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20517545
Signals and Systems
Description
Mind Map on Signals and Systems, created by Sreenivasulu Meda on 03/01/2020.
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introduction to signals & systems
signals and systems
engineering
Mind Map by
Sreenivasulu Meda
, updated more than 1 year ago
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Created by
ramya.raj7787
almost 11 years ago
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Sreenivasulu Meda
over 4 years ago
Copied by
Sreenivasulu Meda
over 4 years ago
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Resource summary
Signals and Systems
Signal: A fn which contains some information or the physical variation of one quantity w.r.t. other
Continuous Time and Discrete Time
CT : x (t)
DT: x [n]
CT -> Sampling -> DT
Conjugate Symmetric and Conjugate Skew Symmetric
CS: x(t) = x*(-t); x [n] = x* [-n]
CSS: x(t) = -x* (-t); x [n] = -x* [-n]
Period and Non-periodic
P: x (t) --> x(t+T) = x(t); for all t & T element of R-{0}; x [n] --> x[n+N] = x[n]; for all n; N element of Z-{0}
Energy and Power Signals
Energy Signal : 0 < E < infinity; P --> 0
Power Signal: 0 < P < infinity; E --> infinity
Real and Complex
Real : If the signal contains only real value
Else Complex Signal
System: An entity which extracts useful information from the signal or it processes the signal
Linear System
Obeys Superposition Principle
Time Invariant System
delayed version of i/p gives delayed version of o/p
Causal System
O/p depends on present and past i/p s
Stable System (BIBO)
Bounded i/p should give bounded o/p
Invertible System
x(t) must be able to be obtained from y(t)
Memoryless
O/p depend only on the present i/p
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