ms Lebar jalur pt Largura de banda telecomunica es ro Vitez de transfer de date simple Bandwidthcomputing ...Other uses Bandwidth disambiguation Bandwidth Wiktionary Bandwidth In computer networking and computer science , the words bandwidth , ref Andrew S. Tanenbaum http books.google.com books?id Pd z64SJRBAC ...&sa X&oi book result&ct result&resnum 1&ved 0CC8Q6AEwAA v snippet&q bandwidth 20kbps&f false Computer networks , Prentice Hall PTR, 2003 ref network bandwidth , ref Douglas Comer , http books.google.com books?id tm evHmOs3oC&pg PA99&dq 22network bandwidth 22 22computer networks 22&hl en&ei ... Networks and Internets , page 99 ff, Prentice Hall 2008. ref data bandwidth , ref Fred Halsall ... bandwidth 22 22computer networks 22&q 22data bandwidth 22 Introduction to data communications and computer networks , page 108, Addison Wesley, 1985. ref or digital bandwidth ref http books.google.com books?ei rfmcTPKEN5L6swOekeXVAQ&ct result&hl en&id 7gqsZmr5HJcC&dq 22digital bandwidth 22 22computer networks 22&q 22digital bandwidth 22 Cisco Networking Academy Program CCNA 1 and 2 companion guide ... search?q 22network bandwidth 22&btnG Search Books&tbm bks&tbo 1 Search in Google Books for textbooks on Network bandwidth 96.900 hits in April 2012 ref as well as scientific papers, patents and standards ref http scholar.google.se scholar?hl en&q 22network bandwidth 22 &btnG Search&as sdt 0 2C5&as ylo &as vis 0 Search in google scholar for academic research papers on Network bandwidth 84.500 ... , digital communications , electronics , etc., the word bandwidth is used to refer to analog signal bandwidth measured in hertz the original meaning of the term. citation needed date April 2012 Some ... capacity and throughput rather than the colloquial use of the word bandwidth for bit s, to avoid this confusion. Network bandwidth capacity In computer networking, bandwidth in bit s sometimes defines ... system. For example, bandwidth test s measure the maximum throughput of a computer network ... more details
wiktionary Bandwidth has several related meanings Bandwidth signal processing or analog bandwidth , frequency bandwidth or radio bandwidth a measure of the width of a range of frequencies, measured in hertz Bandwidthcomputing or digital bandwidth a rate of data transfer, bit rate or throughput, measured in bits per second bps Spectral linewidth the width of an atomic or molecular spectral line, measured in hertz Bandwidth can also refer to Bandwidth linear algebra , the width of the non zero terms around the diagonal of a matrix In kernel density estimation , bandwidth describes the width of the convolution kernel used A normative expected range of linguistic behavior in language expectancy theory In list of buzzwords business jargon , the resources needed to complete a task or project Bandwidth radio program A Canadian radio program Graph bandwidth , in graph theory disambig ar da B ndbredde ... more details
A bandwidth hog is a derogatory term for a user of an internet connection who uses more Bandwidthcomputingbandwidth than other users on the network. ISPs now refer to bandwidth hogs as heavy users in an attempt to avoid backlash by the public. Most ISPs bandwidth throttling throttle their customer s Internet connection 24 7 so bandwidth hog is virtually non existent from a transfer speed perspective. The term Bandwidth hog is normally not used to refer to those who reach or surpass bandwidth caps, since the term is used to express constant high speed downloads. External links http arstechnica.com tech policy news 2009 12 bandwidth hogs dont even exist says analyst.ars Bandwidth hogs join unicorns in realm of mythical creatures ArsTechnica.com http www.pcmag.com article2 0,2817,2368000,00.asp FCC Broadband Users Are Getting Half of What They Expect References reflist DEFAULTSORT Bandwidth Hogging Category Internet terminology Category File sharing internet stub ... more details
Unreferenced date December 2006 Orphan date February 2009 In computing , equalization is a type of bandwidth management that makes adjustments to the flow of data along a computer network . By adding Latency engineering latency to low priority tasks, it ensures high priority tasks receive sufficient bandwidth. DEFAULTSORT Equalization Computing Category Computer networks Compu network stub ... more details
