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From: "Peter O. Brackett"
Subject: Re: What filer has equal ripple phase response, and where can I find the pole positions for a 4th order filter?
Date: Mon, 20 Jan 2003 15:24:15 -0500
Organization: MindSpring Enterprises
X-Server-Date: 20 Jan 2003 20:24:00 GMT
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John et al:
> Even the first edition has data on filters with phase ripple of 0.05 and
> 0.5 degrees.
> Regards, John Woodgate, OOO - Own Opinions Only.
I believe the original poster posed the problem as...
>>I want to make a simple adjustable analog time delay to time-align
>>that use Linkwitz-Riley crossovers.
In order to create that time delay alignment I believe that he would need to
absolute group delays in the transmission paths.
This is difficult to do by prescribing phase responses.
Since phase is the the integral of delay, it is certainly possible, within
an integration constant,
to do this with a phase equalizer, but I have always found this to be more
and "comensurate" to approach as the design an absolute group delay
Of course the design of "absloute" group delay is alway more difficult than
the design of "relative"
group delay because of the total area constraint [The total area under the
group delay curve
is *almost* fixed and thus so is the order of the filter, resulting in
constraints on the group delay
Indialantic By-the-Sea, FL.
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