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One-third Octave
A one-third octave is a logarithmic unit of frequency ratio equal to either one third of an octave (1200/3 = 400 cents: major third) or one tenth of a decade (3986.31/10 = 398.631 cents: M3 ). An alternative (unambiguous) term for one tenth of a decade is a decidecade. Definitions Base 2 ISO 18405:2017 defines a "one-third octave" (or "one-third octave (base 2)") as one third of an octave, corresponding to a frequency ratio of 2^. A one-third octave (base 2) is precisely 400 cents. Base 10 IEC 61260-1:2014 and ANSI S1.6-2016 define a "one-third octave" as one tenth of a decade, corresponding to a frequency ratio of 10^. This unit is referred to by ISO 18405 as a "decidecade" or "one-third octave (base 10)".(This makes sense as, if we want one third of an octave, the ratio will be f2/f1=2^, and if we log10 both members of equation we have, log=log-> log(f2/f1)=log(2)*1/3, which is approximately 0,1. One decidecade is equal to 100 savarts (approximately 398.631 cents). See a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Augmented Chord In The Chromatic Circle
Augment or augmentation may refer to: Language *Augment (Indo-European), a syllable added to the beginning of the word in certain Indo-European languages * Augment (Bantu languages), a morpheme that is prefixed to the noun class prefix of nouns in certain Bantu languages *Augment, a name sometimes given to the verbal ''ō-'' prefix in Nahuatl grammar Technology * Augmentation (obstetrics), the process by which the first and/or second stages of an already established labour is accelerated or potentiated by deliberate and artificial means * Augmentation (pharmacology), the combination of two or more drugs to achieve better treatment results *Augmented reality, a live view of a physical, real-world environment whose elements are ''augmented'' by computer-generated sensory input * Augmented cognition, a research field that aims at creating revolutionary human-computer interactions * Augment (Tymshare), a hypertext system derived from Douglas Engelbart's oN-Line System, renamed "Augm ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Savart
The savart is a unit of measurement for musical pitch intervals (). One savart is equal to one thousandth of a decade ( 10/1: 3,986.313714 cents): 3.9863 cents. Musically, in just intonation, the interval of a decade is precisely a just major twenty-fourth, or, in other words, three octaves and a just major third. Today, musical use of the savart has largely been replaced by the cent and the millioctave. The savart is practically the same as the earlier heptameride (eptameride), one seventh of a meride (). One tenth of an heptameride is a decameride () and a hundredth of an heptameride (thousandth of a decade) is approximately one jot (). Definition If \frac is the ratio of frequencies of a given interval, the corresponding measure in savarts is given by: s = 1000 \log_ or \frac = 10^ Like the more common cent, the savart is a logarithmic measure, and thus intervals can be added by simply adding their savart values, instead of multiplying them as you would frequencies. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
IEEE
The Institute of Electrical and Electronics Engineers (IEEE) is an American 501(c)(3) organization, 501(c)(3) public charity professional organization for electrical engineering, electronics engineering, and other related disciplines. The IEEE has a corporate office in New York City and an operations center in Piscataway, New Jersey. The IEEE was formed in 1963 as an amalgamation of the American Institute of Electrical Engineers and the Institute of Radio Engineers. History The IEEE traces its founding to 1884 and the American Institute of Electrical Engineers. In 1912, the rival Institute of Radio Engineers was formed. Although the AIEE was initially larger, the IRE attracted more students and was larger by the mid-1950s. The AIEE and IRE merged in 1963. The IEEE is headquartered in New York City, but most business is done at the IEEE Operations Center in Piscataway, New Jersey, opened in 1975. The Australian Section of the IEEE existed between 1972 and 1985, after which it s ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
IEEE Journal Of Oceanic Engineering
The IEEE Journal of Oceanic Engineering is a journal published by the Institute of Electrical and Electronics Engineers. The journal's editor in chief is Associate Professor Mandar Chitre, of the National University of Singapore. According to the ''Journal Citation Reports'', the journal has a 2022 impact factor The impact factor (IF) or journal impact factor (JIF) of an academic journal is a type of journal ranking. Journals with higher impact factor values are considered more prestigious or important within their field. The Impact Factor of a journa ... of 4.2. References External links * Engineering journals Oceanic Engineering, IEEE Journal of Marine engineering {{Engineering-journal-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tritonic Scale
A tritonic scale is a musical scale or mode with three notes per octave. This is in contrast to a heptatonic (seven-note) scale such as the major scale and minor scale, or a dodecatonic (chromatic 12-note) scale, both common in modern Western music. Tritonic scales are not common in modern art music, and are generally associated with indigenous and prehistoric music.Onkar Prasad,Tribal Music: Its Proper Context, in ''Tribal Thought and Culture: Essays in Honour of Surajit Chandra Sinha'', edited by Baidyanath Saraswati, 131–49 (New Delhi: Concept Publishing Company, 1991): 131 (accessed 18 January 2020) Distribution India Early Indian Rig Vedic hymns were tri-tonic, sung in three pitches with no octave: Udatta, Anudatta, and Swarita. Maori In a 1969 study, Mervyn McLean noted that tritonic scales were the most common among the Maori tribes he surveyed, comprising 47% of the scales used. South America The pre-Hispanic '' herranza'' ritual music of the Andes is general ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pseudo-octave
In music theory, a pseudo-octave, pseudooctave, or paradoxical octave is an interval whose ratio of frequencies is not exactly expected for perfectly harmonic pitches, but slightly wider or narrower in pitch – for example , , or even as large as The pseudo-octave is never-the-less perceived as if it were equivalent to the conventional 2:1 harmonic ratio, and consequently is treated the same: Pitches separated by a pseudo-octave appropriate for a given instrument are considered equivalent to each other just as with normal ''"pitch classes"'' (which are typically explained only in terms of the idealized 2:1 octave). Stretched octave The stretched octave, for example rather than (an 8.6 cent pitch difference), sounds ''out of tune'' when played with ideal harmonic overtones, but ''in tune'' when played with lower notes whose overtones are themselves naturally stretched by an equivalent amount. In piano tuning, stretched octaves are commonly encou ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Octave Band
