# FM stereo hearing aid question.

S

#### [email protected]

Jan 1, 1970
0
A pair of FM 'bug' transmitters could send left/right signals to a pair
of separate FM ear phones that would be helpful to the hard of hearing.

AFAIK an MP3 FM transmitter takes the MP3 audio out of the headphone
jack and modulates it in FM stereo for transmission to an FM receiver.

Assume a pair of FM stereo headphones, how could one integrate the
signals from left/right FM 'bugs' for transmission to the FM

Perhaps a multiplex arrangement of separate FM transmitter/receivers,
one for each ear, and tuned to 2 different frequencies would be
possible and desireable.

As 'Bluetooth' style ear receivers become more common, hearing aids in
the same shape will be easily hidden in plain sight.

Using DSP for noise cansellation, directivity, etc, combined with an FM
system, fabulous 'bionic' hearing would be possible.

All help would be greatly appreciated.

K

#### Ken Taylor

Jan 1, 1970
0
A pair of FM 'bug' transmitters could send left/right signals to a pair
of separate FM ear phones that would be helpful to the hard of hearing.

AFAIK an MP3 FM transmitter takes the MP3 audio out of the headphone
jack and modulates it in FM stereo for transmission to an FM receiver.

Assume a pair of FM stereo headphones, how could one integrate the
signals from left/right FM 'bugs' for transmission to the FM

Perhaps a multiplex arrangement of separate FM transmitter/receivers,
one for each ear, and tuned to 2 different frequencies would be
possible and desireable.

As 'Bluetooth' style ear receivers become more common, hearing aids in
the same shape will be easily hidden in plain sight.

Using DSP for noise cansellation, directivity, etc, combined with an FM
system, fabulous 'bionic' hearing would be possible.

All help would be greatly appreciated.
Why on earth use FM in this process? Hearing aids are essentially
amplifiers, albeit very selectively frequency dependant. Noise suppression
and so forth using DSP is already built in to modern units. A 'bionic'
hearing aid, for the profoundly deaf, actually 'decodes' the audio and
stimulates nerve endings in the ear itself rather than sending sound into
the ear.

If you are just after a transmitter to get audio from an electronic device
(TV, stereo, whatever) to a person some distance away, this is already done
in stereo (my mother-in-law has one) using a stereo FM transmitter and

If you have a stereo FM headphone you need a (single) stereo headphone
transmitter - you can't 'multiplex' two mono FM transmitters and receive

Cheers.

Ken

D

#### [email protected]

Jan 1, 1970
0
I've had a similar idea as a method for overcoming the mono sound for
the FM systems used in hearing aids. I use the TelCom from Phonak
which takes the stereo connectors from my home receiver, but then
broadcasts the audio over FM in mono since both ears pickup the same
signal. There isn't a right and left on the FM receivers for my
hearing aids. I'm pretty sure there is a way to set the receivers on
the hearing aids to receive a different frequency. Now I would just
need the TelCom or some other FM transmitter to broadcast Left to one
frequency, and Right to another. Having FM is great, but not having
Stereo for music and movies is a bummer. (And yes, I realize that I'm
probably trying to make these things do more than they were originally
intended, and that I could just go and use my regular headphones if I
really wanted.)

I haven't spent enough time on the matter, but do know that you can buy
small transmitters for pretty cheap and tune them yourselves.

Dane Ashworth

J

#### Jim Thompson

Jan 1, 1970
0
I've had a similar idea as a method for overcoming the mono sound for
the FM systems used in hearing aids. I use the TelCom from Phonak
which takes the stereo connectors from my home receiver, but then
broadcasts the audio over FM in mono since both ears pickup the same
signal. There isn't a right and left on the FM receivers for my
hearing aids. I'm pretty sure there is a way to set the receivers on
the hearing aids to receive a different frequency. Now I would just
need the TelCom or some other FM transmitter to broadcast Left to one
frequency, and Right to another. Having FM is great, but not having
Stereo for music and movies is a bummer. (And yes, I realize that I'm
probably trying to make these things do more than they were originally
intended, and that I could just go and use my regular headphones if I
really wanted.)

I haven't spent enough time on the matter, but do know that you can buy
small transmitters for pretty cheap and tune them yourselves.

Dane Ashworth

I have a Sony headset that is "wireless" stereo. It uses IR to
transmit from source to phones.

...Jim Thompson

S

#### [email protected]

Jan 1, 1970
0
Here's one cheap way for FM stereo.

2 Lobeman FM earclip receivers. $14.95 ea 2 FM bugs sold on Ebay for about$20 ea.

Tune Left for one freq and the Right for another freq.

Certainly under \$100

M

#### Michael Black

Jan 1, 1970
0
Jim said:
I have a Sony headset that is "wireless" stereo. It uses IR to
transmit from source to phones.
and I think it's their system (at least what they make nowadays)
that is often sold as an aid to the deaf.

But they use a separate receiver, and then feed the signal into
the hearing aids via inductive coupling. Most hearing aids have
an inductive pickup as standard, for use with telephones, so basically
placing a flat coil betweeen the aid and the head couples signal into
it.

The IR receiver has just a standard headphone jack on it, so it can
be used with headphones or the coupler.

Use a stereo IR system with two couplers, and you get stereo.

I wonder what is in the original poster's hearing aid. I find it
the "wireless transmitter" is an audio amplifier feeding a loop,
which allows inductive pickup in the hearing aid. That will never
be stereo, since there's no way of differentiating between the
audio loop on the left channel and the audio loop on the right channel.

Michael

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