It doesn’t mute the entire sound wave.The sound you hear is a combination of many sources. It’s still only amplitude (strength) and frequency (characteristics), but the combination is a “messy” sound wave instead of the stereotypical smooth sine wave you see in intro physics. That’s how speakers, even though they’re typically have just Shark Summer Vacation Hawaiian Shirt Short sound-producing surface, can generate all sorts of sounds, including combined sound (like someone talking over washing dishes).The technique applies the reverse waveform of the song onto the soundtrack of the video at exactly the right time point. This reverse waveform will add to the soundtrack but because it is exactly the reverse of the song in question, it will cancel out the song, but leave the other parts of the soundtrack intact. The trick is to get the timing, amplitude and song version correct.Coincidentally, this is also how one can still hear music over noise canceling headphones. The headphones has a mic to detect ambient sound, so it know what reverse waveform to apply to the signal that’s producing the music, thus canceling only the ambient noise but leaving the music intact.
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to be precise it does actually remove some of the other sounds, but only if they are exactly the Shark Summer Vacation Hawaiian Shirt Short pitch and tone as the music, in which case your brain wouldn’t have differentiated them from the song on the first watch with the music anyway.Sound is a wave pattern. If you add the exact opposite of that wave pattern, it cancels out that wave pattern.If you have a bunch of different noises, like a song, a person talking, and a dog barking, you have a combination of a bunch of wave patterns.If you add the exact opposite wave pattern of just one noises (the song, in this instance), it only cancels out the wave pattern it’s opposite to. But since it isn’t the opposite of any of the other sounds’ wave patterns, it doesn’t cancel them out. So you still hear the dog barking and the person speaking, just not the song.
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