Instructions for the WG ChairAt Each Meeting, the Working Group Chair shall:Show slides #1 and #2 of this presentationAdvise the WG membership that: The IEEE’s patent policy is consistent with the ANSI patent policy and is

described in Clause 6 of the IEEE-SA Standards Board Bylaws; Early disclosure of patents which may be essential for the use of standards

under development is encouraged; Disclosures made of such patents may not be exhaustive of all patents that

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Instruct the WG Secretary to record in the minutes of the relevant WG meeting:

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Any responses that were given, specifically the patents and patent applications that were identified (if any) and by whom.

(Not necessary to be shown) Approved by IEEE-SA Standards Board – March 2003 (Revised February 2006)

6. Patents

IEEE standards may include the known use of essential patents and patent applications provided the IEEE receives assurance from the patent holder or applicant with respect to patents whose infringement is, or in the case of patent applications, potential future infringement the applicant asserts will be, unavoidable in a compliant implementation of either mandatory or optional portions of the standard [essential patents]. This assurance shall be provided without coercion. The patent holder or applicant should provide this assurance as soon as reasonably feasible in the standards development process. This assurance shall be provided no later than the approval of the standard (or reaffirmation when a patent or patent application becomes known after initial approval of the standard). This assurance shall be either:

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IEEE-SA Standards Board Bylaws on Patents in Standards

Slide #1 Approved by IEEE-SA Standards Board – March 2003 (Revised February 2006)

Inappropriate Topics for IEEE WG Meetings

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This slide set is available at http://standards.ieee.org/board/pat/pat-slideset.ppt

Slide #2

Approved by IEEE-SA Standards Board – March 2003 (Revised February 2006)

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Literature Review7.2 Audio coupling mode

“… audio signal-to-interference ratio of 20 dB provides a signal quality that is acceptable for normal operation …” [B41] (= M3)“At a signal-to interference ratio of 30 dB, 90% of hearing aid users find the WD highly usable” (= M4)“… reduction of the signal-to-interference ratio to 10 dB degrades the performance to that which would generally be judged to be useable but not acceptable for regular use” (= M2)

[B41] Levitt, H., Kozma-Spytek, L., and Harkins, J., “In-the-ear measurements of interference in hearing aids from digital wireless telephones,” Seminars in Hearing, 26(2), pp. 87–98, 2005.

Levitt et al 2005

Exposure: mobile phone in test transmit mode Subjects: Volunteers (n = 42) HLAA (SHHH) members (by mail) ITE and BTE hearing aids Mild to severe hearing loss

Test: subjective Inter-individual variability >25 dB GSM 50% “highly usable”

= 18.2 dB S/N

Hansen Poulsen (1996)Scand Audiol 25:227-232

Exposure: Simulated GSM noise over speech Not correlated with E-field, just SPL

Subjects: volunteers (n = 17)

Subjective Testing GSM noise superimposed on speech background Inter-individual variability >30 dB GSM 50% “not annoying” = 17 dB S/N

Objective Testing Word score reached max at 10dB S/N and did not improve

with increased margin

Nabelek et al (2004-2006)Exposure: Speech babble background noise – not GSM

Subjects: volunteers (n = 191) Clinic

Subjective Testing (MCL – BNL recruited from U Tennessee Audiology = ANL) MCL = most comfortable speech level (quiet background) BNL = background noise level (max tolerated) Inter-individual subjective variability >40 dB “acceptable” ANL (full- vs part-time HA) = 7.5 vs ~14 dB

Smaller ANL predicted HA success (85% of the time)

EHIMA GSM Project (1993-1994)Telecon Denmark

Exposure: GSM Mobile phones placed to users ear

Subjects: volunteers (n = 5)

Hearing aids (n = 5) (i.e., ~ 25 samples)

Subjective TestingNormal hearing individualsGSM 50% “slightly annoying” = 15 dB S/N in

normal environment

Julstrom et al / T-coil

Minimum S/N for a "Usable" Rating

-10

0

10

20

30

40

50

60

0% 20% 40% 60% 80% 100%

subjects meeting criteria

S/N

- d

B

Display

CDMA

GSM

iDEN

TDMA

UMTS

DSSS

FHSS

U Oklahoma (1996-1999)Exposure: Mobile phones in test mode placed to users ear

Subjects: volunteers (n = 78)TestingObjective (word recognition) Subjective (annoyance)

Interference reported primarily as distance for interference to occurPerception of interference increased with increasing severity of hearing loss

National Acoustics Lab (1995)Exposure: mobile phone placed to users ear hooked to network no make / model / antenna type phone oriented and positioned to maximize coupling

Subjects: volunteers both hearing impaired and normal hearing 5 groups of 4-8 volunteers 2 x ITE and 3 x BTE models

Test: interference detection data presented in terms of field strength, distance, and HA

immunity for “noticeable interference” Acceptable performance requires HA immunity ~ 28 dB

SummaryAverage S/N for acceptable performance from recent GSM “usability” testing = 15-18 dBVariability in subjective response (25-40 dB)Current 20 dB S/N in ANSI C63.19 incorporates >3 dB for testing errorRefinements in testing and predictive modeling may support a relaxation in M / T limits ~ 3 dB corresponds to testing margin, not limits per se significant improvement in HA immunity refinements in testing and predictive modeling increasing inter-lab consistency in testing

Usability Definitions

(M/T1) Highly Usable—I would use this phone for almost any call.

(M/T2) Minor Limitations on Use—I would use this phone for most calls, but it is not ideal.

(M/T3) Major Limitations on Use—I would use this phone for a few calls, ‘‘in a pinch.’’

(M/T4) Not Usable—I would not use this phone for any calls.

Usability DefinitionsAre the questions consistent across user groups nature of conversation ? duration ? demographics (age, occupation, regional location) do we need to define a more specific use case ?

Is this the most appropriate approach ? A) does WD + HA combination allow user to hear well ? B) does WD degrade baseline HA performance ?

HLAA Meeting – Reno Nevada“Mobile Phones, Hearing Aids, and the ANSI C63.19

Standard to Make Them Work Together”

Friday June 13, 2:15-3:15pm

Confirmed: Harry Levitt, Joe Morrissey, Dave Preves

Tentative: Dave Case