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audioscan axiom User Manual

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Axiom
User's Guide Version 1.6
© August 2013

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  • Page 1 ® Axiom User's Guide Version 1.6 © August 2013...

  • Page 2: Table Of Contents

    Table of Contents 1 About Axiom..................................5 New in this software release..............................5 Product description................................5 Associated items and supplies..............................5 SAFETY WARNINGS and NOTICES..........................6 Environmental safety................................6 Declaration of Electromagnetic Compatibility (EMC).......................6 Warranty, Trademarks, Acknowledgments.........................7 EC Declaration of Conformity.............................9 Electronic User’s Guide..............................10 How to Avoid Undesirable Side Effects..........................10 2 Getting Started..................................12...
  • Page 3 User's Guide Version 1.6 © August 2013 ® Axiom Positioning the hearing instrument............................40 9 ANSI Hearing Aid Tests..............................41 ANSI S3.22-1996 facts...............................41 ANSI S3.22-2003 facts...............................41 ANSI 1996 Linear and AGC tests............................42 ANSI 2003 Linear and AGC tests............................42 ANSI test results.................................43 10 Other Test Box Measures..............................44 Multicurve procedure.................................44...
  • Page 4 User's Guide Version 1.6 © August 2013 ® Axiom Screen tour - aided screen..............................74 On-ear or Test box mode..............................74 SII calculation in Speechmap.............................75 Using Custom Stimuli in Speechmap..........................75 Creating WAV Files for Speechmap..........................77 18 Speechmap Fitting Procedures............................79 Speechmap screen choices..............................79 Data entry...................................80...

  • Page 5: About Axiom

    2. Wireless Networking. For details see 5. Networking. Product description The Axiom is a hearing aid analyzer intended to be used by hearing care professionals such as audiologists and hearing aid specialists to verify the electro-acoustic performance of a hearing aid connected to a standard earphone coupler or while worn on the ear of the end user.

  • Page 6: Safety Warnings And Notices

    User's Guide Version 1.6 © August 2013 ® Axiom SAFETY WARNINGS and NOTICES For purposes of IEC 60601-1, this product is Class I with Type BF applied part. This device complies with Part 15 of the FCC Rules. Operation is subject to the following two conditions:...

  • Page 7: Warranty, Trademarks, Acknowledgments

    User's Guide Version 1.6 © August 2013 ® Axiom The Axiom should not be used adjacent to or stacked on other equipment. If this is necessary, its operation • should be verified as normal in this configuration. Portable and mobile RF communications equipment can affect medical electrical equipment and may affect •...
  • Page 8 User's Guide Version 1.6 © August 2013 ® Axiom registered trademark of Hewlett-Packard Company. NOAH is a registered trademark of the Hearing Instrument Manufacturer's Software Association. QUEST is a trademark of Quest Technologies Inc. PostScript is a registered trademark of Adobe Systems, Inc.

  • Page 9: Ec Declaration Of Conformity

    User's Guide Version 1.6 © August 2013 ® Axiom EC Declaration of Conformity...

  • Page 10: Electronic User's Guide

    (usually E or F). 3. Double click the User_Guide folder to open it. 4. Double click the english folder and copy the Axiom Users Guide.pdf file to an appropriate location on your PC. Double click on the file to open it for viewing.
  • Page 11 In order to ensure that all of the safety features work optimally you must ensure that the power cord is plugged into a grounded outlet. Any line-powered peripherals connected to the Axiom must comply with UL/IEC 60601-1 OR comply with UL or IEC or ISO safety standards for such equipment, AND a) be operated from an isolating transformer complying with UL/IEC 60601-1, OR b) be kept at least 6 feet (1.8m)

  • Page 12: Getting Started

    2. Locate the Axiom on a solid surface in a quiet room and choose a location for the speaker and the client such that they will be about 2' (0.6 m) apart and both at least 4' (1.2 m) from any reflective surface. If the speaker is to be mounted on a desk, it should be at the edge facing outward.
  • Page 13 User's Guide Version 1.6 © August 2013 ® Axiom 6. Plug the reference microphone and coupler microphone in to their respective connectors in the test chamber. 7. Connect the speaker to the speaker connector on the rear connector panel. 8. Connect a video monitor (HDMI or DVI with adapter) to the PRIMARY MONITOR connector on the rear...

  • Page 14: General Care Instructions

    4. Power cycle TV if video isn’t displayed 5. If video does not appear on either TV, first try power cycling the TV, then try re-booting the Axiom. Failure to follow operating instructions could place the user or operator at risk.