In telecommunication , the term bandwidth compression has the following meanings The reduction of the Bandwidthcomputingbandwidth needed to transmit a given amount of data in a given time . The reduction of the time needed to transmit a given amount of data in a given bandwidth. Note Bandwidth compression implies a reduction in normal bandwidth of an information carrying signal information theory signal without reducing the information content of the signal. This can be accomplished with data compression techniques. Source from Federal Standard 1037C and from MIL STD 188 See also Modem Increasing speeds Category Telecommunications terms telecomm term stub ... more details
orphan date September 2009 nofootnotes date December 2009 Bandwidth pooling is used in network switch es to optimize the use of network resources . It allows switch processing cards to be shared by physical interface cards. This innovation frees switch resources that would otherwise be stranded when lower rate interface cards are deployed in an aggregation switch. Bandwidth Pooling in Dedicated Hosting This is a key mechanism for hosting buyers to determine which provider is offering the right pricing mechanism of bandwidth pricing. Most Dedicated Hosting providers bundle bandwidth pricing along with the monthly charge for the dedicated server. Let us illustrate this with the help of an example. An average 100 server from any of the common dedicated bandwidth providers would carry 2 TB of bandwidth. Suppose you purchased 10 servers then you would have the ability to consume 2 TB of bandwidth per server. However, let us assume that given your application architecture only 2 of these 10 servers are really web facing while the rest are used for storage, search, database or other internal functions then the provider that allows bandwidth pooling would let you consume overall 20 TB of bandwidth as incoming or outbound or both depending on their policy. The provider that does not offer bandwidth pooling would just let you use 2 TB of bandwidth and the rest of the 18 TB of bandwidth would be practically unusable. Uses Bandwidth pooling is used in computer and mobile phone networks. References http www.faqs.org patents app 20090046740 Patent title Systems, methods and computer products for pooling of wireless collection bandwidth See also Bandwidthcomputing compu network stub DEFAULTSORT Bandwidth Pooling Category Electronics terms ... more details
Cite check date November 2007 Bandwidth optimization is one of many concerns webmasters deal with when hosting web content. Since most web hosts charge by Bandwidthcomputingbandwidth used or have an account limit on bandwidth, a prudent webmaster will squeeze and Bandwidth compression compress their files as much as possible without affecting the content s integrity. Lately, most web hosts are offering unlimited bandwidth. Reductions in bandwidth usage are measured in negabytes , a unit akin to other negative units such as negawatts , negavolts , negajoules , negameters , and negagrams . Even the simplest bandwidth optimization techniques can reduce bandwidth costs significantly. Owners of extremely high volume web services are especially diligent, and have been known to employ extreme techniques to save a few bytes per page. For example, many staple pages are highly optimized with whitespace and line breaks removed, unneeded quotes removed around HTML attributes, and images compressed to the limit while maintaining clarity. Most bandwidth optimization techniques can fit into one of three categories Efficiency, Compression, and Omission. Efficiency Efficiency techniques involve changing the web content in order to minimize the number of bytes that need to be sent. For example, use external files which will cache instead of inline styles and scripts, reuse icon images, use semantic markup. Fix any broken images, since these often send a verbose 404 error page. Compression Use compression on the server to squash files before they are sent. Compression is a well established technique in telecommunications, since without significant bandwidth compression, the telephone grid could not handle the amount of data that passes through it. On the web the most popular compression algorithm for real time compression is gzip . The topic of compression also includes image compression e.g. JPG, PNG, GIF Also see Wan optimization WAN Optimization Omission Omit unneeded bytes. Remove ... more details
