FONIX® FP35 Touch - Frye Electronics

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198 FONIX FP35 Hearing Aid Analyzer 9. If the SPL seems high, you might modify the vent size. Then select AIDED 2 with [F2] and, if necessary, use [] to turn off the source. Repeat steps 7 and 8. You should see a change in the RMS Output. Aided Curve 2 should be less than Aided Curve 1. 10. If desired, press [PRINT/FEED] to print the results. Note: You could also measure the effects with the hearing aid on. ApplicAtion 2: insertion gAin meAsurements using An externAl sound source. For this procedure, you choose the external sound source. You may want to use a tape or a CD player through a loudspeaker. Any sustained sound source will work. Whether you use a cocktail noise tape or one of the new, environment CDs, you should find your test results interesting, especially when testing nonlinear signal processing hearing aids. Suggested Procedure: 1. Prepare your sound source 2. Enter the IG Screen of the Real-ear Mode. 3. Do a typical UNAIDED and AIDED probe test using your external sound source by taking measurements with the internal source of the FP35 off. 8.3 Technical Details The FONIX analyzers use phase synchronous signal sources to generate sound. This means that the sound has a predetermined repeatable source, which allows FONIX analyzers to make accurate measurements and use time averaging to improve the signal to noise measurement of the analyzer. When you take spectrum measurements with the FP35, a sound source is not generated, and it is assumed that you will be measuring a non-repeating source such as speech or room noise. In most cases, these measurement results are improved with the use of a spectrum mode windowing filter. The windowing filter helps to make the signal seem like it is synchronous to the analysis routines. Unfortunately, using the windowing filter on a synchronous source signal will result in mangling the results. You can see this by placing the FP35’s measurement microphone in another analyzer’s chamber along side that analyzer’s own microphone. The results will not look the same on the two analyzers. The way to resolve this is to turn off the spectrum windowing filter. You can only do this in Coupler Multicurve and Target Coupler screens. Synopsis: If you are doing a spectrum analysis of speech or room noise, leave the WINDOWING setting set to AUTO in the custom menu of the Coupler Multicurve or the Target Coupler screen.
Spectrum Analysis 199 If you are doing a spectrum analysis of a phase synchronous signal such as the source of a different analyzer, change the WINDOWING setting to FRYE in that menu. This will adjust the measurement for a test box-like signal while in spectrum analysis mode. Note: The WINDOWING setting is only available when the USER LEVEL mode is set to ADVANCED in the Advanced Default Settings Menu. See Section 2.3.2.
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Chapter 5 117 Real-Ear Measurements
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Real-Ear Measurements 119 Note: If
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Real-Ear Measurements 121 5.2.4 Pla
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Real-Ear Measurements 123 The clien
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Real-Ear Measurements 125 5.3.1 Ent
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Real-Ear Measurements 127 An altern
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Real-Ear Measurements 129 5. Press
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Real-Ear Measurements 131 Choose OU
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Real-Ear Measurements 133 Follow th
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Real-Ear Measurements 135 5.3.9 Sta
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Real-Ear Measurements 137 CHANNELS
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Real-Ear Measurements 139 Figure 5.
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Real-Ear Measurements 141 4. Use th
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Real-Ear Measurements 143 5.4.4 Aut
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Real-Ear Measurements 145 Figure 5.
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Page 161 and 162: Real-Ear Measurements 153 • When
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Page 169 and 170: Real-Ear Measurements 161 5.7.3.2 T
Page 171 and 172: Real-Ear Measurements 163 1. Press
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Page 179 and 180: Real-Ear Measurements 171 FILTER—
Page 181 and 182: Real-Ear Measurements 173 5.9.1 - M
Page 183 and 184: Real-Ear Measurements 175 The diffe
Page 185 and 186: Chapter 6 177 2-CC Targets The 2-cc
Page 187 and 188: Target Coupler 179 Target menu from
Page 189 and 190: Target Coupler 181 6.2.2 Viewing th
Page 191 and 192: Target Coupler 183 Figure 6.2.3A: F
Page 193 and 194: Target Coupler 185 To view the targ
Page 195 and 196: Target Coupler 187 AID TYPE—Style
Page 197 and 198: Target Coupler 189 Custom Menu Pres
Page 199 and 200: Chapter 7 191 The Audiometer Option
Page 201 and 202: The Audiometer Option 193 including
Page 203: The Audiometer Option 195 Set up th
Page 209 and 210: Appendix A 201 Specifications Acous
Page 211: Specifications 203 Environmental Co
Page 214 and 215: 206 FONIX FP35 Hearing Aid Analyzer
Page 219 and 220: Appendix C 211 Calibration The FP35
Page 221 and 222: Calibration 213 1. Press [MENU] fro
Page 223 and 224: Calibration 215 Figure C-3A—Attac
Page 225 and 226: Calibration 217 To perform the micr
Page 227 and 228: Calibration 219 C.3 Calibrating the
Page 229 and 230: Calibration 221 5. If you are using
Page 231 and 232: Appendix D 223 Fitting Formula Tabl
Page 233: Fitting Formula Tables 225 1/3, 1/2
Page 239 and 240: Appendix F 231 Digital Speech Techn
Page 241 and 242: Index 233 Index A Accessories 6-11
Page 243 and 244: Index 235 M Maintenance 17 Medical
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FONIX® FP35 Touch - Frye Electronics

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