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by: Petra Hansen


Marketplace > University of Florida > OTHER > SPA 5304 > PRIN AUDIOLOG EVAL
Petra Hansen
GPA 3.55

Scott Griffiths

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Scott Griffiths
Class Notes
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This 3 page Class Notes was uploaded by Petra Hansen on Friday September 18, 2015. The Class Notes belongs to SPA 5304 at University of Florida taught by Scott Griffiths in Fall. Since its upload, it has received 7 views. For similar materials see /class/206800/spa-5304-university-of-florida in OTHER at University of Florida.




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Date Created: 09/18/15
Katz Chapter 6 Transducers for Audiologic Testing What is a transducer Transducer a device that converts energy into energy For audiology two main types 1 Those that convert energy to energy microphones 2 Those that convert energy to acoustic or energy earphones loudspeakers and bone vibrators Selecting an appropriate transducer Price of a transducer depends on 1 the broadness of the response 2 the of its frequency response 3 its range 4 the of the signal that it must reproduce only an issue of very brief signals less that a few ms Transducers have a maX output If you push it beyond the maximum the output will be Must match the output impedance from the to the input impedance of the Air Conduction What is the use to the transducer 0 if you need to test ear at a time ear phones or insert instead of sound eld Is there too much ambient noise 0 use which have a better seal than supraaural ear phones not a problem with a sound booth Supraaural Earphones o Disadvantages I Air leak is possible without careful I Pressure on pinna can ear canal I Unable to r J signals 39J I frequency response I Creation of effect I Reduced l attenuation 0 Why do we still use them I For audiometric pure tone testing many of these disadvantages are not an issue I All of the studies from the last 50 years have used earphones I They re reliable I They re easy to use Circumaural Earphone Cushions 0 Use I To reduce the effect I For attenuating noise in the test booth I More that supra aural cushions 0 Problems I issues I Don t t standard I Use not recommended because ofthe issue Headset headband 0 Can t really separate from headband 0 Hand held ear phones I Have low I Low validity I Lack of t resulting in loss of sound I Inconsistent relationship between the and the eardrum I Increase in SPL if held too to the ear 0 Only advantage solves the problem of headbands not tting heads I Solution nd children s headband use inserts Insert Receivers ER3A 0 Uses atube coupled to athe ear by a insert 0 Advantages I Completely ll all but the most ear canals I Less effect than supraaurals I Less attenuation than supraaurals I Disposable o Disadvantages I Cannot use with a ear 0 Initial concerns about calibration have been resolved 0 Must be sure of a straight insertion to receive all bene ts Loudspeakers 0 used for testing tones speech and noise 0 when patient I will not headphones inserts I head is too for headphones I needed for a speci c HA eval CI eval 0 hard to calibrate 0 many factors affect testing head position standing waves etc Bone Conduction 0 used to measure reserve 0 not great for 0 minimal attenuation Microphones o transducer that changes signal to signal 0 modern microphones have a fairly and at response that makes it easier to modify its output 0 the speci c type of microphone needed in a situation depends on its Types of Microphones 0 Communication I When used simply to communicate with the patient and not for testing a microphone does not need a very frequency response range or broad dynamic range I However audiologists tend to use the same microphone for both speech testing and communication therefore the microphone be adequate for clear signals 0 Live voice testing I Here it is important that the microphone have a frequency response range to encompass all English phonemes


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