CV Apoux CNU - Department of Speech and Hearing Science

Frédéric C. Apoux, PhD
Research Scientist
Department of Speech and Hearing Science
Ohio State University
Columbus, OH 43210, USA
(+1) 614 292 8059
[email protected]
PROFESSIONAL ACTIVITIES
2008-...
Research Scientist
2007-2008
Post-doctoral Fellow
2006-2007
Post-doctoral Fellow
2002-2006
Faculty Research Associate
10/08-…
10/07-09/08
09/06-09/07
11/02-08/06
1999-2002
09/99-10/02
Department of Speech and Hearing Science, Ohio State University, USA
Department of Communication Sciences and Disorders, University of South Carolina, USA
Département d’Etudes Cognitives, Ecole Normale Supérieure, France
Department of Speech and Hearing Science, Arizona State University, USA
Research Scientist
Intrason France S.A., France
EDUCATION
2002
17/10/02
Ph.D. in Cognitive Psychology
Paris Descartes University, France
Title: “Contribution of enhancement to the investigation of the role of temporal envelope cues in
speech identification”
Advisor: Christian Lorenzi (Pr., Paris Descartes University)
1998
Master degree in Psychology
Paris Descartes University, France
TEACHING EXPERIENCE
Supervision and co-supervision
2001-2002
Nicolas Tribut (Nancy I University/Ecole d’Audioprothèse de Fougère, France)
Research thesis for the B.A. in Audiology
Topic: Evaluation of an expansion/compression algorithm for hearing aids (cf., Apoux et al., 2004)
1999-2002
Teaching Assistant
Psychology Dept., Paris Descartes University, France
Two courses at the undergraduate level:
n Methods in Experimental Psychology and Perceptual activities (20 hours; 1 group)
o Computing Sciences (180 hours; 5 groups)
RESEARCH INTERESTS
Main topics:
Temporal processing by the normal and the impaired ear
Effects of external and internal noise on speech understanding
Peripheral auditory filtering
Signal processing strategies for hearing aids and cochlear implants
Speech can be presented as a summation of frequency bands with amplitude-modulated signals. Each
frequency band consists of a fine structure and a temporal envelope. A number of behavioral studies
have provided overwhelming evidence that accurate speech recognition does not require the fine
spectral detail, suggesting that usable speech information is conveyed by the temporal envelope of
speech. My researches focus on the ability of the auditory system to follow slow amplitude changes at
the output of the auditory filters and use these changes in speech recognition tasks. More recently, my
research interests focused on the property of the auditory system to act like a frequency analyzer and
the consequences of this property on subsequent processing. In particular, I have been interested in
the auditory system’s ability to select and combine auditory channels’ output when listening to speech
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in noise. Most researches are conducted with normal and impaired ears. Efforts are continuously made
to propose improved or innovative speech processing strategies for hearing aids and cochlear implants.
PUBLICATIONS
Peer-reviewed articles
Apoux, F., and Healy, E. W. (in revision). “On the number of auditory filter width bands needed to
understand speech,” Journal of the Acoustical Society of America.
Apoux, F., and Bacon, S. P. (2008). “Differential contribution of envelope fluctuations across
frequency to consonant identification in quiet,” J. Acoust. Soc. Am. 123, 2792-2800.
Apoux, F., and Bacon, S. P. (2008). “Selectivity of modulation interference for consonant
identification in normal-hearing listeners,” J. Acoust. Soc. Am. 123, 1665-1672.
Apoux, F., and Bacon, S. P. (2004). “Relative importance of temporal information in various
frequency regions for consonant identification in quiet and in noise,” J. Acoust. Soc. Am. 116,
1671-1680.
Apoux, F., Tribut, N, Debruille, X., and Lorenzi, C. (2004). “Identification of temporally expanded
sentences in normal-hearing and hearing-impaired listeners,” Hear. Res. 189, 13-24.
