Electronics > Beginners

Active Noise Cancellation

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David Cutcher CEG:
I'm looking for an Active Noise Cancellation Circuit for headphones that I can build with standard hard wire stock. To cancel out loud voices around me. 
I see that Digikey lists a dedicated IC made by AMS (AS3410-EQFP) but not stocked. That's a red flag for me.
Suggestions?
David Cutcher "Certified Evil Genius"

Audioguru:
You forgot to say what the noises are and what produces them.
Hum or hiss from a loudspeaker or headphones?
Traffic noises?
Many little kids at a playground?

Noise cancelling headphones use a microphone to pickup noises outside the headphones then use an electronic circuit to add the noise out-of-phase to cancel the noise heard inside the headphones. Is that what you want? 

David Cutcher CEG:
I do understand the concept. And have tried to build it using an inverting amplifier. But realize I don't know enough to get it precisely out of phase.
My apologies for not including specs.
I'm looking to build an active noise cancelling circuit that blocks in normal speech range. My step daughter is developmentally delayed, and speaks her immediate thoughts aloud, continuously. Not making light of the situation, but I can turn up the volume of my own music just so far.
This would be different than ones blocking jet engine noise or working in a shop situation. Those actually allow some normal speech range through.
David Cutcher "Certified Evil Genius"

Marco:
Not sure if a headset is the best solution, earplugs work better than noise cancellation and earplug+audio combinations are affordable.

Less isolating visually.

David Cutcher CEG:
Yes, earplugs are affordable. Not as much fun.
But I want to build and learn an area I'm not familiar with.
DC

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