audioscan Verifit VF-1 User Manual
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audioscan Verifit VF-1 User Manual

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Audioscan Verifit
User's Guide 3.12
© November 2015

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Summary of Contents for audioscan Verifit VF-1

  • Page 1 ® Audioscan Verifit User's Guide 3.12 © November 2015...

  • Page 2: Table Of Contents

    Table of Contents 1 About Verifit..................................6 New in this software release..............................6 Product description................................6 Associated items and supplies..............................7 SAFETY WARNINGS and NOTICES..........................7 Environmental safety................................9 Declaration of Electromagnetic Compatibility (EMC).......................9 Warranty, Trademarks, Acknowledgments........................10 EC Declaration of Conformity............................11 Electronic User’s Guide..............................12 How to Avoid Undesirable Side Effects..........................12 2 Getting Started..................................14 Unpacking and connecting..............................14 Microphone connection..............................15...
  • Page 3 User's Guide Version 3.12 © November 2015 ® Verifit ANSI test frequencies.................................41 Test box calibration facts..............................41 Calibrating test box reference microphone........................42 Calibration check for coupler microphone........................43 Coupling the hearing instrument for ANSI tests.......................44 Coupling the hearing instrument for Test box Speechmap....................44 Positioning the hearing instrument............................45 9 ANSI Hearing Aid Tests..............................47 ANSI S3.22-1996 facts...............................47...
  • Page 4 User's Guide Version 3.12 © November 2015 ® Verifit On-ear feedback test................................76 On-ear noise reduction test..............................76 On-ear manual control................................77 Sound level meter using on-ear microphones........................78 15 Occlusion Effect Test.................................80 Occlusion effect measurement............................80 16 RECD measurement................................81 Calibration of RECD transducer............................81 Measure RECD ..................................82 RECD results..................................83 ANSI S3.46(2013) RECD ..............................84 RECD protocols..................................84...
  • Page 5 User's Guide Version 3.12 © November 2015 ® Verifit Speech signal analysis..............................116 21 Viewport...................................117 Viewport setup..................................117 Accessing Viewport tests..............................118 Viewport Audibility test..............................118 Viewport Test box directional test...........................119 Viewport Test box feedback test............................122 Viewport On-ear feedback test............................123 22 Troubleshooting................................125 Self test failures................................125 Initialize Function................................125 Test box high distortion or noise............................126 Test box curves inconsistent............................126...

  • Page 6: About Verifit

    ® Verifit 1 About Verifit This section provides a listing of features new in this software release, describes the Audioscan Verifit, provides contact, warranty and trademark information, safety warnings and notices and instructions for accessing the electronic User’s Guide. Note that the User's Guide may be viewed on the Verifit at any time by pressing <Help>. (For long Help pages, use <Left/Right>...

  • Page 7: Associated Items And Supplies

    VA-100 Soft case for Verifit VA-111 External speaker with folding stand and clips for microphone extension cables VA-120 Barcode scanner for reading barcoded audiometric data on printouts from Audioscan analyzers VA-131 Microphone extension cable (3') for use with Audioscan analyzers VA-133 Microphone extension cable (10') for use with Audioscan analyzers ®...
  • Page 8 Failure to follow the operating instructions for connecting to a network, a local printer, a barcode scanner, or a keyboard, or an external monitor could place the operator at risk Failure to follow the operating instructions for connecting the mouse, or the Audioscan update stick could place the operator at risk...

  • Page 9: Environmental Safety

    User's Guide Version 3.12 © November 2015 ® Verifit Environmental safety This symbol on the product means that this product is not to be disposed of in unsorted municipal waste because electrical and electronic waste may contain hazardous substances which could endanger the environment and human health.

  • Page 10: Warranty, Trademarks, Acknowledgments

    Audioscan service agent. This warranty does not apply to equipment that, in our sole judgment, has been subject to misuse, or unauthorized alteration or repair.

  • Page 11: Ec Declaration Of Conformity

    User's Guide Version 3.12 © November 2015 ® Verifit EC Declaration of Conformity...

  • Page 12: Electronic User's Guide

    Failure to follow operating instructions could place the user or operator at risk. You can download the current User's Guide directly from www.audioscan.com. A printable User's Guide is also provided with each new instrument and each software update. A .pdf file viewer, such as Acrobat Reader (5.0 or higher) or Foxit Reader is required to view the User’s Guide.
  • Page 13 User's Guide Version 3.12 © November 2015 ® Verifit Following are the actions which a user should take to ensure that these risk control measures continue to be effective Loud Sounds: The Verifit is designed to produce sound pressure levels as high as 85 dB at the probe reference microphone. Exposure to these levels for more than 7 hours can produce hearing damage.

  • Page 14: Getting Started

    User's Guide Version 3.12 © November 2015 ® Verifit 2 Getting Started This section provides instructions for unpacking the Verifit and connecting various components and associated items. Unpacking and connecting WARNING: To avoid the risk of electrical shock, use only the power cord supplied with the Verifit and connect it only to a grounded (protectively earthed) electrical outlet.

  • Page 15: Microphone Connection

    User's Guide Version 3.12 © November 2015 ® Verifit 3. Connect the power cord to the socket next to the power switch on the left side of the main display unit. Plug the other end into a grounded 100 – 240 volt power outlet. Microphone connection 1.

