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300 Cards in this Set
- Front
- Back
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The adult ear canal:
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rises upward and forward, and then descends to the drum
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The isthmus is:
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where the canal narrows to enter the temporal bone
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The pinna and the external canal together:
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*gather and reinforce acoustical signals
*with the irregular shape of the auricle, cause increases and decreases at different frequencies as the sound arrives at the ear *forms a resonating tube |
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The average resonant frequency of the ear canal plus concha is:
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2700 Hz
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The dividing line between the external ear and the middle ear is the:
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tympanic membrane
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The ear canal contains:
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cilia, ceruminous glands, sebaceous glands
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The Vagus Nerve (Xth Cranial) is found:
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along the bottom of the ear canal
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Which of the following terms in not part of the tympanic membrane?
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x crus
Pars tensa Pars flaccida Umbo |
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An otoscopic inspection should reveal:
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a view of the pearly white tympanic membrane
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Which of the following is a part of the pinna?
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*tragus
*intertragal notch *triangular fossa |
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Atresia refers to:
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a closure of the external auditory canal
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Perforation of the eardrum can be caused by:
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*an infection
*a fracture of the temporal bone *a nearby explosion |
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The following are types of hearing loss:
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*conductive
*central *sensorineural |
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Conductive losses may be caused by:
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*a prolapsed canal
*impacted cerumen |
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Which surgical technique repairs the tympanic membrane?
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myringoplasty
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A cholesteatoma can be described as:
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a pouch of skin filled with epithelial debris
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When an excess of cerumen or a blockage of cerumen is detected, the hearing aid specialist should:
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refer the patient to a physician
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A swollen ear may be caused by:
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*eczema
*otis externa *dermatitis |
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Tympanosclerosis may be described as:
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calcium deposits
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A tympanic membrane perforation may cause a:
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conductive loss
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Theoretically the increase in sound pressure provided by the middle ear structure is about:
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27 dB
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The footplate of the stapes fits into the:
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oval window
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A type 'A' tympanogram would indicate:
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normal pressure and compliance
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The difference in area size between the tympanic membrane and the footplate of the stapes increasing the sound pressure at the footplate is:
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the transfer function or aerial ratio
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The middle ear cavity contains:
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annular ligament, malleus, stapes, and tensor tympani
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The middle ear system is often referred to as:
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an impedance matching transformer
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The middle ear cavity, as a transducer, changes energy from one form to another. The energy change is from:
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acoustic energy to mechanical energy to hydraulic energy
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The middle ear muscles contract
resulting in: |
an acoustic reflex
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The Eustachian tube begins in the lower portion of the tympanic cavity and ends at the:
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nasopharynx
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The Eustachian tube of a child is:
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*straight
*short *horizontal |
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A cholesteatoma:
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*occurs in the middle ear
*may perforate the eardrum *is usually accompanied by a constant odorous discharge |
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Changes in either stiffness or mass occur when the normal middle ear function is altered by disease or trauma causing:
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a feeling of stuffiness or a complaint of hearing in a barrel
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Otosclerosis:
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*occurs more often in women than men
*occurs more often in Caucasians than other races *appears to be inherited |
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Most dysfunctions of the outer or middle ear cause a:
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conductive loss
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Otitis media may occur with:
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fluid in the middle ear
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A plastic or steel strut replaces the stapes during a:
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stapedectomy
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Treatment for chronic otitis media may include:
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*antibiotics
*inflation of the Eustacian tube *myringotomy |
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A radical mastiodectomy includes removal of:
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ossicular chain, mastoid
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The ossicular chain is supported and suspended by:
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stapedius, tensor tympani, ligaments
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The ear due to its physical characteristics, enhances which frequencies?
