help about evaluate the system source i need

It is not easy to answer your question on "how many source I need" as there are many variables involved.

1. Shall we assume you will be running a NIOS II processor to do the FFT?

2. The FIR will (maybe) be in hardware?

3. Pulse Width Modulator.

4. A/D input reader.

All of the above will use various resources from the internals of the FPGA in different amounts depending on several factors.

Code space will be a function of the FFT size.

Logic size will be a function of the size of the FIR as well.

The PWM is quite small.

The A/D input is small as well.

If I had to guess at this, I would look at one of the Altera DSP Kits, either Cyclone II or Stratix II 60 based.

There may be other boards out there as well that have the A/D's you need, as well as some external memory in case your code gets to big.

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