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Topic: Signal

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  Signal (electrical engineering) - Wikipedia, the free encyclopedia
Signals are often scalar-valued functions of time (waveforms), but may be vector valued and may be functions of any other relevant independent variable.
It is remarkably useful to analyze the frequency spectrum of a signal.
For instance, if a signal is passed through an LTI system, the frequency spectrum of the resulting output signal is the product of the frequency spectrum of the original input signal and the frequency response of the system.
en.wikipedia.org /wiki/Signal_(information_theory)   (973 words)

 Define signal - a definition from Whatis.com
The simplest form of signal is a direct current (DC) that is switched on and off; this is the principle by which the early telegraph worked.
Except for DC signals such as telegraph and baseband, all signal carriers have a definable frequency or frequencies.
Signals also have a property called wavelength, which is inversely proportional to the frequency.
searchnetworking.techtarget.com /sDefinition/0,,sid7_gci212986,00.html   (296 words)

 Signal Transduction
Signal transduction at the cellular level refers to the movement of signals from outside the cell to inside.
The movement of signals can be simple, like that associated with receptor molecules of the acetylcholine class: receptors that constitute channels which, upon ligand interaction, allow signals to be passed in the form of small ion movement, either into or out of the cell.
The signaling pathways utilized by the TGF-b, activin and BMP receptors are different than those for receptors with intrinsic tyrosine kinase activity or that associate with intracellular tyrosine kinases.
web.indstate.edu /thcme/mwking/signal-transduction.html   (3263 words)

 Signal Magazine 1940 - 1945
Signal was a unique product of Germany's high-powered propaganda machinery: a nearly folio-sized magazine created in an effort to rally other European nations under the Teutonic banner, and to promote and justify German hegemony over Europe.
In a War of Words, Signal was a most effective weapon which the German propaganda experts succeeded in putting to maximum use.
For even today the articles of Signal retain their uncanny attractiveness, which is a strong indicator for their dangerous propagandistic qualities.
uw3.de /signal.htm   (466 words)

 7.1 signal -- Set handlers for asynchronous events
A handler for a particular signal, once set, remains installed until it is explicitly reset (Python emulates the BSD style interface regardless of the underlying implementation), with the exception of the handler for
This means that signals arriving during long calculations implemented purely in C (such as regular expression matches on large bodies of text) may be delayed for an arbitrary amount of time.
When a signal arrives during an I/O operation, it is possible that the I/O operation raises an exception after the signal handler returns.
www.python.org /doc/current/lib/module-signal.html   (676 words)

Bring an end to the confused conventions of the file name and to the nightmares versioning with signal CS2®, the one in charge intuitive of the version of the file-version in creative® software of room 2 of marinates.
Substitutes of signal CS2 of the version of the use to handle variations of a design easily.
Invite reviewers who put under the commentaries that the signal of the version centrally gathers and the marks available for all the reviewers for the reference whereas the revision progresses.
cue.letgohome.com   (645 words)

 UP-Locomotive Horn Signals   (Site not responding. Last check: 2007-10-22)
Following are the required horn signals listed in the UPRR rule book, along with their meanings.
Signals are illustrated by an "o" for short sounds and "=" for longer sounds.
Signal is prolonged or repeated until the engine occupies the crossing.
www.uprr.com /aboutup/signals.shtml   (374 words)

 SIGNAL home
SIGNAL plays a major role in coordinating the implementation of the national nutrition strategy, ‘Eat Well Australia: a national framework for action in public health nutrition, 2000–2010’, which includes an action plan for Aboriginal and Torres Strait Islander peoples.
SIGNAL is taking a national approach to public health nutrition to ensure greater consistency and better coordination of government policy and strategy development across Australia.
SIGNAL has a leadership role in building a common approach to public health nutrition across the Commonwealth, State and Territory governments, as well as coordinating and supporting national programs.
www.nphp.gov.au /workprog/signal   (757 words)

 Signal - Wikipedia, the free encyclopedia
Signal processing, the field of techniques used to extract information from signals
Signal (computing), an event, message, or data structure transmitted between computational processes
Signalling theory in biology, how organisms signal their state to others
en.wikipedia.org /wiki/Signal   (184 words)

The signal() function chooses one of three ways in which receipt of the signal number sig is to be subsequently handled.
The sig argument is not a valid signal number or an attempt is made to catch a signal that cannot be caught or ignore a signal that cannot be ignored.
An attempt is made to catch a signal that cannot be caught, or to ignore a signal that cannot be ignored.
www.opengroup.org /onlinepubs/007908799/xsh/signal.html   (826 words)