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2,000 - 5,000 Hz
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In a cross section of the cochlea, the minimum number of rows of hair cells you can see is:
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4
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The total number of neural fibers or neurons in the human auditory nerve is about:
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30,000
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The basilar membrane separates:
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the scala media and the scala tympani
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The scala tympani is filled with:
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perilymph
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The base of the cochlea;
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begins at the oval window
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The fibers of the auditory nerve at the point of maximum stimulation of the basilar membrane, discharge and recover at a rate of approximately:
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up to 1 Khz identical to the stimulus frequency
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The cochlea acting as a frequency analyzer, distributes acoustic stimuli to places along the basilar membrane according to frequency. This forms the basis of a hypothesis called the:
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place theory
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Each of the semicircular canals:
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*are oriented at 90 degrees to one another
*contain perilympth and endolympth *detect positioning and balance |
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Collections of nerve fibers are called:
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ganglia and nuclei
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Afferent fibers:
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transmit from the cochlea to the brain
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Which of the following is a result of tissue and structure damage?
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* a threshold shift
* distortion of perception of frequencies * disturbance of perception of loudness |
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A sensorineural hearing loss is due to a disorder in the:
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inner ear
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A symptom of recruitment is:
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intolerance for loud sounds
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Malingering is a category of
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non-organic loss
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Meniere's syndrome consists of:
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tinnitus, vertigo, and hearing loss
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An organic disorder is when there is damage to:
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*the hearing mechanism
*the neural pathways *the brain |
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Loudness recruitment:
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refers to abnormal loudness growth of clients with sensorineural hearing
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Tinnitus is:
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often managed by hearing instruments or tinnitus maskers
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A characteristic of a conductive loss is:
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a soft spoken patient
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Which is not a characteristic of a sensorineural loss?
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hearing better in noise than in quiet
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A dial on the audiometer to control the decibels of output is called:
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*a hearing level dial
*an attenuator dial |
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Audiometric zero for pure tones is higher than the standard reference level by about:
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differs at each frequency
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ANSI letters stand for:
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American National Standards Institute
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The audiometer is designed so that zero on the attenuator dial:
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represents the level of normal hearing for that frequency
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By air conduction sound energy changes forms in which of the following manners:
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acoustic energy, mechanical energy, hydrolic energy, electrical energy, to chemical energy
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The normal ear responds to a range of frequencies from:
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20-20,000 Hz
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Sound waves during bone conduction, transmit from the:
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skull to the cochlea
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Which of the following describes a Phon?
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A unit of measurement when comparing the loudness of one frequency to another frequency
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Routine hearing testing should be performed:
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in a sound controlled environment
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Audiometric zero is:
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*0 dB Hearing Level
*0 dB HL *the level where normal ears can hear at every frequency |
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In Pure Tone testing threshold means:
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the lowest intensity the client hears 50% of the time
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What is the meaning of 40 dB threshold re: audiometric zero at 500 Hz?
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subject could barely hear a 500 Hz tone at 40 dB about 50% of the time
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The problems produced by excessive ambient noise are:
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greater for the lower frequencies than the higher frequencies
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Before testing is done:
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the client's ears should be carefully examined using an otoscope
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The descending technique in pure tone audiometry is preferred because it:
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is easier to hear when a sound stops than when it begins
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Begin testing with the 1000 Hz tone because it:
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has good test re-test reliability
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The symbols used in the audiogram for air conduction are:
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uniform worldwide
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Individuals with a noise induced hearing impairment can have a 'V' notch at which frequency?
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*3000 Hz
*4000 Hz *6000 Hz |
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The loss of acoustic energy as it travels from the test ear to the non-test ear is a definition of:
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interaural attenuation
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To begin testing for air or bone conduction thresholds tests should begin at which frequency?
