AMSA84
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My new hearing aids have a very sensitive mode where I can hear people talking very far away without a dish and without any electronic noise.
I was shocked the first time I used it when a woman behind me called my name. I turned around saying hello but she was very far away talking on her cell phone, not talking to me.
Yes, I am serious. I use the very sensitive mode of my new hearing aids to pickup voices of the people mumbling far away in a conference where they push away the microphone for the PA system. I am probably the only person who can hear them.Are you serious? LOL That's a good one.
They are toys, designed by a 10 years old kid and posted as an Instructable:By the way, are you aware of those circuits, simple ones, with the LM386/LM386N?
Yes, I am serious. I use the very sensitive mode of my new hearing aids to pickup voices of the people mumbling far away in a conference where they push away the microphone for the PA system. I am probably the only person who can hear them.
Careful choice of gain distribution, matching current and voltage noise levels to the source impedance, appropriate filtering, appropriate dynamic rage reduction, the usual high gain layout fun, just the usual small signal audio stuff really.
THAT corp make some nice preamp sand, as well as a rather good dynamic range control chip, but there are plenty of others.
The key is the microphone itself, as I say a cheap omni is very unlikely to do it.
Regards, Dan.
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