Signal To Noise Ratio
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Signal-to-noise ratio (often abbreviated SNR or S/N) is a measure used in science and engineering that compares the level of a desired Signal_(electrical_engineering)|signal to the level of background noise. It is defined as the ratio of signal power to the noise power. A ratio higher than 1:1 indicates more signal than noise. While SNR is commonly quoted for electrical signals, it can be applied to any form of signal (such as isotope levels in an ice core or biochemical signaling between cells). The signal-to-noise ratio, the Bandwidth_(signal_processing)|bandwidth, and the channel capacity of a Channel_(communications)|communication channel are connected by the Shannon–Hartley theorem. Signal-to-noise ratio is sometimes used informally to refer to the ratio of useful information to false or irrelevant data in a conversation or exchange. For example, in internet forum|online discussion forums and other online communities, off-topic posts and spamming|spam are regarded as noise that i...
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