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1000 Hz
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If the outer and middle ear parts are normal:
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air thresholds will equal the bone thresholds
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In bone conduction testing the receiver should be:
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placed at the most sensitive spot on the mastoid of the test ear
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Sounds from the bone conduction receiver may stimulate the non-test ear at:
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10 dB or less
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A source of information that helps to identify which ear is responding to bone conduction stimuli is:
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*tympanometry
*acoustic reflex testing *bone conduction with masking |
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Bone conduction testing directly stimulates:
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the cochlea
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Most conductive losses:
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*are medically correctable
*display a breakdown or an obstruction in the middle ear *display good discrimination |
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Ambient noise in the environment during bone conduction testing will:
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affect the test results in the lower frequencies
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During the testing process, it is best to test bone conduction:
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after air conduction testing
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A conductive loss may be caused by:
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*perforations of the tympanic membrane
*immoblie middle ear ossicles *otitis media |
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Bone conduction thresholds worse than air conduction thresholds may be caused by:
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*poor placement of the vibrator
*a skull fracture *thickness of the skull |
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Sound being presented to one ear and then routed to the opposite ear is known as:
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*cross hearing
*shadow hearing *transcranial hearing |
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When the better ear 'answers' for the poorer ear what occurs?
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shadow curve
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Which noise is best for masking during pure tone air and bone conduction testing?
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narrow band noise
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Effective masking may be described as:
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*an increased masking noise that does not shift the threshold tone
*a formula method to determine how much masking noise is appropriate *a psychoacoustic method like the one proposed by Hood |
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Masking is performed during air conduction testing when:
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*a 40 dB or more difference occurs between the air conduction threshold of the better ear and the poorer ear
*a 40 dB or more difference occurs between the air conduction threshold of the poorer ear and the bone conduction threshold of the better ear |
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Masking is performed during bone conduction testing whenever:
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a 15 dB or more difference occurs between the obtained bone conduction threshold of the better ear and the obtained air conduction threshold of the poorer ear
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The occlusion effect occurs during:
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bone conduction testing causing thresholds to shift due to headphones being placed over the ear
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A masking dilemma occurs when:
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*it is impossible to mask
*the patient displays a bilateral conductive loss *masking can not be completed due to overmasking |
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Undermasking is defined as:
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occurring more often during air conduction testing
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Central masking can effect a threshold by:
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5 dB
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In a sensorineural hearing loss, air conduction thresholds are:
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the same as bone conduction thresholds
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An air-bone gap means the:
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air conduction thresholds are worse than bone conduction thresholds
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A sensorineural component is the difference between:
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BC thresholds and the range of normal hearing
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A pure conductive loss shows:
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all bone conduction thresholds within normal limits
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In a purely conductive loss:
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sound is reduced before its arrival at the inner ear
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A mixed loss exhibits:
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*a sensorineural component
*a conductive component |
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An audiogram with less loss at the high and low frequencies than the middle frequency region is classified as a:
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trough-shaped curve
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Pure Tone Average estimates:
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SRT
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To calculate PTA in a hearing loss when thresholds drop 15-20 dB or more at any or all frequencies:
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add the 2 frequencies with the least loss and ÷ 2
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PTA describes the following audiogram classification fairly accurately:
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*flat loss
*fragmentary audiogram |
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Although pure tones sound artificial to us, they have the advantage of:
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measuring a specific frequency without involvement of other frequencies
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Speech Reception Threshold:
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is a level above SDT by about 8-10 dB
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Dynamic Range is the usable range of hearing between:
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SRT and UCL
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The Most Comfortable Level is:
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*about 65 dB SPL for normal ears
*about 45 dB HL for normal ears |
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The range between threshold and MCL:
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differs at each frequency
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A patient with a conductive loss has:
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the same dynamic range as normal ears
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When patients have a sensorineural loss, MCL:
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retains a relationship with the lower boundary
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Recruitment is:
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common in patients with cochlear losses
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When a patient has normal pure tone thresholds of 0 dB HL across frequencies, it is difficult to accurately measure:
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SAT
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When a patient has a large conductive component, it is difficult to accurately measure:
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UCL
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Speech discrimination tests:
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approximate a sample of speech sounds in an ordinary conversation
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The patient has pure tone air conduction thresholds of 40 dB HL at each frequency. If the patient has a conductive hearing loss his MCL would be approximately:
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80 dB HL or above
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Discriminating complex sounds depend on:
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timbre
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In a complex sound the fundamental frequency is the:
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loudest frequency
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We recognize the different vowel sounds because of variations in:
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timbre
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A formant is:
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a concentration of energy around certain frequencies
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The most important energy for recognizing speech sounds are:
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second and third formants
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The upward spread of masking occurs when:
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a low frequency sound masks out a high frequency sound
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Masking is required for discrimination tests when:
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masking was used for air conduction tests
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Binaural testing:
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helps decide which ear to fit
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Tympanometry identifies:
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a measure of the dynamic compliance of the TM
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By convention, the range of pressure exerted in tympanometry range from:
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+200mm (H20) to -200mm (H20)
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The tympanogram measures:
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the intensity of the sound in the cavity between the probe tip and the TM
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The point of maximum compliance in a tympanogram represents:
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the point at which the pressure exerted through the probe tip exactly matches the pressure within the middle ear
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A "0"mm (H20) pressure reading means:
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that no pressure is being exerted on the TM
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Figure 14-3 represents what "Type" of tympangogram?
