HP RM500SL manual Example of speech envelope and Ltass

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128 ms analysis time period as an approximation because it also has considerable historic support.

Because the spectrum of a speech signal varies with time, it is necessary to average measurements over several seconds to obtain a stable, repeatable result. However, the effects of adjustments to hearing aid parameters need to be seen quickly in order to be useful for optimization. To resolve these conflicting needs, speech signals are first presented in a repeating loop with a sound-field equalization test prior to the start of each passage. A running calculation of the short-term speech envelope and average is performed on 2 - 3 seconds worth of data and is displayed in real time so that the effects of adjustments to hearing aid parameters are easily viewed. Pressing the Continue key causes the passage to restart and run in its entirety. The envelope and average are calculated over the full passage to provide stable and repeatable data.

When using live speech as a test signal, a “Freeze curve” function is available to capture the short-term spectra for examination and counseling purposes.

Figure 7: Example of speech envelope and LTASS

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Contents USER’S Guide Table of Contents General SetupGetting Started General OperationHearing Instrument Tests Setup Ansi S3.22 Hearing Aid TestsOther Hearing Instrument Tests REM Manual Control Speechmap Fitting Procedures TroubleshootingSpeechmap Technical Details About RM500SL Section overviewHelp is available on the following topics by pressing Help FastFacts 1.3 Electronic users guide Warranty, Trademarks, Acknowledgements FastFacts 1.4 Warranty, trademarks, acknowledgementsElectromagnetic Compatability EMC CisprFastFacts 2.1 Getting started Unpacking and connecting FastFacts 2.2 Unpacking and connectingGetting Started Following topics are covered in this sectionMicrophone connection FastFacts 2.3 Microphone connectionFastFacts 2.4 Microphone care Battery pill use and care FastFacts 2.5 Battery pill use and careMicrophone care Coupler microphone Probe microphoneMouse, keyboard, barcode scanner FastFacts 2.6 Mouse, keyboard, barcode scannerGeneral Operation External printer, auxiliary audio outputsFastFacts 2.7 External printer, auxiliary audio outputs Section overview This section covers the following topicsInput device operation Function KeypadFastFacts 3.2 Input device operation Barcode data input FastFacts 3.3 Barcode data inputKeypad keys Function Button FastFacts 3.4 Keypad keysMenus, lists and buttons Setup Box List Box FastFacts 3.5 Menus, lists and buttonsFastFacts 3.7 Program memory removal and replacement Screen messagesGeneral Setup FastFacts 4.1 General setup Date and time setupFastFacts 4.2 Date and time setup Software updatingDisplay settings FastFacts 4.3 Display settings Saving test setupFastFacts 4.4 Saving test setup Networking FastFacts 5.1 Networking Networking requirementsFastFacts 5.2 Networking requirements Networking setup FastFacts 5.3 Networking setupSingle computer connection On the RM500SL, seeFastFacts 5.4 Single computer connection Printing and Storing Results FastFacts 6.1 Printing and storing resultsInternal printer paper loading To load a new roll of paperFastFacts 6.2 Internal printer paper loading FastFacts 6.4 Local printer setup Barcodes, headers and comments on printoutsPrinting to a USB memory stick FastFacts 6.5 Printing to a USB memory stickNetwork printer setup FastFacts 6.6 Network printer setupPrinting to a network file FastFacts 6.8 Data storage to a network fileHearing Instrument Tests Setup FastFacts 7.2 HIT a or B display Graph or table formatFastFacts 7.3 Graph or table format Output or gain scale FastFacts 7.4 Output or gain scaleHide or Show HIT curves To change the averaging frequenciesFastFacts 7.7 Ansi test frequencies HIT calibration facts FastFacts 7.8 HIT calibration factsFastFacts 7.9 Calibration of HIT reference microphone Calibration check for coupler microphone FastFacts 7.10 Calibration check for coupler microphoneCoupling the hearing instrument Positioning the hearing instrument FastFacts 7.12 Positioning the hearing instrumentAnsi S3.22 Hearing Aid Tests FastFacts 8.2 Ansi S3.22-1996 factsAnsi S3.22-2003 facts Turn the instrument onFastFacts 8.4 Ansi 1996 Linear and AGC tests Ansi 2003 Linear and AGC tests FastFacts 