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HELP ME IN SAMPLING

Started by n_no...@yahoo.com October 9, 2007
hi,
i need help in sampling(matlab coding) a four channel AM modulated signal each at carrier frequencies 400Hz,1000Hz, 1600Hz and 2600Hz respectively...

how will i sample my signal in such a way that 400Hz signal spectrum gets repeated at zero carrier frequency, so that i can apply a LOW PASS FILTER to extract my very first channel...

kindly help me out...

regards
Nosheen