EAR Lab Home

 

SOFTWARE

Frequency Lowering Fitting Assistants

 

 

TEST STIMULI

PRESTO-R Test (Perceptually Robust English Sentence Test Open-set – Revised)

 

s-sh Confusion Test: Adult Version, Child Version

 

Sinusoidal Pole And Noise (SPAN) test signals: 750 ms, 1500 ms, 3000 ms

 

 

RESEARCH ARTICLES

Rallapalli, V., and Alexander, J.M. (2019).  “Effects of noise and reverberation on speech recognition with variants of a multichannel adaptive dynamic range compression scheme,” International Journal of Audiology.  In press.

 

Alexander, J.M. (2019).  “The s-sh confusion test and the effects of frequency lowering,” J. Speech Lang. Hear. Res., 62, 1486-1505.

 

Alexander, J. M., and Rallapalli, V., (2017).  “Acoustic and perceptual effects of amplitude and frequency compression on high-frequency speech,” J. Acoust. Soc. Am., 142, 908-923.

 

Brennan, M. A., Lewis, D., McCreery, R., Kopun, and J., Alexander, J. M. (2017).  “Listening effort and speech recognition with frequency compression amplification for children and adults with hearing loss,” J. Am. Acad. Audiol., 28, 823-837.

 

Lllanos, F., Alexander, J. M., Stilp, C. E., and Kluender, K. R. (2017).  "Power spectral entropy as an information-theoretic correlate of manner of articulation in American English," J. Acoust. Soc. Am., 141, EL127-EL133.

 

Winiger, A., Alexander, J. M., and Diefendorf, A. (2016).  “Minimal hearing loss: From a failure based approach to evidence based practice,” Am. J. Audiol., 25, 232-245.

 

Plotkowski, A., and Alexander, J. M. (2016).  “A sequential sentence test paradigm using revised PRESTO sentence lists,” J. Am. Acad. Audiol., 27, 647-660.

 

Alexander, J. M. (2016).  “Nonlinear frequency compression: Influence of start frequency and input bandwidth on consonant and vowel recognition,” J. Acoust. Soc. Am., 139, 938-957.

 

Brennan, M. A., McCreery, R., Kopun, J., Alexander, J. M., Lewis, D., and Stelmachowicz, P. G. (2016).  “Masking release in children with hearing loss when using amplification,” J. Speech Lang. Hear. Res., 59, 110-121.

 

Rallapalli, V., and Alexander, J. M. (2015). “Neural-Scaled Entropy predicts the effects of nonlinear frequency compression on speech perception,” J. Acoust. Soc. Am., 138, 3061-3072.

 

Alexander, J. M., and Masterson, K. M. (2015).  “Effects of WDRC release time and number of channels on output SNR and speech recognition,” Ear and Hearing, 36, e35-e49.

 

Brennan, M. A., McCreery, R., Kopun, J., Alexander, J. M., Lewis, D., and Stelmachowicz, P. G. (2014).  “Paired comparisons of nonlinear frequency compression, extended bandwidth, and restricted bandwidth hearing-aid processing for children and adults with hearing loss,” J. Am. Acad. Audiol., 25, 983-998.

 

Alexander, J. M., Kopun, J.G., and Stelmachowicz, P. G.  (2014).  “Effects of frequency compression and frequency transposition on fricative and affricate perception in listeners with normal hearing and mild to moderate hearing loss,” Ear and Hearing, 35, 519-532.

 

McCreery, R. W., Alexander, J. M., Brennan, M. A., Hoover, B., Kopun, J., and Stelmachowicz, P. G.  (2014).  “The influence of audio-visual exposure on speech recognition with nonlinear frequency compression for children and adults with hearing loss,” Ear and Hearing, 35, 440-447.

 

Alexander, J. M., Jenison, R. L., Kluender, K. R. (2011).  “Real-time contrast enhancement to improve speech recognition,” PLoS ONE 6(9), e24630, doi:10.1371/journal.pone.0024630.

