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Amplification 1 > Practical Questions > Flashcards

Practical Questions Flashcards

Amplification practical

1
Q

American National Standards Institute

A
  • specifies electrical equipment standards
  • specifies human related standards, and defines test protocols and normative data
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2
Q

Spec Sheet

A

compare in office performance to a set of measurement standards

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3
Q

acoustic chamber designed

A

to reduce reflections

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4
Q

Low ambient room noise

A

ambient noise cant affect results more than 0.5 dB

Test signal 10 dB louder than ambient noise

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5
Q

calibrated sound source consists of

A

testbox speakers and reference microphone

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6
Q

measurement microphone collects

A

signals exiting the device

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7
Q

reference microphone calibrates the

A

SPL output from speakers
- monitors signal intensity and automatically adjust speaker volume to maintain proper intensity

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8
Q

coupler microphone is a

A

measurement microphone sealed into the coupler that collects the output data from the hearing aid

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9
Q

Which coupler do we use

A

HA-2 Coupler

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10
Q

ANSI Standard pre measurement set up, devices must be adjusted what kind of settings?

A

Test mode settings

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11
Q

Testmode settings: settings in device must be set to provide the highest possible output

A
  • internal gain settings maximized
  • volume control maximized
  • compression minimized to 1:1 (linear)
  • set to broadcast frequency response
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12
Q

ANSI standard requires what measurements?

A

OSPL 90
Full on gain @ 50 dB
Reference test gain @ 60 dB
Total Harmonic Distortion
Equivalent Input noise

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13
Q

OSPL 90 - output SPL @ 90 dB

A

identifies the loudest possible output point the device can produce for a 90 dB input signal
- represents single frequency
GREEN PEAK LINE

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14
Q

HFA OSPL 90 - high frequency average output SPL @ 90dB

A

Calculates the average OSPL @ 90 output for 1K, 1.6K, 2.5k HZ

3 green triangles at bottom of screen

(maximum output of HA wont exceed UCL)

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15
Q

HFA/FOG
High Frequency Average full on gain

A

shows average gain for 1,1.6, and 2.5 kHZ for a 50 dB SPL Input signal

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16
Q

Reference Test Gain (reduce volume after HFA FOG)

A

output 17dB below HFA FOG @ 50 values
60 dB input signal measures the response

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17
Q

Equivalent Input noise

A

measure the internal noise of the HA
- subtracting HFA FOG 50 from output measured when NO signal is being delivered to the aid

typically 25-30 dB SPL

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18
Q

Total Harmonic Distortion

measurement of signal distortion

A

determines if the output signal contains harmonic frequencies that were not present in the input signal

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19
Q

Total Harmonic Distortion

last 3 % below EIN

A

70 dB SPL @ 500 and 800
65 dB SPL @ 1600 HZ

20
Q

% Total Harmonic Distortion should be below ?

A

5-10%
high distortion levels good indication device is failing sent it in for repair!

21
Q

Induction coil/telecoil measurements

A

compares telecoil output to microphones reference test gain output

(ensure output from these two transducers is the same)

22
Q

induction coil/telecoil measurements identify if

A

telecoils sensitivity provides greater output in the horizontal or vertical position

23
Q

Telecoil Magnetic Field Simulator (TEST)

A

electromagnetic signal emitted from (T)

24
Q

what is SPLITS

A

sound pressure level for an inductive simulator

output measurement of TMFS signal

25
Q

SPLITS shows

A

TCOIL output

26
Q

RSETS?

A

relative simulated equivalent telephone sensitivity

27
Q

RSETS if difference between

A

SPLITS output and microphone output

28
Q

a positive RSETS indicates ?

A

telecoil output is louder than the microphone output

29
Q

What will user do to HA if + RSETS

A

lower the HA volume when telecoil is activated

30
Q

a neagtive RSETS indicates?

A

telecoil output is softer than the microphone output

31
Q

What will user need to do to HA if (-) RSETS

A

raise the HA volume when telecoil is activated

32
Q

SPLIV

A

output compared to microphone in vertical position
LOOPED

33
Q

VENT:
@ 500 HZ
50-60dB loss

A

.5 to no vent

34
Q

VENT:
@ 500 HZ
40-49 dB loss

A

1-2mm

35
Q

VENT:
@ 500 Hz
30-39

A

2-3mm or power dome

36
Q

VENT:
@ 500 Hz
20-29 dB loss

A

3-3.5 mm or closed dome

37
Q

VENT:
<20 db to 1.5k HZ

A

open dome

38
Q

Tubing:
a change to the internal dimeter will change?

A

the device output and frequency response

39
Q

Tubing:
#12

A

thicker and bigger opening

40
Q

Tubing
#13

A

Smaller opening

41
Q

Tubing= smaller diameter of inner tube =

A

attenuation of HF signals

42
Q

Tubing = thick wall tube is used to reduce

A

vibration
reduces feedback

43
Q

open dome coupler

A

appropriate for HF loss
- normal hearing til 1500 Hz

<20 dB to 1.5khz

44
Q

closed or tulip dome

A

some mid frequency amplification
hearing thresholds better than 40 dB HL below 1khz

20-29 dB loss @ 500

45
Q

power(double) dome coupler

A

provides some amplification to mid and low frequencies
- hearing thresholds better than 40 dB below 1 khz

30-39 dB loss at 500

Amplification 1 (2 decks)

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