in router computing router s throughout an end to end path. In practical technical terms, the Bandwidth ...RFC 2638 from the IETF defines the entity of the Bandwidth Broker BB in the framework of differentiated services DiffServ . According to RFC 2638, a Bandwidth Broker is an agent that has some knowledge of an organization s priorities and policies and allocates quality of service QoS resources with respect ..., the Bandwidth Broker managing a domain will have to communicate with its adjacent peering peers .... Admission control is one of the main tasks that a Bandwidth Broker has to perform, in order to decide whether an incoming resource reservation request will be accepted or not. Most Bandwidth Brokers ... for EF traffic in the core router computing router s, which together keep queues small and avoid ... PDV. Hence although loosely a BB allocates bandwidth, really it allocates carrier services i.e. QoS resources . Bandwidth Brokers can be configured with organizational policies, keep track of the current ... and current allocation. Bandwidth Brokers only need to establish relationships of limited trust ... Bandwidth Broker Packets are coloured to indicate forwarding behavior Focus on aggregates and NOT on individual ... Services Architecture for the Internet http qbone.internet2.edu bb bboutline2.html QBone Bandwidth Broker Architecture http citeseer.ist.psu.edu sohail02survey.html The Survey of Bandwidth Broker http ... Decoupling QoS Control from Core Routers A Novel Bandwidth Broker Architecture ... Admission Control Algorithm for Bandwidth Brokers http citeseer.ist.psu.edu machiraju02scalable.html A Scalable and Robust Solution for Bandwidth Allocation http w3.tmit.bme.hu ips2004 papers ips2004 003.pdf Implementation of a Simple Bandwidth Broker for DiffServ Networks http www staff.it.uts.edu.au ... A survey on Bandwidth Broker Architecture for Differentiated Services Network http www staff.it.uts.edu.au simmonds BB.htm Research projects developing Bandwidth Broker architectures Category Networks ... more details
Network Neutrality Bandwidth throttling is a reactive measure employed in communication networks in an apparent attempt to regulate network traffic and minimize bandwidth congestion. Bandwidth throttling ... bandwidth throttling to help limit network congestion and server crashes. On a broader level, the Internet Service Provider may use bandwidth throttling to help reduce a user s usage of bandwidth ... sharing applications, as well as even out the usage of the total bandwidth supplied across all users on the network. Bandwidth throttling is also often used in Internet applications, in order to spread ... overloading individual ones, and so reduce their risk of Crash computing crashing , and gain additional revenue by compelling users on to more expensive pricing schemes where bandwidth is not throttled. Operation A computer network typically consists of a number of Server computing servers , which host data and provide services to Client computing clients . The Internet is a good example, in which ..., server crashes. In order to prevent such occurrences, a server administrator may implement bandwidth .... When a server using bandwidth throttling reaches the specified limit, it will offload new requests ... once the bandwidth use reaches an acceptable level, but at peak times the request rate can even exceed the capacities of such queues and requests have to be thrown away. Application A bandwidth intensive device, such as a Server computing server , might limit, or throttle, the rate at which it accepts ... in this practice, where they limit users bandwidth by up to 99 . ref cite web url http broadband.mpi ... Service Providers throttle their users bandwidth, with or without the user ever even realizing ... speeds title Is Your ISP Throttling Your Bandwidth? author netequalizer date March 21, 2009 ... ref Those that could have their bandwidth throttled are typically someone who is constantly downloading ... method of regulating the bandwidth because consumers not getting the required bandwidth ... more details
. Computing the bandwidth Both the unweighted and weighted versions are special cases of the quadratic bottleneck assignment problem . The bandwidth problem is NP hard , even for some special cases. ref ...In graph theory , the graph bandwidth problem to label the n vertices v sub i sub of a graph G with distinct integers f v sub i sub so that the quantity math max , f v i f v j v iv j in E , math is minimized E is the edge set of G . ref harv Chinn Chv talov Dewdney Gibbs 1982 ref The problem may be visualized ... graph layout or linear graph placement . ref name feige The weighted graph bandwidth problem is a generalization ... bandwidth is the bandwidth matrix theory bandwidth of the symmetric matrix which is the adjacency matrix of the graph. Bandwidth formulas for some graphs For several families of graphs , the bandwidth math varphi G math is given by an explicit formula. The bandwidth of a path graph math P n math on n ... 