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TTEEMM CCoonnssuullttiinngg,, LLPP
© Copyright 2003 TEM Consulting, LP - All Rights ReservedPresentation To ATIS HAC Incubator Rev – 07/21/03 - HSB
Overview ofANSI C63.19
-
Wireless Hearing Aid Compatibility
Stephen BergerTEM Consultingwww.temconsulting.com
(512) [email protected]
TTEEMM CCoonnssuullttiinngg,, LLPP
© Copyright 2003 TEM Consulting, LP - All Rights ReservedPresentation To ATIS HAC Incubator Rev – 07/21/03 - HSB
•Background & History
•Overview of ANSI C63.19
•Possible Actions
TTEEMM CCoonnssuullttiinngg,, LLPP
© Copyright 2003 TEM Consulting, LP - All Rights ReservedPresentation To ATIS HAC Incubator Rev – 07/21/03 - HSB
TECHNICAL ISSUES
FOR MICROPHONE & T-COIL MODE Match Hearing Aid Immunity with Mobile
Handset Emissions
FOR T-COIL MODE only: Provide sufficient T-Coil Signal Strength and Signal Quality
TTEEMM CCoonnssuullttiinngg,, LLPP
© Copyright 2003 TEM Consulting, LP - All Rights ReservedPresentation To ATIS HAC Incubator Rev – 07/21/03 - HSB
HISTORY‘Hear It Now’ Petition Filed - Fall ’95FCC Summit - 1996IEC 118-13 & Australian Project Approved - 1996ANSI User Project Approved - Aug. ’96Oklahoma U. Objective & Subjective Study - Summer ’00IEC Harmonization Effort - Dec. ’99WAC Petition - Dec. ’00ANSI C63.19 Approved - Jan. ’01Revision for 3G & GTEM Approved - Feb. ’01FCC NPRM - Jan. ’02FDA Adopts ANSI C63.19 - Sept. ’02 (standard included in requirements for middle ear devices)FCC Rulemaking - July.’03ATIS HAC Incubator Formed - July ‘03
TTEEMM CCoonnssuullttiinngg,, LLPP
© Copyright 2003 TEM Consulting, LP - All Rights ReservedPresentation To ATIS HAC Incubator Rev – 07/21/03 - HSB
Project Scope
•Methods of Measurement and
• Parametric Criteria for:
• Hearing Aid Compatibility (HAC) with
• Wireless Communication Devices
TTEEMM CCoonnssuullttiinngg,, LLPP
© Copyright 2003 TEM Consulting, LP - All Rights ReservedPresentation To ATIS HAC Incubator Rev – 07/21/03 - HSB
Standard Title
American National Standard for Methods of Measurement
of Compatibility between Wireless Devices and Hearing Aids
ANSI C63.19-2001
TTEEMM CCoonnssuullttiinngg,, LLPP
© Copyright 2003 TEM Consulting, LP - All Rights ReservedPresentation To ATIS HAC Incubator Rev – 07/21/03 - HSB
Standard Development• Well over two dozen meetings over three
years and untold hours of investigation – Laboratory tests using hearing impaired
volunteers– Laboratory tests showing the cell phone
effects on wide range of Hearing Aids
• Used the rigorous ANSI ASC C63 balloting process including a public review by ANSI
TTEEMM CCoonnssuullttiinngg,, LLPP
© Copyright 2003 TEM Consulting, LP - All Rights ReservedPresentation To ATIS HAC Incubator Rev – 07/21/03 - HSB
PROJECT PARTICIPATION
HEARING AID INDUSTRYSUB-TOTAL - 21 participants from 15 organizations
WIRELESS INDUSTRY
SUB-TOTAL - 44 participants from 14 organizationsOTHER ORGANIZATIONS
SUB-TOTAL - 25 participants from 16 organizations
TOTAL 90 participants from 45 organizations
TTEEMM CCoonnssuullttiinngg,, LLPP
© Copyright 2003 TEM Consulting, LP - All Rights ReservedPresentation To ATIS HAC Incubator Rev – 07/21/03 - HSB
Standard Development• Work in ANSI ASC C63 Subcommittee 8
(Medical EMC)– Over 50 members on task group at time of ballot