  • Page 15: Microphone Care

    2. DO NOT attempt to open or repair the probe microphone. Attempting to repair the probe module may lead to damage or alteration of the factory calibration. 3. DO keep the probe module and probe tubes in a clean area. 4. DO stow the probe module when not in use or when transporting the Axiom.

  • Page 16: General Operation

    3 General Operation This section describes the use of a mouse or QWERTY keyboard to control the Axiom and to enter data, and the use of the (optional) barcode scanner to enter data from printouts produced by Audioscan analyzers. It also provides instructions for updating the Axiom operating software.

  • Page 17: Barcode Data Input

    Barcode data input In Speechmap and Insertion gain tests, audiometric data in barcode form on an Audioscan analyzer printout may be entered by scanning the appropriate barcode. In Speechmap, air and bone threshold, UCL, RECD, audiometric transducer and age are encoded. In Insertion gain, threshold and audiometric transducer type are encoded.

  • Page 18: Screen Messages And Help

    The software currently running on your Axiom is stored in internal memory. A USB flash drive was shipped with your Axiom. It will be required to transfer future software updates from a PC to the Axiom. STORE IT IN A SAFE PLACE. You may download the latest software from www.audioscan.com or request that a CD-ROM be mailed to you.

  • Page 19: General Setup

    User's Guide Version 1.6 © August 2013 ® Axiom 4 General Setup This section covers Date and Time setup, Display settings (including mouse pointer speed setting) and Saving test setup. Date and time setup To set the date and time that appears on printouts and calibration screens: 1.
  • Page 20 User's Guide Version 1.6 © August 2013 ® Axiom 2. Left click on [Save option] on the Setup menu. 3. Left click on the Yes/No windows to enable/disable the save options indicated. 4. To exit the Setup menu, left click on...

  • Page 21: Networking

    PC. Images and underlying data may also be saved to a shared folder on a networked PC. See Printing and Storing Results for details. The Axiom may also be connected to a single computer using a network router, switch or hub.
  • Page 22 4. Connecting to a wireless (WLAN) network 1. Select the “Wireless” option from the “Network” drop down. 2. The Axiom will scan for wireless networks. 3. Once the scan is complete the “Name (SSID)” drop down will be populated. Select the appropriate wireless network, if your network is not visible you may type the name into this box as well.

  • Page 23: Remote Operation

    Note for network administrators: To manually change networking settings, uncheck Auto (DHCP) and [Change] button will be come active, click the [Change] button to set the network information statically. Remote Operation Check Networking requirements and connect the Axiom to your network. 1. Click and then choose [Network] from the Setup menu.

  • Page 24: Changing The Remote Operation Port

    The Audioscan Remote Operation application communicates with the Axiom through the Remote Operation network service. The Axiom provides the Remote Operation service on a TCP port. The Windows computer running the module must be configured to access the same TCP port, which is 5900 by default. Some Windows anti-virus software packages and some network firewalls prevent access to specific ports, including 5900.

  • Page 25: Changing The Noah Service Port

    The Axiom provides the NOAH service using the HTTP protocol. Communication between the Windows PC and the Axiom can be tested using an ordinary web browser. 1. On the Windows PC, enter the Axiom network address and port number into a web browser following this example:...
  • Page 26 User's Guide Version 1.6 © August 2013 ® Axiom 2. If the communication is successful, the web browser will display NOAH data formatted in XML: <noah> Example XML </noah>...

  • Page 27: Single Computer Connection

    Axiom and PC. 1. Connect a Cat 5, RJ-45 cable from one port on the switch or hub to the Axiom network connector. 2. Connect a second cable from a switch/hub port to the network connector on the PC.
  • Page 28 User's Guide Version 1.6 © August 2013 ® Axiom...

  • Page 29: Printing And Storing Results

    Windows-shared folder on a networked PC for further analysis or to be restored to an Axiom or other Audioscan analyzer. NOTE: If a header, comment, or client ID field, or file name, identifies the printed or saved data as belonging to an individual, it becomes Individually Identifiable Health Information and must be protected under the HIPAA Security Rule.

  • Page 30: Local Printer Setup

    7. Click to exit the Setup menu. Printing to USB memory 1. Plug a USB memory stick into one of the USB ports. The Axiom may be either on or off. 2. Click then click [Printing]. 3. Click [Print to USB file].

  • Page 31: Network Printer Setup

    Check [Black only] for black printouts on a color printer. 5. Connect a computer keyboard to a USB port on the Axiom and fill in the boxes with the requested information. Click each box to open it for data entry and again to close it (or use the Enter key on the keyboard’s number pad).

