title: Group amplification in schools for the hearing impaired.
abstract: In the present field study, ambient noise levels and the status of group FM-wireless amplification systems were examined in 19 classrooms for the hearing impaired. Classroom noise was judged to be unacceptably high thus justifying the need for group amplification devices. Physical inspection of the group systems revealed defects in approximately one-half of the 28 teacher and 89 student amplification units. The electroacoustic measurements showed wide variability in performance among systems. There also appeared to be no systematic relationship between the degree of hearing loss of the children and the amount of unit gain being employed by each specific amplification system.
mesh_terms: D000669:Amplifiers, Electronic; D002648:Child; D003638:Deafness / Q000628:therapy*; D004519:Education, Special; D006310:Hearing Aids / Q000592:standards; D006801:Humans; D008144:Loudness Perception; D009622:Noise; D010469:Perceptual Distortion; D010898:Pitch Perception