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About four years ago I implemented a Hilber transform in a spartan 3 FPGA.
From memory the Hilbert transform was structurally the same as an FIR filter where the filter coefficients corresponded to that required to implement a Hilbert Transform.
Basically I believe each of the Hilbert transform coefficients were stored at an address in RAM. This was a long time ago but I beleive I took the input passed it into a first in first out array. At each clock I simply multipled each address in Ram by the corresponding delayed input in the FIFO array and added the result, then shifted the FIFO array.
Hope this helps
Added after 3 minutes:
Actually its funny, I remember going to an interview for a job with an example of this Hilbert Transform I had written in VHDL.
I left the interview without a job and without the code. I believe the interviewer had actually stollen my work.
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