  • Page 32: Storing And Restoring Data - Setup

    The Axiom database may be stored and restored via xml files on a USB drive or a networked PC share. If the data exchange location is a network share, you must first enable networking. See Networking. You must also "share"...

  • Page 33: Storing And Restoring Data

    Storing and restoring data The Axiom database contains all the test and setup data for the Axiom at any point in time. The Session store features saves this database in xml format which may be viewed with a web browser or imported into an Excel spreadsheet or returned to the Axiom to recreate the session.

  • Page 34: Data Storage Using Noah

    6. Click the Session list button to generate a list of previously stored sessions for the indicated Client ID. 7. Click a session. 8. Click to load the session data. Data storage using NOAH Audioscan offers a module for storing data in the NOAH framework on a Windows PC. Contact Audioscan or visit www.audioscan.com for details.

  • Page 35: Test Box Measures - Setup

    User's Guide Version 1.6 © August 2013 ® Axiom 8 Test Box Measures - Setup For linear and AGC tests, two completely separate sets of test results, labeled A and B, may be retained and displayed. To switch between A and B test results, click on .

  • Page 36: Scale

    User's Guide Version 1.6 © August 2013 ® Axiom Scale Test results are in SPL (dB) on all screens. Hide or Show test box curves To hide or show test curve(s): On the Speechmap screen: 1. Click on the Hide/Show buttons located just below each of the Test identifier numbers as shown below.

  • Page 37: Test Box Calibration Facts

    User's Guide Version 1.6 © August 2013 ® Axiom 2. Highlight the desired HFA/SPA test frequencies and Click on it to select. To change the frequencies for attack and release time measurements: In the list of available frequencies, click on the frequencies to be used to measure attack and release time.

  • Page 38: Calibrating Test Box Reference Microphone

    User's Guide Version 1.6 © August 2013 ® Axiom Calibrating test box reference microphone Remove any coupler from the coupler microphone before calibration. 1. Position the test box reference microphone opening concentric with the coupler microphone opening and about 1 – 2 mm from as shown below.

  • Page 39: Coupling The Hearing Instrument

    Coupling the hearing instrument The Axiom is supplied with 2 metal couplers, a type HA-1 (ITE) and a type HA-2 (BTE). Note that an ANSI standard coupler for CICs does not exist. These must be tested in the HA-1 coupler.

  • Page 40: Positioning The Hearing Instrument

    User's Guide Version 1.6 © August 2013 ® Axiom Positioning the hearing instrument 1. The hearing instrument should be coupled to the appropriate coupler. See Coupling the hearing instrument. 2. Place the instrument and coupler in the test chamber so that the front microphone opening of the instrument is on the crossbar within the test zone.

  • Page 41: Ansi Hearing Aid Tests

    HFA (or SPA) OSPL90 minus 77 dB. Otherwise the RTP is full on. If required, the Axiom will pause in its testing and guide you in setting the gain control to the RTP. All other controls on the hearing instrument should be set to provide the widest frequency response, the greatest gain and the highest maximum output.

  • Page 42: Ansi 1996 Linear And Agc Tests

    Click to resume the test. During the AGC test, the Axiom will pause to request that AGC controls or programmable parameters be set for maximum AGC effect. If the manufacturer does not provide settings to produce maximum AGC effect, use settings that result in the highest gain for soft sounds and the lowest gain for loud sounds.

  • Page 43: Ansi Test Results

    User's Guide Version 1.6 © August 2013 ® Axiom ANSI test results In 1996 tests: Full-on average gain is measured at 50 dB SPL, average gain at RTP is usually (but not always) measured at 60 dB SPL and the frequency response is run at 60 dB SPL for linear aids or at 50 dB SPL for AGC aids.

  • Page 44: Other Test Box Measures

    10 Other Test Box Measures In addition to the tests of ANSI S3.22, the Axiom also provides the following tests in the test box: Manual control: Coupler and test box reference mic. SPL and coupler mic. distortion at selected 1/12th octave frequencies and stimulus SPL of 0 and 40 –...

  • Page 45: Spectral Analysis In Multicurve

    User's Guide Version 1.6 © August 2013 ® Axiom Spectral analysis in Multicurve Selecting a stimulus level of 0 dB (off) in [Multicurve] presents a spectral analysis of the coupler microphone signal (Scale = dB SPL) or the difference between the coupler and reference microphone spectra (Scale = dB Gain).

  • Page 46: Sound Level Meter Using Manual Control

    Sound level meter using manual control When set for a stimulus level of 0 dB (off), the Manual control mode allows the Axiom to be used as a sound level meter. Sound at the test box reference microphone and the coupler microphone may be analyzed by 1/12th octave, A-weighted or C-weighted filters.
  • Page 47 User's Guide Version 1.6 © August 2013 ® Axiom NOTE: Microphone extension cables (VA-131 & VA-133) are available from Audioscan. Standard audio extension cables should not be used. They will substantially increase noise levels.

