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Published byGrant Griffin Modified over 8 years ago
1 Why do we need Assistive Listening? User Interface Options Transmission Options Examples of ALDs and ALSs Finding and Using ALDs and ALSs Latest Stuff Recommendations ALD Introduction
2 Hearing Aids and CIs Best in Quiet and Close Not so good at a distance Not so good in noise Not so good when sounds bounce around ALDs can solve those “Big Three” problems Bring the sound you want to hear right to your ears Eliminate or at least reduce the noise Eliminate the reverberation (bounced sound) Minimize the loss of signal from conversion Make a HUGE difference in how much you understand Why We Need ALDs
3 Distance Double the distance; QUADRUPLE the loss Varies with frequency (highs don’t “travel” well) Noise What you want to hear is easy to lose in the din The “signal to noise” ratio matters Reverberation Even without noise, sound you want to hear gets “spread out” as it bounces around the room Hear the “straight line” first, but then delayed versions of the same thing at lower volume. The Big Three
4 Reverberation Reverberation and echos reduce speech intelligibility
5 The TV from Across the Room On the Phone In the car Your Friends at Dinner At the Museum At the Movies At a Play In a Noisy Restaurant Other Audio Sources Radios Music Players iPods Hearing Your Best
6 Hearing aids and CIs have microphones for Input microphones hear everything Background noise Reverberation Poor quality signal after distance. Some hearing aids and CIs have other input options Hearing Aids and CIs
7 The following input paths can be used instead of or in addition to the hearing aid or CI’s microphones. Magnetic Analog Telecoil Digital Near Field Magnet Input (NFMI) Direct Audio Input (DAI) FM Receivers Boot Embedded By having access to these alternatives, you can choose how to hear best in every situation. Get your audiologist to set up your programs and explain how to use them Other Input Paths
8 Headphones (no Hearing Aids or Cis or telecoils) Headphones (with telecoils in Hearing Aids or Cis) Earbuds (usually only works without hearing aids) Neckloops Standard Analog (to telecoils) Near Field Magnetic Interface (NFMI) … digital induction Silhouettes (to telecoils) FM Boots (to DAI) Embedded Patch cord (to DAI) Interface Options
9 Pocketalker (or similar) Wired Connect Via Neckloop Silhouettes DAI Headphones ~$140 Personal Amplifiers
10 Personal FM Solutions Transmit sound from transmitter to receiver by FM radio. Directional Microphones You choice of Interface
11 Personal IR Solutions Transmit sound from transmitter to receiver by Infrared light. Directional Microphones Some let you choose interface Mostly for TV (not very portable)
12 Personal Loops Room loops – TV – Computer Chairpad loops Tableloops
13 Bluetooth Bluetooth uses a digital signal to communicate between a pendant and paired audio sources It can be “two-way” so it can work with phones both in and out Transmission/receiving done in pairs; not a “broadcast” Digitally encoded, so it’s private Your Bluetooth device can “remember” several different pairings and reconnect automatically Only connects with one paired device at a time
14 So far, there are no Bluetooth Hearing Aid or CIs Bluetooth loopsets can connect you to phones (and TVs, iPods, Tablets, Computers and remote mics) – Standard Bluetooth – NFMI Oticon Phonak Bluetooth Bluetooth to Device Standard Analog Magnetic to Hearing Aids/Cis Advantages Cheap Not Proprietary Disadvantages Bilateral but Mono Possible EMI (interference) Bluetooth to Device NFMI Magnetic to Hearing Aids/CIs Advantages Some are True Stereo No Interference Disadvantages More Expensive Proprietary
Bluetooth Good – Relatively cheap – Some are Integrated with remote controls – Some are true stereo – No Electromagnetic Interferences (unlike regular telecoils) Possible issues – Short range (maybe 30 ft) – NFMI is Proprietary; must match your hearing aids – Uses a lot of power (so far) it must be a pendant – Processing delay can be more than 25 ms Ok for phone calls or listening to music or radio May be distracting if watching TV or other video
18 Systems Assistive Listening Systems – FM – IR – Loops Installation – Permanent – Portable Movies, Auditoriums, Theaters, Stadiums, Churches, Classrooms,
Jacks and Plugs Mono (1 ring, 2 sections) Stereo (2 ring, 3 sections) Cell Phone (3 rings, 4 sections) Stereo to Mono Adaptor Male to Male Adaptor RCA to male 3.5 mm Optical
Simple Mic to TV Place a good mic near the TV Patch it via wire or your favorite wireless to your ALD of choice – FM – IR – Bluetooth Use your favorite interface – Headphones – Earbuds – Neckloop – Silhouette(s) Works, but better to patch directly to the TV
Patching to a TV Then with appropriate adaptor to your favorite interface o Bluetooth TV adaptor o FM o InfraRed o Stereo System o Room Loop o Headset May need a stereo/mono adaptor May need different style jack Some newer TVs don’t have “line outs”, but use an Optical audio output. You would need a d/a converter to patch to most ALDs.
22 Finding Systems Signs – IR – Loops – ALDs Websites – www.aldlocator.com www.aldlocator.com – www.loopamerica.org www.loopamerica.org – http://www.americanhearingloop.com/hearing-loop- locations.html http://www.americanhearingloop.com/hearing-loop- locations.html – www.captionfish.com www.captionfish.com – http://www.hearinglossweb.com/tech/ald/loop/loop.htm http://www.hearinglossweb.com/tech/ald/loop/loop.htm
23 Resources www.ncatp.org Information Trial equipment www.ncdhhs.gov/dsdhh/ www.ncdhhs.gov/dsdhh/ Regional Centers Equipment Distribution www.nchearingloss.org Glossary defines terms HLAA Conventions Don’t miss the exhibit area
24 Recommendations Look for where you could benefit from Assistive Technology. Consider which technologies meet your needs. Try out the technology in various situations. Never buy a hearing aid that doesn’t have standard telecoils Get your telecoils activated and tuned to your needs. Learn how to change to the best program for each situation. Consider other options such as a personal amplifier, Bluetooth, FM or IR Standard telecoils are NOT obsolete Some aids have both NFMI and standard telecoils.
25 Latest Stuff Roger FM (by Phonak but supports most brands) Pen mic Clipon mic Boot or embedded receivers Cochlear Dynamic FM For BAHA For Nucleus CI (soon) MFi (Made for iPhone) hearing aids Some direct to aids from several manufacturers Some to a “gateway” device
26 Questions? Now I’ll stay as long as you like Later Email me at firstname.lastname@example.org
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