Path: utzoo!attcan!uunet!maverick.ksu.ksu.edu!uafhp!uafhcx!cdc
From: cdc@uafhcx.uucp (C. D. Covington)
Newsgroups: comp.dsp
Subject: Re: Hilbert Transformer
Summary: Hilbert Analog and Digital
Message-ID: <4834@uafhp.uark.edu>
Date: 27 Jun 90 14:43:47 GMT
References: <267ADD3E.18081@maccs.dcss.mcmaster.ca>
Sender: netnews@uafhp.uark.edu
Organization: College of Engineering, University of Arkansas, Fayetteville
Lines: 20


In article <267ADD3E.18081@maccs.dcss.mcmaster.ca>, darel@maccs.dcss.mcmaster.ca (Darel Mesher) writes:
> 
>   I was wondering if anyone has a reference to an analog implementation
> of a Hilbert transformer (ie. 90 degree phase shift). I also need
> a digital implementation but that should be fairly easy to find 
> (Oppenheimer/Schafer).

     I would say the analog version would be difficult to come by.  The digital
version benefits from the fact that the signal is lowpass by definition (Nyquist
and all that).  If memory serves me, the digital version is simply:

                1/n    n odd
      h(n) =
                 0     n even

     Or even simpler in the frequency domain.

C. David Covington (WA5TGF)  cdc@uafhcx.uark.edu     (501) 575-6583
Asst Prof, Elec Eng          Univ of Arkansas        Fayetteville, AR 72701