Viewers notes ''' to help you

1
Viewers notes ... to help you

• At the bottom left of each page there is a page
  number, when the slide has finished an automated
  sequence a small star appears in the bottom right
  hand corner to indicate that the slide may be
  advanced when you are ready.
• To run the presentation
• 1. Click on the screen to make sure that the
  presentation window is selected.
• 2. Use the space bar to advance (page up
  should reverse)

2
Introduction to the FP35

• Kristina Frye
• Frye Electronics
• Modified for the UK by
• David Evans, Connevans Limited

Thanks to Dr. Carol Sammeth, Ph.D. who wrote the
original presentation that this one was based
upon.
3
The Fonix FP35
4
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

5
Standard Accessories Include
HA-1
HA-2 couplers
BTE adaptor
Coupler microphone calibration adaptor
6
Optional Accessories Include

• Soft computer style carrying case

7
Optional Accessories Include

• External sound chamber

8
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

9
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

10

Basic Operation

Print
Help
Reset
Operate (On)
Function Keys F1 to F5
11

Basic Operation

Exit
Menu
Back
Next
Arrow Keys
Start/Stop
12
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

13
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.

F3
F2
F4
F1
F5
14
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
15
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

16
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

17
Onscreen Help

• 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

18
Coupler Configurations
Overview of testing a BTE
19
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.
20
Proper Set-Up for Testing an ITE
Be sure leaks are sealed, or will have
excessive 500 Hz gain
21
ANSI S3.22-1996

• For quality control to ensure dispensed hearing
  aids match manufacturers 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

22
ANSI 96 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
F2 F3 Select I/O freq to test
23
ANSI-96 Results (AGC Aid)
Average Max Output
Full On Ref Test Gains
Output (OSPL90) Curve
Eq. Input Noise
Frequency Range
Frequency Response Curve
Harmonic Distortion
24
ANSI-96 Results (AGC Aid continued)
Input/Output Curves
I/O Curves Key
25
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

26
Coupler Multicurve Screen
Amplitude
F1 Delete curve
F5 - Level
F3 Turn curve on/off
F2 Select curve
F4 Select source type
27
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.
28
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
29
Another Family of Curves
This curve family shows no compression between 50
and 80 dB SPL
30
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

31
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

32
Numerical Data Display
To display numerical data select DATA in the
DATA/GRAPH selection in the local menu
33
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
34
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
35
Example using DSP Aid

ICRA Spectra
ANSI Spectra
Composite Signal
36
CIC Option
CIC coupler
Set the COUPLER TYPE to CIC in the local menu.
HA-1 coupler
37
FP35 Real-ear use
Click here to jump past real-ear information
38
The FP35 real ear version Basic

• Probe/ref microphones and ear hook
• Calibration adaptors
• Extension pole for speaker

39
The FP35 real ear version options

• Child-sized ear hook for real-ear measurements
• Swing-arm speaker
• Insert earphones and calibration adaptor

40
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

41
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.
42
Real-ear Configuration
43
Audiogram Entry Screen
Amplitude
Frequency
F3 Generate Target
F2 Select HTL/UCL/Bone
44
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

45
NAL-NL1 Features

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

46
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 mm from the Tip for Adults and 25 mm
for children
Inter-
F3
F5
47
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
48
Proper Placement of Microphones
Ref Mic
Above the Pinna
Marked 30 mm from the tip for Adults and 25 mm
for children
Inter-Tragal Notch
Probe Mic
49
Leveling the Sound Field Loudspeaker

• Position patient and earhook/ref mic (probe tube
  insertion not required)
• Press Level F5
• Success a straight line and indication that
  system was leveled

Reminder Re-level for each patient and each ear
50
Real-ear SPL Screen
UCLs
Target
HTLs
F2 Select Curve
F4 Select Source Type
51
Real-ear SPL Measurements
Goal
Aided 3 below UCLs
Aided 2 meet target
Aided 1 above HTLs
52
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

53
Aided Unaided Screen
Aided 1
Unaided
54
Insertion Gain Screen
IG Target
IG measured curves
55
Live Speech Testing
Amplitude Peaks
Speech Banana
56
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

57
Directional Display
Forward measurement
Reverse measurement
58
Directional Advantage
Directional advantage
59
Coupler Targets

• Audiogram entered in Audiogram Entry screen, as
  normal
• RECD Average or Measured
• Coupler Target screen
• Coupler EarSim screen

60
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

61
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 patients ear

Marked 30 mm from the Tip for Adults and 25 mm
for children
Probe
62
RECD Results

• Performed in Audiogram Entry Screen
• Graphical numerical (dB gain)
• In this sample, the earphone needs to be
  calibrated

Probe
63
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

64
Coupler Target Screen
Converted target
Coupler measurements
65
Coupler EarSim Screen
Real-ear target
Simulated real-ear measurements
66
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

67
Default Settings Screens
F2 Change setting group
F5 Save setting group
68
Choosing settings group

• The settings group may be chosen at the initial
  screen

F1 Change setting group
69
Thank you for your time
Please email david_at_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 [phone]
70
Presentation outline

• Analyzer features options
• Basic operation
• Coupler measurements
• Real-ear measurements
• Simulated real-ear/coupler targets
• Default settings

71
Soft Carrying Case
72
Coupler Measurements

• Physical setup
• ANSI 96
• Coupler Multicurve screen
• Frequency response curves
• Harmonic distortion
• Intermodulation distortion