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Frye FONIX 6500-CX Workbook

Hearing aid test system electronics module. testing fm system
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T
E
FM SYSTEMS
with the FONIX 6500-CX
Hearing Aid Analyzer
(Requires software version 4.20 or above)
FRYE
S
T
FRYE ELECTRONICS, INC.
P.O. Box 23391 • Tigard, OR 97281-3391
(503) 620-2722 • (800) 547-8209
Fax: (503) 639-0128
www.frye.com • e-mail: sales@frye.com
I
N
G

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  • Page 1 FM SYSTEMS with the FONIX 6500-CX Hearing Aid Analyzer (Requires software version 4.20 or above) FRYE ELECTRONICS, INC. P.O. Box 23391 • Tigard, OR 97281-3391 (503) 620-2722 • (800) 547-8209 Fax: (503) 639-0128 FRYE www.frye.com • e-mail: sales@frye.com...
  • Page 2 Contents Introduction ............... . 1 General Fitting Protocol .
  • Page 3 1.6.5 Test FM+ENV microphones with typical input to FM microphone — EFE80 ..37 1.6.6 Test environmental mic response with typical input — EEF65 ....38 1.6.7 Test aid with high-level input —...

  • Page 4: Introduction

    Introduction This workbook contains procedures for testing FM systems with the 6500-CX hearing aid analyzer using coupler and real-ear measurement methods. An FM system consists of two main parts: a transmitter and a receiver. The transmitter microphone can come in many dif- ferent sizes and shapes, and it can be omni-directional or directional.

  • Page 5: General Fitting Protocol

    General Fitting Protocol For the purposes of this workbook, we will assume that the hearing aid being tested has been fitted appropriately for the client’s loss. We will adjust the FM system to the output of the hearing aid. Goals: •...

  • Page 6: Arrangement Of This Workbook

    • The numbers at the end indicate the sound pressure level of the test signal used. Examples: – EHA65 is the electroacoustic coupler measurement of the hearing aid with the signal input at 65 dB SPL – EFM80 is the electroacoustic coupler measurement of the FM microphone with the sig- nal input at 80 dB SPL –...

  • Page 7: Coupler Setup In The Sound Chamber

    FM receiver boot, or options for coupling to the personal BTE hearing aid via direct audio inputs, silhouette coils, or neck loops. This section contains a description of how to arrange the 2-cc coupler with each type of output device. Testing FM Systems with FONIX 6500-CX Analyzers...
  • Page 8 Receiver Receiver Receiver Foam Pad Foam Pad Foam Pad to Analyzer to Analyzer to Analyzer Figure 1.1.1A Figure 1.1.1B Figure 1.1.1C Button earphone Internal FM receiver Silhouette coil External FM boot receiver Direct audio input Button earphone (Figure 1.1.1A) Remove the ear-level adapter from the HA-2 coupler, if necessary. Snap on the button earphone to the HA-2 coupler.
  • Page 9 4. While holding the coupler in hand, place the hearing aid at the listener’s ear, as typi- cally worn. 5. Take care not to move or touch the coupler microphone while testing. FM Receiver to Analyzer Figure 1.1.1D Neck loop Testing FM Systems with FONIX 6500-CX Analyzers...

  • Page 10: Hearing Aid Setup

    1.1.2 Hearing Aid Setup Make sure the sound chamber is leveled. Attach the hearing aid, set to user settings, to the HA-2 coupler in the usual way. Be sure the FM transmitter is off and the aid is set to receive the signal from the hearing aid microphone.
  • Page 11 Otherwise, take a shoebox, line it with packing foam, and place the environmental microphone inside, covering it with some more foam. See Figure 1.1.3B. This should isolate the room noise from the environmental micro- phone. Testing FM Systems with FONIX 6500-CX Analyzers...

  • Page 12: Environmental Microphone Setup

    Shoebox lined with foam Isolate environmental microphone FM mic Figure 1.1.3B Isolating the environmental microphone 1.1.4 Environmental Microphone Setup Environmental microphones on ear-level FM receivers Make sure the sound chamber is leveled. Attach the ear-level FM receiver to the HA-2 coupler and set it to receive input from the environmental microphone only.
  • Page 13 5. Close and latch the lid of the sound chamber. 6. You are now ready to test the FM system with the signal delivered to the environ- mental microphone. Figure 1.1.4 Testing lapel receivers Testing FM Systems with FONIX 6500-CX Analyzers...

