Noise cancelling megaphone

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Project Noise Cancelling Megaphone
Status Initializing
Contact Walter
Last Update 2013-01-05


Ever encountered those useless type to cheap to buy a headset for their mp3-playing mobile? To add insult to injury their taste in music tends to be in the 'atrocious' part of the musical-taste-spectrum, often involving autotuned hip hop. This might be a solution.

Combine a directional microphone with a megaphone and a Raspberry Pi for the signal processing. Have the megaphone broadcast the sound collected through the directional microphone just a few milliseconds out of sync back to the source of your annoyance. Also works great on yapping dogs.


  • Megaphone (about 30 USD on eBay)
  • Directional microphone (also about 30 USD on eBay)
  • Raspberry Pi, model A or B (model A goes supposedly for about 25 USD ex tax & shipping)

Easy part

  • Integrating the hardware, probably involving a custom microphone holder (probably 3D-printer) and some epoxy
  • Weather- and fool-proof RasPi case

Hard part

  • Getting a RasPi Model A, they're not available yet
  • Doing the signal processing software, has anyone ported PureData to ARM yet?

Oh yes, they [have]!