Electronics > Projects, Designs, and Technical Stuff

Hearing Aid Amplifier (II)

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Audioguru:
I watched and tried to translate the video but my hearing aids could not make that woman talk without her severe accent.
The woman said it is normal to lose high frequency hearing then everyone tells her to "get used to it". I never got used to being deaf but now when I put my hearing aids on in the morning it takes a few seconds to get used to hearing normally. When I take them off each night then I am suddenly very deaf.

My hearing aids do not have the problems of having no mode selections, they produce no feedback and they do not produce all the noises of her hair brushing on them. I never knock on my scull like she does and just now I tried it with and without my hearing aids, the knocking sounds the same. Wind noise is barely noticeable. I never "plug them in to power them" since each cheap tiny button battery lasts for 10 days.

The audiologist tried converting the highest octave to a lower octave but it made sounds weird so he boosted the highs to do it instead.
My required boost is about double the amount possible with a simple tone controls circuit. 

chris_leyson:
One DSP chip that sprang to mind was AMI Semiconductors BelaSigna 200 because of its weighted overlap add FFT filter banks and on board dual 16-bit ADC and DAC. AMI had a range of audio processors and hearing aid chips, BelaSigna, Tocatta, Ezairo etc. AMI is now part of OnSemi.

WonderWheeler:
Good comments all!

Clarification: yes it is not a "product". We are pretty much all experimenters and hobby-ists on this web site, EEV Blog. I am just trying to promote discussion a little and get the information out there to other people that might be interested. Maybe it will help others.

Yes, carrying a bunch of stuff in a fanny pack is kinda lame. Who knows what the battery life is, but there is plenty of room for more battery power if needed. To tell you the truth, I wish I could also add a Google Glass type headset also. Something to add visual cues that someone is talking while I am sitting at my desk for instance. Maybe even a simultaneous speech to text option some day. I'm not too proud of a dorkey nerd to look a little like a cyborg.

For people that are interested in the technical parts of the hearing and software process, here is another video I found, mentioned in Peggy's talk:

spec:

--- Quote from: Audioguru on November 25, 2018, 05:06:12 pm ---

--- End quote ---
Quite a difference between the hearing loss of men and women- I wonder why that is? Maybe it's because women's ears are not used much- they do not listen that often ^-^

Carrington:
Maybe, would be great to be able to shift a fecuency (or a range) in real time. For example, almost nobody can hear 20Hz, so now imagine that you move those 20Hz to 40Hz.

Also, if I'm not wrong, some people in addition to normal hearing loss (associated with age) cannot hear certain frequencies, but in a discrete way (for example let say they can hear 4000Hz, but not 3500Hz). So in these cases shifting frequencies may be useful, although I'm sure it's not as easy as shifting and that's it...

I still hear without problems from ~ 33 Hz to ~ 17 KHz (I never reach up to 19KHz, I think), but I have started to hear a constant whistle around 10KHz (tinnitus) for some time now, so something's starting to go wrong.  :scared:

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