|
Distributed Mode Loudspeaker
Distributed Mode Loudspeaker (DML) is a flat panel loudspeaker technology, developed by NXT, in which sound is produced by inducing uniformly distributed vibration mode shape, modes in the panel through a special electro-acoustic exciter. Distributed mode loudspeakers function differently from most others, which typically produce sound by inducing pistonic motion in the diaphragm (acoustics), diaphragm. Exciters for distributed mode loudspeakers include, but are not limited to, moving coil and piezoelectric devices, and are placed to correspond to the natural resonant model of the panel. Applications NXT licenses two classes of distributed mode loudspeaker: SurfaceSound for traditional flat-panel applications, and SoundVu for applications in which sound is produced directly in front of the display (either through a projection screen which functions as a DML or a transparent DML overlaid on the display). SurfaceSound technology has been incorporated into a number of novel products su ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Loudspeaker
A loudspeaker (commonly referred to as a speaker or speaker driver) is an electroacoustic transducer that converts an electrical audio signal into a corresponding sound. A ''speaker system'', also often simply referred to as a "speaker" or "loudspeaker", comprises one or more such speaker ''drivers'', an enclosure, and electrical connections possibly including a crossover network. The speaker driver can be viewed as a linear motor attached to a diaphragm which couples that motor's movement to motion of air, that is, sound. An audio signal, typically from a microphone, recording, or radio broadcast, is amplified electronically to a power level capable of driving that motor in order to reproduce the sound corresponding to the original unamplified electronic signal. This is thus the opposite function to the microphone; indeed the ''dynamic speaker'' driver, by far the most common type, is a linear motor in the same basic configuration as the dynamic microphone which uses such ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tweeter
A tweeter or treble speaker is a special type of loudspeaker (usually dome, inverse dome or horn-type) that is designed to produce high audio frequencies, typically deliver high frequencies up to 100 kHz. The name is derived from the high pitched sounds made by some birds (tweets), especially in contrast to the low woofs made by many dogs, after which low-frequency drivers are named (woofers). Operation Nearly all tweeters are electrodynamic drivers using a voice coil suspended within a fixed magnetic field. These designs operate by applying current from the output of an amplifier circuit to a coil of wire called a voice coil. The voice coil produces a varying magnetic field, which works against the fixed magnetic field of a permanent magnet around which the cylindrical voice coil is suspended, forcing the voice coil and the diaphragm attached to it to move. This mechanical movement resembles the waveform of the electronic signal supplied from the amplifier's output ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Reed Business Information
RELX plc (pronounced "Rel-ex") is a British multinational information and analytics company headquartered in London, England. Its businesses provide scientific, technical and medical information and analytics; legal information and analytics; decision-making tools; and organise exhibitions. It operates in 40 countries and serves customers in over 180 nations. It was previously known as Reed Elsevier, and came into being in 1993 as a result of the merger of Reed International, a British trade book and magazine publisher, and Elsevier, a Netherlands-based scientific publisher. The company is publicly listed, with shares traded on the London Stock Exchange, Amsterdam Stock Exchange and New York Stock Exchange (ticker symbols: London: REL, Amsterdam: REN, New York: RELX). The company is one of the constituents of the FTSE 100 Index, Financial Times Global 500 and Euronext 100 Index. History The company, which was previously known as Reed Elsevier, came into being in 1993, as a r ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
EDN (magazine)
''EDN'' is an electronics industry website and formerly a magazine owned by AspenCore Media, an Arrow Electronics company. The editor-in-chief is Majeed Ahmad. ''EDN'' was published monthly until, in April 2013, EDN announced that the print edition would cease publication after the June 2013 issue. History The first issue of ''Electrical Design News'', the original name, was published in May 1956 by Rogers Corporation of Englewood, Colorado. In January 1961, Cahners Publishing Company, Inc., of Boston, acquired Rogers Publishing Company. In February 1966, Cahners sold 40% of its company to International Publishing Company in London In 1970, the Reed Group merged with International Publishing Corporation and changed its name to Reed International Limited. Acquisition of ''EEE'' magazine Cahners Publishing Company acquired ''Electronic Equipment Engineering'', a monthly magazine, in March 1971 and discontinued it. In doing so, Cahners folded ''EEE's'' best features into ''EDN'', and ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Penton Media
Penton was an information services and marketing company. The company's three largest revenue streams came from events, digital and marketing services. Although Penton had a long history (see below) as a trade publisher, in 2015 it reported that 35 percent of its EBITDA derived from digital products, 54 percent from events, and 11 percent from print. The main industry segments served by Penton include agriculture, transportation, natural products/food, infrastructure, and design and manufacturing. The company was descended from Penton Publishing, founded by John Penton in Cleveland in 1904 to bring together production of several trade magazine titles, including ''Foundry'', which he had created in Detroit in 1892. However, after the Penton/Prism merger, the company is now headquartered in New York City, although it continues to maintain offices in Cleveland and other U.S. cities, with an employee base of approximately 1,350 people. Due to reduced advertising sales as customers s ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Wave Field Synthesis
