Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

Amplification 1 > Amplification Final > Flashcards

Amplification Final Flashcards

1
Q

Current Procedural Technology

A

codes for diagnostic procedures

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

healthcare common procedure coding system

A

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

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

ICD-10

A

classifying diagnosis or symptoms

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

high viscosity

A

thick
provides aperture stretch
condensation cured silicone

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

viscoity

A

how easily material flows

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

medium visocity

A

provides some stretch of aperture
addition cured silcone

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

low viscoity

A

runny loose
not change anatomy of ear
deep devices
addition cured

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

addition cured silcone

A

provides 1:1 parts polyvinyl siloxane

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

condensation cured silicone

A

dimethyl silxoane
paste and hardener

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

methyl methacrylate

A

powder and liquid

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

stress relaxation

A

material ability to return to shape after removal

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

contraction ration

A

shrinkage over 7 day period
sillicone shirnks
methyl methacryalate shirnks

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

shore value

A

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

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

open jaw impression

A

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

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

single impression

A

place horizontally on side of impression

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

bi lateral impression

A

place vertically

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

35% of speech intellgibilty comes from

A

2 khz

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

3khz and higher adds how much speech intellgibilty ?

A

25%

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

95% of speech intelggbilty comes from frequencies

A

5oo to 5khz

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

complaint of abnormal loudness growth curve

A

increased sensitivity to sound things are to loud

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
21
Q

non linear signal proccesing is also called

A

automatic gain control AGC

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
22
Q

what is frequency resolution

A

auditory systems ability to detect
discrete frequencies in the cochlea

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
23
Q

frequency resolution:
the acoustic signal creates

A

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

24
Q

sharp peak in frequency resolution provides

A

speech intellgibilty

25
Q

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

A

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

brain cant untangle

26
Q

temporal resolution

A

ability of cochlea to detect small time related changes

27
Q

good auditory temporal resolution

A

helps with understanding speech in noise

28
Q

time related cues

A

gap detection
phonemic duration
temporal ordering
suprasegmentals

29
Q

Interaural timing differences

A

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

30
Q

interaural level differences

A

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

31
Q

ILD - reduction in sound level for HF because

A

head casts a shadow affect for far ear

32
Q

ILD is best for high frequency sounds bc

A

lows are not attenuated by head

33
Q

binaural loudness summation

A

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

34
Q

binaural loudness summation
results?
Practically?

A

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

35
Q

binaural squelch

A

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

36
Q

binaural interferance

A

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

37
Q

solution of binaural interferance ?

A

remove one hearing aid when in noise
dichotic test

38
Q

pinna effect

A

increase output w/ microphone and decrease wind noise

39
Q

pinna effect part 2

A

pinna adds natural gain and spatial awareness

40
Q

pinna boost boost intensity of HF signals by

A

7 db in 3k region

41
Q

the pinnas resonant cavities may

A

attenuate low frequency signals and boost high

42
Q

pinna effect: the deeper the microphone in the ear canal

A

better effect

43
Q

sound bore proximity to the tympanic membrane

A

increases device output

44
Q

when the volume reduces between TM and receiever

A

output increase by 6dB

45
Q

deep microphone placement and deeply fit devices

A

increase by 13 dB

46
Q

IP66

A

protection againt solids and liquids
dust light/powerful water jets

47
Q

venting

A

release of amplifed low fequency 1.5khz or below

48
Q

venting
reduces
allows
allows

A

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

49
Q

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

A

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

Lf have energy to overcome mass

50
Q

occlusion effect reported when

A

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

51
Q

occlusion effect management methods

A

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

52
Q

venting allows LF environemtn signals to

A

travel directly to the ear drum w/o amplification

53
Q

direct signal

A

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

54
Q

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

A
  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
55
Q

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 =

A

double or cancel output signal

STANDING WAVES!!!!!

56
Q

vent styles

A

parallel vents
angle vents
half/external trench vent

57
Q

angle vent decreases can also cause

A

high frequency output
feedback

Amplification 1 (2 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions