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Home > Archive > Hearing loss support > February 2006 > DAI Phone Headsets
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DAI Phone Headsets
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| Has anyone ever seen a phone headset that would connect to the hearing
aid via the DAI boot vs. using the telecoil? I have seen the BlueTooth
ELI devices, but looking for a more traditional headset that uses the
DAI for connecting to hearing aids.
Thanks.
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| Direct connection from something galvanically connected to a telephone
line to a hearing aid may not be the safest thing to do.
Connection to DAI from a headset jack on a cordless telephone or on a
cell phone would probably be OK. There may already be a DAI cable for
this or you should be able to make one up.
See:
http://www.connevans.com/products/sect_02_2006.pdf
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| The simplest way to connect a telephone receiver to a telecoil is to
hold the receiver against the telecoil. Not all receivers generate a
magnetic field so it does not always work.
It is possible to buy phones which have a headphone socket - the
Ameriphone Dialogue series is an example. You listen with headphones
and talk into the handset mike.
Telecoils LOVE headphones. Virtually all headphones - I am talking
about big, sensitive ones, preferably with big comfortable cushons
around earh earpiece - the kind pilots and hi-fii devotees use -
generate a big magnetic field which the telecoils readily pick up. And
because the signal is passed direct to the telecoil, with the mike
disengaged, all background noise is eliminated.
I am in the process of going cochlear which indicates the status of my
hearing. Yet I can, at a pich, listen to phone and TV through the
headphone/t-coil link.
I have also used DAI for TV. I find headphones simpler. Attaching the
DAI shoes to each HA is a pain in the neck. If you leave the shoes on
the aids they are unsightly and, according to one post to this group
about ten yars ago, the operation of som eaid programmes is affected.
I have never used DAI for phone. Phone electronics are a world unto
themselves - every phone in the world today (and there must be billions
of them) uses the original system which involved things called
induction coils and those hand-wound ringers (which most members of
this group would never have heard of, let alone seen). Solid state
electronics are now used but they have to simulate the old technology
(like Windows XP has to accommodate the personal finance programme I
wrote in the early days of DOS. When you attempt to amplify phone
audio all sorts of odd things happen. Landline phones are living
fossils.
Cell phones are something else - the latest Nokia neck loop (which
draws its power from the phone and requires no batteries) links Nokia
phones to the telecoil directly and this system works well. I have
never heard of a cell phone accessing DAI. But it would probably be
much easier to design such a system than for normal phones.
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