Transcript FP35 Features and Options

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1
Introduction to the
FP35 Hearing Aid Analyzer
v6.01 Software
Kristina Frye
Frye Electronics
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The FONIX FP35 Hearing Aid
Analyzer
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The FP35 offers:
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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
Standard Accessories Include:
HA-1
& HA-2 couplers
BTE adaptor
Coupler microphone
calibration adaptor
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Optional Accessories Include:
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Soft computer style
carrying case
Optional Accessories Include:
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External sound chamber
Basic analyzer features:
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Automated ANSI or IEC test sequence
Coupler Multicurve
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Four types of pure-tone sweeps
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Up to 4 response curves in dB Gain or dB SPL
Harmonic and intermodulation distortion
pure tone sweep audio demonstration
Ability to set custom default settings
Composite/Digital Speech features
(Now included standard)
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Composite: Broadband signal consisting of 79
different frequencies presented simultaneously,
updating up to five times a second
- audio demonstration
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Digital Speech: Modulated Composite signal for
testing digital hearing aids with noise suppression
technology
- audio demonstration
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ICRA, ANSI, LTASS (DSL) speech weighting
options with Composite & Digital Speech
Basic Operation
Print
Help
Reset
“Operate” (On)
Function Keys [F1] to [F5]
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Basic Operation
Menu
Back
Exit
Next
“Arrow” Keys
Start/Stop
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Front-panel Buttons to remember
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[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
Function Keys – F1 through F5
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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.
F1
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F2
F3
F4
F5
Function Keys (Continued)
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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
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Every measurement
screen has a local
menu containing
settings for that
screen
Shown here is the
local menu for the
coupler Multicurve
screen
Additional Menu Choices
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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
Onscreen Help
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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
Coupler Configurations
Overview of
testing a BTE
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Proper Setup for Testing a BTE
HA-2 coupler
with BTE
adapter.
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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.
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
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For quality control to ensure dispensed hearing
aids match manufacturer’s specs
Compared to previous standard it offers:
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Multiple I/O and attack/release measurements
AGC aids tested at reduced reference test gain
From the Opening Screen, press [F5] or [F4]
ANSI 03 Setup
Reminder:
Level the sound
chamber daily, or if
room noise
changes.
Press [MENU] to open
local menu. Use arrow
keys to make selections.
F1: Choose Aid
Type
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F2 & F3: Select I/O freq to test
ANSI 03 Results (AGC Aid)
Average &
Max Output
Output (OSPL90)
Curve
Frequency Response
Curve
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Full On & Ref
Test Gains
Eq. Input Noise
Frequency
Range
Harmonic
Distortion
ANSI 03 Results (continued)
Input/Output
Curves
I/O Curves
Key
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Coupler Multicurve Screen
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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
Coupler Multicurve Screen
Amplitude
F1–
Delete curve
F2 –
Select curve
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F3 –
Turn curve
on/off
F5 - Level
F4 – Select
source type
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
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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
A Solution:
The “Digital Speech” Signal
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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!
Example using DSP Aid
ICRA
Spectra
ANSI
Spectra
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.
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Distortion
scaling on
right side
of graph
Frequency Shifting Hearing aids
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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
Frequency Shift Test
Dotted line
represents
the input
signal
The DIG FS test
defaults to 4000 Hz,
but can be changed
to any frequency
between 200-8000 Hz
in 100 Hz intervals
The aid shifts
the peak to
3000 Hz
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F4 – Select
DIG FS
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:
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Integrated probe
microphone
Calibration adaptors
Extension pole for
speaker
Optional Real-ear Accessories
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Infant headband set
Swing-arm speaker
Insert earphones and calibration adaptor for
RECD
Real-Ear features:
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Fitting rules: NAL-NL1, MOD NAL, DSL, NALRP, 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
FP35 Real-ear Screens
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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
Amplitude
Frequency
F2 – Select
HTL/UCL/Bone
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F3 – Generate Target
Features
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Fitting rules: NAL-NL1, MOD NAL, DSL, NALRP, plus the traditional ones
Age correction factors for testing kids with
NAL-NL1, MOD NAL, and DSL
RECD
NAL-NL1 & MOD NAL Features
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Age of client (kids)
Number of channels
Bone conduction
Bilateral vs. Unilateral loss
Limiting: Multi-channel or Wideband
Compression threshold
Generating the Selected Target
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Press [F3] to
generate the
target
Press [F5] to
toggle
between IG
target and SPL
target
Shown here is InterIG Target
F3
F5
Note: No curves are measured in the Audiogram Entry screen
Set-up for Real Ear Measures
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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
Ref
Mic
Probe tube:
marked 30 mm
from the tip for
Adults
and 25 mm for
children
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Leveling the
Sound Field Loudspeaker
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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.
Reminder: Re-level for each patient and each ear
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Real-ear SPL Screen
UCLs
Target (*)
Amplitude
HTLs
START/STOP
F2 – Select Curve
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F4 – Select
Source Type
Real-ear SPL Measurements
Goal:
Aided 3 below UCLs
Aided 2 meet target
Aided 1 above HTLs
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Visible Speech
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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 downarrow key repeatedly
Press START/STOP to start the measurement
Visible Speech Setup with External
Signals
iPod or CD
player
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Visible Speech Testing
REF = Input
signal level
Peak Pulsed
average
(diamonds)
Source OFF
Real-time curve
F2 – Select
AIDED curve
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F4 – COMP or
DIG SPCH
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
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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
100 Hz FFT Analysis vs Third
Octave
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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)
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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
scaling
Difference between 100 Hz FFT and Third Octave analysis
is 3 dB per octave
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Important Notes
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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.
Third Octave analysis on the FP35
analyzer
Available in
Real-ear SPL
and Coupler
Multicurve
test screens.
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Auto Test
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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
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
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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
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
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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
Directional Display
“Forward” measurement
“Reverse” measurement
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Directional Advantage
Directional
advantage
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Coupler Targets
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Audiogram entered in Audiogram Entry screen,
as normal
RECD – Average or Measured
Coupler Target screen
Coupler EarSim screen
Real-ear to Coupler Difference
(RECD)
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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 periodically
2) The real-ear measurement: Performed in the
Audiogram Entry screen for each patient
measured
RECD Coupler Physical Setup
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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.”
RECD Coupler FP35 Operation
1.
2.
3.
4.
5.
6.
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Press [MENU] from the Opening
screen to enter the Default
Settings screen
Press [F3] to go to the
Calibration Screen
Press [F4] to go to the
Earphone Calibration Screen
Press [START/STOP] twice to
perform the measurement
Press [F5] and [START/STOP]
to save the coupler RECD.
Use the down arrow to select
Calibrate Ins. Earphone (RECD)
and repeat steps 4-5.
RECD Real-ear Physical Setup
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Insert probe microphone
into ear
Insert insert earphone
into ear
Marked 30 mm
from the Tip for Adults
and 25 mm for children
Probe
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RECD Real-ear FP35 Operation
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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
F3 – Select
RECD
Measure RECD
Coupler Measurements with
Targets
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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
Coupler Target Screen
Converted target
Coupler
measurements
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Coupler EarSim Screen
Real-ear target
Simulated real-ear
measurements
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Entering default settings
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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
Default Settings Screens
F2: Change
setting group
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F5: Save
setting group
Choosing settings group

The settings
group may
be chosen at
the initial
screen
F1: Change
setting group
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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
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Special thanks to David Evans of Connevans, UK and
Dr Carol Sammeth who contributed to this
presentation