  • Page 16: General Care Instructions

    Coupler leakage can cause feedback and erratic response curves. 4. DO make sure the tubing on the BTE (HA-2) coupler is free from any cracks/tears. 5. DO make sure that any replacement tubing used on the BTE coupler is either obtained from Audioscan, or is...

  • Page 17: Battery Pill Use And Care

    User's Guide Version 3.12 © November 2015 ® Verifit #13 heavy wall earmold tubing exactly 10 mm in length. Probe microphone: Debris can alter the probe module reference microphone calibration and frequency response and can permanently clog the probe module port. 1.

  • Page 18: Mouse, Keyboard, Barcode Scanner

    An optional barcode scanner may be connected to a USB port to enter threshold, UCL and RECD data directly from Audioscan printouts. Barcoded threshold data printed by some Grason-Stadler audiometric equipment may also be scanned. Scanners other than that supplied by Audioscan may not work and are not supported by Audioscan.

  • Page 19: External Peripherals

    Connectors for external front and back sound-field speakers are provided. The VA-111 external speaker with a multipurpose folding stand is available from Audioscan but any small, non-powered 4 - 8 ohm speaker having a smooth frequency response and good efficiency may be used. The rear external speaker is automatically selected when required by a test but the front speaker must first be selected in Setup.
  • Page 20 User's Guide Version 3.12 © November 2015 ® Verifit Verifit connector panel – serial number below 4671. The RS232 Serial port and Aux Audio connectors are not active in this version of software.

  • Page 21: General Operation

    Failure to follow operating instructions could place the user or operator at risk. In Speechmap, Viewport 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,...

  • Page 22: Keypad Keys

    User's Guide Version 3.12 © November 2015 ® Verifit RECD, audiometric transducer, age, and ABR nHL to eHL conversion factors are encoded. In Insertion gain, threshold and audiometric transducer type are encoded. The type of data and the ear (left, right or left/right) is shown below the barcode.

  • Page 23: Menus, Lists And Buttons

    User's Guide Version 3.12 © November 2015 ® Verifit Move across screen columns. Arrows Arrows Move within a screen column. Round Key (<PICK> key) Select a highlighted item or operate a screen button. <Continue> Proceed from current state. <Cancel> Revert to previous state. Menus, lists and buttons Menu buttons Screen buttons...

  • Page 24: Software Updating

    If your Verifit has a CD-ROM drive (serial number less than 4671), you may download the latest software from www.audioscan.com and burn it to a CD-ROM. Alternately, you may request that a CD-ROM be mailed to you. To install the new CD-ROM: 1.

  • Page 25: General Setup

    User's Guide Version 3.12 © November 2015 ® Verifit 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 26 User's Guide Version 3.12 © November 2015 ® Verifit 1. Press <Setup>, then highlight and <PICK> [Save option] 2. Highlight and <PICK> [Save test setups on power off] to toggle between Yes and No. To enable/disable erasing of test levels, stimuli and assessment parameters when Erase data is selected: 1.

  • Page 27: Networking

    User's Guide Version 3.12 © November 2015 ® Verifit 5 Networking Failure to follow operating instructions could place the user or operator at risk. Connection to a computer network allows screen images to be printed on a network printer or on a shared printer on a networked PC.

  • Page 28: Noah Service Port

    Windows PC and computer network. The Audioscan NOAH Module communicates with the Verifit through the NOAH network service. The Verifit provides the NOAH service on a TCP port. The Windows computer running the module must be configured to access the same TCP port, which is 8080 by default.

  • Page 29: Testing The Noah Service Port

    User's Guide Version 3.12 © November 2015 ® Verifit 3. Select <Continue>. 4. You will be prompted to restart the equipment. Select <Continue> to restart, or <Cancel> to enter a different port number. Testing the NOAH service port The Verifit provides the NOAH service using the HTTP protocol. Communication between the Windows PC and the Verifit can be tested using an ordinary web browser.

  • Page 30: Single Computer Connection

    User's Guide Version 3.12 © November 2015 ® Verifit 6 Single computer connection Most office computers today are already connected to a network, through either a wired or wireless (wifi) interface. In these cases, the Verifit must be added to the same network as the computer. (See Networking for details.) In cases where no network exists, the Verifit can be networked directly to a single computer.
  • Page 31 User's Guide Version 3.12 © November 2015 ® Verifit 255.255.255.0 in the Subnet mask box. 6. On the Verifit, un-check Auto (use DHCP) on the Setup network screen and click the Change button. Then set the network addresses as shown below by clicking on the down arrow buttons and selecting from the drop-down lists.

  • Page 32: Printing And Storing Results

    USB memory stick or in a Windows-shared folder on a networked PC for further analysis or to be restored to a Verifit or another 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 33: Barcodes, Tabular Data, Headers And Comments On Printouts

    User's Guide Version 3.12 © November 2015 ® Verifit 4. Insert the paper’s leading edge into the lower slot at rear of tray. 5. Feed the paper by highlighting the on-screen [Paper Feed] button and pressing <PICK>. 6. Advance the paper until it comes out of the upper slot. 7.