 

Alexander, J. M., and Kluender, K. R. (2010).  “Temporal properties of perceptual calibration to local and broad spectral characteristics of a listening context,” J. Acoust. Soc. Am., 128, 3597-3613.

 

Stilp, C. E., Kiefte, M., Alexander, J. M., and Kluender, K. R (2010).  “Cochlea-scaled spectral entropy predicts rate-invariant intelligibility of temporally distorted sentences,” J. Acoust. Soc. Am., 128, 2112-2126.

 

Stilp, C. E., Alexander, J. M., Kiefte, M., and Kluender, K. R.  (2010).  Auditory color constancy: Calibration to reliable spectral properties across speech and nonspeech contexts and targets,” Attent., Percept. & Psychophys., 72, 470-480.

 

Alexander, J. M., and Kluender, K. R. (2009).  “Relativity of spectral tilt change in stop consonant perception by hearing-impaired listeners,” J. Speech Lang. Hear. Res., 52, 653-670.

 

Alexander, J. M., and Kluender, K. R. (2008).  “Relativity of spectral tilt change in stop consonant perception,” J. Acoust. Soc. Am., 123, 386-396.

 

Alexander, J. M., and Lutfi, R. A. (2008).  “Sample discrimination of frequency by hearing-impaired and normal-hearing listeners,” J. Acoust. Soc. Am., 123, 241-253.

 

Alexander, J. M., and Lutfi, R. A. (2004).  “Informational masking of tones in hearing-impaired and normal-hearing listeners: Sensation level and decision weights,” J. Acoust. Soc. Am., 116, 2234-2247.

 

Lutfi, R. A., and Alexander, J. M. (2005).  “Effects of informational maskers within and across trials,” J. Acoust. Soc. Am., 118, 322-324.

 

Lutfi, R. A., Oh, E., Storm, E., and Alexander, J. M. (2005).  “Classification and identification of recorded and synthesized impact sounds by practiced listeners, musicians and nonmusicians,” J. Acoust. Soc. Am., 118, 393-404.

 

 

REVIEW ARTICLES

Alexander, J.M. (2019).  Frequency Compression and Transposition.  In J. S. Damico & Martin J. Ball (eds.), The Sage Encyclopedia of Human Communication Sciences and Disorders (Sage: Thousand Oaks), pp. 781-784.

 

Alexander, J. (2016).  “20Q: Frequency Lowering Ten Years Later - New Technology Innovations,” AudiologyOnline, Article #18040.

 

Alexander, J. M. (2016).  Hearing aid delay and current drain in modern devices.  Canadian Audiologist, 3(4).

 

Angelo, K., Alexander, J. M., Christiansen, T. U., Jespersen, C. F. (2015).  Oticon frequency composition.  Oticon White Paper.

 

Alexander, J. M. (2014).  “How to use probe microphone measures with frequency-lowering hearing aids,” Audiology Practices, 6(4), 8-13.

 

Alexander, J. M. (2013).  “Individual variability in recognition of frequency-lowered speech,” Semin. Hear., 34, 86-109.

 

Mueller, H. G., Alexander, J. M., & Scollie, S. (2013).  “Frequency lowering amplification: function, clinical applications, and practical tips,” AudiologyOnline, Article #23076.

 

Alexander, J. (2013).  “20Q: The Highs and lows of frequency lowering amplification,” AudiologyOnline, Article #11772.

 

Mueller, H. G., Alexander, J. M., & Scollie, S. (2013).  “20Q: Frequency lowering - the whole shebang,” AudiologyOnline, Article #11913.

 

Alexander, J. M. (2003).  “Multidimensional Detection Theory,” DOI: 10.13140/RG.2.1.2258.0884.

 

 

CONFERENCE PROCEEDINGS

Bouman, T., Barnard, A., and Alexander, J. M. (2017).  “Continued drive signal development for the carbon nanotube thermoacoustic loudspeaker using techniques derived from the hearing aid industry,” SAE Technical Paper, 2017-01-1895, doi:10.4271/2017-01-1895.

