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A Signal is detectable physical quantity or impulse (as a voltage, current, or magnetic field strength) by which messages or information can be transmitted. It is a function of independent variables that carry some information. 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.
A System is any physical set of components that takes a signal, and produces a signal. In terms of engineering, the input is generally some electrical signal X, and the output is another electrical signal (response) Y. However, this may not always be the case. Consider a household thermostat, which takes input in the form of a knob or a switch, and in turn outputs electrical control signals for the furnace. A main purpose of this book is to try and lay some of the theoretical foundation for future dealings with electrical signals. Systems will be discussed in a theoretical sense only.
National symposium and workshops provide participants with an advanced or updated review of the most novel, clinically developments in research, treatment and management of critically ill or unstable condition patients. The conference is unfastening to all doctors, clinicians, researchers, health policy makers, physicians, nurses and health professionals. Around 15 National symposiums and Workshops are going to be held across the globe which includes “5th International Conference on Optical Communication Systems”, “2015 2nd International Conference on Signal Processing and Integrated Networks”, “2014 12th International Conference on Signal Processing” and many more.
The International Association of Science and Technology for Development (IASTED) is a non-profit organization devoted to promoting social, economic, and technical advancements around the world. Established in 1977, IASTED organizes multidisciplinary conferences for academics and professionals in the fields of science, engineering, medicine, management, and education.
• 4th International Conference on Wireless Mobile Communication and Healthcare
• MedCom 2014 International Conference on Medical Imaging, mHealth and Emerging Communication Systems Greater
• The 8th International Wireless Internet Conference - Symposium on Wireless and Vehicular Communication
• 2014 2nd International Workshop on Information and Electronics Engineering (IWIEE 2014)
• International Conference on Digital Signal Processing (ICDSP 2014)
• 6th International Conference on Signal Processing Systems (ICSPS 2014)
• 2014 2nd International Conference on Signal Processing, Microsystems and Sensors
• International Conference on Applications of Fractals and Wavelets
• 8th International Conference on Bio-inspired Systems and Signal Processing (BIOSIGNALS 2015)
• Keystone Symposia: PI 3-Kinase Signaling Pathways in Disease
Relevant Society and Associations:-
• The National Council for Scientific and Technological Development (CNPq) - Brazil
• São Paulo Research Foundation (FAPESP)
• Science and Engineering Institute
• Federal Signal Corporation
• Maxim Integrated
• Edwards Signaling
• Medical Device and Diagnostic Industry
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This page was last updated on 03rd Sep, 2014