  • Page 34: Local Printer Setup

    User's Guide Version 3.12 © November 2015 ® Verifit Local printer setup Failure to follow operating instructions could place the user or operator at risk. 1. Connect an external printer to a USB port on the rear connector panel. Only PCL 3 (not PCL3GUI), PCL 5, ! PostScript compatible printers are supported, as well as, HP Laserjet Pro 1660, and Deskjet models 3050, 1000, D2680, D4160, 6940 and 460.

  • Page 35: Network Printer Setup

    User's Guide Version 3.12 © November 2015 ® Verifit message disappears. NOTE: To input a file name from a connected keyboard each time you print, see Barcodes, tabular data, headers and comments on printouts. NOTE: To save all test data as an xml file, see Storing and restoring data Network printer setup To print to a network printer or to a Windows-shared printer on the network, you must first enable networking.

  • Page 36: Storing And Restoring Data - Setup

    User's Guide Version 3.12 © November 2015 ® Verifit 4. Highlight and <PICK> [Full screen], [Main window] (full screen without the message line or [Active window] (foreground image only). 5. Connect a USB computer keyboard to the Verifit and fill in [Computer], [Share name], [Username] and [Password] (not needed for Windows 95/98).

  • Page 37: Storing And Restoring Data

    3. Pick <Continue> to store the current session data to the file in the Client ID window. NOTE: A style sheet (audioscan.xsl) is automatically saved with the data file. To open the saved data file in Excel, right click on the file and select Open With.> Microsoft Excel. When prompted for a style sheet, select...

  • Page 38: Data Storage Using Noah

    6. Highlight and <PICK> the Session list button to generate a list of previously stored sessions for the indicated Client ID. 7. Highlight and <PICK> a session and press <Continue>. 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 39: Test Box Measures - Setup

    User's Guide Version 3.12 © November 2015 ® Verifit 8 Test Box Measures - Setup The appearance of test box screens may be changed in several ways. Most screens may be viewed as a single, full-screen or dual, side by side panels. Most screens may be formatted to show results in graphical or tabular format.

  • Page 40: Format

    User's Guide Version 3.12 © November 2015 ® Verifit Format Except for Viewport, Distortion, Input/Output, Battery drain and Manual control screens, you have the option of selecting either a graphic or tabular format. To change the data format, highlight, then <PICK> [Graph] or [Table]. Scale On the Multicurve test screen, you have the option of displaying test results in SPL (dB) or gain (dB).

  • Page 41: Ansi Test Frequencies

    User's Guide Version 3.12 © November 2015 ® Verifit 3. Press <Continue> to exit ANSI test frequencies The Frequencies feature allows hearing instruments to be evaluated at the Special Purpose Average (SPA) frequencies defined by ANSI S3.22, rather than the default High Frequency Average (HFA) frequencies. The choice of SPA (or HFA) frequencies influences the average OSPL90, average full-on gain, reference test gain, bandwidth and equivalent input noise.

  • Page 42: Calibrating Test Box Reference Microphone

    User's Guide Version 3.12 © November 2015 ® Verifit 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. 2.

  • Page 43: Calibration Check For Coupler Microphone

    User's Guide Version 3.12 © November 2015 ® Verifit Calibration check for coupler microphone Accuracy of test box measurements depends on the calibration of the coupler microphone. This should be checked regularly using a microphone calibrator with an adapter ring. The RE780 (1 1/8 in.) and RE781 (1in.) rings are designed for Quest CA22 and QC-10/20 respectively.

  • Page 44: Coupling The Hearing Instrument For Ansi Tests

    S3.22 is machined into the metal stem of the HA-2 coupler. The HA-2 coupler tubing should be inspected regularly for cracks which will cause feedback. If the tubing is worn or damaged, contact Audioscan for a replacement. Alternatively, it can be replaced by a 10 mm length of #13 heavy wall earmold tubing.

  • Page 45: Positioning The Hearing Instrument

    User's Guide Version 3.12 © November 2015 ® Verifit BTE instruments may be coupled either directly to the HA-2 (BTE) coupler, or to the HA-1 coupler using the client’s earmold and blue putty. When using the earmold, ensure that the mold is well-sealed to the coupler and that the medial end is flush with the inside of the coupler opening.
  • Page 46 User's Guide Version 3.12 © November 2015 ® Verifit 4. Position the test box reference microphone as close as possible to the (front-facing) microphone opening of the hearing instrument without touching it. 5. Close and seal the test chamber.

  • Page 47: Ansi Hearing Aid Tests

    User's Guide Version 3.12 © November 2015 ® Verifit 9 ANSI Hearing Aid Tests These tests follow the procedures of ANSI S3.22-1996 or ANSI S3.22-2003 as selected in Setup. See 1996 or 2003 ANSI standard : Linear: An automated test sequence for linear hearing aids per ANSI S3.22. AGC: An automated test sequence for AGC hearing aids per ANSI S3.22.

  • Page 48: Ansi 1996 Linear And Agc Tests

    User's Guide Version 3.12 © November 2015 ® Verifit The OSPL90 curve, the HFA (or SPA) and peak value of this curve, the frequency of the peak, the HFA (or SPA) full-on gain are determined at full-on gain setting. The response curve, frequency range, Reference Test Gain, battery drain, equivalent input noise, distortion, attack and release times are determined at RTS.