 

Stilp, C. E., and Alexander, J. M. (2016).  “Spectral contrast effects in vowel categorization by listeners with sensorineural hearing loss,” Proceedings of Meetings on Acoustics, 25, doi: 10.1121/2.0000233.

 

Milvae, K., Alexander, J. M., Strickland, E. A. (2015).  “Is cochlear gain reduction related to speech-in-babble performance?” International Symposium on Auditory and Audiological Research.

 

Alexander, J. M., and Hariram, V. (2013).  “Neural-scaled entropy as a Model of Information for Speech Perception,” Proceedings of Meetings on Acoustics, 19, 050179, doi: 10.1121/1.4799891.

 

 

BOOK CHAPTERS

Kluender, K. R., and Alexander, J. M. (2007).  “Perception of speech sounds,” in P. Dallos and D. Oertel (Eds.) Handbook of the Senses: Audition (Elsevier: London).

 

 

PATENTS

J. M. Alexander (2018).  “Enhancing perception of frequency-lowered speech” (Patent No. US 10,083,702 B2).

 

R. L. Jenison, K. R. Kluender, and J. M. Alexander (2017).  “System and method for selective enhancement of speech signals” (Patent No. US 9,706,314 B2).

 

J. M. Alexander (2015).  “Enhancing perception of frequency-lowered speech” (Patent No. US 9,173,041 B2).

 

 

Invited Talks

Alexander, J. M. (2019).  Comparison of PHIG results with listening data and further modification and optimization of peak-height insertion gain (ANSI S3/WG48 working group, Columbus, Ohio).

 

Alexander, J. M. (2019).  Frequency-lowering technologies to improve hearing.  Indiana Clinical and Translational Sciences Institute Retreat (West Lafayette, Indiana).

 

Alexander, J. M. (2018).  Wide dynamic range compression: The good, the bad, and the ugly.  Convention of the Kansas Speech and Hearing Association (Wichita, Kansas).

 

Alexander, J. M. (2018).  Adaptive nonlinear frequency compression reveals mechanisms for perception of frequency-lowered speech.  Convention of the Kansas Speech and Hearing Association (Wichita, Kansas).

 

Alexander, J. M. (2018).  Potential mechanisms for perception of frequency-lowered speech.  University of Iowa Department of Communication Sciences and Disorders Professional Seminar Series (Iowa City, Iowa).

 

Alexander, J.M. (2018).  Audiologic Evaluation of the Tympan Open Source Hearing Aid.  Meeting of the Acoustical Society of America (Minneapolis, Minnesota).

 

Alexander, J. M. (2017).  Enhancing perception of frequency-lowered speech.  Palm Springs Hearing Seminar (Palm Springs, California).

 

Alexander, J. M. (2017).  The trials and tribulations of using Frequency compression to amplify speech.  Palm Springs Hearing Seminar (Palm Springs, California).

 

Alexander, J. M. (2017).  Nonlinear frequency compression - what’s in and out.  Canadian Academy of Audiology Conference (Ottawa, Canada).

 

Alexander, J. M. (2017).  Signia Expert Series: Nonlinear Frequency Compression for the Busy Clinician.  AudiologyOnline, Course #29400.

 

Alexander, J. M. (2016).  Insights into nonlinear frequency compression, past, present, and future.  Sonova (Stäfa, Switzerland).

 

Alexander, J. M. (2016).  What every audiologist needs to know about speech perception.  2016 Annual Signia Student University (Piscataway, New Jersey).

 

Alexander, J. M. (2016).  The role of neuroscience in the rehabilitation of hearing loss with hearing aids.  Purdue Institute for Integrative Neuroscience (West Lafayette, Indiana).

 

Alexander, J. M. (2016).  Development and implementation of a sequential sentence test paradigm using revised PRESTO sentence lists.  Speech Research Laboratory of David Pisoni (Bloomington, Indiana).

 

Alexander, J. M. (2015).  The hearing aid fitting process for frequency lowering amplification.  Purdue Crossroads Conference (West Lafayette, Indiana).

