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Well, Yes I do understand the signal processing (am not an expert thought but I've already implemented the design in SIMULINK. it's a butterwort lowpass filter which can be used in a digital touch tone receiver. with th specs: Fc=852Hz, F2(stop-band freq = 2000Hz) Fs=8000Hz and S Attenuation>=15dB. I have already implemented it in SIMULINK using FDA too and generated HDL code as well. I have also implemented the DF-II block diagram in simulink after manually calculating the coefficients values and the difference equation. So, now I am trying to implement this block diagram for the filter in VHDL and I already know the values of coefficients and input can be anything. Now, I need to implement this using fixed-point arithematic. That's what I am trying to implement. Ofcourse I am looking for simulation at the moment but once I get the simulation right, I can implement it on FPGA. In short, if you meant, I need to do MATLAB implementation first, then as I've said earlier, I've done that.
Thanks, Kami