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Hearing Aid Dispenser Exam Questions and
Correct Answers the Latest Update and
Recommended Version
Frequency
✓ - How many times per second a sound wave alternates pressure
✓ - Measured in Hz or kHz
Period
✓ - Time taken for a repetitive sound wave to finish one cycle.
✓ - = 1/f
Phase
✓ - Describes the timing of a sound
Two waves are out of phase when...
✓ there waveforms are proportional, but all frequencies have a 180 degrees phase shift
(opposite polarity).
Wavelength
✓ The distance a sound wave travels in one period.
Sound Pressure Level
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✓ - Number of dB by which any sound pressure exceeds the reference (2x10^-5 pa).
When pressure doubles, how much is added?
✓ 6 dB
When pressure increases 10 times, the SPL increases by...
✓ 20 dB
An octave is...
✓ a doubling of frequency
Fourier Analysis
✓ A mathematical procedure by which any signal can be separated into component sine
waves at different frequencies. Combining these sine waves will reproduce the original
signal.
Gain is calculated by...
✓ Output level minus input level
Is compression linear or non-linear
✓ Non-linear
Name the essential parts of a HA
|
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✓ - One or more mics to convert sound into an electrical signal
✓ - An amplifier to increase the strength of the electrical signal
✓ - A mini loudspeaker (receiver) to turn the electricity back to sound
✓ - Means of coupling the sound source to the ear canal.
✓ - A battery
How do directional microphones work?
✓ - Suppress noise coming from on mic/port while retaining good sensitivity to the sound
coming from another direction.
Name some sensitivity pattern of a HA with directional mics enabled
✓ Cardioid (has a heart shaped pattern), super cardiod, hyper cardiod, figure 8
Why is distortion bad?
✓ Degrades intelligibility
What are distortion products?
✓ - Areas that have been peak clipped from the original sound signal.
Total Harmonic Distortion (THD)
✓ - Measurement of the harmonic distortion present; Defined as the ratio of the sum of the
powers of all harmonic components to the power of the fundamental frequency.
What is a negative result of peak clipping?
|
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Hearing Aid Dispenser Exam Questions and
Correct Answers the Latest Update and
Recommended Version
Frequency
✓ - How many times per second a sound wave alternates pressure
✓ - Measured in Hz or kHz
Period
✓ - Time taken for a repetitive sound wave to finish one cycle.
✓ - = 1/f
Phase
✓ - Describes the timing of a sound
Two waves are out of phase when...
✓ there waveforms are proportional, but all frequencies have a 180 degrees phase shift
(opposite polarity).
Wavelength
✓ The distance a sound wave travels in one period.
Sound Pressure Level
|
✓ Thank You for Choosing Us! ✓ Resources & Updates: [Testtrackers - Stuvia US]
✓ © 2024 TestTrackers ✓ Your Success is Our Mission!
✓ Customer Support: [+254707240657]
, TestTrackers: Unlock Your Exam Potential! | Quality Practice Materials | Boost Your Confidence Today!
✓ - Number of dB by which any sound pressure exceeds the reference (2x10^-5 pa).
When pressure doubles, how much is added?
✓ 6 dB
When pressure increases 10 times, the SPL increases by...
✓ 20 dB
An octave is...
✓ a doubling of frequency
Fourier Analysis
✓ A mathematical procedure by which any signal can be separated into component sine
waves at different frequencies. Combining these sine waves will reproduce the original
signal.
Gain is calculated by...
✓ Output level minus input level
Is compression linear or non-linear
✓ Non-linear
Name the essential parts of a HA
|
✓ Thank You for Choosing Us! ✓ Resources & Updates: [Testtrackers - Stuvia US]
✓ © 2024 TestTrackers ✓ Your Success is Our Mission!
✓ Customer Support: [+254707240657]
, TestTrackers: Unlock Your Exam Potential! | Quality Practice Materials | Boost Your Confidence Today!
✓ - One or more mics to convert sound into an electrical signal
✓ - An amplifier to increase the strength of the electrical signal
✓ - A mini loudspeaker (receiver) to turn the electricity back to sound
✓ - Means of coupling the sound source to the ear canal.
✓ - A battery
How do directional microphones work?
✓ - Suppress noise coming from on mic/port while retaining good sensitivity to the sound
coming from another direction.
Name some sensitivity pattern of a HA with directional mics enabled
✓ Cardioid (has a heart shaped pattern), super cardiod, hyper cardiod, figure 8
Why is distortion bad?
✓ Degrades intelligibility
What are distortion products?
✓ - Areas that have been peak clipped from the original sound signal.
Total Harmonic Distortion (THD)
✓ - Measurement of the harmonic distortion present; Defined as the ratio of the sum of the
powers of all harmonic components to the power of the fundamental frequency.
What is a negative result of peak clipping?
|
✓ Thank You for Choosing Us! ✓ Resources & Updates: [Testtrackers - Stuvia US]
✓ © 2024 TestTrackers ✓ Your Success is Our Mission!
✓ Customer Support: [+254707240657]