  • Page 48: Sensory Loss Simulator

    User's Guide Version 1.6 © August 2013 ® Axiom 11 Sensory loss simulator Sensory loss simulator description A pure conductive loss attenuates loud and soft sounds equally, and is easily simulated by just turning down the volume or inserting an earplug. Losses of a sensory nature are more complex and more difficult to simulate.
  • Page 49 User's Guide Version 1.6 © August 2013 ® Axiom 8. Click on one of the Hearing buttons to simulate the Entered loss, 1/2 Entered loss, or Normal hearing.. 9. Click on to stop the demonstration and freeze the stimulus speech banana on the screen.

  • Page 50: On-Ear Measures - Setup

    It is suggested that a copy of the calibration curves for the probe modules when new be posted near the Axiom for comparison with daily or weekly curves. If there is a drift in calibration with time, the module may need replacement.

  • Page 51: Calibration Check For Probe Module

    User's Guide Version 1.6 © August 2013 ® Axiom 4. Hold the probe module 15 - 90 cm (6 – 36 inches) away from and directly in front of the sound-field loudspeaker. Orientation of the probe module is not critical.

  • Page 52: Max Tm Spl Setup

    User's Guide Version 1.6 © August 2013 ® Axiom 4. Click on the [Start test] bar (which changes to [Stop test]). 5. Hold the probe module about 18 in. (0.5 m) in front of the sound-field speaker. 6. Hold the microphone of a calibrated sound level meter next to the on-ear reference microphone as shown.

  • Page 53: Positioning The Client

    This Max TM SPL setting will be in effect until you change it. If the limit is exceeded during an on-ear test, the Axiom will terminate the test and display the message 'MAX TM SPL EXCEEDED'. You must then decide to either reduce the maximum output limit of the hearing instrument or increase the Max TM SPL setting following the steps above.
  • Page 54 User's Guide Version 1.6 © August 2013 ® Axiom Probe tube insertion: The blue lanyard holds the tube in place and the depth marker is at the intertragal notch...

  • Page 55: On-Ear Measures Screen Setup

    User's Guide Version 1.6 © August 2013 ® Axiom 13 On-Ear Measures Screen Setup To accommodate your working preferences, the appearance of On-ear measurement screens may be changed in several ways. SPL or HL scale In Insertion gain tests, you may view results in either dB HL or dB SPL.
  • Page 56 User's Guide Version 1.6 © August 2013 ® Axiom Hiding a curve does not erase it. To erase curves click on and select one of the Erase options.

  • Page 57: On-Ear Instrument Measures

    Sound level meter using on-ear microphones The manual control feature enables the Axiom to be used as a sound level meter to perform C-weighted, A- weighted or 1/12th octave analysis of sound as measured by the probe and reference microphones. A and C- weighted measurements are limited to frequencies above 100 Hz and the averaging time and update rate are 384 1.

  • Page 58: Recd Measurement

    2cc coupler measurements, further RECD differences will result. The Audioscan RECD measurement protocol uses the Audioscan RECD transducer and a foam tip as the sound source for ear canal SPL measurement and the same transducer and the HA-2 coupler for the 2cc coupler SPL measurement.

  • Page 59: Recd On-Ear Response

    User's Guide Version 1.6 © August 2013 ® Axiom 4. If a valid coupler response exists, go to RECD on-ear response. 5. If no coupler response exists or the measurement interval has been exceeded, connect the RECD transducer to the BTE coupler.
  • Page 60 User's Guide Version 1.6 © August 2013 ® Axiom 1. Click on and select [Speechmap] from either the [Test box] or [On-ear] menus. 2. Click on the [RECD] bar to access the RECD setup poster. 3. Click on the [RECD] list button and select [Measure] from the menu. Then, click on 4.

  • Page 61: Recd Results

    User's Guide Version 1.6 © August 2013 ® Axiom is negative and unstable in the low frequencies, check the seal of the foam tip. Increase the tip size and/or apply a lubricant to the foam tip to improve the seal.

  • Page 62: Insertion Gain

    User's Guide Version 1.6 © August 2013 ® Axiom 16 Insertion Gain Insertion gain is the difference between aided and unaided ear canal SPL (REIG = REAG - REUG). It inherently assumes a sound-field audiogram. For non-linear hearing aids, REIG is stimulus-dependent and the dependency is specific to each hearing aid.

