DSP using FRIENDLY ARM

Sir,
 I wanted to know whether can we do digital signal processing such as
filtering the signals, using ARM9?

The S3C2440 ARM9 does not have DSP hardware but you can most definitely
perform DSP in software routines. So yes, you can.

You will find many articles on the net on how to perform DSP insoftware.
Even wikipedia has some pseudo code for filter implementations in software.
Have a look at this continuous low pass filter:

http://en.wikipedia.org/wiki/Low-pass_filter

for i from 1 to n
       y[i] := y[i-1] + α * (x[i] - y[i-1])

Good luck

MC

I will go through the given link.

Thank you.