If you don’t need it to be perfect it is actually not too difficult. A notch filter could be enough remove most of the pattern provided that you have a good way of guesstimating its frequency
I have a friend who built one of these as their thesis. IIRC they were telling me that the air through which the sound beam propagates acts as a low pass filter, so if you're at the correct distance from the device the high frequency energy should have dissipated.
Interesting stuff, I wish I had more time to learn about what they where doing.
Not sure if there are standing waves involved, or resonance. I presume it is very similar to a phased array [1] for beamforming in antennas, except that then anisotropic properties of medium may not be negligible to construct the wavefront (temperature gradients & wind), which is probably also why these devices do not sound great. To produce a high quality waveform at the receiving end the physics probably becomes quite involved rather quickly.
I am quite skeptical about the possibility of condensing the complexity of “intelligence” down to a single number “g”, but even if this were some kind of approximate metric for actual intelligence, I do not see how this type of “research” is of any use. It only seems to promote unnecessary social abrasion by letting those who belong to the more “intelligent” fields inhale too deeply of their own success and making the others feel less. It is at best misleading and at worst borderline eugenics.
> But the official reMarkable client is not available for Linux, which I find a bit odd, since it is a Qt-app and the founder of the company apparently is an avid linux user.
If I had to guess it's probably because they want to keep it closed-source and that is a nightmare with linux distro packaging. I have also used the tables via the webapp like you for many years.
These days they could package it as a Flatpak and cover a lot of distros with out a lot of duplicate work. I mostly use Flatpak for those types of apps these days.
The DPT-RP1 line was acquired by Fujitsu and is now sold at the Quaderno. The hardware has been updated a bit in the Quaderno Gen 2, including a Wacom digitizer. They're still great devices, and the same open source software for the DPT-RP1 (dpt-rp1-py) works with both Quadernos.
You're linking to dpt-tools. I've never tried that software.
I have a Quaderno Gen 2 and personally use dpt-rp1-py (https://github.com/janten/dpt-rp1-py), so I can confirm that at least it works. (When I first set it up, I had to run the "dptrp1 register" command twice because I got an error message the first time, but that hasn't come up again -- you only have to register it once on a given computer.)
> with some linux distro with touch support, unlocked bootloader and ssh, powered by a microcontroller with mainline linux support, no fancy apps, no cloud service and no subscription
I am also not a fan of the subscription model & pricing scheme but I guess that is how they want to pay back their investors. However, besides this they are (relatively speaking) also a pretty open company with a sizable community on github maitaning a lot of custom tools / applications. They do not provide official support for these modifications, but these tablets are definitely not locked-in like an ipad or impossible to tinker with because of obscure undocumented chinese hardware
The reMarkable company has been super adversarial to a lot of these tools, and the file standards and API have been moving goalposts for years. MOST of the tools on that Awesome list are defunct because the primary open source tools for getting data to the reMarkable cloud (rmapi and rmapy) are no longer maintained — the primary maintainers both cite reMarkable's moving target API as the final dealbreaker. SUPER sad.
I've been hoping to write my own now that the dust has settled, but it's definitely a MAJOR project yet to be done by the FOSS community.
I started tinkering with their cloud API and it's not a major work at all to create a client to it, I managed to create a POC uploading and managing files on their cloud in a weekend. I still need to polish it a little bit and make sure I cover all the possible operations but definitely doable.
I concur. I switched from the very first remarkable to an ipad pro with paperlike but it's very different and much less paper-like. Also, the paperlike screen protector lost lost 100% of the roughness in just a few months, and now when I write it's basically the same as writing on the glass.
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