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From: Jerry Avins on 3 Apr 2010 22:15
On 4/3/2010 3:49 PM, Avier wrote:
> the thing i wanted to stay was that when doing multiplication in frequency
> (convolution in time ----- i said it wrong) the zero inserted upsampled
> signal can give good results(zeros inserted will not be there in frequency
> domain) ,,,,you are right that we will need a filter above fs/2

Filtering above fs/2 produces the interpolation you seem to believe is
unnecessary. The zeroes will be replaced with transition samples.

> if the zero insertion method is not worthy of use then why was it
> developed???? was it only the ease of implementation or something else
> ?????

This the method of choice when used properly.

Jerry
--
"It does me no injury for my neighbor to say there are 20 gods, or no
God. It neither picks my pocket nor breaks my leg."
Thomas Jefferson to the Virginia House of Delegates in 1776.
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From: Avier on 4 Apr 2010 02:51
i go it ....it was actually during a project that i came across
interpolation and there i had to use a lot filters actually pulse shaping
etc,,,, ...but the thing you mentioned was right that upsample + filtering
is actually the interpolatiion


there is a question : do we require upsampling or interpolation when
performing digital modualtion with our data before multiplying with carrier
?
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