1 vertices has bandwidth math varphi S k lfloor k 1 2 rfloor 1 math . For the hypercube graph math Q n math on math 2 n math vertices the bandwidth was determined by harvtxt Harper 1966 to be math varphi ... of two paths. J. Chvat lov , Discrete Mathematics 11 , 249&ndash 253, 1975. ref that the bandwidth ..., is equal to math min m,n math . Bounds The bandwidth of a graph can be bounded in terms of various ... simple example of a tree graph theory tree , has comparatively large bandwidth. On the other hand ... that the bandwidth is hardness of approximation NP hard to approximate within any constant, and this even ... with the NP Hardness of the Graph Bandwidth Problem , Uriel Feige, Lecture Notes in Computer Science ... linear graph layouts of low bandwidth is the Cuthill McKee algorithm . Applications The interest ... solutions for the graph bandwidth problem. Another application domain is in electronic design ..., and their placement EDA placement is arranged in a number of rows. In this context, graph bandwidth ... node53.html Minimum bandwidth problem , in Pierluigi Crescenzi and Viggo Kann eds. , A compendium ... more details
Modal Bandwidth , in the discipline of telecommunications , refers to the signalling rate per distance unit. The signalling rate can typically be measured in MHz , and the modal bandwidth is expressed as MHz km multiplied . The Modal bandwidth of a multimode fiber is determined from the optical output power frequency spectrum. The frequency at which the amplitude drops three decibels dB relative to the zero frequency component of the fiber is defined as the 3 dB bandwidth or modal bandwidth of the fiber. Telecomm stub DEFAULTSORT Modal Bandwidth Category Telecommunications ... more details
. Server computing Servers tend to use upstream bandwidth heavily, and violate most service agreements ...Original research date June 2011 A bandwidth cap , also known as a bit cap , limits the transfer of a specified amount of data over a period of time. Internet service provider s commonly apply a cap when a channel intended to be shared by many users becomes overloaded, or may be overloaded, by a few users. Implementation of a Bandwidthcomputingbandwidth cap is sometimes termed a Fair Access Policy or Usage based billing . Standard cap In many situations, each user of a network is expected to use high speed transmission for only a short time, for example to download a megabyte web page in less than a second. When use is continuous, as it might be in the case of file sharing , Internet radio or streaming video , a few users who use the connection at high rates for hours at a time may seriously impair the service of others. The concept is more relevant in cable internet where both the core network and the access network are shared, than in Asymmetric Digital Subscriber Line DSL where the core ... network bandwidth is relatively narrow. One type of bandwidth cap, administered by an Internet service .... The purpose of bandwidth capping is to prevent individual users from consuming the entire transmission ... charged that it is a method to charge consumers more by introducing tiered bandwidth caps. ref http ... management ref Sophistication is possible, and even required in limiting bandwidth. The simplest approach ... consume the maximum bandwidth continuously, theoretically imposing an excess burden on the ISP and possibly ... to the reported phenomenon of an ISP reducing an individual user s bandwidth cap, without notifying ... against an unpublished limit. If a user gets tagged as an offender, then the ISP imposes a lower bandwidth ... Internet Service Providers in North America and Europe introduced bandwidth caps in the early 2000 ... for excess data usage. See also Bandwidth hogging Bandwidth management Bandwidth throttling ... more details
Unreferenced date December 2009 Orphan date December 2009 In signal processing , the essential bandwidth is the portion of a signal spectrum in the frequency domain which contains most of the energy of the signal. DEFAULTSORT Essential Bandwidth Category Signal processing telecomm stub ... more details
