How about I change direction. Instead of making hearing aid why don't I make something that will help the hearing impaired.
My bigest problem and most people that where hearing aids is phone conversations. I miss some of words but not all while listening on phone. I was thinking of making a ascii readout on a LCD 1 x 8. But not sure what I would need. I have to convert the analog voice pattern store ram read it to LCD, maybe I could use 89c2051 or 89c4051 for microcontroller. Another words have my voice conversation scrolling on LCD as someone talks to me on the phone. So that way I would not misout on parts of the telephone conversation. Their no hearing aid I know of that works correctly on a telephone conversation. Including the one with telephone switch on BTE. Most hard of hearing people only need to see what being said on their telephone conversation.
I also have to interface to phone network, in some way.
Any suggestions if works out I will try some prototypes.
I will also have to use an 8051 core as that's only one I have worked with to some degree. Also the unit should be battery operated for portability. The display could be 1x16 or 2x16 for small size. Should fit in palm of your hand. The first prototype could be larger. Any way any one have suggestions of what telephone interface I sure have to pick voice conversations.


Best reguards,


Ralph


P.S. I moved this post because it is using 8051 core part. And should be on the message board.