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Usable Free Field Sound Pressures
Useful Free Field Hearing Area
8 other sections not shown
abnormal acoustic actual alternating amount amplifier assumed audible audible pressure audiometer becomes cause Chapter chart circuit considered contain correction creates curve decibels defective deliver depends describe desired determined direct dispenser distortion ear canal effects electrical endings enhancement exists Figure flow free field frequency response gain given hearing instrument hearing loss important increase indicate individual kind less limiting loudness maximum tolerable pressure means measured mechanism nerve normal normal ear observed obtained occurs octave operate output particular pass possible practical present pressure changes pressure limitation pressure wave produce proper properties pure tone range reason receiver reference relative represent residual hearing result sensitivity shown shows single sound cycles sound pressure sound pressure cycle specified speech sounds supplied Table threshold usable usually values variation varies