  • Page 14: Omni-Directional: Fm-Only

    1.2 Omni-directional: FM-only This section contains a description of the four different coupler measurements of FM systems when the client primarily uses the system in FM-only mode. These measurements are: • EHA65: typical electroacoustic response of the aid • EFM80: typical electroacoustic response of the FM transmitter/receiver •...

  • Page 15: Test Fm Microphone With Typical Input — Efm80

    If you don’t have the Multi-Curve Option, press [CRT] to print out EFM80 and com- pare it to EHA65. Figure 1.2.2 Comparison of EHA65 (CRV2), the hearing aid response at 65 dB SPL and EFM80 (CRV1), the FM response at 80 dB SPL Testing FM Systems with FONIX 6500-CX Analyzers...

  • Page 16: Test Aid Alone With High-Level Input — Eha90

    5. If you have a client with a mild to moderate hearing loss (less than 80 dB HL), the output of the two curves should be within 5 dB of each other. If you have a client with a severe to profound loss (greater than 80 dB HL), the output of EFM80 should be 7-10 dB higher than the output of EHA65.

  • Page 17: Test Fm System With High-Level Input — Efm90

    If necessary, use [<, >] to display CRV 1 in the first slot. This curve is EFM90. Use [∨] to select the second slot. If necessary, use [<, >] to display CRV 2 in the second slot. This curve is EHA90. Testing FM Systems with FONIX 6500-CX Analyzers...
  • Page 18 g. You may want to press [∨] and [FREEZE] to turn off the display of CRV 3, since it is not relevant to this comparison. Similarly, press [∨] and [FREEZE] again to turn off the display of CRV 4. If you don’t have the Multi-Curve Option, press [CRT] to print out EFE90 and com- pare it to EHA90.

  • Page 19: Omni-Directional: Fm+Env

    3. Press [SINE/COMPOSITE] to put the analyzer in PURE TONE MODE. 4. If necessary, use [<, >] to adjust the frequency of the single tone signal to 1000 Hz. Figure 1.3.1 Hearing aid output at 65 dB SPL at 1000 Hz Testing FM Systems with FONIX 6500-CX Analyzers...

  • Page 20: Single Frequency Output Of Omni-Directional Fm Mic At 65 Db Spl

    5. Use [∨] to adjust the level of the signal to 65 dB SPL. Make a note of the AID OUT on the screen. This is the HEARING AID OUTPUT. See Figure 1.3.1. 1.3.2 Single frequency output of omni-directional FM mic at 65 dB SPL 1.

  • Page 21: Test Fm+Env Microphones With Typical Input To Fm Microphone — Efe80

    If necessary, use [<, >] to display CRV 1 in the first slot. This curve is EFE80 or the Electroacoustic FM and Environmental Response with 80 dB input to the FM microphone. Use [∨] to select the second slot. Testing FM Systems with FONIX 6500-CX Analyzers...
  • Page 22 If necessary, use [<, >] to display CRV 2 in the second slot. This curve is EHA65. If you don’t have the Multi-Curve Option, press [CRT] to print out EFE80 and com- pare it to EHA65. Figure 1.3.5 Comparison of EHA65 (CRV2), the hearing aid response at 65 dB SPL and EFM80 (CRV1), the FM response at 80 dB SPL 5.

  • Page 23: Test Environmental Microphone Response With Typical Input—Eef65

    EHA65 and EEF65 should be similar, and the EFE80 should be 7-10 dB higher. See Figure 1.3.6. Figure 1.3.6 Comparison of EHA65 (CRV1), EFM80 (CRV2), and EEF65, the environmental microphone response at 65 dB SPL Testing FM Systems with FONIX 6500-CX Analyzers...

  • Page 24: Test Aid Alone With High-Level Input — Eha90

    1.3.7 Test aid alone with high-level input — EHA90 Turn off the FM signal, and set up the hearing aid for testing as described in Section 1.1.2. 2. Press [SINE/COMPOSITE] button to enter Pure Tone Mode. The analyzer will auto- matically set itself to a signal level of 90 dB SPL.
  • Page 25 As a last resort, adjust the settings on the hearing aid. If this must be done, the teacher, parents, and therapists must be made aware that when the FM system is used, the settings on the hearing aid must be changed for optimum performances. See Figure 1.3.8. Testing FM Systems with FONIX 6500-CX Analyzers...