  • Page 63: Insertion Gain In Hl

    User's Guide Version 1.6 © August 2013 ® Axiom Insertion gain in HL See On-Ear Measures - Setup and On-Ear Measures Screen Setup 1. Click on and then click on [Insertion gain] within the On-ear menu. 2. Click on the Instrument button to chose from BTE, ITE, ITC, CIC, CROS, Body. This changes the CORFIG used for 2cc targets.

  • Page 64: Audiometric Data Entry

    Axiom Audiometric data entry Threshold data and parameters may be entered by scanning a barcode on an Audioscan printout, manually using a mouse or the numeric keypad on an external keyboard. See Mouse, keyboard, barcode scanner and Input device operation.

  • Page 65: Rear Measurement Procedure

    User's Guide Version 1.6 © August 2013 ® Axiom 3. If REUR is set to Average, click on the[Audiometry] button, then toggle the [REUR] button to [Measure]. Click on to advance to the Threshold entry poster. You may enter threshold data at this time (see Audiometric data entry) or click on to proceed with the measurement.

  • Page 66: Sii Calculation In Insertion Gain

    SII calculation in Insertion gain The Axiom calculates a Speech Intelligibility Index (SII) value for unaided speech at 70 dB SPL (REUR), the target REIG 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.
  • Page 67 User's Guide Version 1.6 © August 2013 ® Axiom 3. Select REAR 1 and record a response using [Pink noise] at 55. It should be like a normal REUR. If not, the ear may not be fully open. 4. Position the speaker at 45 degrees to the poor ear.

  • Page 68: Speechmap

    1. DSL 5.0 uses RECD values for ages > 119 months from a different source than for ages up to and including 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.

  • Page 69: Dsl 5.0 Changes

    5. Broadband output limiting targets are not provided. DSL 5.0 changes The Audioscan version of DSL 5.0 includes provision for bone conduction and ABR threshold, binaural targets, targets for speech levels from 50 to 75 dB SPL, new targets for children, targets for adults and new RECD default values for children (1 month to 10 years) and adults.

  • Page 70: Camfit In Speechmap

    User's Guide Version 1.6 © August 2013 ® Axiom 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.

  • Page 71: Speechmap Setup

    User's Guide Version 1.6 © August 2013 ® Axiom Before starting, please see On-Ear Measures - Setup, Speechmap Fitting, Speechmap Technical Details and On- Ear or Test Box Mode. To access Speechmap: click on , then click on [Speechmap] in either the On-ear menu or in the Test •...
  • Page 72 User's Guide Version 1.6 © August 2013 ® Axiom 1. To select a stimulus, click the stimulus you want to add to the list. A check mark will be placed next to the selected stimulus. 2. To remove a checked stimulus from the list, click the stimulus you want to remove.

  • Page 73: Screen Tour - Unaided Screen

    User's Guide Version 1.6 © August 2013 ® Axiom Screen tour - unaided screen...

  • Page 74: Screen Tour - Aided Screen

    User's Guide Version 1.6 © August 2013 ® Axiom Screen tour - aided screen On-ear or Test box mode The Speechmap environment provides two hearing instrument verification options: On-ear Speechmap and Test box Speechmap. Using Speechmap in the On-ear menu, the stimulus is controlled by the on-ear reference microphone below the ear and SPL in the ear canal is measured by the probe microphone.

  • Page 75: Sii Calculation In Speechmap

    SII calculation in Speechmap The Axiom calculates a Speech Intelligibility Index (SII) value (in %) for unaided speech 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.
  • Page 76 4. Copy the WAV files from the PC to the top level directory (i.e. not in any folder) of the USB stick. 5. Disconnect the USB stick from the PC and connect it to the USB port on the Axiom.

  • Page 77: Creating Wav Files For Speechmap

    WAV is a commonly used format for digital audio and can be created/edited by nearly all audio editing and recording software. A WAV file has many properties that defines the format of the digital audio. When a USB stick is connected to the Axiom, Speechmap looks for files in the top level directory that have the following properties:...
  • Page 78 User's Guide Version 1.6 © August 2013 ® Axiom Example of user-supplied files, “user.wav”, “user_-4.wav” and “user_+2.5.wav”.

  • Page 79: Speechmap Fitting Procedures

    User's Guide Version 1.6 © August 2013 ® Axiom 18 Speechmap Fitting Procedures The Speechmap fitting screen provides a number of choices for inputing and applying audiometric data for the verification of hearing instrument fittings. The procedures in this section assume a familiarity with Test Box Measures - Setup, On-Ear Measures - Setup, On-Ear Measures Screen Setup and Speechmap.

