DTSP UNIT II - DISCRETE TIME SYSTEM ANALYSIS.pptx
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This document discusses discrete time system analysis and the Z-transform. It introduces the Z-transform as the discrete-time counterpart of the Laplace transform, which is used to represent and analyze linear time-invariant discrete-time systems. The Z-transform is used to convert difference equations in the time domain to algebraic equations in the Z-domain, which can then be more easily solved and converted back to the time domain using the inverse Z-transform. The document also notes that the Z-transform generalizes the discrete-time Fourier transform and is well-suited for solving difference equations with initial conditions.
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- 1. UNIT – II DISCRETE TIME SYSTEM ANALYSIS DISCRETE TIME SIGNAL PROCESSING 1
- 2. UNIT II DISCRETE TIME SYSTEM ANALYSIS Z-transform and its properties - Inverse Z-transforms - Difference equation - Analysis of linear time invarient system in Z domain - Stability analysis, frequency response - Linear and circular convolution. 2
- 3. Z-transform A linear time-invariant discrete-time system is represented by difference equations. The direct solution of higher order difference equations is quite tedious and time consuming. So usually they are solved by indirect methods. The Z-transform plays the same role for discrete-time systems as that played by Laplace transform for continuous-time systems. The Z-transform is the discrete-time counterpart of the Laplace transform. It is the Laplace transform of the discretized version of the continuous-time signal x(t). To solve the difference equations which are in time domain, they are converted first into algebraic equations in z-domain using Z- transform, the algebraic equations are manipulated in z-domain and the result obtained is converted back into time domain using inverse Z-transform. 3
- 4. The Z-transform has the advantage that it is a simple and systematic method and the complete solution can be obtained in one step and the initial conditions can be introduced in the beginning of the process itself. The Z-transform plays an important role in the analysis and representation of discrete- time Linear Shift Invariant (LSI) systems. It is the generalization of the Discrete-Time Fourier Transform (DTFT). The Z-transform may be one-sided (unilateral) or two-sided (bilateral). It is the one-sided or unilateral Z-transform that is more useful, because we mostly deal with causal sequences. Further, it is eminently suited for solving difference equations with initial conditions. 4
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- 19. Thank You 19