Perscriptive Methods
HA Components
HA Styles/Candidacy
HA Candidacy/Some Acoustics
Earmolds
100
These are the prescriptive methods utilized today and in the Gally clinic.
What are DSLv5.0 and NAL-NL2?
100
The part of the hearing aid that converts sound energy into electricity.
What is a microphone?
100
The style of hearing aids that is the most durable
What is a behind-the-ear hearing aid?
100
Amplified sound from receiver finds a way back to microphone and gets re-amplified by the hearing aid
What is acoustic feedback?
100
These are the different types of domes
What are open, tulip, vented, power, sleeves, and round domes?
200
The absolute sound pressure level (SPL) is measured in the ear canal with the hearing aid turned on in response to a calibrated test signal.
What is Real Ear Aided Gain?
200
Strongest battery size, lasts the longest amount of time.
What is a 675 battery?
200
When sound is perceived louder binaurally than monoaurally.
What is loudness summation?
200
The graph of the average spectral distribution of speech across frequencies, measured over a long period of running speech.
What is the long-term average speech spectra?
200
It is important to reach this part of the ear during ear mold impressions.
What is the second bend of the ear canal?
300
The prescriptive method is based on loudness data averaged across many people with similar degrees of threshold loss. Gain prescribed for three input levels: 40, 65, and 95 dB SPL(Other levels by interpolation)
What is FIG6?
300
What is a cartoid polar plot?
300
Advantage to hearing the same signal in
both ears as the brain has two chances of
extracting the correct information
What is binaural redundancy?
300
This measure divides the speech spectrum into critical bands (1/3-octave), with each band assigned an importance weight (some bands matter more for intelligibility)
What is the Speech Intelligibility Index?
300
This impression technique involves using a bite block.
What is an open-mouth impression?
400
Triple bursts of Half-octave band noises are presented at random frequencies (250-4kHz) at random levels. Patients rate the loudness using a 7-point rating scale ranging from not audible (1) to too loud (7)
What is Loudness Growth in Half-Octave Bands?
400
The part of the hearing aid that utilizes the most power and where electrical waves are converted using electromagnetic induction (coils)
What is the receiver?
400
The hearing aid style that utilizaes the pinna effect for directionality.
In the Ear/ In the Canal
400
This phenomenon is a concern for low frequencies that are amplified with normal thresholds in the high frequencies.
What is the upward spread of masking?
400
This impression material differs in viscosity, contraction and after-cure, hardness-shore value
What is silicone?
500
The POGO formula for hearing thresholds above 65 dB.
IGi = 0.5Hi + ki + 0.5(Hi-65)
500
When this happens, peak clipping and distortion can occur.
What is the signal is larger than the amplifier specified maximum?
500
Requires the comparison of phase and amplitude difference between two ears, involves interaural time difference and interaural level difference
What is auditory localization?
500
This is normally assumed to be around 30 dB
What is speech dynamic range?
500
This vent size is recommended for HL of 50-60 dB
What is a 0.5-1 mm size vent?