• Food and Drug Administration• Federal Communications Commission• Testing Laboratories• Hearing Aid/Cell Phone Manufacturers• Hearing Industries Association• Universities• Hearing Aid Research Organizations• Consultants
TTEEMM CCoonnssuullttiinngg,, LLPP
© Copyright 2003 TEM Consulting, LP - All Rights ReservedPresentation To ATIS HAC Incubator Rev – 07/21/03 - HSB
Overview of StandardSummary of Sections
– Sections 1-3 – Introductory Material
• Overview
–
Scope
–
Purpose
–
Organization of document
• References
• Definitions, acronyms, and abbreviations
TTEEMM CCoonnssuullttiinngg,, LLPP
© Copyright 2003 TEM Consulting, LP - All Rights ReservedPresentation To ATIS HAC Incubator Rev – 07/21/03 - HSB
Overview of StandardSummary of Sections
– Section 4 – Test of Phone RF Emissions
• Test equipment and facilities
• Test set-up and validation
• Near-field test procedure
TTEEMM CCoonnssuullttiinngg,, LLPP
© Copyright 2003 TEM Consulting, LP - All Rights ReservedPresentation To ATIS HAC Incubator Rev – 07/21/03 - HSB
Overview of StandardSummary of Sections
– Section 5 – Test of HA RF Immunity
• Test facilities and equipment
• Test set-up and validation
• RF immunity test procedure (Key element)
TTEEMM CCoonnssuullttiinngg,, LLPP
© Copyright 2003 TEM Consulting, LP - All Rights ReservedPresentation To ATIS HAC Incubator Rev – 07/21/03 - HSB
Hearing Aid ImmunityTest Setup
Frequency Analyzer
Pre-Amp
Ear Coupler
Microphone
Power Meter (Pin)
Power Meter (Pout)
Amplifier RF Generator Cell Phone Mod. Sim.
Directional Coupler
Audio Signal Generator
Electro-acoustic Transducer
Dipole Antenna
TTEEMM CCoonnssuullttiinngg,, LLPP
© Copyright 2003 TEM Consulting, LP - All Rights ReservedPresentation To ATIS HAC Incubator Rev – 07/21/03 - HSB
Overview of StandardSummary of Sections
– Section 6 – Test of Phone T-Coil Signal
• Test facilities and equipment
• Test configurations and set-up
• Test procedure for audio band magnetic field
TTEEMM CCoonnssuullttiinngg,, LLPP
© Copyright 2003 TEM Consulting, LP - All Rights ReservedPresentation To ATIS HAC Incubator Rev – 07/21/03 - HSB
Phone T-Coil SignalTest Setup
Antenna replacedwith Coaxial Connection
ProbeCoil
ReferenceBase Station
Simulator
InterfaceConnection
GraphicsRecorder
PowerSupply
SignalSource
Integrator
Anechoic chamber for RF and acoustic sheilding (optional)
1/3 Octave Bandpass
Filter
Controller
RMS VoltmeterHandset
Optional Power Supply allowed for baseband signal measurement only.It is not allowed for noise measurements.
NOTE:
(Shown in Axial Postion)
TTEEMM CCoonnssuullttiinngg,, LLPP
© Copyright 2003 TEM Consulting, LP - All Rights ReservedPresentation To ATIS HAC Incubator Rev – 07/21/03 - HSB
Overview of StandardSummary of Sections
– Section 7 – HA Performance Criteria
• Articulation weighting factor
• Audio coupling mode
• Audio band magnetic coupling mode
• Accessories and options
TTEEMM CCoonnssuullttiinngg,, LLPP
© Copyright 2003 TEM Consulting, LP - All Rights ReservedPresentation To ATIS HAC Incubator Rev – 07/21/03 - HSB
MANY POSSIBLE RF SOLUTIONS
HEARING AID IMMUNITY
HA
ND
SET
EM
ISSI
ON
S
USABLE GOOD EXCELLENT
USABLE GOOD EXCELLENT
USABLE GOOD EXCELLENT
Eliminated by FCC
Rulemaking
TTEEMM CCoonnssuullttiinngg,, LLPP
© Copyright 2003 TEM Consulting, LP - All Rights ReservedPresentation To ATIS HAC Incubator Rev – 07/21/03 - HSB