  • Page 49: Ansi Test Results

    User's Guide Version 3.12 © November 2015 ® Verifit settings that result in the highest gain for soft sounds and the lowest gain for loud sounds. This will typically result in the lowest compression threshold, a flat I/O curve and the longest attack/release times. These are not 'typical' characteristics but indicate the adjustment range possible for these parameters.

  • Page 50: Ansi Telecoil Terminology

    User's Guide Version 3.12 © November 2015 ® Verifit used. See ANSI S3.22-1996 facts and ANSI S3.22-2003 facts. The [Input/Output] test allows you to generate up to 4 separate input/output curves at each of 5 individual frequencies (250, 500, 1000, 2000, 4000 Hz) as provided in ANSI S3.22.

  • Page 51: Ansi Telephone Simulator (Tmfs) Test

    User's Guide Version 3.12 © November 2015 ® Verifit SPLIV minus (RTG + 60). A positive TLS indicates greater output when listening in a room loop than when using the microphone. ANSI telephone simulator (TMFS) test ANSI S3.22 requires that the gain control be set to RTP (1996) or RTS (2003) before running this test. The reference test gain (RTG) is required in order to calculate the STS (1996) or RSETS (2003).

  • Page 52: Ansi Test Loop Test

    User's Guide Version 3.12 © November 2015 ® Verifit ANSI test loop test ANSI S3.22 requires that the gain control be set to RTP (1996) or RTS (2003) before running this test. The reference test gain (RTG) is required in order to calculate the STS (1996) or RTLS (2003). The easiest way to meet both requirements is to run a [Linear] or [AGC] test before running this test.
  • Page 53 User's Guide Version 3.12 © November 2015 ® Verifit...

  • Page 54: Other Test Box Measures

    User's Guide Version 3.12 © November 2015 ® Verifit 10 Other Test Box Measures In addition to the tests of ANSI S3.22, the Verifit 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 55: Feedback Suppression Test

    User's Guide Version 3.12 © November 2015 ® Verifit 3. Highlight and <PICK> a stimulus type from the list box. 4. Highlight and <PICK> a stimulus level from the list box. 5. Highlight and <PICK> [Start test] 6. Highlight and <PICK> [Continue] to capture the comparison curve once the noise reduction function has responded.

  • Page 56: Directional Function Test

    User's Guide Version 3.12 © November 2015 ® Verifit Directional function test Directional characteristics such as polar plots and Directivity Index (DI) are typically measured in a large anechoic chamber using sound from one direction and at one frequency at a time. This means they apply only for a hearing aid set for linear amplification.

  • Page 57: Directional Ite Positioning

    User's Guide Version 3.12 © November 2015 ® Verifit Directional ITE positioning Attach the provided clip to the coupler for stability. Orient the instrument as shown so that the direction of maximum sensitivity is toward one of the speakers and a line joining the microphone ports is at 45° and horizontal.

  • Page 58: Test Box Directional Procedure

    User's Guide Version 3.12 © November 2015 ® Verifit Test box directional procedure To test directional function in the test chamber: 1. Mount the hearing aid to the appropriate coupler (see Coupling the hearing instrument). 2. Position the hearing instrument in the test chamber as shown in 9.6: Directional ITE positioning or 9.7: Directional BTE positioning.

  • Page 59: Multicurve Procedure

    User's Guide Version 3.12 © November 2015 ® Verifit 7. Press <Continue> to capture curves or press <Cancel> to abort the test. Captured curves are labeled L (left speaker response) and R (right speaker response) followed by the test number (1 - 4). To test directional function in situ, see On-Ear Instrument Measures Multicurve procedure Multicurve generates 1 to 4 output or gain response curves using either pink noise or swept pure tones at input...

  • Page 60: Spectral Analysis In Multicurve

    User's Guide Version 3.12 © November 2015 ® Verifit 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 61: Manual Control Procedure

    User's Guide Version 3.12 © November 2015 ® Verifit 3. Highlight and <PICK> [Battery type] and select from drop-down list. 4. Highlight and <PICK> [Hours per day] and select from drop-down list. 5. Highlight and <PICK> [Start test] Manual control procedure Manual control displays the reference microphone SPL, the coupler microphone SPL, their difference in dB (gain) and coupler microphone signal distortion at any selected 1/12th octave frequency and at a selected input level from 40 to 90 dB (in 5 dB steps) and at 0 dB (off).

  • Page 62: Sound Level Meter Using Manual Control

    <PICK> [Stop test]. You may change Level and Frequency without stopping the test. 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 63 User's Guide Version 3.12 © November 2015 ® Verifit...

  • Page 64: Sensory Loss Simulator

    User's Guide Version 3.12 © November 2015 ® Verifit 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. The most common sensory loss is caused by outer hair cell damage and results in loss of audibility for soft sounds but near-normal loudness for loud sounds.

  • Page 65: On-Ear Measures - Setup

    User's Guide Version 3.12 © November 2015 ® Verifit 12 On-Ear Measures - Setup For accurate, repeatable measurements, the Verifit must be properly set up and calibrated, the client must be properly positioned and the probe tube must be properly positioned in the ear canal. Some common terms: Real-Ear Unaided Response (REUR): SPL, or band SPL, in the open (unaided) ear canal for a given stimulus.