  • Page 80: Data Entry

    Data entry Threshold data and other audiometric parameters may be entered by scanning the barcode(s) on a previous Audioscan printout or manually using a mouse or an external keyboard. See Mouse, keyboard, barcode scanner, and Input device operation. To enter data from a barcode see Barcode data input and: 1.

  • Page 81: Fitting To Targets For Average Speech

    User's Guide Version 1.6 © August 2013 ® Axiom 3. Click on to start this test. Once the test is started, click on the [Stimulus] list button to select the stimulus type as Speech-std(1), Speech-std(2) or Speech-ISTS. Click on the [Level] list button and select a stimulus level of 50 dB.
  • Page 82 User's Guide Version 1.6 © August 2013 ® Axiom 2. Click on to select the second Speechmap test. The Test 2 box is outlined to indicate it is active. 3. Click on to start this test. Once the test is started, click on the [Stimulus] list button to select the stimulus type as Speech-std(1), Speech-std(2) or Speech-ISTS.

  • Page 83: Adjusting The Maximum Output Level

    User's Guide Version 1.6 © August 2013 ® Axiom Adjusting the Maximum Output Level See Speechmap screen choices for setup and audiometric data entry. See Using Speechmap. 1. Follow the instructions in Speechmap screen choices to enter audiometric data and select the fitting rule.

  • Page 84: Open Fittings In Speechmap

    User's Guide Version 1.6 © August 2013 ® Axiom Open fittings in Speechmap On-ear mode should be used for open and vented fittings. There are no special real-ear SPL targets for open fittings - it doesn’t matter how the sound reaches the TM, the perception is the same. However, the sound that escapes from a vent or open fitting may be detected by the on-ear reference microphone, interfering with the sound-field equalization.
  • Page 85 User's Guide Version 1.6 © August 2013 ® Axiom To test frequency-lowering: 1. Click on and choose Speechmap from either the On-ear or Test box menus. 2. Program the hearing instrument so that the frequency-lowering feature is inactive. 3. Access Test 1, 2 or 3, then, click on to start that test.

  • Page 86: Fm Fitting And Verification

    User's Guide Version 1.6 © August 2013 ® Axiom 7. Click on another Test button, click on and select the same stimulus and stimulus level used in Test 1. 8. Click on to measure and store the long-term signal-averaged result.
  • Page 87 User's Guide Version 1.6 © August 2013 ® Axiom to run and record the speech passage. 3. Attach the FM receiver to the hearing aid and set the FM receiver to the default setting. The FM transmitter should be ON and set to MUTE. Repeat step 2 but use Test 2 instead of Test 1. If the results of Test 1 & Test 2 are not similar, the presence of the FM receiver has changed the intended performance of the hearing aid.

  • Page 88: Speechmap Technical Details

    User's Guide Version 1.6 © August 2013 ® Axiom 19 Speechmap Technical Details Speechmap provides a variety of stimuli for the testing of non-linear hearing aids with a range of digital processing features. Additional information regarding the stimuli and their analysis is provided in Appendix 2 of the printable User's Guide.

  • Page 89: Stimulus Levels

    User's Guide Version 1.6 © August 2013 ® Axiom Stimulus levels LTASS for standard speech is from Cox & Moore (1988). Loud spectrum is from ANSI S3.5-1997. Own voice spectrum is from Cornelisse et al (1991) adjusted to a 1 m reference.

  • Page 90: Speech Signal Analysis

    User's Guide Version 1.6 © August 2013 ® Axiom 1000 1250 -1.6 1600 -0.3 -1.9 -4.0 2000 -4.0 2500 -3.0 3150 -2.0 4000 5000 -1.2 6300 -0.4 -1.8 8000 -1.9 -5.6 Microphone location effects are added after the overall rms level has been set Speech signal analysis One of the most-used measures of a speech signal is the long-term average speech spectrum (LTASS).

  • Page 91: Troubleshooting

    Audioscan for help. Initialize Function Initializing your Audioscan unit will reset it to default factory settings. This erases the user preference files stored in internal memory. Any custom printer choice, network settings, test setups will need to be re-entered and the user calibrations will also be required.

  • Page 92: Test Box High Distortion Or Noise

    • Computers, fans and air conditioners may be the source of the vibration. Try turning off suspected sources to identify the cause. Relocate the source or the Axiom on a foam pad. Test box curves inconsistent The test box curves keep changing from test to test.

  • Page 93: Test Box Speaker Overdriven

    No on-ear ref. mic. detected No (right or left) on-ear reference mic. detected. This message may be displayed when starting an On-ear test. It indicates that the Axiom is not measuring any sound at the on-ear probe reference microphone. Check that a probe microphone assembly is securely plugged into the PROBE socket underneath the test •...