Section 7 –RF Performance Criteria
RF PARAMETERS
Category
Hearing Aid Parameters (Hearing Aid must maintain
< 55 dB IRIL interference level and < 6 dB Gain Compression) Telephone Parameters
NEAR FIELD E-Field Immunity (CW dB(V/m))
H-Field Immunity (CW dB(A/m))
E-Field Emissions (CW dB(V/m))
H-Field Emissions (CW dB(A/m))
Category U1 30.0 - 35.0 dB (V/m) -23.0 - -18.0 dB (A/m) 46 - 51 dB(V/m) + 0.5 x AWF -4.4 - 0.6 dB(A/m) + 0.5 x AWF
Category U2 35.0 - 40.0 dB (V/m) -18.0 - -13.0 dB (A/m) 41- 46 dB(V/m) + 0.5 x AWF -9.4 - -4.4 dB(A/m) + 0.5 x AWF
Category U3 40.0 - 45.0 dB(V/m) -13.0 - -8.0 dB (A/m) 36 - 41 dB(V/m) + 0.5 x AWF-14.4 - -9.4 dB(A/m) + 0.5 x AWF
Category U4 >45.0 dB (V/m) >-8.0 dB (A/m) <36 dB(V/m) + 0.5 x AWF <-14.4 dB(A/m) + 0.5 x AWF
Category UX special special special special
TTEEMM CCoonnssuullttiinngg,, LLPP
© Copyright 2003 TEM Consulting, LP - All Rights ReservedPresentation To ATIS HAC Incubator Rev – 07/21/03 - HSB
Section 7 –RF Performance Criteria
SYSTEM CLASSIFICATION
System ClassificationArticulation
Index U Category SumAI Sum of Hearing Aid (U Category) + Telephone (U
Category)
Usable 0.3 Hearing Aid (U Category) + Telephone (U Category) = 4Normal Use 0.5 Hearing Aid (U Category) + Telephone (U Category) = 5Excellent Performance 0.7 Hearing Aid (U Category) + Telephone (U Category) >= 6
TTEEMM CCoonnssuullttiinngg,, LLPP
© Copyright 2003 TEM Consulting, LP - All Rights ReservedPresentation To ATIS HAC Incubator Rev – 07/21/03 - HSB
Section 7 –T-Coil Requirements
• T-Coil Signal Strength
• T-Coil Signal Frequency Response
• T-Coil Signal Quality
TTEEMM CCoonnssuullttiinngg,, LLPP
© Copyright 2003 TEM Consulting, LP - All Rights ReservedPresentation To ATIS HAC Incubator Rev – 07/21/03 - HSB
Section 7.3.1 –T-Coil Signal Strength
5
1
2
3
4
3
1
MeasurementPlane
ReceiverAxis
Axial
MeasurementLocation
MeasurementRadial
Locations
(1,2,3,&4)
MeasurementRadius
10 mm
16 mm
R.M.
.
.
.
AXIALLocation
5
Secondary Auxiliary
Axis(Example)
Axial -13 dB (A/m) (.22 A/m)
Radial -18 dB (A/m)
(.13 A/m)
TTEEMM CCoonnssuullttiinngg,, LLPP
© Copyright 2003 TEM Consulting, LP - All Rights ReservedPresentation To ATIS HAC Incubator Rev – 07/21/03 - HSB
Section 7.3.2 –T-Coil Frequency Response
MAGNETIC FIELD STRENGTH RELATIVE TO 1000 Hz
-20
-10
0
10
20
300 500 1000 2000 3300FREQUENCY (Hz)
dB
Rel
ativ
e to
Val
ue
at 1
kH
z
-6 dB/Oct.
-4 dB/Oct.
6 dB/Oct.
+2 dB
-2 dB
TTEEMM CCoonnssuullttiinngg,, LLPP
© Copyright 2003 TEM Consulting, LP - All Rights ReservedPresentation To ATIS HAC Incubator Rev – 07/21/03 - HSB
Section 7.3.3 –T-Coil Signal Quality
MAGNETIC COUPLING PARAMETERSCategory Hearing Aid Parameters Telephone Parameters
Near Field Immunity (w / 27.8 dBm CW into Dipole)
WD Signal Quality (Signal+Noise-to-Noise Ratio in dB)
Category U1T 75 - 85 dB(IRIL) -10 - -20 dB + AWFCategory U2T 65 - 75 dB(IRIL) 0 - -10 dB + AWFCategory U3T 55 - 65 dB(IRIL) 10 - 0 dB + AWFCategory U4T <55 dB(IRIL) >10 dB + AWFCategory UXT special special
(NOTE: A comparable hearing aid immunty test can be performed byfixing the acoustic output power requirement at 75 dB(IRIL) for all categories and varying the power into the dipole from 22.8 dBm for category U0, increasing by +5 dB for each higher category.)
