Effects of a nonlinear digital hearing aid amplifying in the time domain

Ken Ichi Kaneko, Kazuhiko Shoji, Hisayoshi Kojima, Masato Inoue, Ryo Asato, Iwao Honjo

Research output: Contribution to journalArticlepeer-review


The effects of a nonlinear, digital hearing aid on the perception of sentences in a quiet environment were examined for 12 patients with profound sensorineural hearing impairments. This hearing aid was equipped with a compression circuit, which divides the waveform in the time domain by zero-cross points, and then amplifies each waveform to an fixed amplitude. To reduce the susceptibility to background noise, input signals less than a certain level were amplified linearly, and this level was easily adjustable. Three out of 12 (25.0%) patients understood more than 50% of the phrases in typical Japanese sentences at all of the pre-set sound level (50, 60, 70 and 80 dBSPL). Furthermore, this device offered better perception than linear amplification (Rion HA70 or 73) in 8 out of 12 (66.7%) subjects, and was superior to the subjects' own linear hearing aids in 5 out of 10 (50.0%) cases. These results indicate that this hearing aid is beneficial for some subjects.

Original languageEnglish
Pages (from-to)139-144
Number of pages6
JournalPractica Otologica
Issue number2
Publication statusPublished - 1998
Externally publishedYes


  • Compression
  • Digital hearing aid
  • Nonlinear amplification
  • Sensorineural hearing impairment
  • Time domain

ASJC Scopus subject areas

  • Otorhinolaryngology


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