  • Page 66: Calibration Of On-Ear Probe Microphone

    User's Guide Version 3.12 © November 2015 ® Verifit process compares this response with the flat, factory-calibrated response of the on-ear reference microphone and compensates all subsequent probe-tube measurements for this difference. It may be performed as often as desired but will be invalidated at 12 am the following day or at 12 am the following Monday, depending on the choice of Daily or Weekly calibration interval.

  • Page 67: Calibration Check For Probe Module

    User's Guide Version 3.12 © November 2015 ® Verifit +/- 5 dB. 6. To change the calibration interval, highlight & <PICK> [Daily] or [Weekly]. Press <Left/Right> and repeat the process for the other probe module. Calibration check for probe module The calibration curve for the probe module is a comparison of the response of the probe microphone (with tube) to the response of the on-ear reference microphone.

  • Page 68: Max Tm Spl Setup

    User's Guide Version 3.12 © November 2015 ® Verifit The probe module should be replaced if it fails this test. Max TM SPL setup The Max TM SPL safety feature allows you to set a limit on the SPL, measured by the probe microphone, above which a test terminates.

  • Page 69: Abr Nhl To Ehl Setup

    User's Guide Version 3.12 © November 2015 ® Verifit If the limit is exceeded during an on-ear test, the Verifit 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 70: Positioning The Probe Tube

    User's Guide Version 3.12 © November 2015 ® Verifit 3. Position the back speaker (if used) directly behind and facing the back of the client’s head so that front and rear speakers are at the same height and are at the same distance from the center of the client’s head. Positioning the probe tube WARNING: Probe tubes are for single-patient use only.
  • Page 71 User's Guide Version 3.12 © November 2015 ® Verifit Probe tube insertion: The blue lanyard holds the tube in place and the depth marker is at the intertragal notch...

  • Page 72: On-Ear Measures Screen Setup

    User's Guide Version 3.12 © November 2015 ® Verifit 13 On-Ear Measures Screen Setup To accommodate your working preferences, the appearance of On-ear measurement screens may be changed in several ways. On-ear single or dual view Most on-ear screens give you the option of selecting either a single, full-screen view or a dual, side by side view.

  • Page 73: Graph, Table Or 2Cc Target Format

    User's Guide Version 3.12 © November 2015 ® Verifit Graph, table or 2cc target format Most on-ear test screens may be viewed in graphic or tabular format. In RECD and Directional tests, highlight and <PICK> [Format] to toggle between [Graph] and [Table] •...
  • Page 74 User's Guide Version 3.12 © November 2015 ® Verifit 2. Highlight, then <PICK> the desired test to toggle between the Hide or Show options. The curve will toggle on or off when selected. The envelope of speech curves in Speechmap may be displayed or hidden for clarity of display by toggling the buttons under the - column.

  • Page 75: On-Ear Instrument Measures

    User's Guide Version 3.12 © November 2015 ® Verifit 14 On-Ear Instrument Measures A number of the tests covered in Test box measures can also be performed with the hearing instrument coupled to the ear of a client rather than to a 2cc coupler. The on-ear results may be expected to differ from the test box results because of the different acoustic environment and the different acoustic load.

  • Page 76: On-Ear Feedback Test

    User's Guide Version 3.12 © November 2015 ® Verifit from the drop-down list. For an adaptive directional instrument, a stimulus level between 60 and 70 dB should cause the separation to change over a 15 – 45 second period. For a noise-reducing instrument, both curves may change with time and stimulus SPL.

  • Page 77: On-Ear Manual Control

    User's Guide Version 3.12 © November 2015 ® Verifit Refer to On-Ear Measures - Setup to prepare the system for use and for proper positioning of the client and the probe tube. 1. Press <Tests>, then highlight and <PICK> [On-ear measures], then highlight and pick [Noise reduction]. 2.

  • Page 78: Sound Level Meter Using On-Ear Microphones

    User's Guide Version 3.12 © November 2015 ® Verifit 3. Highlight and <PICK> the Level window, then highlight and <PICK> the desired stimulus level from the drop-down list. 4. Highlight and <PICK> the Frequency window, then highlight and <PICK> the desired frequency from the drop-down list.
  • Page 79 User's Guide Version 3.12 © November 2015 ® Verifit 2. Press <Tests>, then highlight and <PICK> [On-ear measures], then highlight and <PICK> [Manual control]. 3. Highlight and <PICK> the Level window, then highlight and <PICK> 0 dB stimulus level from the drop- down list.

  • Page 80: Occlusion Effect Test

    User's Guide Version 3.12 © November 2015 ® Verifit 15 Occlusion Effect Test The occlusion effect refers to the unnatural sound of one’s own voice that results from occluding the external ear. It is the result of the high SPL produced at the back of the throat during a closed vowel utterance coupling to the closed ear canal via bone conduction.

  • Page 81: Recd Measurement

    User's Guide Version 3.12 © November 2015 ® Verifit 16 RECD measurement The RECD (real-ear to coupler difference) may be individually measured to improve the accuracy of hearing aid fittings. The measurement procedure may be accessed by selecting RECD from the On-ear tests list or from the Audiometry poster within Speechmap.

  • Page 82: Measure Recd

    User's Guide Version 3.12 © November 2015 ® Verifit Measure RECD Connect the RECD transducer to the RECD jack on the front of the test chamber. Prepare the system for on-ear tests. See Calibration of on-ear probe microphone.

