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Introduction to the FP35 Hearing Aid Analyzer

v6.01 Software

Kristina FryeFrye Electronics

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The FONIX FP35 Hearing Aid Analyzer

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The FP35 offers:

Quick & accurate coupler measurements 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 Optional real-ear measurements

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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 ANSI or IEC test sequence Coupler Multicurve

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

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

Ability to set custom default settings

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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

Composite/Digital Speech features(Now included standard)

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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 Advanced Menu 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 - center the BTE microphone over the loudspeaker.

HA-2 coupler with BTE adapter.

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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 S3.22-2003

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 03 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 03 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 03 Results (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 linear amplification up to 60 dB and compression from 60 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 70 dB SPL with output limiting starting at 80 dB SPL for this high gain hearing aid

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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

Recently improved to test aids with feedback suppression!

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Example using DSP Aid

ICRASpectra

ANSISpectra

Composite Signal

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Battery Current Drain

Plug the battery pill into the interior side of the sound chamber

Battery current measurements will be automatically enabled

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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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Frequency Shifting Hearing aids

Some hearing aids “compress” the frequency response of the input signal in order to amplify at frequencies where the patient has residual hearing

The DIG FS input signal produces a pure-tone signal and measures the response across the entire frequency band so you can see where that signal is being amplified

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Frequency Shift Test

The DIG FS test defaults to 4000 Hz, but can be changed to any frequency between 200-8000 Hz in 100 Hz intervals

F4 – Select DIG FS

Dotted line represents the input signal

The aid shifts the peak to 3000 Hz

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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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Numerical Data Display

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

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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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Open Fit Coupler

The Open Fit coupler provides a more realistic frequency response than a 2-cc coupler and it’s easier to attach to the hearing aid.

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FP35 Real-ear Measurements

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The FP35 Real Ear Basic:

Integrated probe microphone

Calibration adaptors Extension pole for

speaker

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Optional Real-ear Accessories

Infant headband set Swing-arm speaker Insert earphones and calibration adaptor

for RECD

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Real-Ear features:

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

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

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

Use Built-in speaker

Or use Optional external speaker

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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, MOD NAL, DSL, NAL-RP, plus the traditional ones

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

RECD

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NAL-NL1 & MOD NAL 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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Press [F3] to generate the target

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

Shown here is IG Target

Generating the Selected Target

Inter-

F3 F5

Note: No curves are measured in the Audiogram Entry screen

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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

Probe tube: marked 30 mmfrom the tip for Adultsand 25 mm for children

RefMic

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Leveling the Sound Field Loudspeaker

Reminder: Re-level for each patient and each ear

Position patient and earhook/microphone (probe tube insertion optional)

Go to REM test screen (Real-ear SPL, Real-ear Unaided & Aided, or Real-ear Insertion Gain) using [NEXT] and [BACK].

Press “Level” [F5] and [START/STOP] Leveling only uses the reference

microphone so probe placement doesn’t matter

The hearing aid can be inserted in the ear during leveling as long as it is turned off.

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Real-ear SPL Screen

UCLs

Target (*)

HTLs

F2 – Select Curve F4 – Select Source Type

Amplitude

START/STOP

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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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Visible Speech

Use Live Speech or Pre-recorded Speech from an attached CD player or iPod

Set the source type to COMP (or DIG SPCH) with F4

Set the source level to OFF using the down-arrow key repeatedly

Press START/STOP to start the measurement

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Visible Speech Setup with External Signals

iPod or CD player

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Visible Speech Testing

Real-time curve

Peak Pulsed average (diamonds)

F4 – COMP or DIG SPCH

F2 – Select AIDED curve

Source OFF

REF = Input signal level

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Third Octave analysis

Two SPL analysis methods are available: 100 Hz FFT SPL: 79 measurement points

every 100 Hz 3RD Octave SPL: 17 measurement points

unequally spaced with higher resolution in the low frequencies

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100 Hz FFT vs Third Octave Analysis

Third Octave analysis

100 Hz FFT analysis

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First: Thought Experiment 100 Hz vs 50 Hz Analysis

Think of the output of a frequency response as energy.

Each point on the response is a “bin.”

More bins = better resolution, less output per bin

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100 Hz FFT Analysis vs Third Octave

All FONIX analyzers perform “100 Hz FFT” analysis

Frequency response is divided into 79 different points that are 100 Hz equidistant (200, 300, 400… 7900, 8000 Hz)

In Third Octave analysis, frequency response is divided into 17 different points: 200, 250, 315, 400, 500, 630, 800, 1000, 1250, 1600, 2000, 2500, 3150, 4000, 5000, 6300, and 8000

Third Octave analysis has better resolution in the low frequencies and less resolution in the high frequencies due to logarithmic scalingDifference between 100 Hz FFT and Third Octave analysis

is 3 dB per octave

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Important Notes

This 3 dB per octave difference only occurs when viewing results in terms of dB SPL (coupler or real-ear). Gain measurements are not affected.

This difference only occurs when using broadband signals. During a pure-tone sweep, only one “bin” is filled at a time, so the energy is not distributed.

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Third Octave analysis on the FP35 analyzer

Available in Real-ear SPL and Coupler Multicurve test screens.

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Auto Test

When enabled, it measures all three aided measurement curves sequentially

The measurement time for each curve can be changed in the Advanced Menu

The “unaided” curve is not part of the Auto Test Sequence

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Auto Test

Enable Auto Test in the local menu. The Auto Duration setting is in the advanced menu (NEXT)

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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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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: Performed in

the Calibration screen only periodically2) The real-ear measurement: Performed in

the Audiogram Entry screen for each patient measured

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RECD Coupler Physical Setup

Insert coupler microphone into HA-2 coupler

Connect insert earphone to HA-2 coupler

Plug insert earphone into the back of the FP35 analyzer in the plug marked “Earphone.”

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RECD Coupler FP35 Operation

1. Press [MENU] from the Opening screen to enter the Default Settings screen

2. Press [F3] to go to the Calibration Screen

3. Press [F4] to go to the Earphone Calibration Screen

4. Press [START/STOP] twice to perform the measurement

5. Press [F5] and [START/STOP] to save the coupler RECD.

6. Use the down arrow to select Calibrate Ins. Earphone (RECD) and repeat steps 4-5.

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RECD Real-ear Physical Setup

Insert probe microphone into ear

Insert insert earphone into ear

Marked 30 mmfrom the Tip for Adultsand 25 mm for children

Probe

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RECD Real-ear FP35 Operation

Go to Audiogram Entry screen

Use F2 to select the RECD Use F3 to set Measure Press [START/STOP] to

perform the real-ear measurement

Results are displayed in numerical and graphical format. The RECD is automatically used in all relevant conversions.

Probe F2 – Select RECD

F3 – Select Measure RECD

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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 kris@frye.com should you require further information.

Frye Electronics, 9826 SW Tigard St, Tigard, OR 97223, USA

Tel: 503-620-2722 or 800-547-8209

Special thanks to David Evans of Connevans, UK and Dr Carol Sammeth who contributed to this presentation