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Type A
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Figure 14-6 represents what "Type" of tympangogram?
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Type B
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Figure 14-7 represents what "Type" of tympangogram?
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Type C
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The configuration and height of the tympanogram can be a factor in deciding the proper matrix for the fitting of a hearing aid:
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A high type A tells us to decrease the output by 2-3 dB
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Tympanometry is effective in identifying:
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middle ear pathologies
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Sound cannot travel through the following medium or mediums:
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vacuum
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Any complex sound can be broken down into individual frequencies by a technique known as:
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Fourier spectral analysis
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How many octaves occur from 125 Hz to 2000 Hz?
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4 octaves
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The quality or timbre of a sound is a property that depends on:
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*how many frequencies are in the complex sound
*the relative strength of each frequency *the resonance of the sound cavity |
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The speed of sound in air, in feet per second, is:
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1,100
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What does the term "67 dB" mean?
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it is meaningless without a reference level
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The decible is:
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a ratio between two intensities
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The weakest sound normal human ears can hear is the most sensitive frequency range of the ear is an effective sound pressure of about:
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0.0002 dynes/cm²
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A formant is:
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a frequency region within a complex tone where certain harmonics have a relatively large energy
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The normal human ear canal resonance is in the approximate range of:
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2500 - 4000 Hz
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The harmonics of speech reinforce some frequencies more than others. The reinforced frequencies are:
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formants
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Vowels differ from the consonants in that they:
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use more open vocal cord voicing
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When tilting the frequency response, the last number in a matrix, i.e. 110/37/15, means:
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the 15 dB difference occurs between 500 Hz and the first peak
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The patient's MCL on a speech circuit of the audiometer is usually judged on
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the volume at 1000 Hz
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ANSI developed the Articulation Index (AI) to express:
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speech clarity
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'Positive reinforcement' involves:
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presenting a tone that is only inaudible without the instrument on
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Our quest of improving speech understanding begins by studying:
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speech production
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Most auditory systems follow the power law. This logarithmic concept is:
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a 10 dB increase in sound pressure doubles the loudness
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Sones compare:
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loudness up frequency
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Mels measure
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pitch
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Dexterity of a patient's finger enters into the choice of instruments because of the difficulty in:
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*inserting the earmold into the ear
*replacing the battery *adjusting the volume or any of the controls of the hearing aid |
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A bone conduction instrument should be used when:
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the patient has chronic otitis media
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A basic problem for clients with an asymmetrical hearing loss is:
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*discriminating speech from the side of the head with no usable hearing
*an inabilty to locate sound *hearing in the presence of noise |
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Pressure Measuring Instruments (PMI's) are :
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built to the sound pressure standard of 20 micropascals
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Properly selected hearing instruments should allow:
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*the patient to wear and instrument at a comfortable loudness level
*improve communication ability of normal conversation speech in noise *better hearing, aided, than unaided |
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Slope of loss can determine a succesful fitting. A modest favorable slope is:
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flat or gradually falling
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Calculations of amplified sound to patients MCL do not include:
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reserve gain
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Calculating prescription formulas are compared to:
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specification sheets
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Some patients with binaural amplifications can experience:
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degradation effect
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The following fitting requires amplification to two ears:
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binaural
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Functional gain testing with CIC instruments is:
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simple for the patient to understand with less test-retest variablility than conventional sound field testing
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With real ear measurement testing, which of the following is true:
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the probe should be within 5 mm of the eardrum in order to avoid standing waves
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The deeper microphone placement offers what advantage:
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natural high frequency emphasis between 2700 and 4000 Hz
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The deeper receiver placement offers what advantage:
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increased headroom wth undistorted output
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CIC's offer a reduction in feedback for the following reasons:
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*less venting is required with CIC's
*CIC's are more tight fitting *less gain is required |
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The Occlusion Effect is due to:
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increase in bone-conduction sound for frequencies below 2000 Hz.