Unreferenced date May 2009 Coherence bandwidth is a statistical measurement of the range of frequencies over which the channel can be considered flat , or in other words the approximate maximum bandwidth or frequency interval over which two frequencies of a signal are likely to experience comparable or correlated amplitude fading . If the multipath time delay spread equals D second s, then the coherence bandwidth math W c math in rad s is given approximately by the equation math W c approx 2 pi over D math The coherence bandwidth varies over Cellular network cellular or Personal Communications Service PCS communications paths because the multipath spread D varies from path to path. Application Frequencies within a coherence bandwidth of one another tend to all fade in a similar or correlated fashion. One reason for designing the CDMA IS 95 waveform with a bandwidth of approximately 1.25 Megahertz MHz is because in many urban signaling environments the coherence bandwidth W sub c sub is significantly less than 1.25 MHz. Therefore, when fading occurs it occurs only over a relatively small fraction of the total CDMA signal bandwidth. The portion of the signal bandwidth over which fading does not occur typically contains enough signal power to sustain reliable communications.This is the bandwidth over which the channel transfer function remains virtually constant. Example If the delay spread D over a particular cellular communication path in an urban environment is .19 s, then using equation above, the coherence bandwidth is approximately 5.3 megahertz MHz , of which the IS 95 bandwidth is only approximately 23 . See also Coherence time Coherence length Category Wave mechanics Category Radio frequency propagation ... more details
Bandwidth expansion is a technique for widening the Bandwidth signal processing bandwidth or the resonances in an Linear predictive coding LPC filter. This is done by moving all the Pole complex analysis poles towards the origin by a constant factor math gamma math . The bandwidth expanded filter math A z math can be easily derived from the original Digital filter filter math A z math by math A z A z gamma math Let math A z math be expressed as math A z sum k 0 N a kz k math The bandwidth expanded filter can be expressed as math A z sum k 0 N a k gamma kz k math In other words, each Linear prediction coefficient math a k math in the original filter is simply multiplied by math gamma k math in the bandwidth expanded filter. The simplicity of this transformation makes it attractive, especially in CELP coding of speech, where it is often used for the perceptual noise Weighting filter weighting and or to stabilize the LPC analysis. However, when it comes to stabilizing the LPC analysis, lag windowing is often preferred to bandwidth expansion. References P. Kabal, Ill Conditioning and Bandwidth Expansion in Linear Prediction of Speech , Proc. IEEE Int. Conf. Acoustics, Speech, Signal Processing , pp. I 824 I 827, 2003. Category Signal processing ... more details
Use mdy dates date March 2012 Refimprove date December 2009 Bandwidth allocation refers to how Radio frequency radio frequencies are assigned to different applications. The radio spectrum is a finite resource creating the need for an effective allocation process. In the United States, the Federal Communications Commission or Federal Communications Commission FCC has the responsibility allocating the portions of the spectrum, or bands, to various industries. For example, the FCC shifted the location of television on the spectrum, to open up more space for mobile applications. ref http www.businessweek.com magazine content 07 53 b4065000572464.htm?chan ma Just Ahead A Wider Wireless World , Wildstrom, S. ,BusinessWeek,December 19, 2007,Retrieved February 9, 2011 ref Different bands of spectrum ... 700 MHz Explained in 10 Steps publisher GIGA.com ref Bandwidth limitations Data crunch The radio frequency ... worldwide. However, the argument about a looming bandwidth crunch is refutable according to some ..., channel bonding and encouraging the development of bandwidth sensitive applications and devices ... the Capacity Crunch.pdf publisher Onyeije Consulting LLC accessdate April 30, 2011 ref Bandwidth allocation can also be used in reference to the computing industry, in scenarios such as allocating Bandwidthcomputingbandwidth to a web site running on a server computing server , or allocating bandwidth to a computer on a Computer networking network . Allocations in computing are often administered enforced by terminating or temporarily suspending access once the allocated bandwidth has been utilized .... Control of bandwidth allocation abroad The Federal Communications Commission FCC is an independent ... infrastructure and allocating bandwidth is, and how easy it is to switch off the access ... bandwidth, specifically Federal usage. Additionally, an Executive Memorandum, issued directly ... Bandwidth Allocation Category Electronics terms ... more details
