System X(n) y(n) the behavior or response of a linear system to a given input signal One method is...
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Transcript of System X(n) y(n) the behavior or response of a linear system to a given input signal One method is...
ANALYSIS OF DISCRETE LINEAR TIME INVARIANT SYSTEMS
systemX(n) y(n)
the behavior or response of a linear system to a given input signal
One method is based on the direct solution of the input-output equation for the system.
the second method is to decompose the input signal into a sum of elementary signals. Then, using the linearity property of the system, the responses of the system to the elementary signals are added to obtain the total response of the system.
Convolution method
The impulse response:
Finite impulse response
infinite impulse response
system
FIR system
IIR system
The linear time invariant systems are characterized in the time domain by their response to a unit sample sequencean LTI system is causal if and only if its impulse response is zero for negative values of n.
Imp resp is noncausal and stable
Imp resp is causal and unstable
h(n) h(n)
Impulse response is non causal and stable
h(n)
h(n)
Various forms of impulse response
Impulse response is causal and stable
h(n)
Impulse response is causal and unstable
Example :Find the impulse response of the system described by the following difference equation y(n)=1.5 y(n-1)-0.85 y(n-2) +x(n), is this system is FIR or IIR
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