In this paper, the results of a recent study on ALDs ("Assistive" Listening Devices) are summarized. The characteristics of four types of ALDs are compared with respect to existing applications, soundreception, power requirements, receiver requirements, coverage area, flexibility for expansion, and cost of installation. The four types studied are: a) induction loop systems; b) infrared systems; c) the AM (Amplitude Modulation) system; and d) the FM (Frequency Modulation) system. The first part of the investigation involved a review of all information/communication systems used at the Vancouver International Airport. Information was gathered through discussions with airport officials, a review of previous literature, and several airport walkthroughs. The second part of the investigation determined whether any of these information systems were capable of assisting people with hearing impairments. A task analysis of the travel process was conducted which included the use of videos, timetables, hearing announcements, etc., while using all the faculties provided at the airport. Finally a group discussion was held with people with hearing disabilities to ascertain what they required. The study showed that there was a real need for special listening devices and that the induction loop system was the most viable for airports.
Samenvatting