  • Page 83: Recd Results

    1. Press <Tests> then highlight and <PICK> [On-ear measures], then highlight and <PICK> [RECD]. 2. Select the RECD coupling method that will be used on the ear. Audioscan software supports both foam eartips and personal earmold, however this choice must be made prior to measurement.

  • Page 84: Ansi S3.46(2013) Recd

    User's Guide Version 3.12 © November 2015 ® Verifit ANSI S3.46(2013) RECD The ANSI S3.46(2013) Real Ear standard advises RECD measurement protocols that make the RECD a property of the ear itself, and independent of transducer or acoustic coupling. To achieve this accuracy certain conditions must be met in both RECD measurement and Test-box Speechmap coupling.
  • Page 85 HL threshold correction, and error is minimized. Alternate method #1: RECD On-ear measurement: Audioscan RECD transducer + client’s personal earmold Test-box Speechmap coupling: HA-2 (BTE) coupler This method utilizes the client’s personal earmold for the on-ear RECD measurement. The HA-1 RECD is converted to HA-2 reference with earmold effects retained and is applied in Testbox Speechmap.The error...

  • Page 86: Recd Facts

    2cc coupler measurements, further RECD differences will result. Audioscan uses the HA-2 (BTE) coupler for the transducer calibration, then our RECD transducer and either a foam eartip or the client's personal earmold for the real ear measurement. When a foam tip is used, we subtract the two measurements to get an HA-1 RECD.

  • Page 87: Insertion Gain

    User's Guide Version 3.12 © November 2015 ® Verifit 17 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 88: Insertion Gain In Hl

    This estimate assumes a) the unaided threshold is a sound-field threshold and b) a linear aid (i.e. REIG doesn’t depend on level). The REUR curve uses the right-hand SPL scale and is shown for reference only. Audiometric data entry Threshold data and parameters may be entered by scanning a barcode on a previous Audioscan printout or...

  • Page 89: Reur Measurement Procedure

    User's Guide Version 3.12 © November 2015 ® Verifit manually using a mouse, the keypad or the numeric keypad on 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 90: Rear Measurement Procedure

    User's Guide Version 3.12 © November 2015 ® Verifit data at this time (see Audiometric data entry) or press <Continue> to proceed with the measurement. 4. Highlight and <PICK> REUR (below REAR/REIG test 3). 5. Press <Continue> to accept the default 55 dB SPL Pink noise stimulus and capture the REUR curve OR highlight and <PICK>...

  • Page 91: Sii Calculation In Insertion Gain

    User's Guide Version 3.12 © November 2015 ® Verifit Insertion gain NOTE: Because it is analyzed in 1/3 octave bands, the Noise stimulus produces a REAR up to 12 dB below that produced by the Swept stimulus at the same overall level. The REIGs will be similar except at levels which cause non-linear operation of the hearing instrument.
  • Page 92 User's Guide Version 3.12 © November 2015 ® Verifit 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. 5.

  • Page 93: 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 94: 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 95: Camfit In Speechmap

    User's Guide Version 3.12 © November 2015 ® Verifit 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. 4.

  • Page 96: Speechmap Setup

    User's Guide Version 3.12 © November 2015 ® Verifit To access Speechmap: press <Tests>, then highlight and <PICK> [On-ear measures] or [Test box • measures], then highlight and <PICK> [Speechmap]. To change screen setup: see On-Ear Measures Screen Setup, and On-ear or Test box mode. •...

  • Page 97: Screen Tour - Unaided Screen

    User's Guide Version 3.12 © November 2015 ® Verifit 2. To remove a checked stimulus from the list, highlight and <PICK> the stimulus you want to remove. You can also choose to have the envelopes of the speech test results automatically hidden (leaving only the LTASS) when you start another test.

  • Page 98: Screen Tour - Aided Screen

    User's Guide Version 3.12 © November 2015 ® Verifit Screen tour - aided screen On-ear or Test box mode The Speechmap environment provides two hearing instrument verification options: On-ear measures and Test box measures. Using on-ear mode, 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 99: Sii Calculation In Speechmap

    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...
  • Page 100 ® Verifit 2. Format the USB stick for data using the Audioscan Updater. 3. Create digital sound files that are compatible with Speechmap (see Creating WAV files for Speechmap). 4. Copy the WAV files from the PC to the top level directory (i.e. not in any folder) of the USB stick.

  • Page 101: Creating Wav Files For Speechmap

    User's Guide Version 3.12 © November 2015 ® Verifit Removing the USB stick while a Test post is open may cause unexpected behavior. Close the Test post • before removing the USB stick from the Verifit. 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.
  • Page 102 User's Guide Version 3.12 © November 2015 ® Verifit Example of user-supplied files, “user.wav”, “user_-4.wav” and “user_+2.5.wav”.

  • Page 103: Speechmap Fitting Procedures

    Measures - Setup, On-Ear Measures - Setup, On-Ear Measures Screen Setup and Speechmap. Assessment data entry Threshold data and parameters may be entered by scanning a barcode on a previous Audioscan printout or manually using a mouse, the keypad or the numeric keypad on an external keyboard. See Mouse, keyboard, barcode scanner, and Input device operation.