An octave band is a frequency band that spans one octave (). In this context an octave can be a factor of 2 or a factor of . An octave of 1200 cents in musical pitch (a logarithmic unit) corresponds to a frequency ratio of A general system of scale of ''octave bands'' and ''one-third octave'' bands has been developed for frequency analysis in general, most specifically for acoustics. A ''band'' is said to be an octave in width when the upper band frequency is approximately twice the lower band frequency. Fractional octave bands A whole frequency range can be divided into sets of frequencies called ''bands'', with each band covering a specific range of frequencies. For example, radio frequencies are divided into multiple levels of band divisions and subdivisions, and rather than octaves, the highest level of radio bands (VLF, LF, MF, HF, VHF, etc.) are divided up by the wavelengths' power of ten (''decads'', or ''decils'') that is the same for all radio waves in th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Decibel
The decibel (symbol: dB) is a relative unit of measurement equal to one tenth of a bel (B). It expresses the ratio of two values of a Power, root-power, and field quantities, power or root-power quantity on a logarithmic scale. Two signals whose level (logarithmic quantity), levels differ by one decibel have a power ratio of 101/10 (approximately ) or root-power ratio of 101/20 (approximately ). The strict original usage above only expresses a relative change. However, the word decibel has since also been used for expressing an Absolute scale, absolute value that is relative to some fixed reference value, in which case the dB symbol is often suffixed with letter codes that indicate the reference value. For example, for the reference value of 1 volt, a common suffix is "#Voltage, V" (e.g., "20 dBV"). As it originated from a need to express power ratios, two principal types of scaling of the decibel are used to provide consistency depending on whether the scaling refer ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
ANSI
The American National Standards Institute (ANSI ) is a private nonprofit organization that oversees the development of voluntary consensus standards for products, services, processes, systems, and personnel in the United States. The organization also coordinates U.S. standards with international standards so that American products can be used worldwide. ANSI accredits standards that are developed by representatives of other standards organizations, government agencies, consumer groups, companies, and others. These standards ensure that the characteristics and performance of products are consistent, that people use the same definitions and terms, and that products are tested the same way. ANSI also accredits organizations that carry out product or personnel certification in accordance with requirements defined in international standards. The organization's headquarters are in Washington, D.C. ANSI's operations office is located in New York City. The ANSI annual operating ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Logarithmic Unit
A logarithmic scale (or log scale) is a method used to display numerical data that spans a broad range of values, especially when there are significant differences among the magnitudes of the numbers involved. Unlike a linear scale where each unit of distance corresponds to the same increment, on a logarithmic scale each unit of length is a multiple of some base value raised to a power, and corresponds to the multiplication of the previous value in the scale by the base value. In common use, logarithmic scales are in base 10 (unless otherwise specified). A logarithmic scale is nonlinear, and as such numbers with equal distance between them such as 1, 2, 3, 4, 5 are not equally spaced. Equally spaced values on a logarithmic scale have exponents that increment uniformly. Examples of equally spaced values are 10, 100, 1000, 10000, and 100000 (i.e., 101, 102, 103, 104, 105) and 2, 4, 8, 16, and 32 (i.e., 21, 22, 23, 24, 25). Exponential growth curves are often depicted on a logar ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
International Electrotechnical Commission
The International Electrotechnical Commission (IEC; ) is an international standards organization that prepares and publishes international standards for all electrical, electronics, electronic and related technologies. IEC standards cover a vast range of technologies from power generation, transmission and distribution to home appliances and office equipment, semiconductors, fibre optics, batteries, solar energy, nanotechnology, and marine energy, as well as many others. The IEC also manages four global conformity assessment systems that certify whether equipment, system or components conform to its international standards. All electrotechnologies are covered by IEC Standards, including energy production and distribution, electronics, magnetics and electromagnetics, electroacoustics, multimedia, telecommunications and medical technology, as well as associated general disciplines such as terminology and symbols, electromagnetic compatibility, measurement and performance, dependa ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
2017
2017 was designated as the International Year of Sustainable Tourism for Development by the United Nations General Assembly. Events January * January 1 – Istanbul nightclub shooting: A gunman dressed as Santa Claus opens fire at the Reina nightclub in Istanbul, Turkey, killing 39 people and injuring 79 others. * January 8 – 2017 Jerusalem truck attack: A Palestinian assailant entered the road where the Israeli defense forces were located with a truck, killing 4 people and injuring 15 others. * January 16 – Turkish Airlines Flight 6491, a cargo flight en route from Hong Kong to Istanbul via Bishkek, Kyrgyzstan, crashes in a residential area while attempting to land at Manas International Airport, Bishkek, killing all four crew members on board and 35 people on the ground. * January 19 – 2016–2017 Gambian constitutional crisis: The Economic Community of West African States (ECOWAS) launches a ECOWAS military intervention in the Gambia, military intervention in t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
