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Introduction to the FONIX 7000 Hearing Aid Test System

Introduction to the FONIX 7000 Hearing Aid Test System. Software version 1.60. Outline. Coupler Measurements Basic (ANSI, Coupler Multicurve) Testing Digital Aids Open Fit Coupler Measuring directionality Automation Advanced Coupler Real-Ear Measurements Entering an audiogram

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Introduction to the FONIX 7000 Hearing Aid Test System

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  1. Introduction to the FONIX 7000 Hearing Aid Test System Software version 1.60

  2. Outline • Coupler Measurements • Basic (ANSI, Coupler Multicurve) • Testing Digital Aids • Open Fit Coupler • Measuring directionality • Automation • Advanced Coupler • Real-Ear Measurements • Entering an audiogram • Insertion Gain • Testing directionality • Real-ear SPL • Visible Speech • Testing Open Fit hearing aids • Default Settings

  3. Basic Coupler Measurements Coupler Multicurve — F1 ANSI 03 — F4

  4. ANSI 03 Settings Aid type Telecoil Frequencies Choose ear

  5. ANSI 03 Results Max OSPL90-HFA OSPL90 Distortion FOG EIN Response curve Telecoil Battery current Attack & Release I/O curves Telecoil

  6. Coupler Multicurve Features • Realistic frequency response measurements • Variety of signal types: Composite, Digital Speech, Pure-tone sweeps • Display 10 different curves simultaneously • Switch back and forth between gain and output. All curves translated.

  7. Coupler Screen Operation Amplitude Choose Ear Select Curve Source Type

  8. Example 50 dB 60 dB 70 dB 80 dB

  9. Testing Digital Aids • Digital Speech • Type of Composite signal • Modulated to allow testing of noise reducing digital aids • Used with ANSI or ICRA speech spectra

  10. Example of digital aid test Digital Speech Composite

  11. Testing Open Fit Hearing Aids • The Open Fit Coupler was designed to • Provide a realistic response for open fit hearing aids. • Provide an easy mechanism for attaching an open fit hearing aid to a coupler • The Open Fit Coupler is a non-standard sized coupler not designed to test to manufacturing specifications

  12. Attaching the Open Fit Coupler

  13. Testing Directionality • Use chamber design to perform “forward” and “reverse” measurements to obtain directional advantage • Chamber speaker mounted at 45 degree angle, pointing towards left side of chamber

  14. Forward/Reverse Positioning Forward positioning with hearing aid pointed towards sound chamber speaker Reverse positioning with hearing aid pointed away from sound chamber speaker

  15. Directional Advantage Forward measurement Reverse measurement 6 dB RMS Difference

  16. Coupler Automation • Set up own test sequence • Select signal type for each curve • Select signal amplitude for each curve • Add any desired pauses in test sequence • Save and auto load test sequence

  17. Programming Auto Mode Help window w/instructions F6 — Program Mode F5 — Source Type Amplitude START Advance to next curve without pause Advance to next curve with pause STOP

  18. Example of Auto Test Digital Speech @ 50, 65, 80 dB Pure-tone sweep @ 90 dB F6 — Fully Automatic mode

  19. Saving and Loading Settings Automatically load saved curve group and put analyzer in Auto Mode

  20. Advanced Coupler • Battery Current [F1] • Coupler I/O [F2] • Attack & Release [F3] • Enhanced DSP [F4] Function key operations available in the Advanced Coupler Navigation Screen

  21. Battery Current Screen • Measure Battery Current as a function of frequency • Measure Battery Current as a function of amplitude • Estimate battery life of hearing aid

  22. Battery Current Test Battery current by amp Battery current by freq

  23. Coupler I/O • Composite or Pure-tone source types • Any Freq from 200 to 8000 Hz in 100 Hz intervals • Display results in Output (SPL) or Gain • Graph and data results given

  24. Coupler I/O Test Results Test Results Frequency F5: Source Type

  25. Attack & Release Test Screen • Visual time graph of Attack and Release tests • Scale graphs independently to zoom in on results • Use Composite or Pure-tone • Choose any frequency from 200-8000 Hz in 100 Hz intervals • Customize amplitudes used in tests

  26. Attack & Release Results Frequency F5: Source type F6 & F7: Change graph scales

  27. Enhanced DSP • Designed to measure the "group delay" of a DSP aid. In other words, the actual digital processing time of a hearing aid. • 0 ms for analog aids • 1-12 ms for DSP • Great way to check if aid is analog or DSP • Also tests the "phase" of a hearing aid. This is useful for binaural fittings. Are the aids working together?

  28. Technical Details: Group Delay An impulse signal is delivered to the hearing aid. The time of the maximum peak of the response is considered the group delay. The 7000 system delay is subtracted from this value to obtain the final measurement.

  29. Technical Details: Phase One pulse of a 1000 Hz cosine signal is delivered to the aid. This signal is 1 msec long. The first 20 msec of the aid's response to the signal is displayed in graphical format.

  30. Example Group Delay Phase

  31. Basic Real-Ear measurements Use the function keys to enter a screen F1 — Audiogram Entry F2 — Target Edit F3 — Insertion Gain F4 — Real-ear SPL F5 — Visible Speech

  32. Entering an audiogram Adjust amplitude Adjust frequency Real-Ear SPL only F1 — Select ear F3 — Predict UCLs F2 — Select HTL/UCL/Bone

  33. Insertion Gain features • Unaided measurement • Up to 4 aided measurements • Gives up to 4 insertion gain measurements • Operation similar to coupler screen

  34. Insertion Gain screen Target Insertion Gain Aided Select amplitude Unaided F1 — Select ear F2 — Select curve F5 — Select source type

  35. Step 1: Setup Reference Mic Speaker should be 12 inches from patient at 45 degree angle ProbeMic

  36. Step 2: Level LEVEL

  37. Step 3: Unaided Measurement START STOP Peak at 3 kHz Amplitude Negative response at 6 kHz shows probe tube could probably be inserted more deeply F2 - REUR 1 F5 - DigSpeech

  38. Step 4: Aided/IG measurements IG Target IG curve F2 — REAR 2

  39. Multiple Aided/IG measures

  40. Testing Directionality Directional Advantage CRV 2 — Forward response CRV 1 — Reverse response

  41. Real-Ear SPL screen • Check low inputs are above thresholds • Check average inputs meet target • Check loud inputs are below UCLs • Auto-adjusting REUR shows amplification benefit at all levels • Gives overall look at hearing aid fitting • Operation similar to coupler & IG screens

  42. SPL operation U = UCLs H, M, L = Targets T = Thresholds

  43. Auto-Adjusting REUR Option REUR 1 automatically adjusts when the 80 dB REAR 4 curve is selected REAR 4 @ 80 dB REUR 1 adjusted to 80 dB

  44. Visible Speech • Use live speech signal • Real-time response (during test) • Average response • Minimum and maximum response per frequency for the length of the test • HTLs • UCLs • All on one graph in dB SPL

  45. Visible Speech: Before Test UCLs Targets HTLs

  46. Visible Speech: Test Results UCLs (off screen) Max boundary Avg Response HTLs Min boundary

  47. Open Fit Hearing Aids • Some Open Fit hearing aids interfere with the reference microphone measurements outside the ear. • Disable the Reference Microphone in the local menu to perform real-ear on these hearing aids. • Real-ear targets may prescribe low frequency amplification unsuitable for open fit hearing aids.

  48. Default Settings • Press [MENU] from the Opening Screen to enter the Setup Menu • Use [F1] in the Setup Menu to choose between: • General Settings • Coupler Settings • Real-ear Settings

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