Sound Wave Engineering
I homeschool a 10 yr. old who will be a full-time student
at a local
university in the fall. He wants to know how we could build a device
that would interfere with strong base sound waves and neutralize them:
perhaps using a digital sensor to detect sound wave frequency, the
device could then generate another sound wave pattern to interfere
destructively with it, reducing or eliminating the previous sound
I don't have a strong enough physics background to know
how to go about doing this. Any help you could offer would be greatly
appreciated. My son has me temporarily stumped over this one.
I too don't have any expertise in this, but my suspicion is that something
like this already exists. I recall hearing about a device that could
effectively remove noise from journalist interviews by using something
similar to what you describe. I cannot say this ever was actually
constructed, perhaps not. Hopefully someone closer to physics can provide
more detailed information or a place to go to research this.
Thanks for using NEWTON!
What you need is a microphone, an inverting amplifier, and a speaker. It's
best if the amplifier and speaker don't introduce any phase shift, but this
is difficult to arrange.
Click here to return to the Engineering Archives
Update: June 2012