  • Page 26: Test Environmental Mic Response With High-Level Input — Eef90

    1.3.9 Test environmental mic response with high-level input — EEF90 Set up the environmental microphone for testing as described in Section 1.1.4. Set the FM receiver to FM+ENV. 2. Press [START/STOP] to run a pure-tone measurement at 90 dB SPL. This measurement will be referred to as EEF90 or the Electroacoustic FM and Environmental Response with 90 dB SPL input to the environmental microphone.

  • Page 27: Coupler Setup In The Sound Field

    5. Remove the reference microphone and the platform from the floor stand, leaving the floor stand in its position in front of the sound field speaker. 6. Attach the hearing aid to the HA-2 coupler. Testing FM Systems with FONIX 6500-CX Analyzers Testing FM Systems with FONIX FP40 Analyzers...
  • Page 28 7. Thread a probe tube through the black probe tube adapter with the tube first enter- ing the ridged end of the adapter. The tube should extend 1-2 mm past the other end of the adapter. Use Fun-Tak to secure the probe tube to the adapter. See Figure 1.4.1B.

  • Page 29: Fm System Setup

    3. Insert the adapter into the HA-2 coupler, and attach the probe tube to the probe microphone. See Figure 1.4.1C. 4. Attach the FM receiver to the HA-2 coupler as described in Section 1.1.1. Testing FM Systems with FONIX 6500-CX Analyzers...
  • Page 30 Place the assembly 2 ft (60 cm) from the transmitting microphone, out of the sound field of the speaker. See Figure 1.4.2. Stand clear of the test area, holding the remote module. You are now ready to test the FM transmitter/receiver. Reference mic (not used) FM mic...

  • Page 31: Environmental Microphones On Body-Worn Receivers

    6. Press [LEVEL] on the remote module. This levels the test signal at the place where the FM receiver microphone will be during testing. 7. Leave the reference microphone in place during testing. Testing FM Systems with FONIX 6500-CX Analyzers...
  • Page 32 Thread the probe tube through the probe tube adapter so that it extends 3 mm past the end. Use Fun-Tak to hold the probe tube in place. See Figure 1.4.1B. Insert the adapter and probe tube (attached to the probe microphone) into the HA-2 coupler, and attach to the button earphone, direct audio input hearing aid, or aid coupled with neck loop or silhouette, as explained in Section 1.1.

  • Page 33: Directional: Testing Fm-Only

    EHA65—the hearing aid response at 65 dB SPL 6. Look in the bottom left corner of your screen. If it says AUTO, press [UNAIDED] on the remote module. This will put you in MANUAL Mode. Testing FM Systems with FONIX 6500-CX Analyzers...

  • Page 34: Test Fm Microphone With Typical Input — Efm80

    7. Press [MENU] to enter the SPL Menu. Select COMP for AIDED CURVE 1 and AIDED CURVE 2. 9. Press [MENU] to return to the SPL Test Screen. 10. If necessary, select CRV 1 with [∧]. 11. Use [<, >] to select a source level of 65 dB SPL. 12.

  • Page 35: Test Aid Alone With High-Level Input — Eha90

    3. Select PURE TONE for AIDED CURVE 1 and AIDED CURVE 2. 4. Press [MENU] to return to the SPL Test Screen. 5. Press [∧] to select CRV 1. Figure 1.5.3 EHA90—the hearing aid response at 90 dB SPL Testing FM Systems with FONIX 6500-CX Analyzers...

  • Page 36: Test Fm System With High-Level Input — Efm90

    6. Use [>] to select a source level of 90 dB SPL. Press [START/STOP] to begin the sweep. This response will be referred to as the Electroacoustic Hearing Aid Saturation Response or EHA90. See Figure 1.5.3. 1.5.4 Test FM system with high-level input — EFM90 1.

  • Page 37: Directional: Testing Fm+Env

    3. Use [∨] to highlight MODE. 4. Use [<, >] to select PURE TONE. 5. Press [MENU] to exit from the Quik-Probe II Menu. Figure 1.6.1 Hearing aid output at 65 dB SPL at 1000 Hz Testing FM Systems with FONIX 6500-CX Analyzers...

  • Page 38: Single Frequency Output Of Fm Mic At 65 Db Spl

    6. Press [START/STOP] to begin a single frequency signal. If necessary, use [<, >] to adjust the frequency to 1000 Hz. 8. Use [∨, ∧] to adjust the signal level to 65 dB SPL. Note the MIC OUT on the screen. This is the HEARING AID OUTPUT. See Figure 1.6.1.

