Audioscan Verifit 2 Bedienungsanleitung Seite 51
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Verifit
®
User's Guide Version 4.2 © June 2015
It is suggested that hearing instruments be preset in Test box mode with fine tuning done in On-ear mode.
Note that On-ear mode should be used for vented or open fittings. Vent effects depend on the vent, the ear and
the hearing aid settings and cannot be reliably predicted from coupler measurements.
SII calculation in Speechmap
The Verifit calculates a Speech Intelligibility Index (SII) value (in %) for unaided speech at 65 dB SPL and for
each aided test. The calculations use the 1/3 octave band method of ANSI S3.5 –1997 without the 160 Hz band
and without masking effects with results expressed as a % by multiplying by 100. Level distortion effects are
included but no hearing loss desensitization is applied. An idealized speech region of LTASS +/- 15 dB is used.
The speech recognition associated with a given SII is a function of the test material and the cognitive abilities of
the listener. There is considerable individual variability in relating the SII to speech recognition, especially
amongst impaired listeners. The following shows expected nominal recognition scores vs SII for normals when
using a variety of speech stimulus conditions. (Killion and Mueller, Hearing Journal, January, 2010 pp 10-15).
Using custom stimuli in Speechmap
Custom digital sound files can be used as stimuli in Speechmap. If you connect a USB stick with WAV files on
it to the Verifit, Speechmap will make those files available as stimulus selections. This feature provides the
freedom of using any stimulus in Speechmap with all the features that Speechmap offers. Please note that fitting
targets are not available for custom stimuli.
A USB stick is required for this feature. It is highly recommended that the USB stick is formatted for data using
the Audioscan Updater prior to using this feature. The Audioscan Updater comes with any current Audioscan
software download or CD. Visit www.audioscan.com to obtain software updates.
To use digital sound files as stimuli in Speechmap:
1. Connect a USB stick to your PC.
51
- Audioscan Verifit 1
- User's Guide 4.2 1
- Table of Contents 2
- 1 About Verifit 6
- 47 – 63 Hz 1.35 – 0.53 A 7
- Component Description 9
- Audioscan update USB stick 9
- Quickstart setup guide 9
- Test Box 10
- Accessories 12
- SAFETY WARNINGS and NOTICES 13
- Environmental safety 14
- Electronic User’s Guide 18
- 2 Getting Started 20
- Microphone connection 21
- General care instructions 23
- Microphone care 24
- Mouse and keyboard 24
- Monitor headphones 24
- External peripherals 26
- 3 General Operation 28
- Network connection 30
- Menus, lists and buttons 32
- Screen messages and Help 32
- Software updating 32
- 4 General Setup 34
- 5 On-Ear Measures - Setup 36
- On-ear calibration facts 37
- Max TM SPL setup 40
- ABR nHL to eHL setup 40
- Positioning the client 40
- Positioning the probe tube 41
- 42
- On-ear single or dual view 43
- SPL or HL scale 43
- Hide or show on-ear curves 43
- 7 Speechmap 45
- NAL-NL1 in Speechmap 46
- NAL-NL2 in Speechmap 46
- Camfit in Speechmap 47
- Using Speechmap 47
- Speechmap Setup 47
- Screen tour - aided screen 50
- On-ear or Test box mode 50
- Speechmap screen choices 55
- Data entry 57
- Open fittings in Speechmap 60
- CROS fitting in Speechmap 63
- FM fitting and verification 66
- Speechmap stimuli 68
- Stimulus spectra 69
- Microphone location effects 70
- Deep insertion compensation 70
- Speech signal analysis 71
- On-ear directional testing 72
- On-ear feedback test 73
- On-ear noise reduction test 73
- On-ear manual control 74
- 11 WRECD measurement 76
- WRECD protocols 78
- WRECD results 78
- WRECD facts 80
- 12 Occlusion Effect Test 81
- 13 Sensory loss simulator 82
- 14 Insertion Gain 84
- Insertion gain in HL 85
- Audiometric data entry 86
- REUR measurement procedure 87
- REAR measurement procedure 88
- 15 Test Box Measures - Setup 91
- Format 93
- ANSI test frequencies 94
- Test box calibration facts 95
- Coupling for ANSI tests 98
- 16 ANSI Hearing Aid Tests 101
- ANSI test results 102
- ANSI input-output curves 102
- ANSI telecoil terminology 103
- ANSI test loop test 104
- Telecoil test results 106
- 17 Other Test Box Measures 107
- Directional function test 108
- Directional ITE positioning 108
- Directional BTE positioning 109
- Multicurve procedure 111
- Multicurve results 111
- Battery drain test 112
- Manual control procedure 113
- 18 Networking 116
- Remote Operation 118
- NOAH Service Port 119
- Testing the NOAH service port 120
- Web Service Port 120
- Static connection 122
- Storing data in NOAH 124
- Printing results 124
- Printing setup 124
- Printer connection 125
- Printer types 126
- HP printer 126
- Custom printer 126
- File output 127
- Page setup 127
- Network printer 131
- Web browser screen capture 131
- Session setup 132
- 21 Troubleshooting 135
- Test box speaker overdriven 137
- Invalid on-ear calibration 138
- Invalid binaural equalization 139
- 22 Technical Specifications 140
- Sensory Loss Simulator 144
- June 2015 145
- 23 Glossary 147
- 24 References 152
- 25 Appendix 1 155
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