Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!tut.cis.ohio-state.edu!gem.mps.ohio-state.edu!apple!kchen
From: kchen@Apple.COM (Kok Chen)
Newsgroups: comp.dsp
Subject: Re: Hartley xform
Message-ID: <35286@apple.Apple.COM>
Date: 4 Oct 89 23:45:25 GMT
References: <wZ_UwgC00UkM8KM0RN@andrew.cmu.edu>
Organization: Apple Computer Inc., Cupertino, CA
Lines: 20

steve+@andrew.cmu.edu (Stephen Webster) writes:

>*   The FHT uses a purely real kernel (sin + cos) instead of the FFT's
>imaginary kernel (sin + j cos).  (Yes, ``j'', dammit.  I'm an engineer.)
 ^^^^^^^^^         ^^^     ^^^

But... even engineers use (cos + i sin) as the kernel instead of
(sin + i cos), I hope!  :-) :-) :-)  And, don't forget the real part of
the complex kernel.

I.e., exp(0) = 1, not sqrt( -1 ).

Regards (from an engineer),

Kok Chen			kchen@apple.COM
Apple Computer, Inc.
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Kok Chen			kchen@apple.COM
Apple Computer, Inc.