Compression
A healthy cochlea uses this style of compression processing
What is non-linear compression?
Distance from patient to speaker
What is 18-36 inches?
The minimum sampling rate at which a signal is sampled without introducing errors
Microphone that has equal sensitivity for all angles
Real ear measurements taken with hearing aid not on the ear
What are REUR and REUG?
Used to ensure the output is limited, and can cause distortion
What is peak clipping?
First step in real ear measurements
What is otoscopy?
OR
What is calibration?
Operates by magnetic forces
What are receivers?
Wind, resembles reverberation, steady-state sounds, and high intensity, transient sounds
What is noise?
Used to measure the gain provided by the concha and pinna
Displays amount of gain, whether linear or non-linear
What is an Input-Output Function?
Distance from probe tube to eardrum
What is ~5mm?
How receivers transduce energy
What is changing from electrical energy to acoustic energy?
Occurs because the rear port of the hearing aid contains an acoustic damper or resister
What is internal time delay?
Measured with hearing aid in and turn on
What are REAG and REIG?
Reduces low intensity environmental sounds and circuit noise without sacrificing speech intelligibility
What is expansion?
Recommended azimuth for real ear measures
What is 0 degrees?
Two different methods to modify sounds that enter a hearing aid
What are analog amplification and digital amplification?
Uses modulation detection to determine if the signal in each channel is noise
What is Gain-Reduction DNR?
Measure of SPL as a function of frequency when the hearing aid is in and turned off.
What is REOR?
Static compression properties not dependent on time
What are compression threshold, compression ratio, and compression range?
Used to covert HL thresholds to ear canal SPL
What is REDD?
When unwanted signals occur in the output of a DSP hearing aid
What is aliasing?
Directionality feature that independently programs frequency channels to directional or omnidirectional
What is split-channel directivity?
Used to verify prescriptive targets
What is REIG?