  • Page 104: Assessment Data Choices

    User's Guide Version 3.12 © November 2015 ® Verifit Assessment data choices The following audiometric assessment parameters can be specified in the Speechmap Audiometry setup box. Defaults are the last-used choices if test setup memory has been turned on. See Saving test setup. 1.

  • Page 105: Fitting To Targets For Soft Speech

    User's Guide Version 3.12 © November 2015 ® Verifit ABR (nHL). Select from [Default, Enter]. If [Enter] is selected, an entry screen will be provided after threshold data have been entered. Otherwise default factors will be used. These may be set to DSL values or to values that you have entered in Setup.

  • Page 106: Fitting To Targets For Loud Sounds

    User's Guide Version 3.12 © November 2015 ® Verifit Fitting to targets for loud sounds 4. Select Test 2 & set stimulus to [MPO]. In test box mode, 90 dB tone bursts are presented at 1/3 octave frequencies in a repeating sequence. In on-ear mode, a single sequence of 85 dB tone bursts is presented when you press <Continue>.

  • Page 107: Open Fittings In Speechmap

    User's Guide Version 3.12 © November 2015 ® Verifit 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 108 User's Guide Version 3.12 © November 2015 ® Verifit sufficiently to raise them above threshold. In this case, the high frequency components may be shifted to a lower frequency with a better hearing threshold where the available gain will render them audible. Four modified versions of the Speech-std (1) test stimulus (Speech3150, Speech4000, Speech 5000 and Speech6300) are provided in Speechmap to assist in verifying and adjusting frequency lowering devices.

  • Page 109: Fm Fitting And Verification

    User's Guide Version 3.12 © November 2015 ® Verifit 7. Select Test 2 and select the same stimulus and stimulus level used in Test 1. 8. Press <Continue> to measure and store the long-term signal-averaged result. 9. The isolated band should now appear at a lower frequency and should reach or exceed threshold at its new location as shown below.

  • Page 110: Cros Fitting In Speechmap

    User's Guide Version 3.12 © November 2015 ® Verifit 2. Highlight and <Pick> Test 1 and choose Speech-std(1), (2) or the ISTS at a Level of 65 dB. Press <Continue> 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.

  • Page 111: T-Loop Fitting And Verification In Speechmap

    User's Guide Version 3.12 © November 2015 ® Verifit 3. Select Test 1 and record a response using [Pink noise] at Soft (55). It should be like a normal REUR. If not, the ear may not be fully open. 4. Position the speaker at 45 degress to the poor ear. 5.
  • Page 112 User's Guide Version 3.12 © November 2015 ® Verifit 4. Change the level to T-Loop (65). This will result in a T-Loop signal equivalent to a 65 dB SPL acoustic stimulus. 5. Press <Continue> to measure and store the long-term averaged result. The result can be directly compared against a 65 dB acoustic response, as shown below.
  • Page 113 User's Guide Version 3.12 © November 2015 ® Verifit specification (70dB SPL = 100 mA/m) and the ANSI specification (60 dB SPL = 31.6 mA/m).

  • Page 114: Speechmap Technical Details

    User's Guide Version 3.12 © November 2015 ® Verifit 20 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 115: Microphone Location Effects

    User's Guide Version 3.12 © November 2015 ® Verifit spectrum is from Cornelisse et al (1991) adjusted to a 1 m reference. 1/3 octave band SPL Add to band SPL for Speech ICRA Pink Loud Noise Noise Voice Chest Boom Standard ISTS Female...

  • Page 116: Deep Insertion Compensation

    User's Guide Version 3.12 © November 2015 ® Verifit 1600 2000 -4.0 2500 -3.0 3150 -0.4 -2.0 4000 5000 10.4 12.7 6300 8000 -1.6 -0.4 Microphone location effects are added after the overall rms level has been set Note: Microphone location effects remeasured 2014 on KEMAR and referenced to sub-lobe position. Software versions prior to 3.10.56 use MLE values from DSL 4.1 so slight changes in Test box Speechmap should be expected.

  • Page 117: Viewport

    User's Guide Version 3.12 © November 2015 ® Verifit 21 Viewport Viewport combines four of Verifit’s digital hearing instrument verification tests (Speechmap, Directional, Noise Reduction and Feedback) into a single-screen diagnostic and fitting suite. This screen is available in either Test Box or On-Ear mode, and is preset with default procedures and input stimuli for each test to optimize efficiency.

  • Page 118: Accessing Viewport Tests

    User's Guide Version 3.12 © November 2015 ® Verifit Accessing Viewport tests 1. Press <Tests>, then highlight and <PICK> [Viewport]. 2. Highlight and <PICK> [Test box] to prefit a hearing instrument and pre-verify the functions of key digital features prior to fitting; highlight and <PICK> [On-ear] to perform on-ear fitting, demonstrate digital functions and counsel patients.

  • Page 119: Viewport Test Box Directional Test

    User's Guide Version 3.12 © November 2015 ® Verifit 9. Press <Continue> to close [Audibility ] and move to [Directional]. Viewport Test box directional test 1. On the Viewport Test box screen, highlight and <PICK> [Directional]. 2. Position the hearing aid in the test box. See Coupling the hearing instrument, Directional ITE positioning, Directional BTE positioning, Test box directional procedure.
  • Page 120 User's Guide Version 3.12 © November 2015 ® Verifit instrument will remain omni-directional and no separation will be observed. Press <Continue> to capture this directional test result and end the test. 7. Press <Continue> to close [Directional] and move to [Noise reduction]. 8.
  • Page 121 User's Guide Version 3.12 © November 2015 ® Verifit 4. Press <Continue> to capture the directional curves and end the test. 5. Highlight and <PICK> Test 2. This is like Test 1 but without the speech. If the directional response of the instrument is noise-adaptive, the curves will separate after 15 –...

