FONIX® 8000 - Frye Electronics

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166 FONIX <strong>8000</strong> Hearing Aid Analyzer In other words, the bottom graph of the insertion gain screen shows the difference between the sound field measured by the reference microphone outside of the ear and the probe microphone in the ear canal. (When the reference microphone is disabled, the estimated sound field is subtracted.) The top graph shows the insertion gain, which are the values obtained when the unaided response is subtracted from the aided response. Target Curve A, displayed in the top graph in the Real-ear Insertion Gain screen, is automatically adjusted to the source type and amplitude of the current selected curve when REAG 2-5 are selected. When REUG 1 is selected, Target Curve A uses the source settings of REAG 3. (This only applies when the NAL-NL1 fitting rule is selected. All other fitting rules on the <strong>8000</strong> are linear, which means the target does not change with respect to the source type and amplitude of the signal.) Most of the operations of the Insertion Gain screen are identical to the operations of the Real-ear SPL screen. Therefore, most of the instructions found in this section apply to measurements performed in both screens. Any differences between operations in the two screens are noted. To enter the Insertion Gain screen, press [F2] from the Opening screen to enter the Real-ear Navigation screen. Then press [F3]. Figure 8.4.1—Real-ear Insertion Gain screen. Curve 1 is an REUG (unaided) measurement. Curve 2 is an REAG (aided) measurement. Curve 6 is the REIG (insertion gain) curve. Curve A is the real-ear prescription target.
Real-Ear Measurements 167 8.4.2 Measuring in the Real-ear SPL screen In the past ten years, the SPL method of performing real-ear measurement has increased in popularity. In the SPL method, the patient’s hearing threshold levels (HTLs), uncomfortable levels (UCLs), real-ear target, and real-ear measurements are displayed together on one graph in terms of dB SPL. This allows for a direct comparison of audiometric measurements and real-ear measurements. The goal in the SPL method is to ensure the response of the hearing aid to soft signals (50 dB SPL) reach above the patient’s HTLs, the response to average signals (65-80 dB SPL) meet the target, and the response to loud signals (90 dB SPL) are below the UCLs. In the Real-ear SPL screen (Figure 8.4.2), the patient’s HTLs and UCLs are displayed on one large graph together with up to three real-ear targets and five real-ear measurements. The three targets (L, M and H) are matched to the source type and amplitude of REAR 2, REAR 3 and REAR 4 respectively. That is, Target Curve L is appropriate for the settings used in REAR 2, M is appropriate for REAR 3, and H is appropriate for REAR 4. When changing the source type or amplitude of any of these three measurement curves, the target will automatically adjust. These curves are color coded to make it easier to match the measurement curve to the appropriate target. Target L and REAR 2 are blue, Target M and REAR 3 are green, and Target H and REAR 4 are red. The long term average speech spectrum (LTASS) can also be displayed as three dotted “l”, “m” and “h” curves. The LTASS is the average real-ear unaided response. The “m” curve is the real-ear unaided response at 70 dB SPL. The “h” curve is 12 dB above this curve, and the “l” curve is 18 dB below it. The three curves of the LTASS are used as a comparison tool to the aided measurement curves to demonstrate the amplication advantage provided by the hearing aid. Use [F3] to turn this feature ON. During a typical real-ear measurement using the SPL method: 1. The probe tube AND hearing aid are inserted into the ear canal. (Section 8.2.3) 2. The sound field speaker is leveled. (Section 8.2.4) 3. The hearing aid is carefully inserted into the ear. 4. The aided response is measured (Section 8.4.4) with an input signal of 50 dB SPL and compared to the patient’s HTLs. 5. The aided response is measured with an input signal of 65 dB SPL and compared to the real-ear target. 6. The aided response is measured with an input signal of 90 dB SPL and compared to the patient’s UCLs
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Page 153 and 154: Chapter 7 145 The ISTS Test The IST
Page 155: The ISTS Test 147 No HL 250 Hz 375
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Page 207 and 208: Appendix A 199 Specifications ACOUS
Page 209: Specifications 201 Size: 11.5"W x 1
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Page 219: Calibration 211 6. Thread the probe
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Appendix G 223 Glossary of Terms AG
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Glossary of Terms for the FONIX 800
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Appendix H 229 The FONIX Keyboard A
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FONIX® 8000 - Frye Electronics

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