Improved Laboratory prototype electrolarynx (LAPEL): Using inverse filtering of the frequency response function of the human throat

  • Norton R
  • Bernstein R
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Abstract

The electrolarynx (EL) provides a valued means of verbal communication
for people who have lost their larynx. Existing ELs have some drawbacks
such as harsh, raucous, and unpleasant sound and the presence of
background noise. This study presents an experimental analysis of
two commerical ELs and describes the development and testing of an
improved LAb-oratory Prototype ELectrolarynx (LAPEL) which more accurately
simulates the sound of a natural larynx and has lower background
noise. This natural sound is obtained by determining the frequency
response function (FRF) of the tissue of the human neck and using
this information to tailor the input signal to the EL by inverse
filtering such that its output spectrum resembles that of the natural
larynx. The result was subjectively judged to have a superior and
more natural sound than existing electrolarynxes.

Author-supplied keywords

  • e-larynx

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Authors

  • Robert L Norton

  • Robert S Bernstein

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