[sdiy] Hadamard Transform Network

[Steve Lenham]

Ooh - are you thinking of the Seiko DS-250?

Looks like a cheap Casio, uses additive synthesis of some type, played 
on parts of Rendezvous?

As coincidence would have it, I collected a DS-250 on Saturday night. 
I'm having a bit of a Seiko DS-xxx period - they are a interesting 
technological cul-de-sac - and hope to write up what I find one day.

I had assumed that they just used sinewaves, but will have to take a 
closer look now.

In fact, if anyone else in the UK is interested in joining the dark side 
then the same seller has a second unit for sale - see eBay item 
#201923566255. She used to work in Seiko's watch division and bought one 
for herself and one for her mother! They both have/had some rare ROM 
carts and a not-very-desirable external sequencer included too.

Cheers,

Steve L.
Benden Sound Technology


On 15/05/2017 09:05, Neil Johnson wrote:
> Look up Walsh Functions.  I seem to recall some oddball synth from way
> back used them - I think JMJ played it on a number of tracks.
>
> Neil
>
> On 14 May 2017 at 15:21, Elain Klopke <functionofform at gmail.com> wrote:
>> So I came across a print out of Bernie Hutchins' "Application of a Real-Time
>> Hadamard Transform Network to Sound Synthesis" paper while I was clearing
>> out my storage locker last week. I know I didn't have a clue what was being
>> said in it back when I printed the thing off and I'm glad to report that it
>> actually makes sense now.
>>
>> My question is, have any of you played with this?
>>
>> here's a link to the paper for reference:
>> http://electronotes.netfirms.com/AES2.PDF