On Tue, 26 Jul 2016 11:11:23 +0000
<alan.b.pearce@stfc.ac.uk> wrote:

> This one?

I believe NXP is the component branch of Philips.

I have some references - I'll find the Motorola one yet:

Applications of Walsh functions in Communications
  IEEE Spectrum November 1969

Introduction to Walsh functions and sequency filters
  J.P. Golden (Feb 1971) (no URL)

Walsh functions: A digital Fourier series
  Bejamin Jacobi PhD
  -> I think this is basically the Motorola Appnote.
  by the letter font and layout, I think it's an article from
  Byte magazine.
	http://www.wiseguysynth.com/larry/schematics/walsh/walsh.pdf

  (It *is* an article from Byte: BYTE , September 1977. I found the
   issue on-line: http://www.americanradiohistory.com/Archive-Byte/70s/Byte=
-1977-09.pdf
   The article also appeared in 'The BYTE book of Computer Music')

 *I KNOW I have the Appnote here somewhere. Can't find it though.

John

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