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Field Measurements of Electromagnetic Interference in Hearing Aids
This investigation was a preliminary field study to determine the acoustic and perceptual characteristics of hearing aid distortion generated by digital wireless telephones, the usability of the telephones under field conditions, and the extent of bystander interference under field conditions. A two-channel analog-to-digital converter was used to monitor voltages generated by an acoustic (real-ear) and electromagnetic probe. Digital recordings of interference and speech plus interference were made on a laptop computer. Fifty-three hearing aid wearers listened to interference and speech plus interference through personal communication service 1900 and time division multiple access digital wireless telephones and rated them in terms of annoyance experienced and usability of the wireless telephone. Ratings of annoyance were also done for the bystander condition. Approximately 80 percent of the sample rated the telephones as unusable; on the other hand, 70 to 90 percent experienced no annoying interference from telephones being used by another person seated nearby (bystander condition).
Abbreviations: BTE = behind the ear, CDMA = code division multiple access, EM = electromagnetic, PBX = private branch exchange, PCS = personal communication service, RF = radio frequency, TDMA = time division multiple access
Article published online:
02 March 2022
© 2001. American Academy of Audiology. This article is published by Thieme.
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