ILE EXAMPREP SCRIPT QUESTIONS AND
VERIFIED SOLUTIONS SET
●● What does increasing the compression ratio do, and when would you
use this?
Answer: Soft sound gain is unaltered, but gain for moderate/loud sounds
is lowered. Most often used if a PT complains loud/moderate sounds are
too loud or background noise is too loud. ** sometimes you use this on
just certain frequencies, for example, high frequencies if they complain
dishes are too loud, or low frequencies if they complain their voice is
echo-y
●● What happens when you raise a knee point, and when would you do
this?
Answer: You will decrease gain for soft sounds and raise gain for
moderate/loud sounds. Most often used if they hear soft sounds better
than moderate ones ( like hearing the table across from them better than
their own in a restaurant) or when they complain about hearing a HA's
circuit noise.
●● What does lowering the kneepoint do, and when would you do this?
Answer: Lowering the KP will lower gain for moderate and loud sounds,
and increase gain for soft sounds below the original KP. Mostly used
when a PT complains they can't hear soft sounds like soft voices, bird
chirping, or ticking clocks.
,●● What are the two types of compression?
Answer: Input compression - when the input level of a HA determines
when compression is activated.
Output compression - when the output (input + gain) of the HA
determines when compression is activated.
●● What is Wide Dynamic Range Compression?
Answer: (WDRC) This is what most HA's utilize today, and allows the
signal to be packaged withing a user's DR. Typically WDRC HA's have
low (35-55 dB SPL) KPs and low (1:1 - 1:4) ratios
●● What is the Compression Ratio?
Answer: The ratio of change between the input and output of a HA. This
determines how much compression will occur.
●● What is the Kneepoint? (KP)
Answer: The lowest level at which compression is applied
●● What is Harmonic Distortion?
Answer: Harmonic distortion occurs when a single frequency is
presented to the input of a hearing aid and the output contains the
original frequency plus additional undesired frequencies that are
harmonically related to the original frequency.
,ANSI uses a harmonic distortion test that measures the distortion rate at
specific Hz.
●● Frequency Response Curve
Answer: Used in ANSI testing. A gain curve is run with the input sound
at 60 dB SPL to simulate conversation level. You get the frequency
range calculation from this test.
●● Reference Test Gain (RTG)
Answer: Used in ANSI testing. Input sound is set at 60 dB SPL to
simulate conversation level; and then the HFA gain is adjusted to HFA-
OSPL90 -77 dB. The answer is the RTG.
●● Full On Gain (FOG)?
Answer: Used in ANSI testing. The HFA-FOG is measured and recorded
w/ the input set at 50 dB SPL
●● Maximum Output Curve ( OSPL90)
Answer: Used in ANSI testing. It's the max output of a HA. Input is set
to 90 dB SPL to test. Notes the max at each tested frequency. HFA is
noted from this test.
●● What must be done to an aid before ANSI testing?
Answer: 1- Occlude all vents on outside of aid
, 2- Set to test mode with gain full on, output at max, and bandwidth to
max
3-Telecoil should be turned off and only turned back on when testing
SPLITS
●● What couplers do do you use with what instruments when ANSI
testing?
Answer: HA-1 = ITE
SB-1 = RIC and thin tube BTE's
HA-2 = BTE
●● What is a coupler?
Answer: A joiner for a HA that is designed off the vol of an average ear
(2cc). Used to connect the HA to a testing box for ANSI tests.
●● What is Adaptive Feedback Supression?
Answer: This allows a HA to detect and minimize feedback on it's own.
** There is also static feedback supression.
●● What is Digital Noise Reduction (DNR)?
Answer: This is an algorithm which allows a HA to seperate desired
signals ( like speech) from undesired ones ( like noise)
VERIFIED SOLUTIONS SET
●● What does increasing the compression ratio do, and when would you
use this?
Answer: Soft sound gain is unaltered, but gain for moderate/loud sounds
is lowered. Most often used if a PT complains loud/moderate sounds are
too loud or background noise is too loud. ** sometimes you use this on
just certain frequencies, for example, high frequencies if they complain
dishes are too loud, or low frequencies if they complain their voice is
echo-y
●● What happens when you raise a knee point, and when would you do
this?
Answer: You will decrease gain for soft sounds and raise gain for
moderate/loud sounds. Most often used if they hear soft sounds better
than moderate ones ( like hearing the table across from them better than
their own in a restaurant) or when they complain about hearing a HA's
circuit noise.
●● What does lowering the kneepoint do, and when would you do this?
Answer: Lowering the KP will lower gain for moderate and loud sounds,
and increase gain for soft sounds below the original KP. Mostly used
when a PT complains they can't hear soft sounds like soft voices, bird
chirping, or ticking clocks.
,●● What are the two types of compression?
Answer: Input compression - when the input level of a HA determines
when compression is activated.
Output compression - when the output (input + gain) of the HA
determines when compression is activated.
●● What is Wide Dynamic Range Compression?
Answer: (WDRC) This is what most HA's utilize today, and allows the
signal to be packaged withing a user's DR. Typically WDRC HA's have
low (35-55 dB SPL) KPs and low (1:1 - 1:4) ratios
●● What is the Compression Ratio?
Answer: The ratio of change between the input and output of a HA. This
determines how much compression will occur.
●● What is the Kneepoint? (KP)
Answer: The lowest level at which compression is applied
●● What is Harmonic Distortion?
Answer: Harmonic distortion occurs when a single frequency is
presented to the input of a hearing aid and the output contains the
original frequency plus additional undesired frequencies that are
harmonically related to the original frequency.
,ANSI uses a harmonic distortion test that measures the distortion rate at
specific Hz.
●● Frequency Response Curve
Answer: Used in ANSI testing. A gain curve is run with the input sound
at 60 dB SPL to simulate conversation level. You get the frequency
range calculation from this test.
●● Reference Test Gain (RTG)
Answer: Used in ANSI testing. Input sound is set at 60 dB SPL to
simulate conversation level; and then the HFA gain is adjusted to HFA-
OSPL90 -77 dB. The answer is the RTG.
●● Full On Gain (FOG)?
Answer: Used in ANSI testing. The HFA-FOG is measured and recorded
w/ the input set at 50 dB SPL
●● Maximum Output Curve ( OSPL90)
Answer: Used in ANSI testing. It's the max output of a HA. Input is set
to 90 dB SPL to test. Notes the max at each tested frequency. HFA is
noted from this test.
●● What must be done to an aid before ANSI testing?
Answer: 1- Occlude all vents on outside of aid
, 2- Set to test mode with gain full on, output at max, and bandwidth to
max
3-Telecoil should be turned off and only turned back on when testing
SPLITS
●● What couplers do do you use with what instruments when ANSI
testing?
Answer: HA-1 = ITE
SB-1 = RIC and thin tube BTE's
HA-2 = BTE
●● What is a coupler?
Answer: A joiner for a HA that is designed off the vol of an average ear
(2cc). Used to connect the HA to a testing box for ANSI tests.
●● What is Adaptive Feedback Supression?
Answer: This allows a HA to detect and minimize feedback on it's own.
** There is also static feedback supression.
●● What is Digital Noise Reduction (DNR)?
Answer: This is an algorithm which allows a HA to seperate desired
signals ( like speech) from undesired ones ( like noise)
