[sdiy] Frequency shifted from BBD?

[Todd Sines]

My analogue time domain processing is limited to a Marshall Time Modulator and Klark Teknik DN-36. Neither offer full pitch shifting. For digital pitch shifting, once owned a Publison DHM 89, and still have an Eventide H949 + H969, Deltalab DL-5, Boss RPS-10, Lexicon 1200, and Varispeech II (cassette version of the Varispeech 27Y) which is more like a time stretcher, in that you can alter the speech but keep the pitch the same (in order to decipher fast-speaking conversations)
https://obsoletetechnology.wordpress.com/repairs/lexicon-varispeech-27y/

Somehow this Schumann / clone seems like cheating and full of conversion artifacts — turning audio into a square wave with a PLL and creating overtones that sound like a cheap Halloween gag
https://www.youtube.com/watch?v=iH9YG25OyZE

The A/DA Harmony Synthesizer pedal used Reticon SAD1024 BBDs to accomplish some pretty dark pitch shifting, at least 2 were used that I can see from this listing.. that BBD artifacting shimmer is amazing.
https://reverb.com/item/4813895-a-da-harmony-synthesizer-1979-perfect-working-order-rare
https://www.youtube.com/watch?v=l_0ZfIule5Y
https://www.youtube.com/watch?v=RXnMgCSSRqQ

You should also take a look at these auction items at Vemia / Sphere Music for some nice photos of Anton Springer’s time changer by Telefonbau and an Eltro Mark I (sadly limited by early era coding)
https://spheremusic.com/Bargaindtl.asp?Item=28040
https://spheremusic.com/Bargaindtl.asp?Item=28039


> On Oct 7, 2024, at 4:03 AM, brianw <brianw at audiobanshee.com> wrote:
> 
> On Oct 6, 2024, at 1:07 PM, Terry Bowman via Synth-diy <synth-diy at synth-diy.org> wrote:
>> On Oct 6, 2024, at 3:51 PM, Florian Anwander <fanwander at mnet-online.de> wrote:
>>> There was the tape based solution, invented in the 1920s. (see https://valhalladsp.com/2010/05/04/pitch-shifters-pre-digital/) 
>> 
>> Don't skip past the linked Wendy Carlos post about the Eltro Mark II:
>> 
>> https://www.wendycarlos.com/other/Eltro-1967/
> 
> Thanks for pointing this out, Terry.
> 
> "Actually, his entire performance as HAL has a mild amount of time stretching (no alteration of pitch) going on, as Stanley confided to me. I told him I hadn't noticed it before, and he smiled: "it was about 10-20%, rather subtle.""
> 
> [...]
> 
> "And indeed, you couldn't do this simply by slowing down a regular tape recording, as many pundits have since wrongly guessed (to reach the final low pitch, the tempo would crawl to a near-stop)."
> 
> 
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