Part 4.6 Flashcards
The telecoil
a) utilizes a magnetic induction pickup
b) uses electromagnetic leakage
c) is used as one method of coupling assistive listening devices to hearing aids
d) all of the above
d) all of the above
Consider how a telephone works. Remember, if two are true then all are true.
A phoneme is composed of several frequencies of varying intensities
True
False
True
Any complex sound can be broken down into individual frequencies by a technique known as Fourier Spectral Analysis.
True
False
True
The organ of Corti
a) is located in the scala media
b) is located in the scala tympani
c) is located in the scala vestibuli
d) is located in the middle ear
e) is located in the Eustachian tube
a) is located in the scala media
In bone conduction testing, because there is no headphone over the test ear
a) the room noise may affect the results
b) the test tone will be picked up more quickly in the ear
c) the test tone may crossover to the non-test ear at a lesser intensity
d) all of the above
a) the room noise may affect the results
Think about what is being asked. This is the only one that makes sense.
The electrical signal generated at the microphone is coupled to the amplifier which increases its
a) frequency range
b) voltage
c) wattage
d) none of the above
d) none of the above
None of these make sense. What does a hearing aid amplify?
The scala tympani is filled with
a) hair cells
b) cerumen
c) the tectorial membrane
d) endolymph!
e) perilymph
e) perilymph
The reference level for ‘zero’ dB on the speech audiometer is
a) 45 dB re: 0.0002 dynes/cm(sq) for a 1000 Hz tone
b) 40 dB re: 0.0002 dynes/cm(sq) for a 1000 Hz tone
c) 30 dB re: 0.0002 dynes/cm(sq) for a 1000 Hz tone
d) 20 dB re: 0.0002 dynes/cm(sq) for a 1000 Hz tone
d) 20 dB re: 0.0002 dynes/cm(sq) for a 1000 Hz tone
The preferred masking noise to be used for speech audiometry is
a) narrow band noise
b) noise ‘shaped’ to resemble the speech spectrum
c) either a or b
d) none of the above
b) noise ‘shaped’ to resemble the speech spectrum
Under the mechanics of it all is a human being.
In fitting a hearing instrument one method of choosing gain is
a) equal to the SRT
b) 15 - 20 dB more than the SRT
c) 15 - 20 dB less than the SRT
d) of no importance when fitting sensorineural cases
c) 15 - 20 dB less than the SRT
Bone conduction thresholds are defined as
a) the weakest bone conduction signal detected at least 50% of the time
b) the weakest signal detected in the opposite ear
c) the weakest signal where words are understood by bone conduction
d) none of the above
a) the weakest bone conduction signal detected at least 50% of the time
The keyword is threshold
As a practical matter it should be noted that whenever the gain requirements exceed 40dB at 1000 Hz, it may be necessary to
a) flatten the indicated response curve
b) increase the response above 1000 Hz
c) increase the response below 1000 Hz
d) increase the high and low response
a) flatten the indicated response curve
More than 40 dB can be uncomfortable, given the range of hearing involved.
The exact function of the middle ear muscles is well agreed upon
True
False
True
The major parts of the inner ear are
a) vestibule, cochlea, and perilymph
b) vestibule, cochlea, and semi-circular canals
c) vestibule, cochlea, and oval window
d) vestibule, semi-circular canals, and stapes
e) vestibule, semi-circular canals, and endolymph
b) vestibule, cochlea, and semi-circular canals
The output sound pressure level produced by the hearing aid receiver is usually measured in a standardized 2 cc coupler
True
False
True