Millman, R. E., Lorenzi, C., Apoux, F., Füllgrabe, C., Green, G. G. R., and Bacon, S. P. (2002). “Effect
of duration on amplitude-modulation masking,” J. Acoust. Soc. Am. 111, 2551-2554.
Apoux, F., Crouzet, O., and Lorenzi, C. (2001). “Temporal envelope expansion on speech in noise for
normal-hearing and hearing-impaired listeners: Effects on identification performance and
response times,” Hear. Res. 153, 123-131
Lorenzi, C., Berthommier, F., Apoux, F., and Bacri, N. (1999). “Effects of envelope expansion on
speech recognition,” Hear. Res. 136, 131-138.
Book chapters/Proceedings
Apoux, F., and Healy, E. W. (2008). “Phoneme recognition as a function of the number of auditory
filter outputs,” Proceedings of the Acoustics’08 (ISBN: 978-2-9521105-4-9).
Lorenzi, C., Füllgrabe, C., Sibellas, J., and Apoux, F. (2002). “Second-order temporal modulation
transfer functions in normal-hearing and hearing-impaired listeners,” Special issue of the
Revista de Acustica 33 (ISBN: 84-87985-06-8).
ABSTRACTS
Apoux, F., and Healy, E. W. (July, 2008). Phoneme recognition as a function of the number of
auditory filter outputs. 155th Meeting of the Acoustical Society of America. Paris, France.
Apoux, F., and Bacon, S. P. (November, 2004). Psychophysical evidence for the existence of envelope
information in the internal auditory representation of signal fine structure. 148th Meeting of
the Acoustical Society of America. San Diego, USA.
Apoux, F., and Bacon, S. P. (March, 2004). Relevant modulation frequencies for consonant
identification as revealed by MDI. American Auditory Society 2004 Meeting. Scottsdale, USA.
Apoux, F., and Bacon, S. P. (February, 2004). Frequency-weighting functions for temporal envelope
information used to identify consonants in quiet and in noise. 27th Meeting of the Association
for Research in Otolaryngology. Daytona Beach, USA.
Apoux, F., Garnier, S. and Lorenzi, C. (June, 2002). Consonant identification in noise: Effects of
temporal asynchrony, noise fluctuations and temporal envelope expansion. 143rd Meeting of
the Acoustical Society of America. Pittsburg, USA.
Apoux, F., Laurent, P., Garnier, S. & Lorenzi, C. (April, 2002). Speech identification with expanded
temporal envelope cues in hearing-impaired listeners: Effects of temporal envelope
enhancement on identification thresholds. 14th Annual Convention of the American Academy
of Audiology. Philadelphia, USA.
Apoux, F., Laurent, P. & Lorenzi, C. (October, 2001). Temporal enhancement of speech: Effects on
identification performance, identification thresholds and response times. 46th International
Congress of Hearing Aids Acousticians. Nuremberg, Germany.
Apoux, F., Laurent, P., Garnier, S. & Lorenzi, C. (September, 2001). Rehaussement d’enveloppe et
seuils d’identification de consonnes dans le bruit chez les malentendants. 5ème Congrès de la
Fédération Européenne des Sociétés d’Audiologie. Bordeaux, France.
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Apoux, F., Garnier, S. and Lorenzi, C. (June, 2001).Consonant recognition in noise with temporal
cues: III. Effects of temporal envelope enhancement on identification thresholds. 141st
Meeting of the Acoustical Society of America. Chicago, USA.
Apoux, F., Crouzet, O. and Lorenzi, C. (June, 2000). Consonant recognition in noise with temporal
cues: II. Effects of envelope enhancement on response times. 139th Meeting of the Acoustical
Society of America. Atlanta, USA.
Apoux, F., Lorenzi, C. and Berthommier, F. (June, 2000). Consonant recognition in noise with
temporal cues: I. Effects of temporal envelope enhancement on identification performance.
139th Meeting of the Acoustical Society of America. Atlanta, USA.
