I have a patient who wears CIC hearing aids. He works in a loud environment and needs to hear when someone is talking to him. He currently wears earmuffs, but can't wear his hearing aids since they feed back. Is there any type of earmuff with a noise cancellation system that might help this patient? Any other suggestions?
Noise cancellation headsets are not the solution to this problem. More often called ANR (for active noise reduction), these devices can provide benefits in isolated instances with substantial low-frequency noise present, but are only occasionally of value in typical occupational settings and provide no obvious benefits for the hearing aid wearer. For more on the applicability of ANR in occupational noise see http://www.aearo.com/pdf/hearingcons/anr.pdf
Options for such a user are to wear an active sound-transmission earmuff which via use of a mic and internal speaker acts like a generic hearing aid at low sound levels, but gradually shuts down as the ambient noise increases, limiting transmitted sounds to the equivalent of 82-85 dBA. Another option is to turn the gain down on the aids and wear them under earmuffs with as large a cup size as possible to reduce the feedback problems. For the CIC user the E-A-R Ultra9000 earmuff also my be of value due to its external orifice that communicates directly to the concha via an acoustical duct. http://www.e-a-r.com/e-a-r.com/muff_detail.cfm?prod_family=Muff 9000&ind_prod_num=330-3028001 Additionally in select situations one may also consider wearing the aids as hearing protectors (see EARLog 18 at http://www.e-a-r.com/hearingconservation/earlog_main.cfm).
Conducting sound field tests with simulations of the actual ambient noise levels in which the patient typically works is also helpful to validate whatever approach is decided upon.
Elliott H. Berger Senior Scientist, Auditory Research E-A-R / Aearo Company 7911 Zionsville Road Indianapolis, IN 46268-1657 317-692-3031 w 317-692-3116 f
Elliott H. Berger, MS, INCE Bd. Cert.
After receiving his M.S. in Acoustical Engineering from North Carolina State University, Elliott joined the Aearo Company in 1976. As E•A•R/Aearo's Senior Scientist, Auditory Research, he conducts hearing protector research and development. He has written over 60 articles on hearing protection/conservation, and was the principal editor for the 4th and 5th editions of the AIHA Noise & Hearing Conservation Manual. Elliott chairs ANSI working group S12/WG11 on real-world hearing protector performance, and is also involved with numerous other standards committees. In 1993 he was the recipient of the National Hearing Conservation Association's Outstanding Hearing Conservationist Award, and in both 1993 and 1998 received their Outstanding Lecture Award. Elliott is Past President of the National Hearing Conservation Association (NHCA), Past-Chair of the American Industrial Hygiene Association's (AIHA) Committee on Noise and a Fellow of the Association, a Board Member of the of the Council for Accreditation in Occupational Hearing Conservation (CAOHC), a Fellow of the Acoustical Society of America (ASA), and a member of the American Speech-Language-Hearing Association (ASHA).
2013 UPDATE: It's years later since this course was created, and yes, probe-mic measures are STILL the best way to verify hearing aid performance! Please note that this course has been reviewed by our editorial staff and is still current.
Mary Ellen Nevins, EdDAshley Garber, MS, CCC-SLP, LSLS Cert AVT
CEUs/Hours Offered: AAA/0.1 Intermediate; ACAud/0.1; AG Bell - LSLS/1.0; BAA/1.0; CAA/1.0; IHS/1.0; Kansas DHE, LTS-S0035/1.0; NZAS/1.0
This presentation contrasts two models for individual habilitation: pull out therapy versus in-class support. Considerations for goal setting and case management relative to the role of audition are addressed; specific case studies will be presented. **FOR A GENERAL CERTIFICATE OF PARTICIPATION (No CEUs) PLEASE DOWNLOAD THE "COCHLEAR CERTIFICATE HANDOUT" AFTER REGISTRATION**
Verification of advanced algorithms such as Directionality, Noise Reduction, Digital Feedback Suppression will be presented. Methods used will include Probe Mic measurements, 2 CC couple measurements, as well as behavioral and self assessment measurements. [This is a recording of a live event that took place on 8/8/06]
Using traditional approaches for real-ear verification with advanced technology can provide incomplete and/or inaccurate data. Issues concerning real-ear measures and advanced hearing aid technology are reviewed and include the interaction between test signal and signal processing, verification of advanced features, speech mapping, and impact of open fittings.