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Wikipedia Entry: Signal-to-noise ratio

Signal-to-noise ratio (SNR or S/N) is a measure used in science and engineering that compares the level of a desired signal to the level of background noise. SNR is defined as the ratio of signal power to noise power, often expressed in decibels. A ratio higher than 1:1 (greater than 0 dB) indicates more signal than noise.

SNR is an important parameter that affects the performance and quality of systems that process or transmit signals, such as communication systems, audio systems, radar systems, imaging systems, and data acquisition systems. A high SNR means that the signal is clear and easy to detect or interpret, while a low SNR means that the signal is corrupted or obscured by noise and may be difficult to distinguish or recover. SNR can be improved by various methods, such as increasing the signal strength, reducing the noise level, filtering out unwanted noise, or using error correction techniques.

SNR also determines the maximum possible amount of data that can be transmitted reliably over a given channel, which depends on its bandwidth and SNR. This relationship is described by the Shannon–Hartley theorem, which is a fundamental law of information theory.

SNR can be calculated using different formulas depending on how the signal and noise are measured and defined. The most common way to express SNR is in decibels, which is a logarithmic scale that makes it easier to compare large or small values. Other definitions of SNR may use different factors or bases for the logarithm, depending on the context and application.

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A tag is a type of metadata keyword or label that makes finding information in this blook on a specific subject easier. All posts in this blook tagged with the word Signal-to-noise ratio are listed below. You will find a list of all tags in the tag cloud and a shorter list of tags with their descriptions in the glossary

Using the Concept of Signal-to-noise Ratio as a Metaphor The ratio of useful or true information to false or irrelevant information

Gurteen Knowledge Blog December 31, 2020, 14:31Daniel Smachtenberger, when discussing the pollution of the information ecosystem with misinformation and disinformation in his talks on the War on Sensemaking, says things like: I’m trying to make sense of things because I have to be able to parse signal from noise. We would hope, though, that there are … Continue reading Using the Concept of Signal-to-noise Ratio as a Metaphor The ratio of useful or true information to false or irrelevant information

We Can Learn From Anyone There is always some signal

Gurteen Knowledge Blog August 3, 2021, 11:07Occasionally a reader of my knowledge letter takes issue with one of my posts or quotations that reference certain other people or their ideas or even their tone. One or two readers have even stopped subscribing to my knowledge letter at the mere mention of someone’s name. Typically, they “do … Continue reading We Can Learn From Anyone There is always some signal

Signal-to-noise Ratio The ratio of useful or true information to false or irrelevant data

The term “signal-to-noise ratio” is a useful metaphor when discussing the pollution of the information ecosystem with misinformation, disinformation, or situations where much of the information available is irrelevant. A signal-to-noise ratio is a measure most frequently used in science and engineering, comparing the level of a signal to the background noise level. But it … Continue reading Signal-to-noise Ratio The ratio of useful or true information to false or irrelevant data