The power bandwidth of an amplifier is sometimes taken as the frequency range or, rarely, the upper frequency limit for which the rated power output ref Audio Power Amplifier Design Handbook by Douglas Self page 22 ref of an amplifier can be maintained without excessive distortion to at least half of the full rated power. ref http www.answers.com topic power bandwidth ref ref The sound reinforcement handbook By Gary Davis, Ralph Jones page 197 ref Some specifications may mandate 100 of the rated power sometimes referring to the full power bandwidth . It should not be confused with half power bandwidth only used in conjunction with filter frequency response curves. Operational amplifiers often use the term full power bandwidth to refer to the frequency limit for the peak output voltage rather than power remaining up to the limit given for Direct current DC output voltage capability. Specifying power bandwidth Power bandwidth may be specified as a frequency range or as a graph. ref http www.nxp.com documents data sheet TDA1013B.pdf TDA1013B power amplifier IC specifications ref References reflist Category Sound Category Waves Physics stub ... more details
Cleanup laundry date March 2009 Bandwidth management is the process of measuring and controlling the communications traffic, packets on a network link, to avoid filling the link to capacity or overfilling the link, which would result in network congestion and poor performance of the network. Bandwidth management mechanisms and techniques Bandwidth management mechanisms may be used to further engineer performance and includes Traffic shaping rate limiting Token bucket Leaky bucket TCP rate control artificially adjusting TCP window size as well as controlling the rate of ACKs being returned to the sender Citation needed date July 2008 Scheduling algorithms Weighted fair queuing WFQ Class based weighted fair queuing Weighted round robin WRR Deficit weighted round robin DWRR Hierarchical Fair Service Curve HFSC Congestion avoidance Network congestion avoidance RED , network congestion avoidance ... Buffer tuning Bandwidth reservation protocols algorithms Resource reservation protocol RSVP Constraint ... reaches capacity results in waste of bandwidth Burstiness of web traffic requires spare bandwidth ... bandwidth fairly Tools and techniques Packet sniffer Network traffic measurement See also INASP runs bandwidth management training workshops and produces reports Bandwidth management using NetFlow ... on routers Traffic shaping and Rate limiting are bandwidth management traffic control techniques Bandwidth management is a subset of Network management and Performance management Network traffic measurement is a subset of Network monitoring Bandwidth throttling Bandwidth cap Notes Reflist ... pdf DEC0202.pdf Bandwidth Management Tools, Strategies, and Issues http www.techsoupforlibraries.org cookbook 3 networking and security bandwidth management TechSoup for Libraries Bandwidth Management http netequalizernews.com 2009 07 16 the true price of bandwidth monitoring The True Price of Bandwidth Monitoring DEFAULTSORT Bandwidth Management Category Network performance Internet stub fa ... more details
Commercial bandwidth is a term for the regular capacity of the telephone network required for intelligible speech. It was defined as 300 hertz to 3,400 hertz, although the modern PSTN is theoretically capable of transmitting from 0 Hz to 7,000 Hz using ISDN ref http tools.ietf.org html draft ietf isdnmib snmp isdn mib 01 multi user ISDN ref . References reflist See also DS0 Bandwidth signal processing voiceband telecomm stub Category Telephony ... more details
orphan date October 2011 Merge to Servo control date October 2011 Servo bandwidth can be defined as the maximum trackable sinusoidal frequency of amplitude A, with tracking achieved at or before 10 of A amplitude is reached. The servo bandwidth indicates the capability of the Servomechanism servo to follow rapid changes in the commanded input. ref cite book title Industrial Servo Control Systems Fundamentals and Applications author YOUNKIN page 42 year 2002 publisher CRC Press isbn 978 0 8247 4352 9 ref It is usually specified as a frequency in Hertz or radian sec. ref cite book title Power electronics handbook devices, circuits, and applications author M. H. Rashid page 902 publisher Academic Press year 2006 isbn 978 0 12 088479 7 ref Explanation