Hello,
I think you want to implement different signal processing algorithms like FIR, IIR and FFT algorithms and you are wondering whether to choose FPGA, ARM or a DSP processor and you want somebody to explain it to you and implement it for you.
If that is the case, I can help you with that. I am a professional embedded signal processing engineer with several years of experience. My price and timing here are only place holders and will depend on the actual amount of work.
Thanks.