. Student > > Assessment of IP-based Applications > > Telekom Innovation Laboratories (T-Labs) > > Technische Universität Berlin > > Ernst-Reuter-Platz 7 > > 10587 Berlin, Germany > > Phone: +49-30-835358384 > > Fax: +49-30-835358409 > > Email:michal.soloducha@xxxxxxxx <mailto:michal.soloducha@xxxxxxxx> > > <> > > -------------------------------------------- >

This message came from the mail archive
maintained by:
DAn Ellis <>
Electrical Engineering Dept., Columbia University