 Revelations on Java signal handling and termination
Signals can be raised for many different reasons; for example, a SIGSEGV will be raised when a process attempts to access an address for which it does not have permission.
The JVM's use of signals is platform-dependent; for certain platforms the JVM may use signals for efficient byte code interpretation, or for suspending, resuming, and interrupting threads.
In this case the JVM signal handler assumes that the signal is for the JVM.
www-128.ibm.com /developerworks/ibm/library/i-signalhandling   (2976 words)

 Signal   (Site not responding. Last check: 2007-10-22)
For over 40 years, Signal has been helping millions of people, like you, to taste life to the full by providing products that are clinically proven to protect and enhance their oral health 24 hours a day.
This has included introducing a new range, Signal Xperience, designed to meet the needs of the young, plus initiatives to promote higher standards of oral hygiene, usually in association with dentists and other oral healthcare experts.
Signal also plays a major role in promoting early brushing in many developing countries through its schools programme.
www.unilever.com /ourbrands/personalcare/Signal.asp   (312 words)

 New Scientist Breaking News - Mysterious signals from light years away   (Site not responding. Last check: 2007-10-22)
For instance, the signal’s frequency is drifting by between eight to 37 hertz per second.
“The signal is moving rapidly in frequency and you would expect that to happen if you are looking at a transmitter on a planet that’s rotating very rapidly and where the civilisation is not correcting the transmission for the motion of the planet,” Korpela says.
The signal could be an artefact that, for some reason, always appears to be coming from the same point in the sky.
www.newscientist.com /article.ns?id=dn6341   (1041 words)

 Glossary of signal terms   (Site not responding. Last check: 2007-10-22)
Cab signal: A signal located in the engineman’s cab or compartment indicating a condition affecting the movement of a train or engine and used in conjunction with interlocking signals and in conjunction with or instead of block signals.
Grade signal: A permissive signal used along a steep climb and identified by both a number plate and a plate with the letter “G.” The governing rule is usually that a full-tonnage train climbing the grade may pass a grade signal indicating stop without stopping.
Signal aspect: The appearance of a fixed signal conveying an indication as viewed from the direction of an approaching train, or the appearance of a cab signal conveying an indication as viewed by an observer in the cab.
www.trains.com /content/dynamic/articles/000/000/003/674svyza.asp   (860 words)

 Baldwin City Signal: The Signal Oak
Still, a lantern from the branches of the Signal Oak near Kibbee Cabin telegraphed a code of signs across the Coal Creek Valley to Blue Mound, where they were flashed in turn to Mount Oread at Lawrence and back again.
The site of Signal Oak, which is marked by a sign and a monument thanks to the work of dedicated local historians, is at the top of Simmons' Hill just north of Baldwin City.
The farm adjacent to the Signal Oak site on the north is the former Bishop William Quayle's farm that he laughingly called 'my farm that stands on end.' The woods to the north and northwest of this farm are known as the Bridenthal and Rice Natural History Preserves.
signal.baldwincity.com /section/baldwin_history/first   (1171 words)

 Welcome to the IEEE Signal Processing Society Homepage
The Signal Processing Society's Field of Interest shall be the theory and application of filtering, coding, transmitting, estimating, detecting, analyzing, recognizing, synthesizing, recording, and reproducing signals by digital or analog devices or techniques.
The Signal Processing Society is an international organization whose purpose is to: advance and disseminate state-of-the-art scientific information and resources; educate the signal processing community; and provide a venue for people to interact and exchange ideas.
We do this by: being a one-stop source of signal processing resources; providing a variety of high quality resources to a variety of users in formats customized to their interests; adapting to a rapidly changing technical community; and being intimately involved in the education of signal processing professionals at all levels.
www.ieee.org /organizations/society/sp   (193 words)

 Module: Signal
Some signals have a defined effect on the process, while others may be trapped at the code level and acted upon.
For example, your process may trap the USR1 signal and use it to toggle debugging, and may use TERM to initiate a controlled shutdown.
Signal delivery semantics may also vary between systems; in particular signal delivery may not always be reliable.
www.ruby-doc.org /core/classes/Signal.html   (313 words)

 CLHS: Function SIGNAL
Signals the condition denoted by the given datum and arguments.
The continue restart can be used to continue with the signaling process.
This is also true for all other functions and macros that should, might, or must signal conditions.
www.lispworks.com /documentation/HyperSpec/Body/f_signal.htm   (95 words)

 Signal - Arizona Ghost Town
Signal's post office was established October 15, 1877 and discontinued may 14, 1932.
Three years after the discovery of the McCracken mine in 1884, Signal came to be based from its own mine, and the mills for itself and McCracken.
The major problem for Signal was getting freight to the isolated location.
www.ghosttowns.com /states/az/signal.html   (169 words)

