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Trevor - The loudspeakers pumping out the cancelling noise is increasing the amount of sound energy in the neighbourhood. There will be places, maybe your neighbour’s house, where the noise will actually be worse. Finally, even if you could get it to work, it will always be much cheaper to build and maintain a noise barrier, but all is not lost.
Just in the way those noise cancelling headphones work. On airplanes, they cancel off the external sounds. You hear the internal sound coming from your speakers, but the brain would have to make a prediction, rather complex prediction of what was going to happen.
So, I'd start with a quote from one of the characters, just a scrap of dialogue mentioning the noise cancelling headphones and then I lead in from that to, how do noise cancelling headphones work, what is actually going on, the different types of noise cancelling headphones and the way they are engineered.
Why do all speakers make the same odd noise when they are near a ringing phone & intercept the signal? Answer Dave - The phone is sending out a signal to all the nearby base stations, essentially telling them where it is, and I think possibly also to allow the base station to characterise what direction it should send the the signal in, and all ...
We've come down the decks to the engine level, starting off the tour in the diesel generator room. There's not much to say, which is probably a good thing given the noise, but this is the past. Let's go see the future. Dmitri - My name is Dmitri. I am chief engineer on the P&O Pioneer. We are in a battery room now that's one of 4 battery rooms.
You've probably seen a sine wave: it's basically just a very specific "zigzaggy / wiggly" line. Now, if the speaker moves in any other pattern than that - you could imagine it's moving slowly with a big wiggle and then on top of that superimposed, there's a little wiggle - then it would be outputting sound with the low frequency, the big slow wiggle, and also a much higher frequency (the small ...
Dave - Okay, I've built some experiments on this recently and basically, this is due to what you think the three primary colours are, aren't necessarily actually the three primary colours.
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James - So let's have another go. We're going to repeat the experiment, but with silences instead of beeps cutting through ambient noise in a bustling restaurant. It's the same format as last time, two short silences followed by a longer silence. Which seems longer overall? <Two periods of silence>
And the question as to whether this fear is innate or learned is very difficult to answer. Naturally, awareness of predatory noise spreads quickly through a community, but there are also studies that say certain prey species fear the sound of predators that have been extinct in that area for sometimes many, many generations.