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Instrumentation for transient evoked otoacoustic emissions elicited by maximum length sequences.

A system for recording Transient Evoked Otoacoustic Emissions (TEOAE) for neonatal screening, utilizing Maximum Length Sequences (MLS) for the generation of stimulus signals, is described. The main advantage of the system is its ability to obtain responses within a very short period of time, compare...

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Published in:Scandinavian Audiology Vol. 27; no. 1; pp. 37 - 43
Main Authors: Johannesen PT, Rasmussen AN, Osterhammel PA
Format: equations & formulas tables/charts tracings Journal Article
Published: Taylor & Francis Ltd 4/20/98
Online Access:View this record in EBSCOhost
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      jtl: Scandinavian Audiology
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      dt: 4/20/98
      vid: 27
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      pub: Taylor & Francis Ltd
      place: Philadelphia, Pennsylvania
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        atl: Instrumentation for transient evoked otoacoustic emissions elicited by maximum length sequences.
      aug:
        au:
          Johannesen PT
          Rasmussen AN
          Osterhammel PA
        affil: Audiological Laboratory, F 2072 Department of Otolaryngology, Head and Neck Surgery, Rigshospitalet, Blegdamsvej 9, DK-2100 Copenhagen 0, Denmark; e-mail: RH02769@RH.DK
      sug:
        subj:
          Otoacoustic Emissions, Spontaneous Evaluation
          Hearing Screening Methods
          Acoustic Impedance Tests In Infancy and Childhood
          Infant, Newborn
          Electric Stimulation Equipment and Supplies
          Noise
          Cochlea Physiology
          Reaction Time
          Algorithms
          Reliability
          Infant, Newborn: birth-1 month
      ab: A system for recording Transient Evoked Otoacoustic Emissions (TEOAE) for neonatal screening, utilizing Maximum Length Sequences (MLS) for the generation of stimulus signals, is described. The main advantage of the system is its ability to obtain responses within a very short period of time, compared to conventional OAE systems. The actual recording time for the MLS system is reduced by a factor of between 10 and 20 for comparable signal-to-noise ratios. Stimulus levels range from 50 to 90 dB peak equivalent SPL and available stimulus rates are 31, 62, 125, 250, 500, 1000 and 2000/sec. A dynamic noise rejection algorithm is performed during data collection, and, moreover, all sweeps (both accepted and rejected) are stored in memory so that the signal-to-noise ratio can be optimized by post-processing immediately after data collection. As a result, robust response can be achieved even if the subject is noisy during the test. A new semi-non-linear recording technique is described, combining the benefits from the conventional linear and non-linear recording methods. Examples of adult and neonatal responses under different conditions are provided to demonstrate the value of the recording principle.
      pubtype: Academic Journal
      doctype:
        equations & formulas
        tables/charts
        tracings
        Journal Article
      ougenre: Article
    language: English
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