8.5 Ansi 2003 Linear and AGC testsAnsi test results FastFacts 8.6 Ansi test resultsAnsi input-output curves FastFacts 8.7 Ansi input-output curvesAnsi telecoil terminology FastFacts 8.8 Ansi telecoil terminologyAnsi telephone simulator Tmfs test FastFacts 8.9 Ansi telephone simulator Tmfs testTelecoil test results FastFacts 8.10 Telecoil test resultsOther Hearing Instrument Tests Turn the hearing instrument onFastFacts 9.2 Harmonic distortion Multicurve procedure FastFacts 9.3 Multicurve procedure Multicurve resultsFastFacts 9.4 Multicurve results FastFacts 9.6 Battery drain test Spectral analysis in MulticurveManual control procedure FastFacts 9.8 Sound level meter using manual controlReal-Ear Measurement Setup FastFacts 10.2 REM calibration factsCalibration of REM probe microphone FastFacts 10.3 Calibration of REM probe microphoneCalibration check for probe module Max TM SPL setup FastFacts 10.5 Max TM SPL setup 10.6 ABR nHL to eHL setupFastFacts 10.6 ABR nHL to eHL setup Positioning the client FastFacts 10.8 Positioning the probe tubeREM Screen Setup FastFacts 11.3 Graph, table or 2cc target formatREM Manual Control SPL or HL scaleFastFacts 11.4 SPL or HL scale Hide or show REM curves FastFacts 11.5 Hide or show REM curvesFastFacts 12.3 Sound level meter using REM probe Manual control measurementsSensory Loss Simulator Sensory loss simulator descriptionFastFacts 13.2 Sensory loss simulator operation Occlusion Effect Test Occlussion effect measurementTurn the hearing aid OFF FastFacts 14.1 Occlusion effect measurementRecd real-ear to coupler difference FastFacts 15.2 Recd factsRecd coupler response FastFacts 15.3 Recd coupler responseRecd real-ear response Allow the foam tip to fully expand in the earFastFacts 15.4 Recd real-ear response Recd results FastFacts 15.5 Recd resultsInsertion Gain FastFacts 16.1 Insertion gain Insertion gain in SPLFastFacts 16.2 Insertion gain in SPL Insertion gain in HL FastFacts 16.3 Insertion gain in HLAudiometric data entry To enter data from a barcode see 3.3 Barcode data inputTo enter assessment data and parameters manually FastFacts 16.4 Audiometric data entryReur measurement procedure FastFacts 16.5 Reur measurement procedureRear measurement procedure FastFacts 16.6 Rear measurement procedureSII calculation in Insertion gain FastFacts 16.7 SII calculation in Insertion gainSpeechmap FastFacts 17.1 Speechmap 17.2 Speechmap factsFastFacts 17.2 Speechmap facts DSL 5.0 in Speechmap FastFacts 17.3 DSL 5.0 in SpeechmapDSL 5.0 changes FastFacts 17.4 DSL 5.0 changes NAL-NL1 in SpeechmapFastFacts 17.5 NAL-NL1 in Speechmap Using Speechmap FastFacts 17.6 Using SpeechmapTo enter audiometric data, see 18.2 Assessment data entry 0611 RM500SL User’s Guide Version REM or S-REM mode FastFacts 17.9 REM or S-REM mode17.10SII calculation in Speechmap FastFacts 17.10 SII calculation in SpeechmapSpeechmap Fitting Procedures To enter assessment data manuallyFastFacts 18.2 Assessment data entry Assessment data choices FastFacts 18.3 Assessment data choicesFrom 18.3 Assessment data choices FastFacts 18.4 Assessment data choicesFitting to targets for soft speech FastFacts 18.5 Fitting to targets for soft speechFitting to targets for loud sounds FastFacts 18.6 Fitting to targets for loud soundsFitting to targets for mid-level speech FastFacts 18.8 Open fittings in SpeechmapFM fitting and verification FastFacts 18.9 FM fitting and verificationSpeechmap Technical Details FastFacts 19.2 Speechmap stimuliStimulus levels FastFacts 19.3 Stimulus levelsMicrophone location effects Microphone Location Effects FastFacts 19.4 Microphone location effectsSpeech signal analysis FastFacts 19.5 Speech signal analysisTroubleshooting FastFacts 20.1 Troubleshooting Self test failuresFastFacts 20.2 Self test failures FastFacts 20.4 HIT curves inconsistent No HIT reference mic. detected FastFacts 20.7 No HIT reference mic. detectedInvalid HIT calibration Invalid HIT Calibration FastFacts 20.10 Invalid REM calibration20.11REM speaker overdriven FastFacts 20.12 Barcode scanner malfunctionTechnical Specifications Storage & TransportationGeneral HIT ChamberGlossary Page Page Page References Page Page 0611 RM500SL User’s Guide Version Verifit and RM500SL Test Signals and Analysis Test signalsIntroduction Broad-band signals Loud Vocal Effort Effect re nominal band SPL Analysis of broad-band signals Pink noise signal analysisVerifit / 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