AC
Air Conduction
AGC
Automatic Gain Control
ALD
Assistive Listening Device
ANSI
American National Standards Institute
AOV Acoustically Optimized Venting (Phonak)
ASP
Automatic Signal Processor
AVC
Automatic Volume Control
BC
Bone Conduction
BTE
Behind the ear hearing instrument
CFA
Continuous Flow Adapter (earmold)
CL
Comfortable Level
CNS
Central Nervous System
CNT
Can Not Test
CPS
Cycles Per Second
CROS Contralateral Routing of Signals
dB
decibels
dBA
decibels on a scale of a sound level meter
DNR
did not respond
DNT
did not test
DR
Dynmaic Range
DS
Discrimination Score
ENT
Ear, Nose and Throat Specialist
EM
Effective Masking
FF
Free Field
FOG
Full on Gain
HAE
Hearing Aid Evaluation
HD
Harmonic Distortion
HFA
High Frequency Average
HL
Hearing Level
HTL
Hearing Threshold Level
Hz
Hertz
IA
Interaural Attenuation
ID
Inside Diameter (usually tubing)
IE
In–the–ear hearing instrument
IL
Intensity Level
IM
Intermodulation Distortion
IHS
International Hearing Society
JND
Just Noticeable Difference
KEMAR
KHz
Knowles Electronic Manikin for Acoustical Research
Kilhertz
LDL Loudness Discomfort Level (see UCL)
Ln
Equivalent Input Noise Level
LL
Loudness Level
MCT
Minimum Contact Technology
MCL
Most Comfortable Loudness
MPO Maximum Power Output
MSP
Multiple Signal Processor
a
Number of subjects involved in a test
NAEL National Association of Earmold Laboratories
NR
No Response
OD
Outside Diameter (usually tubing)
PB
Phonetically Balanced
PTA
Pure Tone Average
PTS
Permanent Threshold Shift
REAR Real ear aided response
RECD Real-Ear-to-Coupler-Difference is the sound pressure level (SPL) difference between the 2 cc
coupler as used in hearing aid specifications and measurements and the actual measurement
obtained within a specific ear canal. Esp. important for pediatrics.
REIG Real ear insertion gain
REIR
Real ear insertion response
REOR Real ear occluded response
REUR Real ear unaided response
RMS
Root mean square (a composite tone)
RTG
Reference Test Gain
RTP
Reference Test Position
SAT
Speech Awareness Threshold
SAV
Select–a–vent
SDS
Speech Discrimination Score
SDT
Speech Detection Threshold
SF
Sound Field
SIL
Speech Interference Level
SISI
Short Increment Sensitivity Index
SL
Sensation Level
SLM
Sound Level Meter
S/N
Signal to Noise
SPL
Sound Pressure Level
SRT
Speech Reception Threshold
SSPL
Saturation Sound Pressure Level
TD
Threshold of Discomfort
THD
Total Harmonic Distortion
TK Threshold Kneepoint
TL
Tolerance Level
TM
Tympanic Membrane
TMJ
Temporomandibular Joint
TTS
Temporary Threshold Shift
UCL
Uncomfortable Loudness (see LDL)
VU
VU Meter on Audiometer