  • Page 94: Invalid On-Ear Calibration

    User's Guide Version 1.6 © August 2013 ® Axiom Unplug the test box reference microphone in the test chamber and plug the on-ear probe microphone in its • place. Try Test box calibration using the reference microphone of the on-ear probe microphone in place of the test box reference microphone.
  • Page 95 User's Guide Version 1.6 © August 2013 ® Axiom If your scanner has a Unitech logo, scan the following barcode to reset the scanner to its default settings.
  • Page 96 User's Guide Version 1.6 © September 2013 Axiom ®...

  • Page 97: Technical Specifications

    User's Guide Version 1.6 © September 2013 Axiom ® 21 Technical (200-2000 Hz)..........±1.5 dB SPL (2000-8000 Hz)........±2.5 dB SPL Equalization method......pressure method Specifications Analysis frequencies per octave......12 Analysis filter bandwidth......1/12 octave Specifications subject to change without notice Measurement accuracy at 1 kHz......±1db Measurement accuracy re 1 kHz.±1 dB (200-5000 Hz)

  • Page 98: Sensory Loss Simulator

    User's Guide Version 1.6 © September 2013 Axiom ® ..........Real-Ear Insertion Gain Other tests available ..Speechmap ® real-speech audibility measures .......... On-ear harmonic distortion ..........On-ear spectral analysis ......On-ear noise reduction verification ... Manual measurement of output, gain and distortion Fitting methods available ..
  • Page 99 User's Guide Version 1.6 © August 2013 ® Axiom...

  • Page 100: Glossary

    User's Guide Version 1.6 © August 2013 ® Axiom 22 Glossary AGC, Automatic Gain Control, the means by which gain is automatically controlled by the level of the signal being amplified. (ANSI S3.22) AGC-I, input-controlled AGC (see "input compression"). AGC-O, output controlled AGC (see "output compression").
  • Page 101 User's Guide Version 1.6 © August 2013 ® Axiom FOG, full on gain, gain for a 50 dB input SPL with the gain control set to maximum ANSI S3.22) Gain (in dB), output sound pressure relative to input sound pressure, expressed in decibels; gain = 20log10 (output sound pressure / input sound pressure);...
  • Page 102 User's Guide Version 1.6 © August 2013 ® Axiom MPO, Maximum Power Output, the maximum SPL that a hearing aid can deliver in response to a steady narrow band input. The stimulus may be pulsed (a tone burst) to avoid discomfort and to approximate an aided UCL measurement stimulus.
  • Page 103 User's Guide Version 1.6 © August 2013 ® Axiom REOR is used to evaluate the seal of an earmold. It is not related to the required gain of a hearing aid. REUG, Real-Ear Unaided Gain , difference, in dB as a function of frequency, between the SPL (or BSPL) at a specified measurement point in the ear canal and the SPL (or BSPL) at a field reference point, for a specified sound field, with the ear unoccluded (ANSI S3.46).
  • Page 104 User's Guide Version 1.6 © August 2013 ® Axiom uncomfortable. VGA, video graphics adapter. VC, Volume Control, a user-operated gain control. Warble Tone, a frequency-modulated sine wave. The modulating signal is often a low frequency triangle wave. 1. Valente, M: Strategies for Selecting and Verifying Hearing Aid Fittings. New York:Thieme Medical Publishers, Inc.,1994.

  • Page 105: References

    Byrne, D. (1977). The speech spectrum - Some aspects of its significance for hearing aid selection and evaluation. British Journal of Audiology, 11,40-46. Cole, W.A. & Sinclair, S.T. (1998). The Audioscan RM500 Speechmap/DSL fitting system. Trends in Amplification, 3(4):125-139. Corliss, E. L. R. (1990) The ear as a mechanism of communication. Journal of Audio Engineering Society, 38(9):640-652.
  • Page 106 User's Guide Version 1.6 © August 2013 ® Axiom Hawkins, D.B., Walden, B.E., Montgomery, A.A., & Prosek, R.A., (1987). Description and validation of an LDL procedure designed to select SSPL90. Ear and Hearing ,8:162-169. Killion, M. C., & Monser, E. L. (1980). "Corfig: Coupler response for flat insertion gain." In G. A. Studebaker and I.
  • Page 107 User's Guide Version 1.6 © August 2013 ® Axiom characteristics for young children. Journal of the Academy of Rehabilitative Audiology, 20, 25-38. Seewald, R., Moodie, S. T., Scollie, S. & Bagatto, M. (2005). The DSL method for pediatric hearing instrument fitting: Historical perspective and current issues.

