Table of Contents
HEARING INSTRUMENTS
Hearing Aid Standards and Analysis
Couplers (artificial ears)
Hearing Aid Couplers
HA-3 and HA-4 2cc Couplers
Definitions
Basic Formula
Calculations
Hearing Aid Graphs
Basic Hearing Aid Graph Formats
1. Measurement of OSPL90
OSPL90 Graph
OSPL90 Description
2. Measurement of Full-On Gain
Full-On Gain Curve
Full-On Gain Description
SPA Gain
3. Reference Test Gain Position
Measurements made at RTGP
ANSI Curve Descriptions
Frequency Range Calculation
Measurements made at RTGP (cont.)
AGC Measurement
Time Constants (AGC Hearing Aids)
Gain and Output (OSPL90) Curves
Gain and OSPL90 Curves on Same Graph
Coupler Gain in SPL
OSPL90 and Gain Curve Variations
Phonak Matrices
Hearing Aid Graphs With Data
IEC vs. ANSI
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Author: Wayne Staab
Email: sales@frye.com
Home Page: www.frye.com
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