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Digital Mobile Radio
Digital mobile radio (DMR) is a specification for commercial products so they can interoperate. It is defined by a standard created by the European Telecommunications Standards Institute (ETSI), and is designed to be low-cost and easy to use. DMR, along with P25 phase II and NXDN are the main competitor technologies in achieving 6.25 kHz equivalent bandwidth using the proprietary AMBE+2 vocoder. DMR and P25 II both use two-slot TDMA in a 12.5 kHz channel, while NXDN uses discrete 6.25 kHz channels using frequency division and TETRA uses a four-slot TDMA in a 25 kHz channel. DMR was designed with three tiers. DMR tiers I and II (conventional) were first published in 2005, and DMR III (Trunked version) was published in 2012, with manufacturers producing products within a few years of each publication. The primary goal of the standard is to specify a digital system with low complexity, low cost and interoperability across brands, so radio communications purchasers a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
European Telecommunications Standards Institute
The European Telecommunications Standards Institute (ETSI) is an independent, not-for-profit, standardization organization in the field of Information and communications technology, information and communications. ETSI supports the development and testing of global technical standards for ICT-enabled systems, applications and services. Overview ETSI was set up in 1988 by the European Conference of Postal and Telecommunications Administrations (European Conference of Postal and Telecommunications Administrations, CEPT) following a proposal from the European Commission. ETSI is the officially recognized body with a responsibility for the standardization of Information and Communication Technologies (ICT). It is one of the three bodies, the others being European Committee for Standardization, CEN and CENELEC, officially recognized by the European Union as a European Standards Organization (ESO). The role of the European Standards Organizations is to support EU regulation and poli ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
DMR Tier 3 Portable Radio
DMR is an initialism that may refer to: Biology * Differentially methylated regions, a genomic region that is methylated differentially on each parental allele * Dwarf mistletoe rating system, a scale for rating the severity of a dwarf mistletoe infection Government * Device Master Record, a folder containing a technical description of a device controlled by regulating authorities (such as the US Food and Drug Administration) * Discharge Monitoring Report, submission report to the United States Environmental Protection Agency * Department of Main Roads (New South Wales), Australia * Department of Main Roads (Queensland), Australia Media * ''Dance Music Report'', bi-weekly U.S. trade magazine * ''The Des Moines Register'', daily morning newspaper in Des Moines, Iowa * DMR Books, small Chicago-based book publisher Technology * Device Master Record, a compilation of all the instructions, drawings and other records that must be used to produce a product * Differential Microwave ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Vocoder
A vocoder (, a portmanteau of ''voice'' and ''encoder'') is a category of speech coding that analyzes and synthesizes the human voice signal for audio data compression, multiplexing, voice encryption or voice transformation. The vocoder was invented in 1938 by Homer Dudley at Bell Labs as a means of synthesizing human speech. This work was developed into the channel vocoder which was used as a voice codec for telecommunications for speech coding to conserve bandwidth in transmission. By encrypting the control signals, voice transmission can be secured against interception. Its primary use in this fashion is for secure radio communication. The advantage of this method of encryption is that none of the original signal is sent, only envelopes of the bandpass filters. The receiving unit needs to be set up in the same filter configuration to re-synthesize a version of the original signal spectrum. The vocoder has also been used extensively as an electronic musical instrument. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Icom Incorporated
is a Japanese manufacturer of radio transmitting and receiving equipment, founded in 1954 by Tokuzo Inoue with the company's original name being "Inoue". Its products now include equipment for radio amateurs, pilots, maritime applications, land mobile professional applications and radio scanner enthusiasts. Its headquarters are in Osaka, Japan, with branch offices in the United States (in Kirkland, Washington), Canada (in Delta, British Columbia), Australia (Melbourne, Victoria), New Zealand (Auckland), the United Kingdom (Kent, England), France (Toulouse), Germany (Bad Soden), Spain (Barcelona) and the People's Republic of China (Beijing). Protocols IDAS IDAS is Icom's implementation of the NXDN protocol for two-way digital radio products intended for commercial Private Land Mobile Radio (PLMR) and low-end public safety communications systems. NXDN is a Common Air Interface (CAI) technical standard for mobile communications. It was developed jointly by Icom and Kenwood Corpor ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Kenwood Corporation
