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Introduction to the FP35

Kristina FryeFrye ElectronicsModified for the UK byDavid Evans, Connevans Limited

Thanks to Dr. Carol Sammeth, Ph.D. who wrote the original presentation that this one was based upon.

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The Fonix FP35

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The FP35 offers:

Quick & accurate coupler measurement An intuitive but versatile user interface On-screen pop-up help windows Multiple options for stimuli and

measurement settings Build-in thermal printer and RS232

capability

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Standard Accessories Include:

HA-1

& HA-2 couplers

BTE adaptor

Coupler microphone calibration adaptor

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Optional Accessories Include:

Soft computer style carrying case

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Optional Accessories Include:

External sound chamber

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Basic analyzer features:

Automated IEC test sequence Coupler Multicurve

– Up to 4 response curves in dB Gain or dB SPL– Harmonic and intermodulation distortion

Three types of pure-tone sweeps- pure tone sweep audio demonstration

Ability to set custom default settings

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Composite Option features:

Composite: Broadband signal consisting of 79 different frequencies presented simultaneously, updating up to five times a second

- audio demonstration Digital Speech: Modulated Composite signal

for testing digital hearing aids with noise suppression technology - audio demonstration

ICRA, ANSI, LTASS (DSL) speech weighting options with Composite & Digital Speech

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Function Keys [F1] to [F5]

Help

Print

Reset

“Operate” (On)

Basic Operation

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ExitMenu

Back Next

“Arrow” Keys

Start/Stop

Basic Operation

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Front-panel Buttons to remember

[MENU] : Enters/exits local menus [NEXT/BACK]: Moves between related

measurement screens and between main & advanced menus

“Arrow” keys: Moves cursor through choices, or to adjust frequency/level

[START/STOP]: Starts/stops selected function [EXIT] : Exits current screen, keeping curves [RESET]: Exits and clears data, resetting analyzer

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Function Keys – F1 through F5

Function keys vary from screen to screen but are always labeled above the F key

e.g. pressing [F2] in the Opening screen takes you to the “Real Ear Audiogram” screen if available.

F3F2 F4F1 F5

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Function Keys (Continued)

Holding down a key will offer a pop-up menu - use arrows and ‘START’ to select

Repeated presses rotate through selections

e.g. in the Coupler Multicurve screen, [F4] selects the source type for measurement

F4

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Local Menus

Every measurement screen has a local menu containing settings for that screen

Shown here is the local menu for the coupler Multicurve screen

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Additional Menu Choices

Some screens have additional menu choices. Use [NEXT] and [BACK] to move between the menus.

Shown here is the first of two advanced menus in the Coupler Multicurve screen

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Pop-up help windows can guide you through steps available in the current screen

Shown here are help steps for the Real-Ear Audiogram Entry screen if available

Onscreen Help

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Coupler Configurations

Overview of testing a BTE

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Proper Setup for Testing a BTE

Velcro in the sound chamber and on the coupler assists in keeping the unit in place during measurement - centre the BTE microphone over the loudspeaker.

HA-2 coupler with BTE adaptor.

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Proper Set-Up for Testing an ITE

Be sure “leaks” are sealed, or will have

excessive 500 Hz gain

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ANSI S3.22-1996

For quality control to ensure dispensed hearing aids match manufacturer’s specs

Compared to previous standard it offers:– Multiple I/O and attack/release measurements– AGC aids tested at reduced reference test gain

From the Opening Screen, press [F5] or [F4]

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ANSI ‘96 Setup

F1: Choose Aid Type

Reminder: Level the sound

chamber daily, or if room noise changes.

Press [MENU] to open local menu. Use arrow keys to make selections.

F2 & F3: Select I/O freq to test

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ANSI-’96 Results (AGC Aid)

Average &

Max Output

Full On & Ref Test Gains

Frequency Range

Eq. Input Noise

Frequency ResponseCurve

Output (OSPL90) Curve

HarmonicDistortion

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ANSI-’96 Results (AGC Aid continued)

Input/Output Curves

I/O Curves Key

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Coupler Multicurve Screen

Choose stimulus of pure tone (sweeps or single frequency), Composite, or Digital Speech

Measure/display a family of up to 4 frequency response curves

Show graph or data numerical values Measure/display harmonic and

intermodulation distortion

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Coupler Multicurve Screen

F1– Delete curve

F2 – Select curve

F3 – Turn curve on/off

F4 – Select source type

F5 - Level

Amplitude

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Coupler Local Menus

A useful option in the local ‘MENU’ is to switch between Gain and SPL display.

A second ‘Advanced’ menu is accessed using ‘Next’ key.

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Family of Curves

This curve family shows steady compression from 50 dB through 90 dB SPL Curve

box

Pressing ‘help’ explains the abbreviated curve codes

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Another Family of Curves

This curve family shows no compression between 50 and 80 dB SPL

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Testing Digital Aids

Some DSP aids have NR circuitry that reduces gain when the input signal is noise

The composite signal, because it is continuous and non-modulating, is seen by the circuitry as “noise”

Thus, gain is reduced in the aid while the composite signal is on, and thus the measurement is not accurate

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A Solution: The “Digital Speech” Signal

Switches Composite signal on/off intermittently in bursts

The “on” time can be set from 50 to 150 msec and the “off” time is randomly varied between 100 msec and 300 msec

Thus, the hearing aid responds as if the input is speech instead of noise (i.e., modulated instead of continuous)

ANSI, ICRA, and LTASS speech weightings are available with this stimulus too

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Numerical Data Display

To display numerical data select DATA in the DATA/GRAPH selection in the local menu

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Harmonic Distortion Test

Harmonic distortion can be measured during any pure-tone sweep by setting the DISTORTION type in the local menu to 2ND, 3RD, or TOTAL.

