Part 4.2 Flashcards
A tone control generally acts as a:
a) Low pass filter
b) Output control
c) Volume control
d) High-pass filter
e) Attenuator
d) High-pass filter
The amount in (dB) the amplifier SPL exceeds the microphone SPL is:
a) Acoustic output
b) Saturation
c) Overload
d) Distortion
e) Acoustic gain
e) Acoustic gain
This is a measurement difference between what went in and what came out of the hearing aid. Look up terms.
The sum (dB) of input plus gain is:
a) Acoustic output
b) dB gain
c) S/N ratio
d) SSPL/OSPL
e) Distortion
a) Acoustic output
This is a measurement of what the hearing aid is producing.
Peak output is:
a) Average SPL of 500, 1000 and 2000 Hz
b) Expressed in dB HTL
c) Always read indirectly
d) The point of maximum amplification
e) The point of maximum SSPL/OSPL
e) The point of maximum SSPL/OSPL
Frequency range is expressed as:
a) 15 dB up from the average of 500, 1000 and 2000 Hz
b) 20 dB down from the average of 1000, 1600 and 2500 Hz
c) The range from 0 dB amplification in the lows to 0 dB in the highs
d) Is expressed as the number of cycles between the extremes
e) range crossing a line across frequency response at 15 dB
b 20 dB down from the average of 1000, 1600 and 2500 Hz
Straight memorization.
The representation which shows the performance of an aid at various input levels is the:
a) Volume and control taper
b) Distortion curve
c) Comprehensive frequency response (family of curves)
d) Basic frequency curve
e) Frequency range
c) Comprehensive frequency response (family of curves)
Curve refers to a measurement more than a range. Family relates to more than one.
The relationship of peak gain to HF average gain is:
a) HF average gain is less
b) They are both the same
c) HF average gain is more
d) HF average gain is always 15 dB less
e) Not enough information
a) HF average gain is less
A peak is always going to be more than an average.
The input usually used to record the response curve of a hearing aid is:
a) 50 dB
b) 60 dB
c) 80 dB
d) 90 dB
e) None of the above
b) 60 dB
Straight memorization.
Hearing gain is expressed as:
a) dB
b) dB SPL
c) dB HTL
d) dB SL
e) dB IL
a) dB
Sound is measured by decibels
The type 2-cc coupler used most frequently to measure ITE hearing aids is:
a) HA - 1
b) HA - 2
c) HA - 3
d) HA - C2
e) Zwislocki
a) HA - 1
Straight memorization.
An integrated receiver used in hearing aids is the:
a) Class D
b) Electret
c) Magnetic
d) Directional
e) FET (field effect transistor)
a) Class D
Straight memorization.
The name associated with the reduced VC setting at which to measure THD is:
a) HF average gain
b) EIN
c) Special purpose average gain
d) Reference test gain position
e) ASP kneepoint
d) Reference test gain position
To measure something is to test it.
One of the following statements about microphones is false:
a) Most microphones are relatively inefficient
b) Converts acoustic signal to electrical signal
c) Referred to as an input transducer
d) Are rated according to frequency response, impedance and sensitivity
e) Acoustic signal impinges on microphone diaphragm
a) Most microphones are relatively inefficient
The sound pressure level associated with 0 dB HTL on the audiometer:
a) Varies from audiometer to audiometer (if all are in calibration)
b) Varies as a function of frequency
c) Is equal to 0.0002 dynes/cm2
d) Is the same for all frequencies
e) Is the same for speech as it is for pure tones
b) Varies as a function of frequency
Change the frequency and you change the sound pressure level.
ANSI calibrated speech audiometer 0 dB under headphones is equivalent to approximately:
a) 20 dB SPL
b) 10 dB SPL
c) 30 dB SPL
d) 0 dB SPL
e) 0 dB HTL
a) 20 dB SPL