  • Page 39: Test Aid With Typical Input — Eha65

    9. Press [MENU] to return to the SPL Test Screen. 10. If necessary, select CRV 1 with [∧]. 11. Use [<, >] to select a source level of 65 dB SPL. Figure 1.6.4 Hearing aid response at 65 dB SPL Testing FM Systems with FONIX 6500-CX Analyzers...

  • Page 40: Test Fm+Env Microphones With Typical Input To Fm Microphone — Efe80

    12. Press [START/STOP] to begin the measurement. 13. Press [START/STOP] once the measurement has stabilized. This curve is the Electroacoustic Hearing Aid Response or EHA65. See Figure 1.6.4. 1.6.5 Test FM+ENV microphones with typical input to FM microphone — EFE80 1.

  • Page 41: Test Environmental Mic Response With Typical Input — Eef65

    CRV 3 should be EEF65. For a successful fit, EHA65 and EEF65 should be similar, and EFE80 should be 7-10 dB higher. See Figure 1.6.6. Figure 1.6.6 Comparison of EHA65 (CRV1), EFM 80 (CRV2), and EEF65 (CRV), the environmental microphone response at 65 dB SPL Testing FM Systems with FONIX 6500-CX Analyzers...

  • Page 42: Test Aid With High-Level Input — Eha90

    1.6.7 Test aid with high-level input — EHA90 Set up the hearing aid for testing in the sound field by following the directions found in the hearing aid setup in Section 1.4.1. If you’ve already leveled the sound field speaker, you can skip to step 6 in that section. Press [MENU] to enter the SPL Menu.

  • Page 43: Test With Fm System Using A High-Level Input — Efe90

    Figure 1.6.8 Comparison of EHA90 (CRV1), the hearing aid response at 90 dB SPL with EFM90 (CRV2), the FM response at 90 dB SPL Testing FM Systems with FONIX 6500-CX Analyzers...

  • Page 44: Test Environmental Mic Response With High-Level Input — Eef90

    1.6.9 Test environmental mic response with high-level input — EEF90 Set up the environmental microphone for testing as described in Section 1.4.3. Set the FM receiver to FM+ENV. If the sound field speaker is already leveled, you don’t have to re-level it. 2.

  • Page 45: Setup

    2. Place the wedge style earhook on the client’s ear. Reference Mic Reference Mic Probe Mic 12" 12" Probe Mic Speaker Speaker (45 degrees) (45 degrees) Top View Front View Figure 2.1.1 Hearing aid setup Testing FM Systems with FONIX 6500-CX Analyzers...

  • Page 46: Fm System

    Put the reference microphone on the wedge above the client’s ear so that it points towards the sound field speaker. See Figure 2.1.1. Press [LEVEL] on the remote module. This will level the sound field speaker. Mark the probe tube to ensure the desired insertion depth, and place it into the client’s ear.

  • Page 47: Setup For Testing Environmental Microphones

    If the client uses an environmental microphone with his FM system, it is important to test it to make sure that its response matches that of the client’s hearing aid. This section describes several different methods for setting up an environmental microphone for testing. Testing FM Systems with FONIX 6500-CX Analyzers...

  • Page 48: Environmental Microphones On Body-Worn Receivers

    Environmental microphones on body-worn receivers Arrange the reference microphone and FM receiver environmental microphone as described in Section 1.4.3. The FM receiver will be six inches from and facing the loudspeaker. Choose a place to stand during testing, preferably away from the loudspeaker and microphone.

  • Page 49: Testing Fm-Only

    6. Press [START/STOP] twice. This will open the SPL Test Screen. 7. Make sure that the bottom left corner of your screen says MANUAL. If it says AUTO, press [UNAIDED] to change it to MANUAL. Testing FM Systems with FONIX 6500-CX Analyzers...

  • Page 50: Test Fm System With Typical Input — Rfm80

    8. Press [MENU] to enter the SPL Menu. 9. Select COMPOSITE for AIDED CURVE 1 and AIDED CURVE 2 using the arrow keys. 10. Press [MENU] to return to the SPL Test Screen. 11. If necessary, use [∧] to select CRV 1. 12.

  • Page 51: Test Aid With High-Level Input—Rha90

    5. Follow the instructions found in Section 2.1.1 to set the client up for a real-ear hear- ing aid measurement and level the sound field. Figure 2.2.3 RHA90-real-ear saturation response of the hearing aid Testing FM Systems with FONIX 6500-CX Analyzers...

