SAR SH 535 Lecture Notes - Lecture 23: Auditory Brainstem Implant, Cochlear Implant, Hearing Aid
15 Dec 2019
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All the way back to animal horns and seashells used to gather soundwaves and direct them. Electronic amplification developed in late 19th century. Continue to evolve with circuits, computer technology. Most rapidly developing aspect of clinical practice (constantly new devices on the market) 1 make soft sounds audible (only soft sounds, not everything because then it gets too loud) Hearing aids have three major components, and additional things: microphone (pick up sounds from environment, amplifier (computer) that adjusts the sound in order to make it louder for some sounds and not for others, receiver (miniature loudspeaker) Analog circuits older make all sounds louder (do have some ability to program specific frequencies). But all they do is add decibels to the sound that is coming in. Digital circuits newer converts sound to numbers representing frequency, intensity and time patterns of signal through a/d converter then adjust signal and send back through d/a converter.
