Making Sense of Directional Microphone Hearing Aids

We have witnessed a large increase in the availability of directional microphone hearing aids over the past few years. Directional microphone technology is now available in analog, digitally controlled analog, and digital hearing aids, and has been implemented into both behind-the-ear and in-the-ear styles. This Short Course reviews basic design differences across directional microphone hearing aids. A number of different laboratory and clinical evaluation methods used for assessment of both electroacoustic and behavioral directivity are then reviewed. In addition, the potential impact of test conditions such as room reverberation and type and position of competing noise(s), on listener performance when fit with directional hearing aids are considered. Recommendations and suggestions relating to the clinical and laboratory assessment of directional hearing aids are provided.

[1]  H. Birk Nielsen.  A Comparison Between Hearing Aids with Directional Microphone and Hearing Aids with Conventional Microphone , 1973 .

[2]  Robert B. Schulein,et al.  Measurement and Intelligibility Optimization of Directional Microphones for Use in Hearing Aid Devices , 1997 .

[3]  M Valente,et al.  Recognition of speech in noise with hearing aids using dual microphones. , 1995, Journal of the American Academy of Audiology.

[4]  S. Soli,et al.  Development of the Hearing in Noise Test for the measurement of speech reception thresholds in quiet and in noise. , 1994, The Journal of the Acoustical Society of America.

[5]  D B Hawkins,et al.  Signal-to-noise ratio advantage of binaural hearing aids and directional microphones under different levels of reverberation. , 1984, The Journal of speech and hearing disorders.

[6]  B. B. Bauer,et al.  A Century of Microphones , 1962, Proceedings of the IRE.

[7]  Harry F. Olson,et al.  Music, Physics and Engineering , 1967 .

[8]  T Ricketts,et al.  Comparison of performance across three directional hearing aids. , 1999, Journal of the American Academy of Audiology.

[9]  John Borwick.  Microphones Technology and Technique , 1990 .

[10]  R M Cox,et al.  Relationship between two measures of aided binaural advantage. , 1984, The Journal of speech and hearing disorders.

[11]  R A Bentler,et al.  Longitudinal study of hearing aid effectiveness. I: Objective measures. , 1993, Journal of speech and hearing research.

[12]  J. Moncur,et al.  Binaural and monaural speech intelligibility in reverberation. , 1967, Journal of speech and hearing research.

[13]  Ruth A. Bentler,et al.  Longitudinal Study of Hearing Aid Effectiveness. II , 1993 .

[14]  Mueller Hg,et al.  The effects of various front-to-back ratios on the performance of directional microphone hearing aids. , 1979 .

[15]  T W Fortune.  Real-ear polar patterns and aided directional sensitivity. , 1997, Journal of the American Academy of Audiology.

[16]  V. M. A. Peutz.  Articulation Loss of Consonants as a Criterion for Speech Transmission in a Room , 1971 .

[17]  H G Mueller,et al.  Clinical rationale for using an overhead speaker in evaluation of hearing aids. , 1978, Archives of otolaryngology.

[18]  A. Nabelek,et al.  Effect of noise and reverberation on binaural and monaural word identification by subjects with various audiograms. , 1981, Journal of speech and hearing research.

[19]  C Ludvigsen,et al.  Effect of hearing aids with directional microphones in different acoustic environments. , 1978, Scandinavian audiology.