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Related Experiment Videos

Digital signal processing hearing aids, personal FM systems, and interference: is there a problem?

John Bamford1, Mary Hostler, Gareth Pont

  • 1Human Communication and Deafness Group, University of Manchester, Manchester, United Kingdom.

Ear and Hearing
|June 7, 2005
PubMed
Summary

Digital signal processing (DSP) hearing aids can generate radio frequency interference that disrupts personal FM systems. Manufacturers should use low electromagnetic interference processors to ensure audibility and audio quality.

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Area of Science:

  • Audiology
  • Electromagnetic Compatibility

Background:

  • Personal FM systems are crucial assistive listening devices for individuals with hearing impairments.
  • Digital signal processing (DSP) hearing aids are increasingly common, but their electromagnetic compatibility with other devices is a concern.

Purpose of the Study:

  • To investigate conducted radio frequency interference from DSP hearing aids.
  • To assess the impact of this interference on personal FM system performance.
  • To identify practical solutions for mitigating interference.

Main Methods:

  • Tested 16 DSP hearing aids for radio frequency interference (RFI) using FM shoe and direct audio input (DAI) leads.
  • Measured spectral characteristics of RFI in a screened chamber.
  • Conducted subjective listening tests with various FM systems and DSP hearing aids.

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Main Results:

  • Most DSP hearing aids produced measurable RFI, with some exhibiting high levels.
  • Interference levels were sufficient to significantly impede FM system signal perception.
  • Subjective tests confirmed audible, unpleasant, and detrimental effects on audio quality.

Conclusions:

  • DSP hearing aids without low electromagnetic interference processors should not be fitted if FM systems are required.
  • Encourage manufacturers to integrate low EMI processors in DSP hearing aid design.
  • Advise users to maximize FM signal strength and switch off receivers when not in use.