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Presentation on theme: "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."— Presentation transcript:


2 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)

3 2 Introduction to the FP35 Hearing Aid Analyzer v6.01 Software Kristina Frye Frye Electronics

4 3 The FONIX FP35 Hearing Aid Analyzer

5 4 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

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

7 6 Optional Accessories Include: Soft computer style carrying case

8 7 Optional Accessories Include: External sound chamber

9 8 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

10 9 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)

11 10 Function Keys [F1] to [F5] Help Print Reset Operate (On) Basic Operation

12 11 Exit Menu BackNext Arrow Keys Start/Stop Basic Operation

13 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

14 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. F3F2F4F1F5

15 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

16 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

17 16 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

18 17 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

19 18 Coupler Configurations Overview of testing a BTE

20 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 - center the BTE microphone over the loudspeaker. HA-2 coupler with BTE adapter.

21 20 Proper Set-Up for Testing an ITE Be sure leaks are sealed, or will have excessive 500 Hz gain

22 21 ANSI S 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]

23 22 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

24 23 ANSI 03 Results (AGC Aid) Average & Max Output Full On & Ref Test Gains Frequency Range Eq. Input Noise Frequency Response Curve Output (OSPL90) Curve Harmonic Distortion

25 24 ANSI 03 Results (continued) Input/Output Curves I/O Curves Key

26 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

27 26 Coupler Multicurve Screen F1– Delete curve F2 – Select curve F3 – Turn curve on/off F4 – Select source type F5 - Level Amplitude

28 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.

29 28 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

30 29 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

31 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

32 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 Recently improved to test aids with feedback suppression!

33 32 Example using DSP Aid ICRA Spectra ANSI Spectra Composite Signal

34 33 Battery Current Drain Plug the battery pill into the interior side of the sound chamber Battery current measurements will be automatically enabled

35 34 Harmonic Distortion Test Harmonic distortion can be measured during any pure-tone sweep by setting the DISTORTION type in the local menu to 2 ND, 3 RD, or TOTAL. Distortion scaling on right side of graph

36 35 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

37 36 Frequency Shift Test The DIG FS test defaults to 4000 Hz, but can be changed to any frequency between Hz in 100 Hz intervals F4 – Select DIG FS Dotted line represents the input signal The aid shifts the peak to 3000 Hz

38 37 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

39 38 Numerical Data Display To display numerical data select DATA in the DATA/GRAPH selection in the local menu

40 39 CIC Option Set the COUPLER TYPE to CIC in the local menu. CIC coupler HA-1 coupler

41 40 Open Fit Coupler The Open Fit coupler provides a more realistic frequency response than a 2-cc coupler and its easier to attach to the hearing aid.

42 41 FP35 Real-ear Measurements

43 42 The FP35 Real Ear Basic: Integrated probe microphone Calibration adaptors Extension pole for speaker

44 43 Optional Real-ear Accessories Infant headband set Swing-arm speaker Insert earphones and calibration adaptor for RECD

45 44 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

46 45 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.

47 46 Real-ear Configuration Use Built-in speaker Or use Optional external speaker

48 47 Audiogram Entry Screen F2 – Select HTL/UCL/Bone F3 – Generate Target Frequency Amplitude

49 48 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

50 49 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

51 50 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- F3F5 Note: No curves are measured in the Audiogram Entry screen

52 51 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

53 52 Proper Placement of Microphones Probe tube: marked 30 mm from the tip for Adults and 25 mm for children Ref Mic

54 53 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 doesnt matter The hearing aid can be inserted in the ear during leveling as long as it is turned off.

55 54 Real-ear SPL Screen UCLs Target (*) HTLs F2 – Select CurveF4 – Select Source Type Amplitude START/STOP

56 55 Real-ear SPL Measurements Aided 3 below UCLs Aided 2 meet target Aided 1 above HTLs Goal:

57 56 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

58 57 Visible Speech Setup with External Signals iPod or CD player

59 58 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

60 59 Third Octave analysis Two SPL analysis methods are available: 100 Hz FFT SPL: 79 measurement points every 100 Hz 3 RD Octave SPL: 17 measurement points unequally spaced with higher resolution in the low frequencies

61 Hz FFT vs Third Octave Analysis Third Octave analysis 100 Hz FFT analysis

62 61 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

63 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 scaling Difference between 100 Hz FFT and Third Octave analysis is 3 dB per octave

64 63 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.

65 64 Third Octave analysis on the FP35 analyzer Available in Real-ear SPL and Coupler Multicurve test screens.

66 65 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

67 66 Auto Test Enable Auto Test in the local menu. The Auto Duration setting is in the advanced menu (NEXT)

68 67 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

69 68 Aided & Unaided Screen Aided 1 Unaided

70 69 Insertion Gain Screen IG Target IG measured curves

71 70 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

72 71 Directional Display Forward measurement Reverse measurement

73 72 Directional Advantage Directional advantage

74 73 Coupler Targets Audiogram entered in Audiogram Entry screen, as normal RECD – Average or Measured Coupler Target screen Coupler EarSim screen

75 74 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 periodically 2) The real-ear measurement: Performed in the Audiogram Entry screen for each patient measured

76 75 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.

77 76 RECD Coupler FP35 Operation 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.

78 77 RECD Real-ear Physical Setup Insert probe microphone into ear Insert insert earphone into ear Marked 30 mm from the Tip for Adults and 25 mm for children Probe

79 78 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

80 79 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

81 80 Coupler Target Screen Coupler measurements Converted target

82 81 Coupler EarSim Screen Simulated real-ear measurements Real-ear target

83 82 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

84 83 Default Settings Screens F2: Change setting group F5: Save setting group

85 84 Choosing settings group F1: Change setting group The settings group may be chosen at the initial screen

86 85 Thank you for your time! Please should you require further Frye Electronics, 9826 SW Tigard St, Tigard, OR 97223, USA Tel: or Special thanks to David Evans of Connevans, UK and Dr Carol Sammeth who contributed to this presentation

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