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Experiments with classroom FM amplification

A Boothroyd1, F Iglehart

  • 1Graduate School, City University of New York, New York 10036, USA.

Ear and Hearing
|July 10, 1998
PubMed
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FM amplification significantly benefits individuals with severe to profound hearing loss, improving speech recognition in quiet and noise. Adjusting microphone sensitivity is crucial for maximizing these benefits.

Area of Science:

  • Audiology
  • Speech and Hearing Sciences
  • Assistive Listening Devices

Background:

  • Severe and profound hearing loss presents significant challenges in speech perception.
  • Assistive listening devices, such as Frequency Modulated (FM) systems, are crucial for improving auditory access.
  • Optimizing FM system settings is essential for maximizing benefits for users.

Purpose of the Study:

  • To quantify the benefits of FM amplification for individuals with severe and profound hearing loss.
  • To compare the efficacy of body-worn versus behind-the-ear FM systems.
  • To evaluate the impact of reduced FM microphone sensitivity on speech recognition.

Main Methods:

  • Phoneme recognition was assessed in 13 teenage students with severe/profound hearing loss using consonant-vowel-consonant word lists.

Related Experiment Videos

  • Speech was presented via live voice with and without FM amplification (body-worn and behind-the-ear systems) in quiet and noise.
  • FM microphone sensitivity was systematically varied to assess its impact on speech recognition.

    • Main Results:

    • FM amplification significantly improved speech recognition, effectively doubling available auditory information.
    • Benefits were observed in both quiet and noisy conditions, with a slightly greater advantage in noise.
    • Reducing FM microphone sensitivity by 15 dB diminished the observed FM benefit.

    Conclusions:

    • FM amplification is valuable for individuals with severe and profound hearing loss, enhancing speech clarity in various listening environments.
    • The body-worn FM system demonstrated a slight advantage over the behind-the-ear system.
    • Current gain adjustment criteria may not be optimal for all users, particularly those with severe to profound hearing loss.