Section OR date October 2011 Bandwidth of systems is generally defined to be the frequency at which the system s amplitude is 1 square root 2 times the signal amplitude. But if we apply same logic to servo systems it is difficult to analyze and develop a system to a sufficiently accurate specification. This is because of ambiguity with regard to frequency at which the amplitude should go to 1 root 2 . A simple and sound definition can be sought regarding this. Let us say we want to design a position servo control system with following specifications Bandwidth 10Hz Allowed amplitude range 50 The above definition is not enough to design a practical control system. The definitions above have inherent problems with regard to what amplitude the manufacturer should take to design the servo with 10Hz bandwidth. If the manufacturer takes the amplitude to be 20 and rise time for this amplitude to be 0.025 sec 10Hz sinusoid and some other manufacturer takes amplitude to be 50 , the acceleration requirements calculated by two will be very different. This leads us to understand that giving servo bandwidth alone with no amplitude specification is almost useless. Also defining the bandwidth as per normal bandwidth definition does not help ... more details
In broadcast television systems , VF bandwidth , video bandwidth signal processing bandwidth or more formally video frequency bandwidth is the range of frequencies between 0 and the highest frequency used to transmit a live television image. The maximum frequency can be found by multiplying three figures the number of frame video frames images per second, number of line video lines per frame and maximum number of sine periods per line. In the table below no. of frames per second, no. of lines per frame and the video band width in different systems are shown. ref Reference Data for Radio Engineers , Howard W.Sams Co., Inc, ISBN 0 672 21218 8, sec. 30, p. 33 ref class sortable wikitable Name of the systems No of frames per second No of lines per frame Video bandwidth , MHz. A 25 405 3 B C G H 25 625 5 D K L 25 625 6 E 25 819 10 M J 30 525 4.2 N 25 625 4.2 References Reflist Video formats Analogue TV transmitter topics Category Television technology Category Video formats Category History of television ... more details
Bandwidth extension of Signal electrical engineering signal is defined as the deliberate process of expanding the frequency range Bandwidth signal processing bandwidth of a signal in which it contains an appreciable and useful content, and or the frequency range in which its effects are such. Its significant advancement in recent years has led to the technology being adopted commercially in several areas including Psychoacoustics psychacoustic bass enhancement of small loudspeaker s and the high frequency enhancement of coded speech and audio. Bandwidth extension has been used in both speech and audio compression applications. The algorithms used in G.729.1 and Spectral Band Replication SBR are two of many examples of bandwidth extension algorithms currently in use. In these methods, the low band of the spectrum is encoded using an existing codec, whereas the high band is coarsely parameterized using fewer parameters. Many of these bandwidth extension algorithms make use of the correlation between the low band and the high band in order to predict the wider band signal from extracted .... Bandwidth Extension of Speech in telephone systems Telephone speech signals are usually very degraded in quality. Part of this degradation is due to the limited bandwidth used in the telephone systems. In most systems frequencies lower than 250 Hz are cut and bandwidth only extends to frequencies ... bandwidth, we can isolate the top octave using high pass filtering and then generating harmonics ... using a noise source. The sparse information available in the small bandwidth will probably be too limited to extract a proper envelope. Bandwidth Extension of Audio Spectral band replication SBR ... to low and high frequency bandwidth extension, Convention Paper 5921 Presented at the Audio Engineering ... , 2007 V. Berisha and A. Spanias A Scalable Bandwidth Extension Algorithm Proceedings of IEEE ... in bandwidth extension of telephony speech, in Proc. IEEE Int. Conf. Acoust., Speech Signal ... more details
