You can use iPhone / iPod touch with your earphones like a Hearing aid.
You can hear larger and clear partner voice.
This application's name is "Kikitori". The meaning of "Kikitori" is
"Good to Hear" in Japanese.

"Kikitori" takes in sound from the iPhone microphone. You can listen
from sound devices connected to the earphone jack.

We made the new sound processing for conversations!
Please Try it!

4 features of "Kikitori Hearing Aid":
(1) clear voice
(2) loud volume
(3) low latency
(4) trial free version

Details:

== For Ease of Communication ==

Enjoy natural conversations anywhere... in quiet meeting rooms, inside
running cars, or even in crowded shopping centers.
"Kikitori" suppresses shocking sounds such as jarring car sounds or
the cling clangy sounds of banging tableware.
From quiet story telling voices to loud shouting, "Kikitori" easily
adjusts the volume to a natural, comfortable level.

== for Ease of Using ==

No extra equipment required.
No expertise required.
Simple setup.
"Kikitori" simply amplifies nearby sound better.

== for Ease of high-performance ==

You can always adjust the "Tone Controls" and the "Advanced Settings"
on the fly to match your immediate requirements.
Some functions are limited in the free version, however, all functions
are available for a 3 minute trial.
You can try them again and again.
So why not try the free version?!

How to use:

Set the iPhone volume to the minimum.
Plug in your earphones and press Start!
Adjust the sound volume for your ear conditions and the environment around you.
Advanced settings are also available.

Others:

Use with earphones, when you remove your hearing aids.
Use magnetic induction loops, when you wear your hearing aids equipped
with telecoils.

Try it!

Let us know your feedback about "Kikitori".

Requirements:
* iPhone (after iPhone 3G S) /iPod touch (after the third generation) / iPad.
* iOS after 4.3
* "Kikitori" works with earphones and microphone.
** In case of iPod touch with no microphone, use earphone mic.
** Use with earphones, after removing your hearing aids.
** Use magnetic induction loops, when wearing hearing aids equipped
with telecoils.

About Bluetooth:
http://be-grace.co.jp/archives/3823