  • Page 52: Test Fm System With High-Level Input—Rfm90

    6. If necessary, use [∨, ∧] to select CRV 1. 7. Use [>] to adjust the source level to 90 dB SPL. 8. Press [START/STOP] to take the measurement. 9. This curve will be referred to as the Real-Ear Hearing Aid Saturation Response or RHA90.

  • Page 53: Testing Fm+Env

    3. Set up the client for a normal real-ear measurement as described in Section 2.1.1. Make sure to level the sound field speaker. Figure 2.3.1 Hearing aid output with 65 dB SPL signal at 1 kHz Testing FM Systems with FONIX 6500-CX Analyzers...

  • Page 54: Single Frequency Response Of Fm Mic At 65 Db Spl

    4. Press [MENU]. 5. Highlight MODE with [∨, ∧]. 6. Select PURE TONE with [<, >]. 7. Highlight GAIN(G)/SPL with [∨]. 8. Select G/REF OFF with [<, >]. Press [MENU] to return to the Insertion Gain Screen. 10. If necessary, use [<, >] to set the FREQUENCY to 1000 Hz in the CURRENT STATUS box.

  • Page 55: Test Aid With Typical Input – Rha65

    8. Press [MENU] to return to the SPL Test Screen. 9. If necessary, use [∧] to select CRV 1. 10. Adjust the source level of CRV 1 to 65 dB SPL using [<, >]. Testing FM Systems with FONIX 6500-CX Analyzers...

  • Page 56: Test Fm System With Typical Input – Rfm80

    11. Press [START/STOP] to begin the measurement and again when a stable response is observed.. 12. This curve will be referred to as the Real-Ear Hearing Aid Response or RHA65. See Figure 2.3.4. 2.3.5 Test FM system with typical input – RFM80 Set up the FM system following the instructions found in Section 2.3.1.

  • Page 57: Test Environmental Mic With Typical Input—Ref65

    6. Compare RHA65 (CRV 1) to RFE80 (CRV 2) and REF65 (CRV 3). RHA65 and REF65 should be similar while RFE80 should give a 7-10 dB advantage. See Figure 2.3.6. Figure 2.3.6 Comparison of RHA65 (CRV 1), RFE80 (CRV 2), and REF65 (CRV 3) Testing FM Systems with FONIX 6500-CX Analyzers...

  • Page 58: Test Aid With High-Level Input—Rha90

    2.3.7 Test aid with high-level input—RHA90 1. Set the client and hearing aid up for real-ear testing as described in Section 2.3.1. Make sure to level the sound field speaker. 2. From the SPL Test Screen, press [MENU]. 3. Select PT_BURST for AIDED CURVE 1, AIDED CURVE 2, and AIDED CURVE 3. 4.

  • Page 59: Test Fm System With High-Level Input—Rfe90

    For mild to moderate losses it is usually acceptable if the RFM90 is 5-10 dB below RHA90. Figure 2.3.8 Comparison of RHA90 (CRV 1) and RFE90 (CRV 2) Testing FM Systems with FONIX 6500-CX Analyzers...

  • Page 60: Test Environmental Mic With High-Level Input—Ref90

    2.3.9 Test environmental mic with high-level input—REF90 Set up the equipment as described in Section 2.1.3 of this guide for real-ear testing of environmental microphones. Make sure to level the sound field speaker. Press [∨] to select CRV 3. 3. Use [<, >] to adjust the source level of CRV 3 to 90 dB SPL. 4.

  • Page 61: Glossary

    Real-Ear FM and Environmental Response with 65 dB SPL input to the Environmental microphone RFE90 Real-Ear FM and Environmental Response with 90 dB SPL input to the FM microphone REF90 Real-Ear FM and Environmental Response with 90 dB SPL input to the Environmental microphone Testing FM Systems with FONIX 6500-CX Analyzers...
  • Page 62 Gallaudet University. The procedures given in this guide do not necessarily reflect the rec- ommendations of these audiologists; Frye Electronics, Inc. is solely responsible for the con- tents of this guide. Frye Electronics, Inc. also thanks Phonak, Telex, Comtek, and Phonic Ear for providing the equipment used in developing this guide.
  • Page 63 Testing FM Systems with FONIX 6500-CX Analyzers...

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