is a Japanese brand of consumer electronics. It has been owned by JVCKenwood ever since October 2011, when Kenwood Corporation merged with JVC. Kenwood manufactures audio equipment such as cassette tape decks/recorders, amateur radio (ham) equipment, radios, cellular phones, speakers, and other consumer electronics. History The company was established in 1946 as the Kasuga Radio Co. Ltd. in Komagane City, Nagano Prefecture, Japan. In 1960, the company was renamed Trio Corporation. In 1963, the first overseas office was founded in Los Angeles County, California, USA. In the early 1960s, Trio's products were rebranded by the Lafayette Radio Company, with a focus on citizens' band radio. A&A Trading Co. was an importer of Japanese-made electronics for RadioShack, and a bilingual Japanese-speaking manager from A&A, William "Bill" Kasuga, partnered with George Aratani and Yoichi Nakase to establish a company that would be the exclusive importer of Trio products."Entrepreneur Bil ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Vertex Standard
Vertex, vertices or vertexes may refer to: Science and technology Mathematics and computer science *Vertex (geometry), a point where two or more curves, lines, or edges meet *Vertex (computer graphics), a data structure that describes the position of a point *Vertex (curve), a point of a plane curve where the first derivative of curvature is zero *Vertex (graph theory), the fundamental unit of which graphs are formed *Vertex (topography), in a triangulated irregular network *Vertex of a representation, in finite group theory Physics *Vertex (physics), the reconstructed location of an individual particle collision *Vertex (optics), a point where the optical axis crosses an optical surface *Vertex function, describing the interaction between a photon and an electron Biology and anatomy *Vertex (anatomy), the highest point of the head * Vertex (urinary bladder), alternative name of the apex of urinary bladder *Vertex distance, the distance between the surface of the cornea of the e ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sanchar Communication
''Sanchar'' is an Indian Marathi daily broadsheet newspaper based in Solapur Solapur () is a city located in the south-western region of the Indian state of Maharashtra, close to its border with Karnataka. Solapur is located on major highway, rail routes between Mumbai, Pune, Bangalore and Hyderabad, with a branch line ..., India. It was founded by Shri M B Kadadi, Ranga Vaidya & Raman Gandhi on 13 October 1961, and is currently owned by Sangam Papers Corporation. The current Editor, Printer, Publisher of "Sanchar" is Mr. Dharmraj Annaraj Kadadi. Mr Annaraj Dharmraj Kadadi & Smt Sushila Raman Gandhi are the other Partners in Sangam Papers Corporation. The office of "Sanchar" is situated at Sanchar Building, Hotgi Road, Solapur 413003 (Maharashtra, India) References External links Official website Solapur Marathi-language newspapers Newspapers published in Maharashtra Asian news websites 1961 establishments in Maharashtra Publications established in 1961 {{India ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hytera
Hytera (; previously HYT; ) is a Chinese publicly-traded and partly state-owned manufacturer of radio transceivers and radio systems founded in Shenzhen, Guangdong in 1993. Hytera is listed on the Shenzhen Stock Exchange and is partly owned by Shenzhen Investment Holdings of Shenzhen's municipal government. Hytera is major contributor to the PDT Standard, which is designed for public safety organizations in China. The company is a major supplier to China's Ministry of Public Security. Locations and subsidiaries The company's head office is in Shenzhen, China. Hytera's products are developed at three development sites in total. One of the development sites is located in Bad Münder, Germany. In March 2012 Hytera acquired the German company Rohde & Schwarz Professional Mobile Radio GmbH from the German electronics group Rohde & Schwarz, which is now known as Hytera Mobilfunk. In addition, there are Hytera subsidiaries in the US, UK, Canada, and Spain. United States In June 20 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Motorola
Motorola, Inc. () was an American Multinational corporation, multinational telecommunications company based in Schaumburg, Illinois, United States. After having lost $4.3 billion from 2007 to 2009, the company split into two independent public companies, Motorola Mobility and Motorola Solutions on January 4, 2011. Motorola Solutions is the legal successor to Motorola, Inc., as the reorganization was structured with Motorola Mobility being spun off. Motorola Mobility was acquired by Lenovo in 2014. Motorola designed and sold wireless network equipment such as cellular transmission base stations and signal amplifiers. Motorola's home and broadcast network products included set-top boxes, digital video recorders, and network equipment used to enable video broadcasting, computer telephony, and high-definition television. Its business and government customers consisted mainly of wireless voice and broadband systems (used to build private networks), and, public safety communicat ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tait Communications
Tait Communications is a multinational radio communications company with headquarters based in Christchurch, New Zealand. The company has offices in 17 countries and employs 869 staff (2011). Tait develops voice and data radio technologies, exporting about 95% of products from its Christchurch manufacturing base. Customers include London Buses, Country Fire Authority and Basin Electric Power Cooperative. Competitors include Motorola, Harris Corporation, E.F. Johnson Company, Raytheon, HYT, Selex and EMC spa. History Tait Limited (trading as Tait Communications and formerly known as Tait Electronics Ltd) was founded in 1969 by New Zealand electronics innovator and businessman Sir Angus Tait, KNZM, OBE. The company's founding staff of 12 radio technologists produced the first generation of all-transistor mobile radios in New Zealand.http://www.victoria.ac.nz/canz/research/docs/tait.pdf * In 1973, Tait released the Mini-phone series of mobile radios, which were adopted as t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