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When the wind is coming from directly ahead, wind noise is reduced in CIC's by the following amount:
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23 dB
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The following are considered disadvantages for CIC fittings:
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*lack of volume control
*cost *higher return rate |
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Earmold impressions for CIC's should
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extend at least 2 mm beyond the second bend using medium viscosity, silicon material
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With CIC fittings, which of the following frequency modifications should be made:
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less high frequency amplification should be provided due to the deeper microphone placement
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The Zeta Noise Blocker was:
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an example of a hybrid analog-digital hearing instrument
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The first commercially available Digital Signal Processing hearing instrument:
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included a body-worn electronic processor
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A programmable hearing instrument with 4 channels and 1 memory card could be considered a ______ programmable hearing instrument.
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class 3
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In digital signal processing, a set of mathematical steps involving multiplication, addition, and subtraction is referred to as:
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an algorithm
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The number 512 would have a binary code of:
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1000000000
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The sampling rate:
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*refers to how often the waveform amplitude is measured
*has a direct bearing on the frequency bandwidth of the hearing instrument *must be at least twice as fast as the highest desired frequency |
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Quantization is related to:
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number of bits
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The number of bits impact the:
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dynamic range of the hearing instrument
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Imaging occurs during the:
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digital to analog conversion stage
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Which of the following is not an advantage attributable to digital signal processing in hearing instruments:
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use of active filters for frequency response shaping
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One of the following does NOT apply to SIE-O fitted hearing aids:
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Phase issues are not eliminated
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Which statement is correct relative to the comparison between the SIE-O and the SIE-S hearing instrument styles?
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The SIE-S provides greater acoustic advantages than does the SIE-O
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SIA hearing aids are designed primarily to
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Reduce occlusion and the occlusion effect
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SIA open-fit hearing aid applicable gains, without feedback cancellation, shows that the maximum stable gain before feedback to be closest to:
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20 dB
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The Vent as a two-channel device, is identified with:
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Any open fit or vented hearing aid
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Smaller diameter tubing of SIA hearing aids has the effect of:
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Reducing the high-frequency gain
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With SIE-E hearing aids:
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The only signal is from the hearing aid and phase effects from a vent are not an issue
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Evidence suggests that the practical, maximum stable high-frequency gain of an open-fit device, when feedback cancellation is activated, is closest to:
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35 dB
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Performance verification of SIA, SIE-O, and SIE-S hearing aid fittings is best made by:
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Real-ear probe microphone measurements
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One of the following is NOT a listed advantage of both the SIA and SIE hearing aid fittings:
|
Emphasis on earmold mechanics rather than electroacoustics
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When you cup your hand behind the ear, sound:
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increases by 5-8 dB
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This first patent for a telephone type hearing instrument was in:
|
1892
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The first electric hearing instrument:
|
collected and amplified sound
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The carbon granule microphone:
|
caused static and fading with body movement
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Desk and suitcase sized hearing instruments, popular in the 1920's, had more gain and clarity because of:
|
vacuum tube amplifiers
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Wearable instruments were a result of:
|
the miniature vacuum tube
|
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|
Crystal microphones and receivers
|
are very fragile
|
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A FET changed the high impedance problem of the:
|
ceramic microphone
|
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Magnetic microphones:
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have a good frequency response in the speech range
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The miniature vacuum tube was introduced in about:
|
1938
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The three major concepts in the use of electricity are:
|
current, voltage, and resistance
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A capacitor:
|
blocks the low frequencies and passes the high frequencies
|
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A resistor:
|
restricts the flow of electrons
|
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"Energy cannot be created or destroyed" is:
|
the law of conservation of energy
|
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The following is not a transducer:
|
volume control
|
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Electrical energy uses the atom. Atoms:
|
are electrically neutral
|
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|
Part of the basic law of electrical energy is:
|
protons attract electrons
|
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To produce current:
|
electrons move from atom to atom
|
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A greater flow of current produces:
|
more volume
|
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|
Semi-conductors act like a conductor with the application of:
|
heat, light or an electric field
|
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The function of a microphone is to:
|
convert acoustic energy into electrical energy
|
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Coupling in a hearing instrument refers to connecting:
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one stage of an amplifier to the next
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The 'T' position on a hearing aid switch can be use to:
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*amplify a telephone conversation
*couple a hearing aid into a loop inductor system *couple directly into the audio of a radio or TV set with a separate induction coil |
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The following components can change or modify the frequency response
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a microphone
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The following is a transducer:
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electret microphone
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Amplifiers:
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generate distortion
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A linear amplifier has 1:1 relationship. This means that if you rotate the volume control on a linear, you change:
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the gain and the output
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Hard peak clipping occurs in a:
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class A amplifier
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Peak rounding:
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causes harmonic distortion above the knee
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There are two types of compression - input and output. The difference is:
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the placement of the feedback loop
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The signal/noise ratio of a hearing response is:
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the difference in decibels between the signal and the noise in the system
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Acoustic gain is measured in:
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decibles SPL
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High Frequency Average (HFA) full-on gain is measured by averaging the gain at:
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1000, 1600, and 2500 Hz
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High Frequency Average SSPL 90 (HFA SSPL) refers to:
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high frequency average saturation sound pressure level with a 90dB SPL input
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The Saturation Sound Pressure level should:
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directly relate to the client's UCL
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ANSI standards can compare:
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one instrument to another
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The SSPL90 curve measures:
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all the tones across frequency
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All ANSI instrument measurements are:
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SPL
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Input sound pressure is measured:
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at the microphone opening of the hearing instrument
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Gain control is another name for:
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volume wheel
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A small pressure vent (0.020 to 0.030) in an earmold will:
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*have little or no effect on frequencies above 400 Hz.
*generally reduce levels at frequencies below 200 Hz. *reduce atmospheric pressure build-up |
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A long canal on the earmold has the effect of:
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accentuating the low frequencies
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Venting an earmold:
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is the most common modification on an earmold
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The non-occluding earmold is excellent to use on:
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a CROS fitting
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Earmolds have two important parts:
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outer appearance and canal acoustics
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The greatest acoustic change in an earmoldis or ITE is:
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parallel venting
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The greatest deciding factors in material selection for an earmold are:
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power requirements
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To shift the resonant peak upward between 1500-3000 Hz, use:
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large bore diameter
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In general, mold modifications are as follows:
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venting affects lows, damping the midrange and horn effects boost highs
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Which molds have the same outer appearance:
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skeleton and 2HF
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Residual hearing, in combination with the hearing instrument, will:
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help improve communication
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At night, the battery in the instrument:
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can be left in the open battery door
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A BTE instrument, properly attached:
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fits the contour of the ear
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An advantage of a CIC fitting is:
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*reduced acoustic feedback during phone use
*decreased wind noise |
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When adjusting the volume control, the patient must:
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find an area of the control where sounds are comfortable
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When a standard instrument has a telephone coil, the patient:
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switches to the 'T', then (b) above,
needs to increase the volume control |
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Advise the patient to wear the instrument:
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regularly on a daily basis (10-14 hours)
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Binaural amplififcation allows the patient to:
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wear both instruments at a quieter volume setting
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The patient maintains the instrument by:
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keeping it clean and free of wax
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Teach the patient to:
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operate the OTM switches and noise switches
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Basic verification involves:
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checking MCL and UCL in quiet and noise
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Verification procedures:
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check the accuracy of your fitting