 

Alexander, J. M. (2015).  The trials and tribulations of amplifying speech for sensorineural hearing loss.  Starkey Audiology Research Seminar Series.

 

Alexander, J. M. (2015).  Results on a method of frication translocation.  Oticon (Copenhagen, Denmark).

 

Alexander, J. M. (2015).  Success or failure: The algorithm might be good, but not the fitting.  Seventh International Forum for Hearing Instruments Developers (Oldenburg, Germany).

 

Alexander, J. M. (2015).  Information for perception of speech distorted by sensorineural hearing loss.  UC Berkeley Department of Psychology, Invited Colloquium (Berkeley, California).

 

Alexander, J. M. (2015).  Frequency lowering techniques and results from the Purdue EAR Lab.  Starkey Hearing Research Center (Berkeley, California).

 

Alexander, J. M. (2014).  Hearing aid solutions for the speech-in-noise problem.  AudiologyOnline, Course #24917.

 

Alexander, J. M. (2014).  Everything you wanted to know about frequency lowering amplification.  Convention of the Kansas Speech and Hearing Association (Kansas City, Kansas).

 

Alexander, J. M. (2014).  Clinical considerations for using frequency lowering amplification.  National Center for Rehabilitative Auditory Research (NCRAR) Monthly Seminar Series (Portland, Oregon).

 

Alexander, J. M. (2014).  Hearing aid solutions for the speech-in-noise problem.  3rd Annual Siemens Student University (Piscataway, New Jersey).

 

Alexander, J. M. (2013).  Research in frequency lowering.  Oticon (Copenhagen, Denmark).

 

Alexander, J. M. (2013).  Individual variability in recognition of frequency-lowered speech.  AudiologyOnline, Course #23437.

 

Alexander, J. M. (2013).  Clinical applications of frequency lowering.  2nd Annual Siemens Student University (Piscataway, New Jersey).

 

Alexander, J. M., Hariram, V. (2013).  Neural-scaled entropy as a model of information for speech perception.  21st International Congress on Acoustics (Montreal, Canada).

 

Alexander, J. M. (2012).  Frequency lowering in hearing aids.  Indiana Speech-Language-Hearing Association Conference (Indianapolis, Indiana).

 

Alexander, J. M. (2011).  Selection and verification of frequency-lowering technology.  Nebraska Speech-Language-Hearing Association Conference (Kearney, Nebraska).

 

Alexander, J. M., Bentler, R. A. (2010).  Update on frequency-lowering techniques in hearing aids.  American Speech-Language-Hearing Association Conference (Philadelphia, Pennsylvania).

 

Alexander, J. M. (2010).  The effects of nonlinear frequency compression on speech information.  Boys Town National Research Hospital Colloquium (Omaha, Nebraska).

 

Alexander, J. M. (2010).  The effects of nonlinear frequency compression on speech information.  Hearing Aid Laboratory of Ruth Bentler (Iowa City, Iowa).

 

Alexander, J. M. (2010).  Maximizing benefit from nonlinear frequency compression.  4th Phonak Virtual Audiology Conference.

 

Alexander, J. M. (2010).  Considerations and techniques for frequency lowering in hearing aids.  GN ReSound-TRUE Research Conference (St. Petersburg, Florida).

 

Alexander, J. M. (2009).  Current frequency lowering options in hearing aids.  American Speech-Language-Hearing Association Conference (New Orleans, Louisiana).

 

Alexander, J. M. (2009).  Candidacy, selection, and verification of SoundRecover options.  3rd Phonak Virtual Audiology Conference.

 

Alexander, J. M. (2004).  A molecular analysis of complex tone discrimination by normal-hearing and hearing-impaired listeners.  University of Wisconsin Department of Communicative Disorders Colloquium.

 

Alexander, J. M., Lutfi, R. A. (2004).  Listening weights for signals and maskers with uncertain frequency in normal-hearing and hearing-impaired listeners.  Special Session honoring the work of Charles S. Watson at the Meeting of the Acoustical Society of America (New York, New York).

 

 

 

 

 

 

 

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