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Introduction to the 7000 Hearing Aid Test System By: Kristina Frye Frye Electronics, Inc.
Outline of this Presentation Real-ear Measurements Entering an Audiogram Real-ear SPL measurements Visible Speech Insertion Gain Coupler Measurements ANSI Coupler Multicurve Advanced Coupler: Enhanced DSP, Attack & Release, I/O, Battery Current
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. Noise Reduction on analyzer may interfere with anti-feedback phase shifting technology. Turn OFF noise red (comp) Real-ear targets may prescribe low frequency amplification unsuitable for open fit hearing aids.
Real-Ear Navigation Screen F1 — Audiogram Entry F3 — Insertion Gain F4 — Real-ear SPL Use the function keys to enter a screen F5 — Visible Speech
Entering an audiogram F1 — Select ear F2 — Select HTL/UCL/Bone F3 — Predict UCLs Real-Ear SPL only Adjust amplitude Adjust frequency
Real-ear NOAH Module Use the NOAH Module to easily import NOAH audiogram Right-click to send audiogram
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
Real-ear SPL Test Screen UCLs HTLs Low, Mid, & High Targets
NAL-NL1 Target Settings Press MENU from Real-ear SPL screen to open local menu Channels: 1-18 Aid Limit = Output limiting Ref. Position = Leveling conditions
Real-ear NOAH Module Use NOAH Module to send target settings
Reference Mic Step 1: Setup Speaker should be 12-18 inches from patient at 45 degree angle Probe Mic
NOAH Real-ear Module Use Get Curves to grab existing results from FONIX 7000
Using Real-ear Module Automatically uses latest NOAH audiogram Send audiogram and target to analyzer to measure with analyzer controls. Use Get Curves to grab tests results Or perform measurements using Windows controls
Audiometric Info tab Confirm NOAH Audiogram has been imported
Target Settings Check the target settings are correct
Test Setup Select Test Type Level Sound Field Speaker Select Curve to Measure Click Start
Real-ear SPL in NOAH Real-ear Module Select SPL & Real-ear Select curve to test Level sound field Start Test
Automatic Testing Run only selected curves Manual testing: Automatically advance to next curve after measurement
Fully Automatic Test Select the curves you want to measure Select “Run Measurements Automatically” Click Start
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 (optional) HTLs UCLs SII Reference microphone All on one graph in dB SPL
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.
Coupler Screen Operation Choose Ear Select CurveSource Type Amplitude
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
Example of digital aid test Digital Speech Composite
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
Attaching the Open Fit Coupler CRV 1 = Open Fit Coupler CRV 2 = HA-1 CRV 3 = HA-2 w/attachment CRV 4 = KEMAR
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
Forward/Reverse Positioning Forward positioning with hearing aid pointed towards sound chamber speaker Reverse positioning with hearing aid pointed away from sound chamber speaker
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
Programming Auto Mode F6 — Program Mode Help window w/instructions F5 — Source Type Amplitude START STOP Advance to next curve without pause Advance to next curve with pause
Example of Auto Test Digital Speech @ 50, 65, 80 dB Pure-tone sweep @ 90 dB F6 — Fully Automatic mode
Saving and Loading Settings Automatically load saved curve group and put analyzer in Auto Mode
Troubleshooter Profiler Great for baseline testing… save time!
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
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
Battery Current Screen Toggle estimated battery life Turn on/off freq graph Turn on/off amp graph Press START to measure graphs
Coupler I/O Test Results Frequency Test Results F5: Source Type
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
Attack & Release Results Frequency F5: Source type F6 & F7: Change graph scales
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?
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.
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.