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Fitting Formulas
Compression
Advanced Signal Processing
Amplification Basics
100

Name two compression fitting formulas

NAL-NL2

NAL-NL1

DSLv5.0

NAL-NL3

LGOB

IHAFF

FIG6

SCALADAPT

100

A 1:1 compression ratio suggests what type of fitting?

A linear fit. 

100

What is the primary role of noise reduction?

Improve listening comfort/ease

100
Two adjustments a patient can make on their hearing aids by pushing their hearing aid button are ________ and ___________

VC and program change

200

What is another term for OSPL90?

MPO

200

What is the compression threshold?

The input level at which compression starts

200

How much improvement (in dB) is expected when utilizing directional microphones?

1-4 dB

200

___________ hearing aids utilize a rubber tube which connects the aid to the earmolds

BTEs

300
What is a cochlear dead region?

An area of the cochlea without IHCs

300

The inverse of compression is _____

Expansion
300

The sensitivity pattern of a microphone is known as a ___________

Polar plot

300

The most widely used electronic program that houses all manufacturer software, stores patient information, and allows for connectivity of the hearing aids is called _____________

NOAH

400

List two difficulties of creating a fitting formula

•Optimal gain is likely input dependent

•Optimal gain can be dependent on loudness perception and frequency resolution which is not easily measured

•Acclimatization

•Preferences vary dependent on if they prefer intelligibility or comfort which may vary dependent on what type of input it is

•Dead regions

•Varying configurations of hearing loss

400
What are the two main jobs of the OHCs?

Amplify and sharpen the traveling wave. 

400

List two reasons to utilize frequency lowering?

•Dead regions

•Areas that cannot be amplified

•Feedback potential

400

What is the second largest zinc-air battery size?

Size 13

500

Name one difference between NAL and DSL

NAL: maximize speech intelligibility, equalizing loudness, takes into account gender and experience

DSL: maximize speech audibility, loudness normalization, pediatrics, more low and high frequency gain, takes into account listening in noise and LDLs

500

In what type of scenario would short attack/release times be ideal?

Impulse noise reduction

500

Name three types of feedback suppression

•Gain-frequency response control/Notch filtering

•Phase control

•Feedback path cancellation

•Frequency shifting

500

The method of which a RIC receiver is "connected" to the ear canal is known as ___________

Coupling