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Using your Apple laptop as a hearing aid/sound enhancer Laptop Macs
How to turn your Apple laptop with built-in microphone and GarageBand into a functioning hearing aid:
  1. Open Garageband and create a new song.
  2. Delete the piano track that comes up automatically.
  3. Plug in a pair of headphones.
  4. Create a new track. Make it a vocal track. Make sure you choose "monitor on."
Your laptop's built-in microphone will now act as a hearing aid/sound enhancer. All sounds in the room will be amplified for your listening pleasure. I used this trick over the weekend when my clogged sinuses caused dramatic hearing loss at an important out-of-town event. It worked very well. If your headphones leak enough sound, you may hear feedback. Just adjust the input or output volume in GarageBand until the feedback goes away.
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Using your Apple laptop as a hearing aid/sound enhancer
Authored by: tc60045 on Dec 13, '07 08:34:56AM

Now, extending this, can you figure out a way for GarageBand to produce "anti-sound" in response to the ambient noise, so that all you hear is silence? That would be a very, very good trick.

Until then, I'll keep my bulky Bose QCs on....



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Using your Apple laptop as a hearing aid/sound enhancer
Authored by: xianman on Dec 13, '07 02:54:50PM

I believe for this to work you would need a mic right next to each ear, then have your Mac invert the phase of the sound coming into each mic within as few samples as possible, then output the sound back to your headphones. In other words, I think your best bet would be to buy some noise canceling headphones =).



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Using your Apple laptop as a hearing aid/sound enhancer
Authored by: xianman on Dec 13, '07 02:57:24PM

Oops, I guess I mean you'll need to keep your bulky Bose QCs on.



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Using your Apple laptop as a hearing aid/sound enhancer
Authored by: Unsoluble on Dec 13, '07 12:30:19PM
If GarageBand could invert the phase of incoming live audio, that'd do the trick, but it can't. ("anti-sound" is made by playing a sound that is identical to the source, but 180 degrees out of phase, creating destructive interference. Here's some more info, if anyone's interested)

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Using your Apple laptop as a hearing aid/sound enhancer
Authored by: Aegir on Dec 14, '07 03:48:29AM

Thanks! Great hint! Being slightly hearing impaired AND very sloppy with my hearing aid, I often forget to take it with me. I never forget my PowerBook or headphones...

Another use for the same hint: connect your wireless headphones (range a 100 yards or so) during a meeting with your bosses and leave your Mac on while visiting the bath room :)



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Using your Apple laptop as a hearing aid/sound enhancer
Authored by: azureblue on Dec 14, '07 06:06:42AM
A lighter weight solution would be Rogue Amoeba's free LineIn:

http://www.rogueamoeba.com/freebies/


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Using your Apple laptop as a hearing aid/sound enhancer
Authored by: sezme on Dec 14, '07 06:57:59AM

Nice hint ... now if someone could make an iPod nano work this way, I'd be very happy.



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