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Ferrit37

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Hi guy's,
I'm new here so please excuse a dumb question.
Doublet? I understand that it's another way of looking at an impulse response after its been through a Hilbert transform, but what exactly does it represent? What can it be used for?
I've googled and read Dick Heyser's papers (my head hurts) but I'm missing something here.

Warmest regards,
Ferrit37
Ferrit37

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Okay, after further reading I get it, real part, imaginary part, etc.
Thank you
Ferrit37
Doug

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Good job Ferriting ( sorry I could not resist) that out!

Doug

Ferrit37

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Hey Doug,
thanks, it only took me three hours..........

ferrit
Mark_Seaton

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Quote:
Originally Posted by Ferrit37
Hi guy's,
I'm new here so please excuse a dumb question.
Doublet? I understand that it's another way of looking at an impulse response after its been through a Hilbert transform, but what exactly does it represent? What can it be used for?
I've googled and read Dick Heyser's papers (my head hurts) but I'm missing something here.

Warmest regards,
Ferrit37


Hi Ferrit,

I would bet others might be interested in the links you found to some of Heyser's papers.  Mind posting those?

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Mark Seaton
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Ferrit37

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Hey Mark,
The two best references I could find were :-
http://www.prosoundweb.com/install/sac/n26_4/nyquist/nyquist.shtml
http://www.prosoundweb.com/install/sac/sup27/part1/mesp22.shtml

and of course Dick Heyser's Anthology from the AES "Time Delay Spectrometry"

Tom Danley also had this to say...

"you have two planes of reference, Real and Imaginary, Real is resistive or “work” and is “in phase”, Imaginary is reactive energy and this is 90 degree in phase away from Real plane.

The Energy Time Measurement is the total sum of energy as it was distributed in time.
That energy has both real and imaginary components, the Real component is called the impulse response, the view of the energy from the imaginary plane is the Doublet response.
Search the “Heyser spiral” which combines these two with time into a 3d view.

The Hilbert transform is a broad band flat amplitude 90 degree phase device. It can (with a lot of parts) be made from R’s and C’s or done in DSP"

very succinct, as always from Tom.

Hope this helps,
Ferrit

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