Apoux, F., Garnier, S., & Lorenzi, C. (September, 2000). Seuils d’identification de consonnes dans le
bruit: Effets du rehaussement des modulations d’amplitude. Journée “Audition-Jeunes
Chercheurs”. Lausanne, Switzerland.
Apoux, F., Bacri, N., Berthommier, F., & Lorenzi, C. (September, 2000). Effets du renforcement de
l’enveloppe temporelle sur l’identification de consonnes dans le bruit. 5ème Congrès Français
d’Acoustique. Lausanne, Switzerland.
Grosgeorges, A., Berthommier, F., Apoux, F., & Lorenzi, C. (June, 2000). Détection de la modulation
d'amplitude liée au voisement : Comparaison expérimentation-modélisation. XXIVèmes
Journées d'Etudes de la Parole. Aussois, France.
Apoux, F., Laurent, P., & Lorenzi, C. (April, 2000). Test d’un algorithme de renforcement temporel
du signal de parole. Journée d’etude des groupes Electroacoustique et Audition de la SFA.
Paris, France.
Apoux, F., Crouzet, O, Berthommier, F., Bacri, N., & Lorenzi, C. (October, 1999). Effet du
renforcement de l’enveloppe temporelle sur l’identification de consonnes dans le bruit.
Journée du Réseau Sciences Cognitives d'Ile-de-France. Paris, France.
Apoux, F., Berthommier, F., Bacri, N., & Lorenzi, C. (June, 1998). Effet du renforcement des
modulations temporelles en sous-bandes sur la reconnaissance de la parole: Résultats
préliminaires. XXIIèmes Journées d’Etudes de la Parole. Martigny, Switzerland.
Apoux, F., Berthommier, F., Bacri, N., Gallégo, S., & Lorenzi, C. (June, 1998). Speech recognition
with temporal cues: Effects of envelope enhancement. 4th European Symposium on Paediatric
Cochlear Implantation. Hertogenbosch. Netherland.
INVITED PRESENTATIONS and SEMINARS
Differential contribution of envelope fluctuations across frequency. Séminaire Parole du LORIA.
Nancy, France (April, 2007).
Psychophysical evidence for the recovery of amplitude modulation from fine structure. School of
Psychological Sciences. Newcastle, UK (April, 2007).
Differential contribution of envelope fluctuations across frequency to consonant identification.
Institute of Sound and Vibration Research. Southampton, UK (November, 2006).
Effet de l’expansion de l’enveloppe temporelle des sons de parole chez les sujets normo-entendants et
malentendants. Institut de la Communication Parlée. Grenoble, France (March, 2002).
PATENTS
A fundamental frequency processor to enhance speech understanding in CI patients
Publication number: Pending
Inventors: S. P Bacon, C. A. Brown, F. Apoux
Petitioner: AZ Tech
Speech envelope expansion/compression algorithm for digital hearing aids
Publication number: FR2846136 (April 2004)
Inventors: F. Apoux, C. Lorenzi
Petitioner: Intrason France S.A.
RESEARCH GRANTS
Pending
National Institute for Deafness and other Communication Disorders (PI)
Grant #DC009892: “Role of peripheral filtering in the unmasking of speech”
Total direct costs: $300,000
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Completed
1999-2002
CIFRE grant (PI)
Grant #289/99: Development and evaluation of speech enhancement algorithms for digital hearing aids
Co-investigators: Pr. Christian Lorenzi (Paris Descartes University), Pierre Laurent (Intrason)
1998-1999
“Fondation de l’Avenir pour la Recherche Médicale Appliquée” grant
Study #ET8-244: “Evaluation, suivi et rééducation de troubles auditifs centraux par audiométrie
temporelle”
Principal investigators: Pr. Christian Lorenzi (Paris Descartes University), Pr. Bruno Frachet (ENT)
SCIENTIFIC REVIEWS
Journals
Journal of the Acoustical Society of America
Ear and Hearing
Journal of Speech, Language, and Hearing Research
Grants
Competitive Earmarked Research Grant
Chinese University of Hong Kong (Hong Kong, China)
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