LING 3P97 Lecture Notes - Lecture 6: Audiometer, Audiogram, Middle Ear
Document Summary
Recall: ear is most sensitive to sounds between 1000 and 4000 hz: mostly set for a young adult"s ear o. Need increased sound pressure to respond outside of this range. Audiometer accounts for this through calibration corrects for these differences. Marking both left and right ear in the same box. Quieter at the top, louder at the bottom db hl vs db spl. Y-axis marked by db hl: represents the lowest normal hearing level (averaged across normal hearing listeners) for each frequency, normalizes the audibility curve db spl can be determined using ansi ( see table 5. 1) You present a 1000 hz tone at 50 db hl using supra-aural ear phones. How many db spl is that sound: use ansi standards db spl = db hl + ansi value db spl = 50 db + 7. 5 db spl = 57. 5. Symbols for r and l ear line up with patient. Can only understand shouted or amplified speech (ie shouting)