title: Recognition of simulated telephone speech by cochlear implant users.
abstract: OBJECTIVE
  To evaluate cochlear implant users' understanding of telephone speech.
  
  
  METHODS
  Telephone speech was simulated by band-limiting broadband speech stimuli. Multitalker vowel, consonant, and sentence recognition was measured for both simulated telephone speech and broadband speech in 10 postlingually deafened adult cochlear implant users. The study was approved by the St. Vincent's Hospital institutional review board, and signed, informed consent was obtained from all participants.
  
  
  RESULTS
  There was no significant difference in vowel recognition scores between broadband and telephone speech. However, mean consonant and sentence recognition scores were significantly poorer with telephone speech.
  
  
  CONCLUSIONS
  The limited telephone bandwidth significantly reduced cochlear implant users' understanding of telephone speech. The effect of band-limited speech was highly variable, suggesting that the contribution of high-frequency information to speech recognition varied significantly among the cochlear implant users.
authors.affiliation: House Ear Institute, 2100 West Third Street, Los Angeles, CA 90057, USA. qfu@hei.org
authors.forename: Qian-Jie
authors.initials: QJ
authors.lastname: Fu
authors.forename: John J
authors.initials: JJ
authors.lastname: Galvin
mesh_terms: D000328:Adult; D000368:Aged; D003054:Cochlear Implants; D003638:Deafness / Q000503:physiopathology* / Q000601:surgery*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D013067:Speech Perception; D013689:Telephone