HP RM500SL manual FastFacts 17.3 DSL 5.0 in Speechmap

Page 71

17.3 DSL 5.0 in Speechmap

The Desired Sensation Level (DSL) method is a systematic eardrum sound pressure level (SPLogram) approach to hearing instrument fitting that seeks to ensure amplified speech will be audible and comfortable while loud sounds will not be uncomfortable. It takes into account individual acoustic factors in audiometric and electroacoustic data. DSL was developed by the National Centre for Audiology (NCA), London, Ontario. Audioscan has implemented DSL within its Speechmap fitting system since 1994.

In 2005, DSL underwent an extensive revision. This has resulted in changes to speech targets for children. These changes will be more significant when the individual RECD values have not been measured for the child being fitted. See 17.4:DSL 5.0 changes and www.audioscan.com for details of the changes.

The Audioscan version of DSL 5.0 may differ from others in the following ways:

1)DSL 5.0 uses RECD values for ages > 119 months from a different source than for ages ≤ 119 months; Audioscan has used the RECD values for a 119 month old for ages > 119 months so all values come from the same study.

2)Input-output curve targets and compression threshold targets are not provided. Such steady-state parameters are of little value in estimating amplified speech levels. Matching amplified speech to the LTASS targets at levels from 50 to 75 dB SPL provides much better assurance that fitting goals are being met.

3)There is no provision to input the number of compression channels. This may be useful when the signal used for verification is not the signal for which the targets were developed. It is irrelevant when using real-speech signals to match speech targets and when using narrow-band signals to match narrow-band maximum output targets.

4)The term Uncomfortable Level (UCL) is used rather than Upper Limit of Comfort (ULC) in referring to the ear canal SPL that should never be exceeded.

5)Broadband output limiting targets are not provided.

