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# Noise
Noise in general is an undesirable [signal](signal.md) that's mixed in with useful signal and which we usually try to filter out, even though it can also be useful, especially e.g. in [procedural generation](procgen.md). Typical example of noise is flickering or static in video and audio signals, but it can also take a form of e.g. random errors in transferred texts, irrelevant links in web search results or imperfections in measuring of economic data. In measurements we often talk about [signal to noise ratio](snr.md) (SNR) -- the ratio that tells us how much noise there is in our data. While in engineering and scientific measurements noise is almost always something that's burdening us (e.g. [cosmic microwave background](cmb.md), the noise left over from the [Big Bang](big_bang.md), may interfere with our radio communication), in some fields such as [computer graphics](graphics.md) (and other computer [art](art.md)) or [cryptography](cryptography.md) we sometimes try to purposefully generate artificial noise -- e.g. in [procedural generation](procgen.md) noise is used to generate naturally looking terrain, clouds, textures etc.
Noise in general is an undesirable [signal](signal.md) that's mixed in with useful signal and which we usually try to filter out, even though it can also be useful and appreciated, especially e.g. in [procedural generation](procgen.md) or as a pleasant ingredient in [art](art.md) (e.g. analog film noise, crackling in vinyl audio etc.). Typical example of noise is flickering or static in video and audio signals, but it can also take a form of e.g. random errors in transferred texts, irrelevant links in web search results or imperfections in measuring of economic data. In measurements we often talk about [signal to noise ratio](snr.md) (SNR) -- the ratio that tells us how much noise there is in our data. While in engineering and scientific measurements noise is almost always something that's burdening us (e.g. [cosmic microwave background](cmb.md), the noise left over from the [Big Bang](big_bang.md), may interfere with our radio communication), in some fields such as [computer graphics](graphics.md) (and other computer [art](art.md)) or [cryptography](cryptography.md) we sometimes try to purposefully generate artificial noise -- e.g. in [procedural generation](procgen.md) noise is used to generate naturally looking terrain, clouds, textures etc.
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