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SNR
The initialism SNR may refer to: * 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 deci ... ** Signal-to-noise ratio (imaging) * Supernova remnant * Society for Nautical Research * Senior, a male generational title suffix * Sanderstead railway station, London, National Rail station code * Stabbursnes Nature Reserve, a protected area located in Porsanger {{disambig ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Signal-to-noise Ratio (imaging)
Signal-to-noise ratio (SNR) is used in imaging to characterize image quality. The sensitivity of a (digital or film) imaging system is typically described in the terms of the signal level that yields a threshold level of SNR. Industry standards define sensitivity in terms of the ISO film speed equivalent, using SNR thresholds (at average scene luminance) of 40:1 for "excellent" image quality and 10:1 for "acceptable" image quality. SNR is sometimes quantified in decibels (dB) of signal power relative to noise power, though in the imaging field the concept of "power" is sometimes taken to be the power of a voltage signal proportional to optical power; so a 20 dB SNR may mean either 10:1 or 100:1 optical power, depending on which definition is in use. Definition of SNR Traditionally, SNR is defined to be the ratio of the average signal value \mu_\mathrm to the standard deviation of the signal \sigma_\mathrm: : \mathrm = \frac when the signal is an optical intensity, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Supernova Remnant
A supernova remnant (SNR) is the structure resulting from the explosion of a star in a supernova. The supernova remnant is bounded by an expanding shock wave, and consists of ejected material expanding from the explosion, and the interstellar material it sweeps up and shocks along the way. There are two common routes to a supernova: either a massive star may run out of fuel, ceasing to generate fusion energy in its core, and collapsing inward under the force of its own gravity to form a neutron star or a black hole; or a white dwarf star may accrete material from a companion star until it reaches a critical mass and undergoes a thermonuclear explosion. In either case, the resulting supernova explosion expels much or all of the stellar material with velocities as much as 10% the speed of light (or approximately 30,000 km/s) and a strong shock wave forms ahead of the ejecta. That heats the upstream plasma up to temperatures well above millions of K. The shock continuou ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Society For Nautical Research
The Society for Nautical Research is a British society that conducts research and sponsors projects related to maritime history worldwide. Founded in 1910, the Society initially encouraged research into seafaring, ship-building, the language and customs of the sea, and other items of nautical interest. The Chairman of the Society is David Davies. Past chairmen include Alan Villiers, Michael Lloyd, Richard Harding and the immediate past chairman, Admiral Sir Kenneth Eaton. Past projects HMS ''Victory'' preservation In 1922 the Society initiated a public appeal in the United Kingdom to raise funds to save Vice-Admiral Horatio Nelson's flagship HMS ''Victory''. Launched in 1765, the ship was in very poor condition by 1922. Sir James Caird, and the Save The Victory Fund raised sufficient funds to secure HMS ''Victory'' in dry dock in Portsmouth and provide a permanent endowment for the ship. The Society established The Victory Technical Committee to research preservatio ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sanderstead Railway Station
Sanderstead railway station is on the Oxted Line in the London Borough of Croydon, from Sanderstead village. It is in Travelcard Zone 6, from . The station is managed by Southern (Govia Thameslink Railway), Southern. On the up (London-bound) platform is a ticket office, staffed for most of the day, and a self-service ticket machine is outside the station on the up side: there is no Permit to travel, PERTIS (Permit to travel) machine. Purley Oaks railway station, Purley Oaks, also in Travelcard Zone 6, is nearby. History The station was opened on 10 March 1884 by the London, Brighton and South Coast Railway and the South Eastern Railway (England), South Eastern Railway with their line between Oxted Line, South Croydon and East Grinstead. The population was around 300, rising to 534 by 1901. In 1913 the station was set alight in an act of arson. The suffragette Elsie Duval was the main suspect. The replacement building was Weatherboarding, weather-boarded, cheap to construc ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Initialism
An acronym is a type of abbreviation consisting of a phrase whose only pronounced elements are the initial letters or initial sounds of words inside that phrase. Acronyms are often spelled with the initial letter of each word in all caps with no punctuation. For some, an initialism or alphabetism connotes this general meaning, and an ''acronym'' is a subset with a narrower definition; an acronym is pronounced as a word rather than as a sequence of letters. In this sense, ''NASA'' () is an acronym, but '' USA'' () is not. The broader sense of ''acronym'', ignoring pronunciation, is its original meaning and in common use. . Dictionary and style-guide editors dispute whether the term ''acronym'' can be legitimately applied to abbreviations which are not pronounced as words, and they do not agree on acronym spacing, casing, and punctuation. The phrase that the acronym stands for is called its . The of an acronym includes both its expansion and the meaning of its expans ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Suffix (name)
A name suffix in the Western English-language naming tradition, follows a person's surname (last name) and provides additional information about the person. Post-nominal letters indicate that the individual holds a position, educational degree, accreditation, office, or honor (e.g. "PhD", "CCNA", "OBE"). Other examples include generational designations like "Sr." and "Jr." and "I", "II", "III", etc. Post-nominal letters Academic Academic suffixes indicate the degree earned at a college or university. These include bachelor's degrees (AB, BA, BS, BE, BFA, BTech, LLB, BSc, etc.), master's degrees (Master of Arts, MA, MS, MFA, LLM, Landscape architecture, MLA, MBA, MSc, MEng etc.), professional doctorates (Juris Doctor, JD, Doctor of Medicine, MD, Doctor of Osteopathic Medicine, DO, PharmD, DMin, etc.), and academic doctorates (PhD, EdD, DPhil, DBA, LLD, EngD, etc.) In the case of doctorates, normally either the prefix (e.g. "Dr" or "Atty") or the suffix (see examples above) ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
