Explain to me this statement about discrete time sinusoids

[abbas1707]

hi,
can any one explain this for me
" sequence of any two Discrete time sinusoids with frequencies in the range (-pi ≤w≤pi) are not equal"

y -pi to pi???

can anyone explain or prove>>??
thanx

 

[vahidkh6222]

confused

i think it is about priodic nature of frequency domain representation of Discrete time sequences.

they are all periodic with period of 2pi in freq domain. (pi represents nyquist frequency;i.e. maximum available(meaningfull) frequency that a Discrete time signal can carry information about.)

 

[naresh850]

confused

Hi vahidkh

if u have any book/material then kindly plz share

 

[vahidkh6222]

confused

it is widely available in net(i think you can even find it in EDAboard if you search):
Discrete time signal processing by Allan V.oppenheim. you can find your answer in it's few 1st chapters. It's the best reference...