[sdiy] Walsh experimenter's board info up

[ASSI]

Hi Tim,

On Sonntag, 27. August 2006 03:46, Tim Ressel wrote:
> Walsh functions are like fourier synthesis, but
> instead of adding together sine waves it adds together
> pulse trains that have useful spectral content. See
> the article here for a better explanation:
> http://home.comcast.net/~t.ressel/walsh.html

Thanks for putting up that paper by Jacoby, where was it published?

Comments: 

The Walsh synthesis is as additive as Fourier synthesis and not at all 
subtractive.  The canceling of harmonics results from the 
multiplication in the time domain (remember that Walsh functions are 
polynomials of Rademacher functions), which produces a convolution in 
the frequency domain.

The Walsh coefficients you show are normalized to the largest 
coefficient and not for constant amplitude (these are -Pi/2 and -2 
respectively) and seem to be geared towards an inverting signal path.  
You may want to add a remark about that so that people don't get 
confused when they compare these coefficients with other sources.


Achim.
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