FastFacts 17.3: DSL 5.0 in Speechmap

0611

RM500SL User’s Guide Version 2.8

Page 71

Image 71

Contents USER’S Guide General Operation Table of ContentsGeneral Setup Getting StartedOther Hearing Instrument Tests Hearing Instrument Tests SetupAnsi S3.22 Hearing Aid Tests REM Manual Control Speechmap Technical Details Speechmap Fitting ProceduresTroubleshooting Help is available on the following topics by pressing Help About RM500SLSection overview FastFacts 1.3 Electronic users guide FastFacts 1.4 Warranty, trademarks, acknowledgements Warranty, Trademarks, AcknowledgementsCispr Electromagnetic Compatability EMCFollowing topics are covered in this section FastFacts 2.1 Getting started Unpacking and connectingFastFacts 2.2 Unpacking and connecting Getting StartedFastFacts 2.3 Microphone connection Microphone connectionProbe microphone FastFacts 2.4 Microphone care Battery pill use and careFastFacts 2.5 Battery pill use and care Microphone care Coupler microphoneFastFacts 2.6 Mouse, keyboard, barcode scanner Mouse, keyboard, barcode scannerSection overview This section covers the following topics General OperationExternal printer, auxiliary audio outputs FastFacts 2.7 External printer, auxiliary audio outputsFastFacts 3.2 Input device operation Input device operationFunction Keypad FastFacts 3.3 Barcode data input Barcode data inputFastFacts 3.4 Keypad keys Keypad keys Function ButtonFastFacts 3.5 Menus, lists and buttons Menus, lists and buttons Setup Box List BoxScreen messages FastFacts 3.7 Program memory removal and replacementSoftware updating General SetupFastFacts 4.1 General setup Date and time setup FastFacts 4.2 Date and time setupFastFacts 4.4 Saving test setup Display settingsFastFacts 4.3 Display settings Saving test setup FastFacts 5.2 Networking requirements NetworkingFastFacts 5.1 Networking Networking requirements FastFacts 5.3 Networking setup Networking setupFastFacts 5.4 Single computer connection Single computer connectionOn the RM500SL, see FastFacts 6.1 Printing and storing results Printing and Storing ResultsFastFacts 6.2 Internal printer paper loading Internal printer paper loadingTo load a new roll of paper Barcodes, headers and comments on printouts FastFacts 6.4 Local printer setupFastFacts 6.5 Printing to a USB memory stick Printing to a USB memory stickFastFacts 6.6 Network printer setup Network printer setupFastFacts 6.8 Data storage to a network file Printing to a network fileFastFacts 7.4 Output or gain scale Hearing Instrument Tests SetupFastFacts 7.2 HIT a or B display Graph or table format FastFacts 7.3 Graph or table format Output or gain scaleFastFacts 7.7 Ansi test frequencies Hide or Show HIT curvesTo change the averaging frequencies FastFacts 7.8 HIT calibration facts HIT calibration factsFastFacts 7.9 Calibration of HIT reference microphone FastFacts 7.10 Calibration check for coupler microphone Calibration check for coupler microphoneCoupling the hearing instrument FastFacts 7.12 Positioning the hearing instrument Positioning the hearing instrumentFastFacts 8.2 Ansi S3.22-1996 facts Ansi S3.22 Hearing Aid TestsFastFacts 8.4 Ansi 1996 Linear and AGC tests Ansi S3.22-2003 factsTurn the instrument on FastFacts 8.5 Ansi 2003 Linear and AGC tests Ansi 2003 Linear and AGC testsFastFacts 8.6 Ansi test results Ansi test resultsFastFacts 8.7 Ansi input-output curves Ansi input-output curvesFastFacts 8.8 Ansi telecoil terminology Ansi telecoil terminologyFastFacts 8.9 Ansi telephone simulator Tmfs test Ansi telephone simulator Tmfs testFastFacts 8.10 Telecoil test results Telecoil test resultsFastFacts 9.2 Harmonic distortion Other Hearing Instrument TestsTurn the hearing instrument on FastFacts 9.4 Multicurve results Multicurve procedureFastFacts 9.3 Multicurve procedure Multicurve results Spectral analysis in Multicurve FastFacts 9.6 Battery drain testFastFacts 9.8 Sound level meter using manual control Manual control procedureFastFacts 10.2 REM calibration facts Real-Ear Measurement SetupFastFacts 10.3 Calibration of REM probe microphone Calibration of REM probe microphoneCalibration check for probe module FastFacts 10.6 ABR nHL to eHL setup Max TM SPL setupFastFacts 10.5 Max TM SPL setup 10.6 ABR nHL to eHL setup FastFacts 10.8 Positioning the probe tube Positioning the clientFastFacts 11.3 Graph, table or 2cc target format REM Screen SetupFastFacts 11.5 Hide or show REM curves REM Manual ControlSPL or HL scale FastFacts 11.4 SPL or HL scale Hide or show REM curvesManual control measurements FastFacts 12.3 Sound level meter using REM probeFastFacts 13.2 Sensory loss simulator operation Sensory Loss SimulatorSensory loss simulator description FastFacts 14.1 Occlusion effect measurement Occlusion Effect TestOcclussion effect measurement Turn the hearing aid OFFFastFacts 15.2 Recd facts Recd real-ear to coupler differenceFastFacts 15.3 Recd coupler response Recd coupler responseFastFacts 15.4 Recd real-ear response Recd real-ear responseAllow the foam tip to fully expand in the ear FastFacts 15.5 Recd results Recd resultsFastFacts 16.2 Insertion gain in SPL Insertion GainFastFacts 16.1 Insertion gain Insertion gain in SPL FastFacts 16.3 Insertion gain in HL Insertion gain in HLFastFacts 16.4 Audiometric data entry Audiometric data entryTo enter data from a barcode see 3.3 Barcode data input To enter assessment data and parameters manuallyFastFacts 16.5 Reur measurement procedure Reur measurement procedureFastFacts 16.6 Rear measurement procedure Rear measurement procedureFastFacts 16.7 SII calculation in Insertion gain SII calculation in Insertion gainFastFacts 17.2 Speechmap facts SpeechmapFastFacts 17.1 Speechmap 17.2 Speechmap facts FastFacts 17.3 DSL 5.0 in Speechmap DSL 5.0 in SpeechmapFastFacts 17.5 NAL-NL1 in Speechmap DSL 5.0 changesFastFacts 17.4 DSL 5.0 changes NAL-NL1 in Speechmap To enter audiometric data, see 18.2 Assessment data entry Using SpeechmapFastFacts 17.6 Using Speechmap 0611 RM500SL User’s Guide Version FastFacts 17.9 REM or S-REM mode REM or S-REM modeFastFacts 17.10 SII calculation in Speechmap 17.10SII calculation in SpeechmapFastFacts 18.2 Assessment data entry Speechmap Fitting ProceduresTo enter assessment data manually FastFacts 18.3 Assessment data choices Assessment data choicesFastFacts 18.4 Assessment data choices From 18.3 Assessment data choicesFastFacts 18.5 Fitting to targets for soft speech Fitting to targets for soft speechFastFacts 18.6 Fitting to targets for loud sounds Fitting to targets for loud soundsFastFacts 18.8 Open fittings in Speechmap Fitting to targets for mid-level speechFastFacts 18.9 FM fitting and verification FM fitting and verificationFastFacts 19.2 Speechmap stimuli Speechmap Technical DetailsFastFacts 19.3 Stimulus levels Stimulus levelsFastFacts 19.4 Microphone location effects Microphone location effects Microphone Location EffectsFastFacts 19.5 Speech signal analysis Speech signal analysisFastFacts 20.2 Self test failures TroubleshootingFastFacts 20.1 Troubleshooting Self test failures FastFacts 20.4 HIT curves inconsistent FastFacts 20.7 No HIT reference mic. detected No HIT reference mic. detectedFastFacts 20.10 Invalid REM calibration Invalid HIT calibration Invalid HIT CalibrationFastFacts 20.12 Barcode scanner malfunction 20.11REM speaker overdrivenHIT Chamber Technical SpecificationsStorage & Transportation GeneralGlossary Page Page Page References Page Page 0611 RM500SL User’s Guide Version Introduction Verifit and RM500SL Test Signals and AnalysisTest signals Broad-band signals Loud Vocal Effort Effect re nominal band SPL Pink noise signal analysis Analysis of broad-band signalsVerifit / RM500SL Speechmap 07/05/06 Example of speech envelope and Ltass 07/05/06 Ltass for Speechmap speech signals at average vocal effort Ltass Dynamic