See page 789 of Hennessy & Patterson cited below ... If the network is segmented into two equal parts, this is the bandwidth between the two parts. ref cite book author John L. Hennessy and David A. Patterson title Computer Architecture A Quantitative Approach edition Third Edition publisher Morgan Kaufmann Publishers, Inc date 2003 isbn 1558605967 ref Typically, this refers to the worst case segmentation, but being of equal parts is critical to the definition, as it refers to an actual bisection of the network. References references DEFAULTSORT Bisection Bandwidth Category Information theory Category Network management Compu network stub de Bisektionsbandbreite ... more details
Memory bandwidth is the rate at which data can be read from or stored into a semiconductor memory by a central processing unit processor . Memory bandwidth is usually expressed in units of bytes per second bytes second , though this can vary for systems with natural data sizes that are not a multiple of the commonly used 8 bit bytes. Memory bandwidth that is advertised for a given memory or system is usually the maximum theoretical bandwidth. In practice the observed memory bandwidth will be less than and is guaranteed not to exceed the advertised bandwidth. A variety of Computer benchmark computer benchmarks exist to measure sustained memory bandwidth using a variety of access patterns. These are intended to provide insight into the memory bandwidth that a system should sustain on various classes of real applications. Conventions Perhaps surprisingly, there are at least three different conventions for counting the quantity of data transferred in the numerator of bytes per second bytes second , as discussed in more detail in ref STREAM Benchmark FAQ Counting Bytes and FLOPS http www.cs.virginia.edu ... copy example, the STREAM bandwidth would be counted as 1 million bytes read plus 1 million bytes ... by the user code or not. Using the same 1 million byte copy example, the hardware bandwidth on computer ... of misleading comparisons of bandwidth based on different amounts of data traffic performed. Computation Theoretical maximum memory bandwidth is typically computed by multiplying the width of the interface ... i.e., the throughput may be less than the theoretical maximum memory bandwidth . The nomenclature ... MHz , would have a theoretical maximum memory bandwidth of 400 million hertz 2 interfaces 64 lines ... which reflects the theoretical maximum bandwidth in mebibytes per second. So with this in mind, the above ... than 64 bits is not counted in the bandwidth computations, as neither the extra memory nor the extra bandwidth is available for user data. See also List of device bandwidths A major factors in real ... more details
About the formal concept of computation computation the magazine Computing magazine the scientific journal Computing journal File Babbage Difference Engine Being utilised .jpg thumb 300px A difference engine computing the solution to a polynomial function File Moody Hall computer lab.jpg thumb 250px ... Wikimedia Foundation Wikimedia Server computing server s Computing is the activity of using computer hardware and computer software software . Definitions Computing Curricula 2005 ref name curricula The Joint Task Force for Computing Curricula 2005. http www.acm.org education curric vols CC2005 March06Final.pdf Computing Curricula 2005 The Overview Report pdf ref defined computing as blockquote In a general way, we can define computing to mean any goal oriented activity requiring, benefiting from, or creating computers. Thus, computing includes designing and building hardware and software ... The term computing has sometimes been narrowly defined, as in a 1989 Association for Computing Machinery ACM report on Computing as a Discipline ref http cs.gmu.edu cne pjd GP CompDisc.pdf Computing as a Discipline pdf ref blockquote The discipline of computing is the systematic study of algorithmic ..., and application. The fundamental question underlying all computing is What can be efficiently automated? blockquote Computing Curricula 2005 ref name curricula also recognizes that the meaning of computing depends on the context blockquote Computing also has other meanings that are more ... will view computing somewhat differently from a software engineer. Regardless of the context, doing computing well can be complicated and difficult. Because society needs people to do computing well, we must think of computing not only as a profession but also as a discipline. blockquote The term computing is also synonymous with counting and calculating. In earlier times, it was used in reference to mechanical computing machines. A computer is a machine that reads, stores, manipulates and displays ... more details
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