  • Page 122: Viewport Test Box Feedback Test

    User's Guide Version 3.12 © November 2015 ® Verifit 6. Press <Continue> to close [Noise reduction] and move to [Feedback]. Viewport Test box feedback test 1. On the Viewport screen, highlight and <PICK> [Feedback]. 2. For Test box tests, connect the monitor headphones and position them, with the hearing aid, in the test box as shown in Feedback Suppression Test.

  • Page 123: Viewport On-Ear Feedback Test

    User's Guide Version 3.12 © November 2015 ® Verifit 4. When the test has finished, peaks should be apparent in one or both curves. 5. Without changing the setting of the monitor headset volume control, enable the hearing instrument’s feedback suppression and highlight and <PICK> Test 2. Allow the speech to run for a few seconds, then press <Continue>.
  • Page 124 User's Guide Version 3.12 © November 2015 ® Verifit 4. The effects of jaw movements and the presence of hands, hats and telephone handsets may be explored using these tests. 5. Press <Continue> to close [Feedback] and return to the Viewport screen.

  • Page 125: 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 126: Test Box High Distortion Or Noise

    User's Guide Version 3.12 © November 2015 ® Verifit Test box high distortion or noise High distortion and/or noise numbers in an ANSI test There may be a leak between the hearing instrument under test and the coupler it is connected to. For BTE •...

  • Page 127: Test Box Speaker Overdriven

    If any have been pushed back into the connector, you should contact Audioscan. Unplug the test box reference microphone and plug the on-ear probe microphone in its place. Try test box •...

  • Page 128: Invalid On-Ear Calibration

    User's Guide Version 3.12 © November 2015 ® Verifit This message may be displayed when starting an On-ear test. It indicates that the Verifit 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 of the side (Right or •...

  • Page 129: Invalid Recd Real Ear Measurement

    User's Guide Version 3.12 © November 2015 ® Verifit This message may be displayed during the coupler calibration for the RECD transducer. It indicates that the calibration is significantly different from normal which may cause significant error while fitting. Check that the RECD transducer is connected. •...
  • Page 130 User's Guide Version 3.12 © November 2015 ® Verifit If your scanner has a Unitech logo, scan the following barcode to reset the scanner to its default settings.
  • Page 131 User's Guide Version 3.12 © November 2015 Verifit ®...

  • Page 132: Technical Specifications

    User's Guide Version 3.12 © November 2015 Verifit ® 23 Technical Test Stimuli.....tone, tone burst, pink noise, ....dual-direction noise,calibrated or live speech Test stimulus levels..40 to 90 dB SPL in 5 dB steps Specifications Test stimulus levels (inductive).31.6mA/m(ANSI S3.22) Test stimulus distortion....<2% at 90dB SPL Specifications subject to change without notice .............<0.5% at 70 dB SPL Test stimulus accuracy at reference mic.
  • Page 133 User's Guide Version 3.12 © November 2015 Verifit ® Frequency Range........200 to 8000 Hz Test Stimuli..frequency-modulated tone, tone burst, .pink noise, dual-direction noise, calibrated or live speech Freq. modulation....sawtooth ±3% over 128 ms Stimulus levels for tones.40 - 85 dB SPL in 5 dB steps Test stimulus accuracy at reference mic.
  • Page 134 User's Guide Version 3.12 © November 2015 ® Verifit...

  • Page 135: Glossary

    User's Guide Version 3.12 © November 2015 ® Verifit 24 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"). AGRAM, Abbreviation for audiogram.
  • Page 136 User's Guide Version 3.12 © November 2015 ® Verifit 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 137 User's Guide Version 3.12 © November 2015 ® Verifit 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 138 User's Guide Version 3.12 © November 2015 ® Verifit 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 139 User's Guide Version 3.12 © November 2015 ® Verifit 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 140: 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 141 User's Guide Version 3.12 © November 2015 ® Verifit 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 142 User's Guide Version 3.12 © November 2015 ® Verifit 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 143: Manufacturer Disclosure Statement For Medical Device Security

    User's Guide Version 3.12 © November 2015 ® Verifit 26 Appendix 1 Manufacturer Disclosure Statement for Medical Device Security...
  • Page 144 User's Guide Version 3.12 © November 2015 ® Verifit...
  • Page 145 User's Guide Version 3.12 © November 2015 ® Verifit...

  • Page 146: Audionote 2.1 Verifit And Rm500Sl Test Signals And Analysis

    User's Guide Version 3.12 © November 2015 ® Verifit 27 Appendix 2 AudioNote 2.1 VERIFIT and RM500SL Test Signals and Analysis For additional details of the signals and their analysis, see the appended AudioNote.
  • Page 147 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 148 ± 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 149 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 150 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 151 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 152 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 153 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 154 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 155 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 156 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 157 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 158 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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