05-04-2012, 04:29 PM
Digital Signal Processing
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TRANSFORMATION
•torepresentthesignalfromonedomaintootherietimetofrequencydomainortimetoZ-domainorLaplacedomainetc.
•transformationisgenerallydonetoextractmoreinformationfromthesignal.
Examples of Linear Systems
Wave Propagation ( sound & electromagnetic waves)
Electrical Circuits ( RLC)
Electronic Circuits ( Amplifiers & filters)
Mechanical Motion( due to interaction of masses, springs & dampeners)
Systems described by differential equations( RLC networks)
Multiplication by a constant
Signal Changes( echoes, resonances, image blurring)
Unity System( O/P = I/P)
Causality
In a causal system-output at time ‘t’ can depend only on the input at time t and prior. Non-causal or anticipatory system –output at time ‘t’ can depend upon future values of input ie anticipatory values.