Distortion scaling on right side of graph

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Intermodulation Distortion Test

IM distortion can be measured by setting the IM FREQ DIFF in the advanced menu. This will create the DIST source type selection

F4 – Select DIST type

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Example using DSP Aid

ICRASpectra

ANSISpectra

Composite Signal

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CIC Option

Set the COUPLER TYPE to CIC in the local menu.

CIC coupler

HA-1 coupler

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FP35 Real-ear use

Click here to jump past real-ear information

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The FP35 real ear version Basic:

Probe/ref microphones and ear hook

Calibration adaptors Extension pole for

speaker

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The FP35 real ear version options:

Child-sized ear hook for real-ear measurements

Swing-arm speaker Insert earphones and calibration adaptor

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Real-Ear Option features:

Fitting rules: NAL-NL1, DSL Linear, DSL WDRC, NAL-RP, plus the traditional ones

Age correction factors for testing kids with NAL-NL1 and DSL

Insertion Gain & SPL-o-gram methods Coupler Target & Simulated Real-ear

NEW RECD

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FP35 Real-ear Screens

Audiogram entry screen Real-ear SPL screen Unaided & aided screen Insertion gain screen

Use the [NEXT] and [BACK] keys when in Real-ear Mode to cycle between these four screens.

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Real-ear Configuration

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Audiogram Entry Screen

F2 – Select HTL/UCL/Bone

F3 – Generate Target

Frequency

Amplitude

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Features

Fitting rules: NAL-NL1, DSL Linear, DSL WDRC, NAL-RP, plus the traditional ones

Age correction factors for testing kids with NAL-NL1 and DSL

RECD

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NAL-NL1 Features

Age of client (kids) Number of channels Bone conduction Bilateral vs. Unilateral loss Limiting: Multi-channel or Wideband Compression threshold

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Generating the Selected Target

Press [F3] to generate the target

Press [F5] to toggle between IG target and SPL target

Shown here is IG Target

Marked 30 mmfrom the Tip for Adultsand 25 mm for children

Inter-

F3 F5

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Set-up for Real Ear Measures

Internal sound chamber converts to sound field speaker; should be ear height

Recommend position patient 12” from the speaker at 45° angle

Stand away from the patient/loudspeaker during measurements

Probe

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Proper Placement of Microphones

Marked 30 mmfrom the tip for Adultsand 25 mm for children

Probe Mic

RefMic

Inter-TragalNotch

Above the Pinna

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Leveling the Sound Field Loudspeaker

Reminder: Re-level for each patient and each ear

Position patient and earhook/ref mic (probe tube insertion not required)

Press “Level” [F5] Success: a straight

line and indication that system was leveled

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Real-ear SPL Screen

UCLs

Target

HTLs

F2 – Select Curve F4 – Select Source Type

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Real-ear SPL Measurements

Aided 3 below UCLs

Aided 2 meet target

Aided 1 above HTLs

Goal:

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Insertion Gain

Aided & Unaided screen shows aided and unaided measurements in dB Gain or dB SPL

Insertion Gain screen shows resulting insertion gain curve & insertion gain target

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Aided & Unaided Screen

Aided 1

Unaided

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Insertion Gain Screen

IG Target

IG measured curves

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Live Speech Testing

Speech Banana

Amplitude Peaks

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Directional Hearing Aids

Perform two measurements: one with the speaker in front of the patient, the other with the speaker behind the patient

Use the Unaided & Aided screen for showing forward and reverse measurements

Use the Insertion Gain screen for showing directional advantage

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Directional Display

“Forward” measurement

“Reverse” measurement

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Directional Advantage

Directional advantage

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Coupler Targets

Audiogram entered in Audiogram Entry screen, as normal

RECD – Average or Measured Coupler Target screen Coupler EarSim screen

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Real-ear to Coupler Difference (RECD)

The acoustical difference between the 2-cc coupler and the real-ear unaided response on a patient (as measured with insert earphones)

Two measurements are needed:1) The coupler measurement:

Done when you “calibrate” the insert earphone by following instructions in the manual

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RECD Measurement

2) The patient measurement:

a custom earmold or foam ear tip coupled to the insert earphone is placed over the probe mic in the patient’s ear

Marked 30 mmfrom the Tip for Adultsand 25 mm for children

Probe

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RECD Results

Performed in Audiogram Entry Screen

Graphical & numerical (dB gain)

In this sample, the earphone needs to be calibrated

Probe

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Coupler Measurements with Targets

Coupler Target screen: Converts real-ear targets into coupler targets for comparison with coupler measurements

Coupler EarSim screen: Converts coupler measurements into simulated real-ear measurements for comparison with real-ear targets

Two ways of looking at the same info

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Coupler Target Screen

Coupler measurements

Converted target

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Coupler EarSim Screen

Simulated real-ear measurements

Real-ear target

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Entering default settings

The FP35 can memorise up to 3 default settings groups

To enter your default settings choose ‘MENU’ from the initial FONIX screen

‘NEXT’ will advance to a second screen

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Default Settings Screens

F2: Change setting group

F5: Save setting group

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Choosing settings group

F1: Change setting group

The settings group may be chosen at the initial screen

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Thank you for your time

Please email david@connevans.com should you require further information. To purchase an FP35 online for the UK

visit www.DeafEquipment.co.uk

Connevans Limited, 54 Albert Road North, Reigate, Surrey, RH2 9YR, UK.

Tel: 01737 247571