From: Charles Henry ()
Date: May 8, 2008
Subject:
Re: FAQ is BAQ! - frequency shifting.
On Thu, May 8, 2008 at 12:10 PM, robert bristow-johnson
wrote:
> there is a technical value judgement here ("best, simple[st], [most] efficient, clean[est]") that might not be universally held. another method that is current (even more current because in Weaver's day, they didn't have real-time Hilbert transformers) involves a single "filter" (the Hilbert transformer, i won't count the corresponding delay line as another filter) and two sine/cosine multiply operations. a quick Google search finds this link to illustrate:
>
> http://www56.homepage.villanova.edu/scott.sawyer/fpga/II_frequency_shifting.htm
[EMAIL REMOVED]
Quick question, here. I have sometimes struggled to create a good RT
Hilbert transform (I made a couple of pd patches that while appearing
to be correct on the surface with relevant math behind it, but
produces horrible phase shifts). How does one make an RT Hilbert
transform?
(I can also provide details on my method, if desired.)
Chuck
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