Part 3.2 Flashcards
The condition in which the intensity of the sound is reduced because of the head positioned between the ears is:
a) Masking
b) Attentuation
c) Head shadow effect
d) Directional hearing
e) Summation
c) Head shadow effect
The name of the effect gives clue to the function here.
Directional microphones depend on which feature(s) to create their effect:
a) Increases desired signals
b) Intensity and time of arrival differences
c) Phase differences
d) Intensity differences
e) Amplitude differences
b) Intensity and time of arrival differences
They locate by triangulation. There must be differences for them to triangulate.
One of the following statements about directional microphones hearing aids is not true:
a) Most signal amplification is from the front
b) S/N ratio is improved because of the noise suppression from the back
c) Front-back localization occurs
d) Discrimination is improved in quiet
e) Increased effective hearing directly in front
d) Discrimination is improved in quiet
Visualize each of the answers. Quiet makes no sense, you need sounds to discriminate.
When a 45 degree line indicates a constant gain to the saturation of a hearing aid it is called:
a) Curvilinear amplification
b) Logarithmic amplification
c) Non-linear amplification
d) Peak limiting amplification
e) Linear amplification
e) Linear amplification
They are talking about an analog hearing aid here. There are no curves, peaks, or anything discriminating in the audiogram of an analog hearing aid.
The maximum SPL the hearing aid can produce with a given gain, regardless of input is:
a) dB output
b) Acoustic gain
c) S/N ratio
d) SSPL/OSPL
e) Distortion
d) SSPL/OSPL
SPL question leads to SPL answer. Find out what the O and S at the beginning of the SPL mean.
High frequency average gain is obtained by averaging the frequencies of _____ Hz:
a) 1000, 2000 and 4000
b) 100, 200 and 300
c) 500 and 1000
d) 500, 1000, 2000
e) 1000, 1600, 2500
e) 1000, 1600, 2500
Straight memorization. This covers the main spectrum of sound that a human hears in.
The HFA gain of a hearing aid with gain values of 20, 40 and 50 dB at 1000, 1600 and 2500 Hz respectively is:
a) 40 dB
b) Almost 37 dB
c) 110 dB
d) 45 dB
e) Too much information
b) Almost 37 dB
Use straight mathematics to average the numbers.
The best type of amplitude output limiting is:
a) Peak clipping
b) AGC
c) Compression amplification
d) ASP
e) None sufficiently demonstrates to have overall advantage
e) None sufficiently demonstrates to have overall advantage
People respond differently, so none has an advantage
The performance of the capacitor in a hearing aid is to:
a) Pass the highs and to pass the lows
b) Block both highs and lows
c) Act as a resistor to cut the SSPL 90
d) Pass the highs and block the lows
e) Pass mid frequencies only
d) Pass the highs and block the lows
The directional microphone differs from the conventional omni-directional microphone in which way:
a) It allows for a time of arrival (phase) difference
b) It allows for an intensity difference between the signal F/B openings
c) It has two openings for a microphone instead of one
d) It passes signals from the front with greatest efficiency
e) All of the above
e) All of the above
The measurement which provides information about the OSPL to which the aid should be limited for a given individual is the:
a) TD (Threshold of Discomfort)
b) MCL
c) SPL 90
d) SRT
e) DR
a( TD (Threshold of Discomfort)
Maximum of the hearing aid related to the maximum a person wishes to hear.
Dynamic Range is:
a) The level of maximum discomfort
b) The MPO of the hearing aid
c) The volume control range of the hearing aid
d) TD - SRT
e) SRT - MCL
d) TD - SRT
If the MCL is only slightly above the SRT, this may indicate:
a) Loudness discomfort problems should be anticipated
b) Considerable gain can be realized
c) It will be difficult to get enough gain from the aid to make speech audible:
d) MPO can be high
e) A large dynamic range
a) Loudness discomfort problems should be anticipated
Not much room for the person to hear. He turns it up slightly, and it becomes too loud.
The term that best describes the binaural word recognition score is _____ ?
a) Binaural localization
b) Binaural squelch
c) Binaural degradation
d) The head shadow effect
c) Binaural degradation
