Electronics > Projects, Designs, and Technical Stuff
What storage medium do "off the shelf" guitar looping pedals use?
Siwastaja:
--- Quote from: MasterBuilder on July 24, 2020, 10:31:05 am ---This sounds like its getting way over complicated. Why go digital.
--- End quote ---
Because any analog solution would be massively expensive and complex.
There is a reason this complete product segment has born after digital audio processing emerged.
You could do that with tape, yes, but this would be a mechanical challenge, mainly because you would want to adjust the loop length, possibly have multiple loops and be able to dispatch them whenever you want.
--- Quote ---Look up bucket bridge delay.
--- End quote ---
Completely irrelevant.
MasterBuilder:
--- Quote from: coppice on July 24, 2020, 10:34:12 am ---
--- Quote from: MasterBuilder on July 24, 2020, 10:31:05 am ---This sounds like its getting way over complicated. Why go digital.
Look up bucket bridge delay.
Old guitar pedals used parts such as MN3208.
It's datasheet says 102mS delay time.
There is some good parts here for both analog and digital delays.
https://electricdruid.net/?s=delay&x=0&y=0
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The OP wants a looping solution, not a delay. They need persistent storage (at least persistent until the power is switched off).
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Fair enough, I read looping station and immediately thought Delay.
TheUnnamedNewbie:
Even for just delay, bucket brigade chips are an expensive and complex solution.
The delay pedals that still use them are generally way more expensive, because they require NOS chips. I seem to recall someone doing a re-tape of one of the old bucket-brigade delays, but don't know if that ever actually happened.
I think a lot of these kinds of pedals will be using low sample rate (no need to sample up to high frequencies, as others have said - 20-30 kSa/s is probably sufficient). Probably just need 8 or 10 bits to do it too. I suspect there might be some DSP SoCs or similar that contain sufficiently DRAM to pull it off in a single-chip solution. And you don't need to be able to store like 5 loops at the same time, I think the pedal will just store the additional loop on top of the existing ones.
amyk:
I suspect they may use realtime compression/decompression, could be a proprietary or standard codec, but only one way to find out - buy one and RE it.
mikerj:
--- Quote from: TheUnnamedNewbie on July 24, 2020, 12:56:55 pm ---Even for just delay, bucket brigade chips are an expensive and complex solution.
--- End quote ---
Also very noisy.
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