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Last Update: 2009-01-01 |
இந்த விண்சாக் நடைமுறைப்படுத்தலில் முக்கியமான ஒரு செயல்பாடு நடைபெறவில்லை.
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Last Update: 2009-01-01 |
This function is not available in this special version of Opera.
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Opera -இன் இந்த சிறப்பு பதிப்பில் இந்த செயல்பாடு கிடைக்காது.
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Last Update: 2009-01-01 |
What is a signal? Of course, we know that a signal can be a rather abstract notion, such as a flashing light on our car's front bumper (turn signal), or an umpire's gesture indicating that a pitch went over the plate during a baseball game (a strike signal). One of the definitions of signal in the Merrian-Webster dictionary is:
"A detectable physical quantity or impulse (as a voltage, current, or magnetic field strength) by which messages or information can be transmitted." or
"A signal is a function of independant variables that carry some information."
"A signal is a physical quantity that varies with time,space or any other independent variable.by which information can be conveyed"
These are the types of signals which will be of interest in this book. We will focus on two broad classes of signals, discrete-time and continuous-time. We will consider discrete-time signals later. For now, we will focus our attention on continuous-time signals. Fortunately, continuous-time signals have a very convenient mathematical representation. We represent a continuous-time signal as a function x(t) of the real variable t. Here, t represents continuous time and we can assign to t any unit of time we deem appropriate (seconds, hours, years, etc.). We do not have to make any particular assumptions about x(t) such as "boundedness" (a signal is bounded if it has a finite value). Some of the signals we will work with are in fact, not bounded (i.e. they take on an infinite value). However most of the continuous-time signals we will deal with in the real world are bounded.
Signal: a function representing some variable that contains some information about the behavior of a natural or artificial system. Signals are one part of the whole. Signals are meaningless without systems to interpret them, and systems are useless without signals to process.
Signal: the energy (a traveling wave) that carries some information.
Signal example: an electrical circuit signal may represent a time-varying voltage measured across a resistor.
A signal can be represented as a function x(t) of an independent variable t which usually represents time. If t is a continuous variable, x(t) is a continuous-time signal, and if t is a discrete variable, defined only at discrete values of t, then x(t) is a discrete-time signal. A discrete-time signal is often identified as a sequence of numbers, denoted by x[n], where n is an integer.
Signal: the representation of information.
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Last Update: 2012-03-11 |
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