Help with All-Pass Filter Design Method

On Thursday, May 2, 2013 6:16:54 AM UTC-7, westocl wrote:
> I would like to generate coefficents for an all pass that approximates a
> desired group delay response.  I was surfing the net for methods and came
> across a ieee article that uses the hilber transform method to design such
> a filter.
> 
> http://ieeexplore.ieee.org/xpl/login.jsp?tp=&arnumber=112149&url=http%3A%2F%2Fieeexplore.ieee.org%2Fxpls%2Fabs_all.jsp%3Farnumber%3D112149
> 
You might try including a more coherent form of citation with your IEEE reference such as:
 Digital all-pass filter design through discrete Hilbert transform
Circuits and Systems, 1990., IEEE International Symposium on
Date of Conference: 1-3 May 1990
Author(s): 
Reddy, G.R.
Swamy, M.N.S. 

Then people might know that the paper is from a Circuits and Systems Society conference paper and might require a Circuits and Systems Society membership for access (for those without some sort of library privileges).

Also a simple search on the title and authors gives some available papers that discuss the methods in the cited paper and offer alternatives:
A DIGITAL ALL-PASS FILTER DESIGN BASED ON DISCRETE HILBERT
TRANSFORM
G. Jovanovic-Dolecek and J. D�az-Carmona
available at:
http://www.ux.uis.no/norsig/norsig2002/Proceedings/papers/cr1027.pdf

Proc. of the 9th Int. Conference on Digital Audio Effects (DAFx-06), Montreal, Canada, September 18-20, 2006
ROBUST DESIGN OF VERY HIGH-ORDER ALLPASS DISPERSION FILTERS
Jonathan S. Abel*
Julius O. Smith
available at:
http://www.dafx.ca/proceedings/papers/p_013.pdf


...
> 
> I figured id throw the equations in Matlab and see what if i could mimic
> the resuls and got stuck and the wrong result.

Does this mean you tried your code on the example in the paper and your code didn't work? If not, why not?

Dale B. Dalrymple