[sdiy] Hadamard Transform Network

[Joel B]

I have a couple of these - but with the DS-310 additive synthesis module, otherwise it's just a preset keyboard with split & layering features.

Pretty sure these things are FT or FFT based digital additives though, Supposedly there were plans to for a external computer control but that remains obscured in the mists of time... love to see any analysis of a unit if someone takes it apart!

Joel

Sent from my iPhone 

> On May 15, 2017, at 1:40 AM, Steve Lenham <steve at bendentech.co.uk> wrote:
> 
> 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
> 
> 
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