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Bandwidth is the difference between the upper and lower frequencies in a continuous band of frequencies. It is typically measured in hertz, and depending on context, may specifically refer to passband bandwidth or baseband bandwidth. Passband bandwidth is the difference between the upper and lower cutoff frequencies of, for example, a band-pass filter, a communication channel, or a signal spectrum. Baseband bandwidth applies to a low-pass filter or baseband signal; the bandwidth is equal to its upper cutoff frequency.
A logic gate is an idealized or physical electronic device implementing a Boolean function, a logical operation performed on one or more binary inputs that produces a single binary output. Depending on the context, the term may refer to an ideal logic gate, one that has for instance zero rise time and unlimited fan-out, or it may refer to a non-ideal physical device.
In statistics, a power law is a functional relationship between two quantities, where a relative change in one quantity results in a proportional relative change in the other quantity, independent of the initial size of those quantities: one quantity varies as a power of another. For instance, considering the area of a square in terms of the length of its side, if the length is doubled, the area is multiplied by a factor of four.
A parameter, generally, is any characteristic that can help in defining or classifying a particular system. That is, a parameter is an element of a system that is useful, or critical, when identifying the system, or when evaluating its performance, status, condition, etc.
Digital Signal 0 (DS0) is a basic digital signaling rate of 64 kilobits per second (kbit/s), corresponding to the capacity of one analog voice-frequency-equivalent communication channel. The DS0 rate, and its equivalents E0 in the E-carrier system and T0 in the T-carrier system, form the basis for the digital multiplex transmission hierarchy in telecommunications systems used in North America, Europe, Japan, and the rest of the world, for both the early plesiochronous systems such as T-carrier and for modern synchronous systems such as SDH/SONET.
Surround sound is a technique for enriching the fidelity and depth of sound reproduction by using multiple audio channels from speakers that surround the listener. Its first application was in movie theaters. Prior to surround sound, theater sound systems commonly had three "screen channels" of sound, from loudspeakers located in front of the audience at the left, center, and right. Surround sound adds one or more channels from loudspeakers behind the listener, able to create the sensation of sound coming from any horizontal direction 360° around the listener. Surround sound formats vary in reproduction and recording methods along with the number and positioning of additional channels. The most common surround sound specification, the ITU's 5.1 standard, calls for 6 speakers: Center (C) in front of the listener, Left (L) and Right (R) at angles of 60° on either side of the center, and Left Surround (LS) and Right Surround (RS) at angles of 100–120°, plus a subwoofer whose position is not critical.
Multichannel marketing is the blending of different distribution and promotional channels for the purpose of marketing. Distribution channels include a retail storefront, a website, or a mail-order catalogue.
HSN, formerly Home Shopping Network, is an American free-to-air television network owned by the Qurate Retail Group, which also owns catalog company Cornerstone Brands. Based in the Gateway area of St. Petersburg, Florida, United States, the home shopping channel has former and current sister channels in several other countries. HSN also has an online outlet at HSN.com.
Cox Communications is an American company that provides digital cable television, telecommunications and Home Automation services in the United States. It is the third-largest cable television provider in the United States, serving more than 6.2 million customers, including 2.9 million digital cable subscribers, 3.5 million Internet subscribers, and almost 3.2 million digital telephone subscribers, making it the seventh-largest telephone carrier in the country. Cox is headquartered at 6205 Peachtree Dunwoody Rd in Sandy Springs, Georgia, U.S., in the Atlanta metropolitan area. It is a privately-owned subsidiary of Cox Enterprises.
PMR446 is a licence exempt service in the UHF radio frequency band and is available for business and personal use in most countries throughout the European Union.
A mesh network is a local network topology in which the infrastructure nodes connect directly, dynamically and non-hierarchically to as many other nodes as possible and cooperate with one another to efficiently route data from/to clients. This lack of dependency on one node allows for every node to participate in the relay of information. Mesh networks dynamically self-organize and self-configure, which can reduce installation overhead. The ability to self-configure enables dynamic distribution of workloads, particularly in the event a few nodes should fail. This in turn contributes to fault-tolerance and reduced maintenance costs.
Altice USA, Inc., commonly known as Altice, is an American cable television provider with headquarters in New York City. It delivers pay television, Internet access, telephone services, and original television content to approximately 4.9 million residential and business customers in 21 states.
AT&T U-verse, commonly called U-verse, was an AT&T brand of triple-play telecommunications services, although the brand is now only used in reference to the IPTV service. Launched on June 26, 2006, U-verse included broadband Internet, IP telephone, and IPTV services in 48 states.
Sky Multichannels, also known as Sky Analogue was a package of analogue television channels offered by BSkyB on the Astra satellites at 19.2° east. from 1 September 1993 to 27 September 2001, which started off with 15 channels before expanding to over 40.
MPEG Surround, also known as Spatial Audio Coding (SAC) is a glossy compression format for surround sound that provides a method for extending mono or stereo audio services to multi-channel audio in a backwards compatible fashion. The total bit rates used for the core and the MPEG Surround data are typically only slightly higher than the bit rates used for coding of the core. MPEG Surround adds a side-information stream to the core bit stream, containing spatial image data. Legacy stereo playback systems will ignore this side-information while players supporting MPEG Surround decoding will output the reconstructed multi-channel audio.
ISO 80000 or IEC 80000 is an international standard developed and promulgated jointly by the International Organization for Standardization (ISO) and the International Electrotechnical Commission (IEC).
Multichannel television in the United States has been available since at least 1948. The United States is served by multichannel television through cable television systems, direct-broadcast satellite providers, and various other wireline video providers; among the largest television providers in the U.S. are AT&T, Altice USA, Charter Communications, Comcast, Dish Network, and Verizon Communications. The Telecommunications Act of 1996 defines a multichannel video programming distributor (MVPD) as "a person such as, but not limited to, a cable operator, a multichannel multipoint distribution service, a direct broadcast satellite service, or a television receive-only satellite program distributor, who makes available for purchase, by subscribers or customers, multiple channels of video programming", where a channel is defined as a "signaling path provided by a cable television system."
In probability and statistics, the Tweedie distributions are a family of probability distributions which include the purely continuous normal, gamma and Inverse Gaussian distributions, the purely discrete scaled Poisson distribution, and the class of compound Poisson–gamma distributions which have positive mass at zero, but are otherwise continuous. Tweedie distributions are a special case of exponential dispersion models and are often used as distributions for generalized linear models.
The digital transition in the United States was the switchover from analog to exclusively digital broadcasting of terrestrial television television programming. According to David Rehr, then president and CEO of the National Association of Broadcasters, this transition represented "the most significant advancement of television technology since color TV was introduced." For full-power TV stations, the transition went into effect on June 12, 2009, with stations ending regular programming on their analog signals no later than 11:59 p.m. local time that day.
High-definition television in Australia is available via cable, IPTV, satellite and terrestrial television. The first high-definition broadcasts began in 2001 and since then the number of channels available to view has grown to a maximum of 27 that can be viewed on pay-TV service, Foxtel.
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