TTEEMM CCoonnssuullttiinngg,, LLPP
© Copyright 2003 TEM Consulting, LP - All Rights ReservedPresentation To ATIS HAC Incubator Rev – 07/21/03 - HSB
Overview of StandardSummary of Sections
– Section 8: Calibration and measurement uncertainty
• General
• Ambient conditions
• Specific calibration requirements
• Measurement uncertainty
TTEEMM CCoonnssuullttiinngg,, LLPP
© Copyright 2003 TEM Consulting, LP - All Rights ReservedPresentation To ATIS HAC Incubator Rev – 07/21/03 - HSB
Overview of StandardSummary of Sections
– Section 9 Test Report
• Test plan
• Applicable standards
• Equipment unit tested
• Test configuration
• List of test equipment
• Units of measurement
TTEEMM CCoonnssuullttiinngg,, LLPP
© Copyright 2003 TEM Consulting, LP - All Rights ReservedPresentation To ATIS HAC Incubator Rev – 07/21/03 - HSB
Overview of StandardSummary of Annexes
– Definition of reference axes
– Acoustic test frequencies
– Equipment and set-up calibration
– Test equipment specifications
– Sample measurement uncertainty estimates
– Use of Helmholtz coils for calibration
– RF envelope comparison for US Wireless Communications devices
– Explanation of rationale used in standard
– Alternate test method for RF immunity
TTEEMM CCoonnssuullttiinngg,, LLPP
© Copyright 2003 TEM Consulting, LP - All Rights ReservedPresentation To ATIS HAC Incubator Rev – 07/21/03 - HSB
Effectiveness of StandardOklahoma University Validation Studies
– Objective Study – 10 Phones / 8 HA
• Predicted Result– 38.8 % Excellent– 28.8% Recommended– 67.6% Recommended or Better
• Actual Result– 41.7 % Excellent– 26.4% Recommended– 68.1% Recommended or Better
– Test Accuracy
– 51.4% Exact Match– 93.1% Exact Match or Better Than Predicted
Performance
TTEEMM CCoonnssuullttiinngg,, LLPP
© Copyright 2003 TEM Consulting, LP - All Rights ReservedPresentation To ATIS HAC Incubator Rev – 07/21/03 - HSB
Effectiveness of StandardOklahoma University Validation Studies
– Subjective Study – 18 Subjects / 6 Phones
– Test Accuracy
• 6 Hearing Aids were good with all phones
• Some Hearing Aids were not acceptable with any phone
• There is a middle ground where a Hearing Aid / Phone combination must be tried by the user.
– Some users will find the combination perfectly acceptable
– Other users, with the same test results will find the combination unacceptable
TTEEMM CCoonnssuullttiinngg,, LLPP
© Copyright 2003 TEM Consulting, LP - All Rights ReservedPresentation To ATIS HAC Incubator Rev – 07/21/03 - HSB
GTEM – Dipole IlluminationTest Repeatability
(Max. Reading) – (Min. Reading) (dB)
900 MHz
GTEM Dipole Center Dipole TipT-Coil Mode 5.8 6.5 6.6Mic Mode 2.7 5.2 8.6
1900 MHz
GTEM Dipole Center Dipole TipT-Coil Mode 11.9 6.8 5.1Mic Mode 5.0
TTEEMM CCoonnssuullttiinngg,, LLPP
© Copyright 2003 TEM Consulting, LP - All Rights ReservedPresentation To ATIS HAC Incubator Rev – 07/21/03 - HSB
Considerations for Next Revision
Elimination of analog requirement.
Reduction in number of test positions for HA.Phone RF - Eliminate H-Field test
HA RF – Harmonize with IEC 60118-13
T-Coil – Change test positions
T-Coil – Develop isotropic probe
T-Coil – Implement FFT method for Freq. Resp.
T-Coil – Move to straight A-Weighted S/N
Move from parametric to end result based test
TTEEMM CCoonnssuullttiinngg,, LLPP
© Copyright 2003 TEM Consulting, LP - All Rights ReservedPresentation To ATIS HAC Incubator Rev – 07/21/03 - HSB
Summary A significant effort has been underway since 1995 to assure that hearing aid users could use digital wireless devices.
Both industries (cell phone and hearing aid) have made significant advances and have many products which work quite well together.
The ANSI C63.19 Standard provides compatibility.
Consensus recommendations with supporting technical data needed for the next edition of C63.19