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Spotted this mod over at Slashdot. If your cellphone interferes with your hearing aid or vice-versa. You'll want to give this tutorial a read. It shows you how to build a non-interfering bluetooth workaround. The Problem
Many of you who read this will be only too aware of the way a mobile telephone can render a hearing aid useless by way of radio frequency interference (RFI). Of course, the closer the phone gets to the hearing aid, the worse the problem becomes, and by the time it's next to the aid, virtually nothing but the RFI is audible. As a result, hearing aid users are generally excluded from using mobile telephones for voice calls, although SMS has proven popular as a partial alternative.
Naturally, people always try to find ways to get around problems like this. Some are lucky enough to be able to take their hearing aid out and compensate with the phone's volume control. Others have relatively RFI-resistant hearing aids, so that they can use the hands-free induction couplers produced by the more attentive manufacturers. These devices let the user keep the phone a metre or so away from the hearing aid, thus attenuating the RFI.
Unfortunately, my hearing loss is sufficiently severe that neither of these workarounds is an option. For a verbal conversation where I can't lipread the other person, I must have the 80 decibels of frequency-dependent boost that my hearing aids provide. Taking them out is not an option, and using such powerful amplification means that the hearing aid can clearly receive RFI from a mobile phone two metres away. No amount of extension cable will make a wired hands-free usable - the wire always conducts enough RFI to cause trouble, regardless of any filters that might be in place.Read More...
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