Re: Linear phase and impulse response symmetry
- From: Tim Wescott <tim@xxxxxxxxxxxxxxxx>
- Date: Tue, 11 Mar 2008 08:24:29 -0800
Pawel wrote:
On Mar 11, 11:04 am, prulikow...@xxxxxxxxx wrote:Dear All,
First of all I am not DSP engineer, scientist whatever. I am
researcher working with microwave and RF systems, so real bare iron is
well known to me.
I have following question: Is it possible to have nonlinear phase in
frequency domain (nonconstant group delay) and non-symmetrical impulse
response in time domain?
Regards
Pawel
OOOps actually it should be Is it possible to have nonlinear phase in
frequency domain (nonconstant group delay) and symmetrical impulse
response in time domain?
A signal that has even symmetry around 0 will have a Fourier transform that is purely real with even symmetry, and visa-versa. Delay this signal to be symmetrical around some other point in time and the phase will be some constant times the frequency -- i.e. the group delay will be constant.
Unless I've muffed this fairly basic math, then the answer to your question is no.
--
Tim Wescott
Wescott Design Services
http://www.wescottdesign.com
Do you need to implement control loops in software?
"Applied Control Theory for Embedded Systems" gives you just what it says.
See details at http://www.wescottdesign.com/actfes/actfes.html
.
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