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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
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 [email protected] 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