HEARING AID REVISION EXAMS 2025/2026 QUESTIONS
WITH ANSWERS RATED A+
✔✔Occlusion Management - ✔✔Enforce reduced gain
Modify low-frequency compression ratios
Due to own voice
✔✔Active Noise Control to Reduce Occlusion - ✔✔-Measure sound pressure in the
canal
-Generate an out-of-phase sound to cancel it
-Feedback control system
✔✔When is dynamic range compression appropriate? - ✔✔Milder compression
desirable for music; not normally good for music because you lose the sounds
✔✔When is directional microphone appropriate? - ✔✔wind noise can interfere, can hear
instrument noise in quiet room
✔✔Noise Reduction - ✔✔Cause artifacts for music; noisier environment require more
aggressive algorithm
✔✔Feedback canceller - ✔✔Creates artifacts for music and tones
✔✔Environment classification - ✔✔No directional mic outside; need noise reduction in
noisy room; milder compression for music; less noise reduction in quiet
✔✔Synchronization of left/right ear functions - ✔✔Volume control
Memory select
Environment classification
✔✔Binaural algorithms - ✔✔Two-ear beamforming
Binaural noise reduction
✔✔Coupler Gain - ✔✔Frequency specific difference between the HA output in 2cc
coupler and the input
✔✔Orthotelephonic Gain - ✔✔Sound difference between face-to-face and telephone
✔✔Insertion Gain - ✔✔Open ear response subtracted from the aided response; used to
verify methods like NAL-R
✔✔In Situ - ✔✔The "real time" response-used to verify DSL
, ✔✔Etymotic Gain - ✔✔Same as insertion gain; better known as the company name for
Mead Killion
✔✔Functional Gain - ✔✔Aided thresholds subtracted from unaided thresholds
✔✔Compression kneepoint - ✔✔Lowest level at which compression is activated
✔✔Compression ratio - ✔✔Change of output to change of input over a specific region
✔✔Linear Compression - ✔✔Consistent (but not equal) changes in output
✔✔Curvilinear Compression - ✔✔after the knee point, compression ratio becomes
larger
✔✔Compression limiting - ✔✔High knee point and CR, limits the output
✔✔High Level Compression - ✔✔Used to accomplish compression limiting
✔✔Dynamic Range Compressioning - ✔✔Compression that utilizes a knee point low
enough (<65dB SPL) so that at least a portion of eh dynamic range of speech is in
compression
✔✔Wide Dynamic Range Compression - ✔✔Similar to DRC except that compression
occurs over a wide range of inputs; needs low kneepoint
✔✔Whole range Syllabic Compression - ✔✔Similar to WDRC except a short release
time is suggested
✔✔Full Dynamic Range Compression - ✔✔The entire dynamic range of speech is
compressed; knee point of 45dB or lower
✔✔Automatic Gain Control - ✔✔automatic monitoring circuit that reduces gain as a
function of the level of the signal that is amplified
✔✔Automatic Volume Control - ✔✔Fitting application of AGC that utilizes long release
time
✔✔Time Constants - ✔✔Attack and release time of the compression system
✔✔Attack Time - ✔✔Time required for output to reach level specified by the
compression curve after an increase in the input above the compression threshold
✔✔Release time (recovery time) - ✔✔Time required for a circuit to respond to a
decrease int eh input and adjust to a lower compression characteristic
WITH ANSWERS RATED A+
✔✔Occlusion Management - ✔✔Enforce reduced gain
Modify low-frequency compression ratios
Due to own voice
✔✔Active Noise Control to Reduce Occlusion - ✔✔-Measure sound pressure in the
canal
-Generate an out-of-phase sound to cancel it
-Feedback control system
✔✔When is dynamic range compression appropriate? - ✔✔Milder compression
desirable for music; not normally good for music because you lose the sounds
✔✔When is directional microphone appropriate? - ✔✔wind noise can interfere, can hear
instrument noise in quiet room
✔✔Noise Reduction - ✔✔Cause artifacts for music; noisier environment require more
aggressive algorithm
✔✔Feedback canceller - ✔✔Creates artifacts for music and tones
✔✔Environment classification - ✔✔No directional mic outside; need noise reduction in
noisy room; milder compression for music; less noise reduction in quiet
✔✔Synchronization of left/right ear functions - ✔✔Volume control
Memory select
Environment classification
✔✔Binaural algorithms - ✔✔Two-ear beamforming
Binaural noise reduction
✔✔Coupler Gain - ✔✔Frequency specific difference between the HA output in 2cc
coupler and the input
✔✔Orthotelephonic Gain - ✔✔Sound difference between face-to-face and telephone
✔✔Insertion Gain - ✔✔Open ear response subtracted from the aided response; used to
verify methods like NAL-R
✔✔In Situ - ✔✔The "real time" response-used to verify DSL
, ✔✔Etymotic Gain - ✔✔Same as insertion gain; better known as the company name for
Mead Killion
✔✔Functional Gain - ✔✔Aided thresholds subtracted from unaided thresholds
✔✔Compression kneepoint - ✔✔Lowest level at which compression is activated
✔✔Compression ratio - ✔✔Change of output to change of input over a specific region
✔✔Linear Compression - ✔✔Consistent (but not equal) changes in output
✔✔Curvilinear Compression - ✔✔after the knee point, compression ratio becomes
larger
✔✔Compression limiting - ✔✔High knee point and CR, limits the output
✔✔High Level Compression - ✔✔Used to accomplish compression limiting
✔✔Dynamic Range Compressioning - ✔✔Compression that utilizes a knee point low
enough (<65dB SPL) so that at least a portion of eh dynamic range of speech is in
compression
✔✔Wide Dynamic Range Compression - ✔✔Similar to DRC except that compression
occurs over a wide range of inputs; needs low kneepoint
✔✔Whole range Syllabic Compression - ✔✔Similar to WDRC except a short release
time is suggested
✔✔Full Dynamic Range Compression - ✔✔The entire dynamic range of speech is
compressed; knee point of 45dB or lower
✔✔Automatic Gain Control - ✔✔automatic monitoring circuit that reduces gain as a
function of the level of the signal that is amplified
✔✔Automatic Volume Control - ✔✔Fitting application of AGC that utilizes long release
time
✔✔Time Constants - ✔✔Attack and release time of the compression system
✔✔Attack Time - ✔✔Time required for output to reach level specified by the
compression curve after an increase in the input above the compression threshold
✔✔Release time (recovery time) - ✔✔Time required for a circuit to respond to a
decrease int eh input and adjust to a lower compression characteristic
