HEARING INSTRUMENTS

 


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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

Author: Wayne Staab

Email: sales@frye.com

Home Page: www.frye.com

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