  • Page 108: Manufacturer Disclosure Statement For Medical Device Security

    User's Guide Version 1.6 © August 2013 ® Axiom 24 Appendix 1 Manufacturer Disclosure Statement for Medical Device Security...
  • Page 109 User's Guide Version 1.6 © August 2013 ® Axiom...
  • Page 110 User's Guide Version 1.6 © August 2013 ® Axiom...
  • Page 111 Live audio (speech, music etc.) may also be used as a test signal but it is not controlled for spectrum or level. 09/01/29 © Etymonic Design Incorporated, 20 Ludwig St., Dorchester, ON, Canada N0L 1G4 USA 800-265-2093 519-268-3313 FAX 519-268-3256 www.audioscan.com...
  • Page 112 ± 3% over 128 ms). Figure 1: 1/3 octave spectra for the pink noise signal and the noise signal specified in ANSI S3.42-1997. 09/01/29 © Etymonic Design Incorporated, 20 Ludwig St., Dorchester, ON, Canada N0L 1G4 USA 800-265-2093 519-268-3313 FAX 519-268-3256 www.audioscan.com...
  • Page 113 1/12 octave resolution these features disabled. 09/01/29 © Etymonic Design Incorporated, 20 Ludwig St., Dorchester, ON, Canada N0L 1G4 USA 800-265-2093 519-268-3313 FAX 519-268-3256 www.audioscan.com...
  • Page 114 09/01/29 © Etymonic Design Incorporated, 20 Ludwig St., Dorchester, ON, Canada N0L 1G4 USA 800-265-2093 519-268-3313 FAX 519-268-3256 www.audioscan.com...
  • Page 115 6. Note that curves are 1/3 octave band levels at 1/12 octave intervals which causes the 1/3 octave bands at 4000, 5000 and 6300 Hz to appear broader than 1/3 octave. For clarity, the Speech3150 curve has been omitted. 09/01/29 © Etymonic Design Incorporated, 20 Ludwig St., Dorchester, ON, Canada N0L 1G4 USA 800-265-2093 519-268-3313 FAX 519-268-3256 www.audioscan.com...
  • Page 116 Figure 5: Loud vocal effort effect in dB re nominal band levels. Nominal band levels are band levels for an overall SPL of 65 dB. This shaping is applied to the 75 dB SPL speech and ICRA signals. Figure 6: Microphone location effects in dB re nominal band SPL. Nominal band levels are band levels for an overall rms level of 65 dB SPL and average vocal effort in a free sound field.
  • Page 117 In addition to these well-controlled and repeatable bands. Other analyzers use narrower analysis bands, signals, live speech may be used as a test signal. It sometimes having constant bandwidth. As shown in will, of course, be unequalized and at an uncontrolled Figure 7, this can result in significantly underestimat- level.
  • Page 118 Pink noise signal analysis requirement and, for this reason, all Speechmap pas- sages are at least 10 seconds long. The LTASS curves All band levels are calculated with an averaging time displayed in Speechmap are 1/3 octave band levels of 128 ms. at 1/12 octave intervals.
  • Page 119 Figure 9: Example of speech envelope and LTASS 09/01/29 © Etymonic Design Incorporated, 20 Ludwig St., Dorchester, ON, Canada N0L 1G4 USA 800-265-2093 519-268-3313 FAX 519-268-3256 www.audioscan.com...
  • Page 120 Figure 10: Speech is detectable but not understandable if the 99th percentile is at threshold Figure 11: When LTASS is at threshold, SII ≈ 33% which corresponds approximately to SRT 09/01/29 © Etymonic Design Incorporated, 20 Ludwig St., Dorchester, ON, Canada N0L 1G4 USA 800-265-2093 519-268-3313 FAX 519-268-3256 www.audioscan.com...
  • Page 121 Figure 12: The highest SII is obtained when the entire speech envelope is above threshold Figure 13: Level of 99th percentile for Speechmap speech signals at average vocal effort 09/01/29 © Etymonic Design Incorporated, 20 Ludwig St., Dorchester, ON, Canada N0L 1G4 USA 800-265-2093 519-268-3313 FAX 519-268-3256 www.audioscan.com...
  • Page 122 Figure 14: Level of 30th percentile for Speechmap speech signals at average vocal effort Figure 15: Dynamic range of Verifit speech signals at average vocal effort 09/01/29 © Etymonic Design Incorporated, 20 Ludwig St., Dorchester, ON, Canada N0L 1G4 USA 800-265-2093 519-268-3313 FAX 519-268-3256 www.audioscan.com...

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