Presentation on theme: "Real-ear Measurements with the A-35 Presented by: Kristina Frye Frye Electronics, Inc."— Presentation transcript:
Real-ear Measurements with the A-35 Presented by: Kristina Frye Frye Electronics, Inc
Topics Interface from the A-35 Entering an Audiogram and Creating a Target Performing Insertion Gain Measurements Measurements in SPL: Comparing HTLs and UCLs Testing with Visible Speech Testing Open Fit Hearing Aids Doing all this from the FONIX NOAH Module
FP35 Real-ear Screens Audiogram Entry Real-ear SPL Unaided & Aided Insertion Gain Move between these four screens by using NEXT and BACK
NAL-NL1 Target Settings Press MENU and BACK to change target settings Compression Channels (1-18) Aid Limiting (Type of output limiting) Fit Type (Unilateral or Bilateral) Reference (Almost always Head Surface) The Compression and Channels settings have the most impact on the target!
Insertion Gain Testing Press NEXT until you enter the Real-ear Insertion Gain screen
Traditional Real-ear Protocol Measuring the Insertion Gain Response
Let’s get sidetracked for a few minutes… PROS and CONS of Measuring the Unaided Response
Save Time! To save testing time, you can probably skip the unaided response measurement! Thresholds are measured with an occluded response Targets are generated from those thresholds Many hearing aids alter the ear canal resonance when inserted, so the unaided response is extraneous data
Exceptions Fitting a mild/moderate loss: Make sure that the hearing aid is proving a benefit to the patient Checking the position of the probe microphone When is the unaided response useful?
Back to the Protocol…
Proper Placement of Microphones Marked 30 mm from the tip for Adults and 25 mm for children Probe Mic Ref Mic Inter-Tragal Notch Above the Pinna
Level the Sound Field Speaker Internal sound chamber converts to sound field speaker; should be ear height 12 inches from the speaker at 45° angle Stand away from the patient/loudspeaker during measurements The hearing aid (if silent) and/or probe tube can be inserted during leveling Press F5 and START in the Real-ear Measurement screen to level the sound field speaker
Choose the Curve with F2 Four Curves Available Unaided Ins. Gain #1: 50 dB Ins. Gain #2: 70 dB Ins. Gain #3: 90 dB Selected curve shown above F2
Testing Protocol For Quick Testing, measure only Ins. Gain #2. This measures at average speech level (70 dB SPL) For Complete Testing, measure Ins. Gain #1, #2, and #3 (50, 70, and 90 dB SPL) If no unaided response is measured, the average is automatically substituted
Example of Insertion Gain Meas Prescription: This patient could use more amplification between Hz!
Overview for Quick Insertion Gain Testing Enter Audiogram Entry screen Press F2 from Opening Screen. Use NEXT and BACK if necessary Input audiogram and generate target Use arrow keys to enter audiogram. Press F3 to generate target. Enter Insertion Gain screen Use NEXT until screen appears Level the sound field speaker Press F5 and START Measure Ins. Gain #2 and fit to target Use F2 to select curve. Press START/STOP to start and stop test If desired, also measure Unaided response and Aided Curve #1 and #3
The Real-ear SPL Protocol Compare the Real-ear Response to HTLs and UCLs on one graph
Overview of the SPL Protocol Enter Audiogram Entry screen Press F2 from Opening Screen. Use NEXT and BACK if necessary Input audiogram and generate target Use arrow keys to enter audiogram. Press F3 to generate target. Enter Real-ear SPL screen Use NEXT until screen appears Level the sound field speaker Press F5 and START Measure Aided #1 to compare to HTLs Use F2 to select curve. Press START/STOP to start and stop test Measure Aided #2 to compare to the target Measure Aided #3 to compare to UCLs
Visible Speech Use External Signals such as Live Voice in the real-ear measurements Perform this measurement in the Real-ear SPL screen NEW! Both the real-time response and the average response are displayed
Example of Visible Speech Average Response Real-time Response
Visible Speech Protocol Enter Audiogram Entry screen Press F2 from Opening Screen. Use NEXT and BACK if necessary Input audiogram and generate target Use arrow keys to enter audiogram. Press F3 to generate target. Enter Real-ear SPL screen Use NEXT until screen appears Put analyzer in Spectrum Analysis mode Use F4 to select the source type. Use DOWN arrow to turn source OFF. Perform Visible Speech measurement Press START/STOP to start measurement. Begin speech signal.
Open Fit Hearing Aids Coupler measurements: Use our new Open Fit Coupler! Real-ear measurements: Same protocol but disable the reference microphone
Open Fit Coupler Insert the hearing aid into the coupler as you would into the ear No sealing is necessary Produces a frequency response more like a real-ear response For ANSI measurements to specifications, use HA- 1 coupler
Real-ear Measurements Some Open Fit hearing aids interfere with the reference microphone measurement outside the ear (feedback management and/or amplified signal escaping from ear) Disable the REF MIC setting in the real-ear measurement screen local menu Test as usual Expect very little amplification below 1000 Hz. Fit to target only in mid-to-high frequencies
Example of Open Fit Real-ear
Using the FONIX NOAH Module Friendly Windows-based interface Automatically use NOAH audiogram Can send NOAH audiogram to analyzer Perform real-ear and coupler measurements from computer Save all results into NOAH database On Top window: Perform real-ear while adjusting the hearing aid!