Signals & Transducers Flashcards
Describe weber’s test, the bing test, and the rinne test
Weber: Test of lateralization
Bing: Test of the occlusion effect
Rinne: Test comparing AC & BC
Where is the tuning fork placed in all three of these tests?
Weber - placed on the midline of the head
Bing - placed on the mastoid
Rinne - placed on the mastoid and in front of the ear
Weber’s test:
If sound is heard in better ear this means:
If sound is heard in poorer ear this means:
Better ear - unilateral sensorineural hearing loss
Poorer ear - conductive hearing loss
Bing test:
If pulsating sound is heard in ear this means:
If there is no change in loudness this means:
Pulsating sound - normal hearing or SNHL, positive bing
No change - conductive loss, negative bing
Rinne test:
If sound is louder next to ear this means:
If sound is louder on mastoid this means:
Next to ear - normal hearing or SNHL, positive rinne
On mastoid - conductive loss, negative rinne
Earphones change _ energy into _ energy
Electrical energy into acoustic
What are the 3 types of earphones?
Supra-aural
Circumaural
Insert
What has replaced tuning forks?
The bone conduction oscillator
The BCO changes _ energy into _ energy
Electrical energy into mechanical
The loudspeaker changes _ energy into _ energy
Electrical energy into acoustic
Describe a pure tone
A one-frequency tone with a sinusoidal formation (has no harmonics)
The basilar membrane does _ _ analysis of incoming auditory signals
Initial frequency
The basal end respond to _ frequencies while the apical end respond to _ frequencies
Basal = high frequencies Apex = low frequencies
Noise bands present energy at many:
Frequencies
When and why do we use noise bands?
Used in combination with other signals as a source of interference (masking)
What are 3 types of noise bands?
White noise
Narrowband noise
Speech noise
What is the most common and most complex signal we use?
The speech signal
The type of speech signal we choose to use is based on these 3 characteristics:
Spondees
Phonetically balanced
Familiarity
T/F The perceptual response is the most traditional response in audiology
T
What is an example of a perceptual response?
Pushing a button, saying “yes”, raising hand, ect.
T/F The physiological response is an active response
F it is a passive response
Physiological responses are used to asses the auditory system, not _ _
Not hearing thresholds
What are the 3 types of physiological responses?
Tympanometry
Otoacoustic emissions
Auditory Brainstem Response (ABR)
What 3 things does tympanometry measure?
Volume in the ear canal, mobility/compliance of the TM, pressure in middle ear
What does otoacoustic emissions measure?
The echo from the cochlea in response to stimulation
What does the auditory brainstem response measure?
Electrical activity in the brain in response to sound
When screening, a patient can either pass or _
Pass or refer
