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What a Question !
Every thing can be considered as a system .
Systems can contain subsystems and so systems arrangements can build a large system.
Signals are the ways of interaction between the systems .
All of these is modelling to characterize things in order to analyize the performance or to build new desirable arrangments
Your question is very generic
Do you need an introductory text in the subject?
signal is something which bears information and sytem is something which prouduces output for input or say produces signal corresponding to the input signal
signal means any information...and system process that information or modify the information to produce new information.we can use signal and system interchangeably by convolution theorem.
it is theorem which relates signal and system very clearly.
Signal: "time varying qunatite. which bearing some information"
System: " device which performs some specific (determine or predetermine)operation on signal
In the fields of communications, signal processing, and in electrical engineering more generally, a signal is any time-varying quantity. Signals are often scalar-valued functions of time (waveforms), but may be vector valued and may be functions of any other relevant independent variable.
Sound. Since a sound is a vibration of a medium (such as air), a sound signal associates a pressure value to every value of time and three space coordinates. A microphone converts sound pressure at some place to just a function of time, using a voltage signal as an analog of the sound signal.
Compact discs (CDs). CDs contain discrete signals representing sound, recorded at 44,100 samples per second. Each sample contains data for a left and right channel, which may be considered to be a 2-vector (since CDs are recorded in stereo).
Pictures. A picture assigns a color value to each of a set of points. Since the points lie on a plane, the domain is two-dimensional. If the picture is a physical object, such as a painting, it's a continuous signal. If the picture a digital image, it's a discrete signal. It's often convenient to represent color as the sum of the intensities of three primary colors, so that the signal is vector-valued with dimension three.
SYSTEM
1. A group of related components that interact to perform a task.
2. A "computer system" is made up of the CPU, operating system and peripheral devices. All desktop computers, laptop computers, network servers, minicomputers and mainframes are computer systems. Most references to "computer" imply the "computer system
3.An "information system" is a business application made up of the database, the data entry, update, query and report programs as well as manual and machine procedures. Order processing systems, payroll systems, inventory systems and accounts payable systems are examples of "information systems
It is the basic entity which takes signal/signals as input , does some processing (Operation) on it/them and may or may not give signal/signals as output may be in the same form or in the other form .
Signal :
It is the base input of any system , which contains some information for the system or for o/p signal it contains the information of the previous system.
So ,a system always needs one or more signals , but it is not necessary that a signal must always need aa system .
if u consider system as a black box which may be formed of any devices n circuits or a platform like software ---
the input and the output of the black box are definitely the information -- the signal
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it is in fact the sprit of an important field of telecomm engineering that studies the design of over all system in contrast with designing antennas or designing links etc.
the tools in signals and system are commonly transforms like Laplace and Fourier and z.
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