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Re: Alternative to unwrap()
From: |
Sepp Käsbauer |
Subject: |
Re: Alternative to unwrap() |
Date: |
Sun, 18 Jul 2010 10:52:56 +0200 |
User-agent: |
KMail/1.9.10 |
Am Samstag, 17. Juli 2010 schrieb Børge Strand-Bergesen:
> I'm working with Fourier Transforms. In my application,
> discontinuities add a lot of problems. (I'm writing a program that
> compares the gain and delay responses of a computer generated filter
> to those preferred by a user.) I wouldn't know which journals to start
> reading to improve on unwrap().
>
> One idea I have been toying with is to add n*pi to the angle of each
> polar coordinate instead of n*2pi (for integer n). Whenever n is odd,
> I compensate by negating the absolute value. This "bipolar absolute"
> actually works very well, and I'm able to extract continuous phase and
> delay plots. Unfortunately, my method is a bit cumbersome and a far
> cry away from a one-size-fits-all. I need to be confident that the
> method works for a wide range of filters. Eventually it will have to
> be optimized for high-speed paralell execution.
>
> So any pointers to research on clever unwrap functions would be
> greatly appreciated.
Just a few pointers to documents. If you cant find them, drop me a note.
A New Recurrent Approach for Phase Unwrapping
Kattoush Abbas *
-------
A Simple and Reliable Phase
Unwrapping Algorithm
Eduard KRAJNIK
-------
Phase Unwrapping: A Review of Methods and a Novel Technique
Sam T. Kaplan*
University of Alberta, Edmonton, AB, Canada
address@hidden
and
Tadeusz J. Ulrych
University of British Columbia, Vancouver, BC, Canada
-------
Computation of the One-Dimensional
Unwrapped Phase
by
Zahi Nadim Karam
-------
PHASE UNWRAPPING ALGORITHMS IMPLEMENTED ON
A SYMBIAN BASED MOBILE DEVICE
Carol RUS, Lacrimioara GRAMA, Andrei DUSLEAG, Corneliu RUSU
--------
Exact Computation of the Unwrapped Phase of a Finite-Length Time Series
David G. Long
--------
>
>
> Thanks,
> Borge
cu Sepp
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