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when is a function f[n] said to be left-sided?

when is a function f[n] said to be left-sided? Correct Answer f[n] = 0 for n &gt; n<sub>0</sub> , n<sub>0</sub> is positive integer

Concept:

Signals can be represented in three different possibilities.

1.Right-sided signal

2. Left-sided signal

3. Two-sided signal

= 0 for

n0 < 0

Left sided

f(t) = 0 for t0 > 0

f = 0 for

n0 > 0

Two sided

f(t) ≠ 0 ∀  t

f ≠ 0 ∀  n

 

From the above table we can conclude that for function to be left sided in discrete time domain the condition is:

 f = 0 for n > 0 or f = 0 for n > n0

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