Newsgroups: comp.dsp
Path: utzoo!utgpu!cunews!wilf
From: wilf@sce.carleton.ca (Wilf Leblanc)
Subject: Re: 180 deg phase shift
Message-ID: <wilf.673714405@rigel.sce.carleton.ca>
Sender: news@ccs.carleton.ca (news)
Organization: Carleton University, Ottawa, Canada
References: <1644@fs1.ee.ubc.ca> <1991May7.152409.3933@njitgw.njit.edu> <1991May8.022953.781@appmag.com>
Date:  8 May 91 14:53:25 GMT

todd@appmag.com (Todd Day) writes:

>%Well, sure, you all can say how easy it is, but you're stopping shy of the
>%hard part. Can't implement a transfer function without getting it into the
>%form of a difference equation! That's the challenge...

Want a difference equation ??

y(n) = -x(n)

>[...]

>First of all, 180 deg phase shift is not the same as simply inverting
>the signal.  A phase shift implies a time delay of some sort.

Oh, it does does it ??

Does a transfer function H(z) = -1 imply a time delay ??

[...]

>-- 
>Todd Day  |  todd@appmag.com
--
Wilf LeBlanc, Carleton University, Systems & Comp. Eng. Ottawa, Canada, K1S 5B6
Internet: wilf@sce.carleton.ca   UUCP: ...!uunet!mitel!cunews!sce!wilf
                Oh, cruel fate! Why do you mock me so! (H. Simpson)