Wave field synthesis (WFS) is a spatial audio rendering technique, characterized by creation of virtual acoustic space, acoustic environments. It produces ''artificial'' wavefronts synthesized by a large number of individually driven loudspeakers. Such wavefronts seem to originate from a virtual starting point, the ''virtual source'' or ''notional source''. Contrary to traditional spatialization techniques such as stereophonic sound, stereo or surround sound, the localization of virtual sources in WFS does not depend on or change with the listener's position. Physical fundamentals WFS is based on the Huygens–Fresnel principle, which states that any wavefront can be regarded as a superposition of elementary spherical waves. Therefore, any wavefront can be synthesized from such elementary waves. In practice, a computer controls a large array of individual loudspeakers and actuates each one at exactly the time when the desired virtual wavefront would pass through it. The basic ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Delft University Of Technology
Delft University of Technology ( nl, Technische Universiteit Delft), also known as TU Delft, is the oldest and largest Dutch public technical university, located in Delft, Netherlands. As of 2022 it is ranked by QS World University Rankings among the top 10 engineering and technology universities in the world. In the fields of architecture and civil engineering, it was ranked 2nd in the world, after MIT (Massachusetts Institute of Technology). With eight faculties and numerous research institutes, it has more than 26,000 students (undergraduate and postgraduate) and 6,000 employees (teaching, research, support and management staff). The university was established on 8 January 1842 by William II of the Netherlands as a Royal Academy, with the primary purpose of training civil servants for work in the Dutch East Indies. The school expanded its research and education curriculum over time, becoming a polytechnic school in 1864 and an institute of technology (making it a full-fledged ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Full-range
A full-range loudspeaker drive unit is defined as a driver which reproduces as much of the audible frequency range as possible, within the limitations imposed by the physical constraints of a specific design. The frequency range of these drivers is maximized through the use of a whizzer cone and other means. Most single driver systems, such as those in radios, or small computer speaker designs, cannot reproduce all of the audible frequencies or the entire audible audio range (i.e., sound within the range of human hearing). Typical designs Typically, a full-range drive unit consists of a single driver element, or ''voice coil'', used to move and control a ''diaphragm''. Often the cone structure includes optimizations to enhance high-frequency performance. For example, a small low-mass horn or whizzer cone can be mounted where the voice coil and diaphragm meet, thereby increasing the output at high frequencies. The shape and materials used in the cone and whizzer are highly op ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mid-range Speaker
A mid-range speaker is a loudspeaker driver that reproduces sound in the frequency range from 250 to 2000 Hz. It is also known as a squawker. Mid-range drivers are usually cone types or, less commonly, dome types, or compression horn drivers. The radiating diaphragm of a cone mid-range unit is a truncated cone, with a voice coil attached at the neck, along with the spider portion of the suspension, and with the cone surround at the wide end. Cone mid-range drivers typically resemble small woofers. The most common material used for mid-range cones is paper, occasionally impregnated and/or surface-treated with polymers or resins in order to improve vibrational damping. Other mid-range cone materials include plastics such as polypropylene, Cobex, Bextrene, woven Kevlar, fiberglass, carbon fiber, or light metal alloys based on aluminium, magnesium, titanium, or other alloys. The radiating surface of a dome mid-range is typically a 90-degree section of a sphere, made from cloth, metal ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mode Shape
A normal mode of a dynamical system is a pattern of motion in which all parts of the system move sinusoidally with the same frequency and with a fixed phase relation. The free motion described by the normal modes takes place at fixed frequencies. These fixed frequencies of the normal modes of a system are known as its natural frequency, natural frequencies or Resonance, resonant frequencies. A physical object, such as a building, bridge, or molecule, has a set of normal modes and their natural frequencies that depend on its structure, materials and boundary conditions. The most general motion of a system is a Superposition principle, superposition of its normal modes. The modes are normal in the sense that they can move independently, that is to say that an excitation of one mode will never cause motion of a different mode. In mathematical terms, normal modes are Orthogonality, orthogonal to each other. General definitions Mode In the Wave, wave theory of physics and ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Haymarket Group
Haymarket Media Group is a privately held media company headquartered in London. It has publications in the consumer, business and customer sectors, both print and online. It operates exhibitions allied to its own publications, and previously on behalf of organisations such as the BBC. The company expanded outside the UK in 1999. History Haymarket began in the 1950s, under the name Cornmarket Press. Clive Labovitch and Michael Heseltine – later a Cabinet minister under Margaret Thatcher and Deputy Prime Minister under John Major – who had met at university, started out with the 1957 ''Directory of Opportunities for Graduates'', and in 1959 relaunched ''Man About Town'', which was to become an influential (if unprofitable) men's consumer magazine. The company failed in its relaunch of the British news weekly ''Topic'', the title closing at the end of 1962, within three months of the takeover. The partners split in 1965, with Heseltine renaming his half of the business Haymarke ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
What Hi-Fi? Sound And Vision
''What Hi-Fi?'' is a magazine published thirteen times a year by Future. It is a buying guide for consumer electronics, featuring news, reviews and features on hi-fi, home cinema, television and home audio. The brand also has a websitewhathifi.com These product categories include stereo speakers, TVs, amplifiers, headphones, soundbars, projectors, tablets and turntables. Brands features on the website and magazine cover include Bowers & Wilkins, KEF, Naim, LG and Sony. Reviews are written in-house at dedicated testing facilities, currently found in London, Reading and Bath. The magazine has nine international editions, and its publisher claims that its total readership is in excess of one million per issue. The ''What Hi-Fi?'' website has a consistently updated library of audio and video hardware reviews, plus news, features, advice and opinion from the editorial team. In the course of 2017, the website reached over 24 million unique users. ''What Hi-Fi?'' was sold to Future ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
