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Basic Signals & systems question...

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SKS

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1>A negative frequecy in continuous time domain can b interpreted as the phasor rotating in the clockwise direction....BUT what do we mean by a negaive frequency in discrete time domain??

2>we generally consider the discrete time frequencies in the range 0 to 2Π to be unique and all other frequencies to be the alias of these....BUT when we draw the frequency Π/2 rad/sample and 3Π/2 rad/sample, they give the same figure...so in what way they r regarded as different frequencies?? this is just 1 example!!
 

If the phasor in continuous time rotates with continuous change in angle, the phasor in discrete time rotates with discrete jumps in angle.

If the signal is real, then 0 to Pi defines the whole signal and Pi to 2*Pi is a reflection of Pi to 0.
 

    SKS

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