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An effective verification is:
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a measurable improvement in communication
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Functional gain of the instrument:
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is one method of fitting verification
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Speech tests measured through the audiometer circuit:
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are 20 dB less because of ANSI Standards
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Ideally, when presenting recorded words in noise:
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the words are 10 dB louder than the noise
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Sound field is:
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a controlled environment
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Most patients use enough gain in the hearing instrument to understand quiet speech at a level of:
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55 dB SPL
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When UCL's are not balanced, a loud signal is perceived as:
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lateralizing to the ear with the higher output
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The following measurements use SPL as a reference:
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*probe microphones
*sound field aided thresholds *ANSI specifications |
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Which of the following is not a coupler used for measuring hearing aid performance:
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Zwisks Ear Simulator
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A Real Ear Measurement System incorporates all of the following:
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Signal Generator, Reference Microphone, Measurement Microphone, Display Device
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REUR Measurements are taken in:
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an open human ear canal
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At what distance from the Tympanic Membrane should the end of the probe tube be placed:
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Within 5 millimeters
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When testing compression hearing aids which signal is the best type to use:
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Fast Fourier Transform
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Loud speaker placement should be:
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1 meter at 45° azimuth
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Which of the following is not included in correct test protocols:
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Plugging the hearing aid vent to control feedback
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RESR Measurements for compression hearing aids have been replaced with:
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A family of curves starting at a soft level and gradually increasing in intensity
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Which of the following Real Ear Targets has been documented to be the best for Non-Linear Hearing Aids:
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None have been proven to be better than any other
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Insertion Loss occurs when:
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The level in the ear canal with a hearing aid inserted is less than the input level
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Follow-up care is a variety of procedures which comprise:
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*long term management of the client's needs and use of amplification
*a process which never ends while the client is under the care of the hearing aid specialist *bringing out the best that the instrument can give |
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Emphasizing counseling to maximize amplification benefits is:
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a program that should start before the fitting
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Aural rehabilitation:
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continues for as long as the patient wears an instrument
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Patients are always aware of:
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the way they hear today
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When the patient experiences difficulties, one of the problems could be:
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*a procedural flaw in the original hearing loss assessment
*an error in judgement in hearing instrument selection *misestimation of some aspect of the hearing problem |
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User satisfaction must include:
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patient preference
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Client acceptance involves counseling on:
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*emotional and social concerns
*attitude and motivation |
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Friends and family help patients wearing hearing instruments to hear better by:
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combining visual cues
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Your counseling avoids:
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unreasonable expectations
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Family and friends can have a negative influence on the patient by:
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expressing frustration that the patient does not have 'normal' hearing
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When a hearing aid sounds weak, hollow, distorted, or intermittent, the first check is:
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a weak battery
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An otoscope helps when cleaning the:
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the receiver
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When a hearing aid is dead, you can check receiver and microphone function by:
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turning the instrument to telecoil
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A hearing aid that works with the battery door slightly open, but shuts off when you close the door has:
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wires touching the battery
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You CANNOT use feedback checks when:
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checking the telephone coil
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An earhook damper is plugged when, during a feedback check:
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the instrument feeds back only when the coupler is removed
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A sign of a dirty volume control is:
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intermittent static
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Reduction of background noise can be improved by:
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directional microphones
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When a new hearing instrument has feedback at the patient's comfortable level, the problem is usually:
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too much wax in the ear canal
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An ITE or Canal aid has internal feedback when:
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the receiver tubing is not completely sealed to the sound bore
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