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Mar/110
Two Physics Questions - Help is greatly appreciated
?QUESTION ONE:
Is there any way the two individual frequencies can be combined to give the same beat frequency previously measured?
QUESTION TWO:
There are commercial products available called active noise cancellers, which consist of a set of headphones, microphones, and some electronics. Intended for wearing in noisy environments where the user must still be able to hear (for example, radio communications), the headphones reduce noise far beyond the simple acoustic isolation of the headphones. How does such a product work?
You don't have to answer both, but whatever you can help with is greatly appreciated (I will choose best answer).
Thanks everyone!
Question ONE:
Beat frequency a = frequency 1 minus frequency 2
Beat frequency b = frequency 2 minus frequency 1
Question TWO:
There are microphones inside the closed cups of the earphones. A signal processor does a lot of calculations/operations but basically tries to solve the problem in such a way that the difference from the microphones inside the headphone in respect to the audio signal coming from the audio source to the headphone-electronics is zero. Like that the noise is canceled.
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