Amplification Final

Question 1

Current Procedural Technology

Answer 1

codes for diagnostic procedures

Question 2

healthcare common procedure coding system

Answer 2

describes services or supplies not outlined in CPT
(not covered by medicare)

Question 3

ICD-10

Answer 3

classifying diagnosis or symptoms

Question 4

high viscosity

Answer 4

thick
provides aperture stretch
condensation cured silicone

Question 5

viscoity

Answer 5

how easily material flows

Question 6

medium visocity

Answer 6

provides some stretch of aperture
addition cured silcone

Question 7

low viscoity

Answer 7

runny loose
not change anatomy of ear
deep devices
addition cured

Question 8

addition cured silcone

Answer 8

provides 1:1 parts polyvinyl siloxane

Question 9

condensation cured silicone

Answer 9

dimethyl silxoane
paste and hardener

Question 10

methyl methacrylate

Answer 10

powder and liquid

Question 11

stress relaxation

Answer 11

material ability to return to shape after removal

Question 12

contraction ration

Answer 12

shrinkage over 7 day period
sillicone shirnks
methyl methacryalate shirnks

Question 13

shore value

Answer 13

after cure hardness
stability in box
silicone = high shore
methly metha = low shore

Question 14

open jaw impression

Answer 14

increases size of aperture for snugger fit
condyle of mandible moves forward,pulls anterior canal wall

Question 15

single impression

Answer 15

place horizontally on side of impression

Question 16

bi lateral impression

Answer 16

place vertically

Question 17

35% of speech intellgibilty comes from

Answer 17

2 khz

Question 18

3khz and higher adds how much speech intellgibilty ?

Answer 18

25%

Question 19

95% of speech intelggbilty comes from frequencies

Answer 19

5oo to 5khz

Question 20

complaint of abnormal loudness growth curve

Answer 20

increased sensitivity to sound things are to loud

Question 21

non linear signal proccesing is also called

Answer 21

automatic gain control AGC

Question 22

what is frequency resolution

Answer 22

auditory systems ability to detect
discrete frequencies in the cochlea

Question 23

frequency resolution:
the acoustic signal creates

Answer 23

a sharp peak on the basilar membrane at point equal to input frequency

Question 24

sharp peak in frequency resolution provides

Answer 24

speech intellgibilty

Question 25

When frequency resolution is decreased, the primary signal is no longer enhanced

Answer 25

making it difficult to differentiate the desired signal (speech) from the undesired signal (noise) brain cant untangle

Question 26

temporal resolution

Answer 26

ability of cochlea to detect small time related changes

Question 27

good auditory temporal resolution

Answer 27

helps with understanding speech in noise

Question 28

time related cues

Answer 28

gap detection phonemic duration temporal ordering suprasegmentals

Question 29

Interaural timing differences

Answer 29

low frequency cues <850hz differences in arrival time because our ears are physically separated

Question 30

interaural level differences

Answer 30

high frequency signals <3khz ear to ear head shadow level differences

Question 31

ILD - reduction in sound level for HF because

Answer 31

head casts a shadow affect for far ear

Question 32

ILD is best for high frequency sounds bc

Answer 32

lows are not attenuated by head

Question 33

binaural loudness summation

Answer 33

hear better with two ears over one +3 db at threshold +6 at 50 dB +9 at 90 dB

Question 34

binaural loudness summation results? Practically?

Answer 34

Patient perceive better loudness w/ 2 devices - not as much gain needed @ threshold 2-3dB @supra threshold 6-8

Question 35

binaural squelch

Answer 35

improved intellgibilty in noise to focus in on signal binaural hearing offers 2-3dB SNR

Question 36

binaural interferance

Answer 36

atrophy of corpus callosum redcues speech intellgibitly in noise with bi lateral input

Question 37

solution of binaural interferance ?

Answer 37

remove one hearing aid when in noise dichotic test

Question 38

pinna effect

Answer 38

increase output w/ microphone and decrease wind noise

Question 39

pinna effect part 2

Answer 39

pinna adds natural gain and spatial awareness

Question 40

pinna boost boost intensity of HF signals by

Answer 40

7 db in 3k region

Question 41

the pinnas resonant cavities may

Answer 41

attenuate low frequency signals and boost high

Question 42

pinna effect: the deeper the microphone in the ear canal

Answer 42

better effect

Question 43

sound bore proximity to the tympanic membrane

Answer 43

increases device output

Question 44

when the volume reduces between TM and receiever

Answer 44

output increase by 6dB

Question 45

deep microphone placement and deeply fit devices

Answer 45

increase by 13 dB

Question 46

IP66

Answer 46

protection againt solids and liquids dust light/powerful water jets

Question 47

venting

Answer 47

release of amplifed low fequency 1.5khz or below

Question 48

venting reduces allows allows

Answer 48

occlusion effect unamplified sounds travel to eardrum aeration of canal or pressure release

Question 49

vent is a column of air surrounded by tube has acosutic mass inside HF signals (principles/physics)

Answer 49

HF signals dont have intertia to over come acosutic mass inside vent Lf have energy to overcome mass

Question 50

occlusion effect reported when

Answer 50

LF threshold loss is better than 50 dB hallow like talkign in barel

Question 51

occlusion effect management methods

Answer 51

reduction of OE 1)vent size 2) stabilize device in bony canal

Question 52

venting allows LF environemtn signals to

Answer 52

travel directly to the ear drum w/o amplification

Question 53

direct signal

Answer 53

allows patietns to hear LF signals and environemt sounds naturally when LF thresholds better than 40 dB

Question 54

Direct sound refers to unamplified signal arriving to the TM 1) 2) 3)

Answer 54

1. If the amplified signal is 20 dB SPL louder than the natural “direct” signal audibility of the amplified signal dominates 2. If the amplified signal is an equal intensity to the natural “direct signal” the two signals combine and are perceived as one auditory signal arriving to the TM 3. If the intensity of the “direct signal” is substantially louder than the amplified signal, the direct signal will mask the amplified signal

Question 55

The final output and frequency response arriving to the TM may be unexpectedly altered when the direct signal moving inward is in-phase or out-of-phase with the amplified sound moving outward inphase= outphase =

Answer 55

double or cancel output signal STANDING WAVES!!!!!

Question 56

vent styles

Answer 56

parallel vents angle vents half/external trench vent

Question 57

angle vent decreases can also cause

Answer 57

high frequency output feedback