 Oilfield Glossary: Term 'X-signal'
The reactive (X) signal, or that part of the alternating signal at the receiver of an induction logging tool that is out of phase with the transmitter current.
This signal, also known as the quadrature signal, is less sensitive to formation conductivity and must be separated from the R-signal, which is the main or, in older tools, the only source of the induction log.
This direct signal is largely eliminated by use of a bucking coil.
www.glossary.oilfield.slb.com /Display.cfm?Term=X-signal   (123 words)

 Vitesse - Technologies - Signal Integrity
Removing these types of jitter requires that the signal be re-sampled using a recovered clock, and this makes the case for an architecture that includes clock and data recovery.
In cases where the signal degradation is dominated by random effects, a solution with clock and data recovery is indicated.
Signal Integrity is a major issue for system designers developing new communication systems or upgrading bandwidth capacity for systems that are already deployed.
www.vitesse.com /technologies/index.php?id=12   (750 words)

 libc.a reference
Signals are generated in response to some exceptional behavior of the program, such as division by 0.
The default handling for the rest of the signals is to print a traceback (a stack dump which describes the sequence of function calls leading to the generation of the signal) and abort the program by calling
Signal handlers that you write are regular C functions, and may call any function that the ANSI/POSIX specs say are valid for signal handlers.
www.delorie.com /djgpp/doc/libc/libc_724.html   (912 words)

 ASPN : Python Cookbook : Global Signal Dispatching   (Site not responding. Last check: 2007-10-22)
If signal is Any, receiver will receive any signal from sender.
If signal is Any and sender is None, receiver will receive any signal from anonymous.
If signal is Any and sender is Any, receiver will receive any signal from any sender.
aspn.activestate.com /ASPN/Cookbook/Python/Recipe/87056   (722 words)

 [No title]
The Signal was formed in 1984 to address the needs of an infant wireless communications marketplace.
Signal Holdings offers a customizable, turnkey solution to address all of the requirements of a wireless service provider’s handset insurance needs, and also offers extended service contracts, logistic and repair services, supply chain gating, roadside assistance, and many other value enhancing products and services through its other member companies.
The Signal is a member company of Signal Holdings, a corporation uniquely positioned to provide insurance, extended Service Contracts, fulfillment, logistics services, brokerage and underwriting services to the wireless community through all of its member companies, including The Signal, CWork Solutions, TelecomRe and Service Contract Solutions.
www.thesignal.com   (251 words)

 Signal Lake   (Site not responding. Last check: 2007-10-22)
Signal Lake works with these early stage telecom and network infrastructure companies to attract complementary skills to insure commercial success, to develop high margin products to address large growing markets, to develop business plans with significant milestones, and to build investor syndicates to fund to positive cash flow.
Signal Lake has a primary geographic focus on the US Northeast but globally opportunistic.
Consulting: The Signal Lake team has extensive experience consulting with third parties on information technology and networking issues.We believe that consulting engagements expose Signal Lake to a variety of cutting-edge issues, and provide our portfolio companies with heightened opportunities for developing mutually beneficial relationships with major industry players.
www.signallake.com   (231 words)

 Zonker's Passive Signal Tracer Page
Because a passive signal tracer does not emit a signal, it is NOT a cable tracer, or a cable analyzer.
A passive signal tracer is meant for momentary troubleshooting, and is not left in-line.
The main reliance is that the signal ground is on pin 4 of the RJ-45, and a switch is used to connect ground to pin 5 for use with Cisco devices.
www.conserver.com /consoles/Tracers/tracers.html   (3627 words)

Four years at Signal - not a bore...ealis
If I could offer you only one tip for the future, The Signal would be it.
The long-term benefits of The Signal have been proven by 121 years of basement dwellers, whereas the rest of my advice has no basis more reliable than my own meanderings as News Assistant, News Editor, Managing Editor and Editor in Chief.
www.signal-online.net   (863 words)

 WAC | Gallery9 | WebWalker Daily | dietz | art entertainment network |
This equals one bit of information, regardless whether it is conveyed via a pre-arranged signal such as one finger for a boy, two for a girl, or if the nurse were to come out and say to the father, "Congratulations.
It may be that in Shannon's model all the interpretive stuff is a kind of noise, confusing the signal, and what is critical is the elegance, speed, and accuracy of the algorithm used to encode and de-encode the information source and transmit its signal.
And while it may or may not prove true in the end that the museum is a good transmitter of artistic practice, certainly, as a transmitter of its own signal, it is important that the museum optimize for the network, if that is a channel it is interested in.
www.walkerart.org /archive/A/B47385195FB875116161.htm   (4945 words)

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