ece306-4 - ECE 306 Discrete-Time Signals and Systems...

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1 °±° ²³´µ¶ · ECE 306 Discrete-Time Signals and Systems °± ²³´µ¶·´¸´¹º³» ¼ ³½¸¾¿ ´¸¶³ ¶ÀÁ¹ÃÄ»¾½¿¼Àº´À½½¿ ´Àº ŽĶ¿¾Ã½À¾ ¶³ ƹ³µ ƹùÀ¶ °±° ²³´ µ¶ °±° ²³´µ¶ ¸ Discrete-Time Signals ¹ A Discrete-time signal is a function of an independent integer variable n . The signal is not defined for non- integer values of n . We can represent a discrete-time signal different ways; 1. Graphical representation ( ) x n ( ) x n Such as
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2 °±° ²³´µ¶ ² Discrete-Time Signals 2. Functional representation ( ) 1, for 1,3 4, for 2 0, elsewhere x n n n = = ° ± = ² ± ³ 3. Tabular representation 0 0 0 1 4 1 0 0 … º» ¼½ … -2 -1 0 1 2 3 4 5 … ¼ 4. Sequential representation ( ) {...0,0,1,4,1,1,0,0,...} x n = The time origin (n=0) is indicated by the symbol . Such as Such as Such as °±° ²³´µ¶ ¶ Some Elementary Discrete-Time Signals 1. The unit sample sequence : The unit sample sequence is often referred to as a discrete-time impulse or an impulse.
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