151–160 of 900 posts
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Absorbing low (male voice; 80Hz - 300Hz, not including overtones) frequencies normally takes a fair bit of dampening material, unless something like a Helmholtz resonator [1] is used. The paper shows that a ~100x100x12mm 3D printed Helmholtz resonator may entirely absorb 125.8Hz (in an extremely narrow band). I'm uncertain about transmission losses (i.e. volume of the frequency perceived behind the material).
So far, I have created/vibe-coded a script to take the inputs: frequency and tile dimension (it's square). The output is a 3D object (.stl) which can be printed.
Today I tested my 3D model, which roughly resembles the model in the paper (1mm roof & floor as opposed to 0.2mm, because of printing difficulties), by using a DIY'D impedance tube and publicly available software [2]. The print was meant to be tuned at 125Hz, but results showed 131Hz and absorption factor of ~0.42 (lower number as opposed to 1.0 may be due to inexperience with all of this; it may be due to an imperfect test setup).
My impedance tube is made from 96mm (inner) diameter PVC tube, a Visaton KT 100 V 4 Ohms speaker, an amplifier, Motu M2 audio interface, 2 Behringer ECM8000 measurement mics and some 3D printed adapters (to hold the speaker and sample).
Nothing to concretely publicise or share so far, but am thoroughly enjoying the process of digging into a field (acoustics) completely new to me, solely out necessity and/or frustration in the workplace.
Should anyone be interested, I will share my project with HN once it has progressed to where I have something written up or worth sharing.
[0] http://dx.doi.org/10.1063/1.4941338
I've been working on a little utility to transfer files between two computers using QR codes: https://github.com/cibyr/qftf It's kinda like Magic Wormhole without typing. It uses iroh for the p2p networking - on both ends, and also in the little web app that you use to scan the QR codes and start the transfer.
Have you seen https://file.pizza/ FilePizza? Similar concept using WebRTC
Optimizing the Marginalia Search index code. The new code is at least twice as fast in benchmarks, but I can't run it in production because it turns out when you do it's four times as slow as what came before it for the queries that are the simplest and fastest to the point where queries exceed their timeout values by a lot. I'm 97% certain this is because the faster code leads to more page thrashing in the mmap-base…
You make it sound like I was trying to troll everyone when we wrote that paper. We were warning you.
Unlike its competitors, it uses proven research and techniques to measure the issues, as well as the improvements.
https://groundme.app/what-is-ground-me
Test users and early adapters are very welcome
Programming for me has become a lot more fun because of Claude Code. I get to spend more time planning and researching.
I have been working on https://codient.dev to be able to run Claude Code agents in the background without setting up a local IDE!
My roommate and I are still working on Tornyol, our mosquito killing drone! It uses ultrasonic sonar to detect mosquitoes, and missile control theory to ram into mosquitoes and grind them in its propellers. Our target platform is a 40 grams tinywhoop so it’s safe to fly everywhere and makes almost no noise :). A Roomba for mosquitoes! The main plus compared to traditional systems is that a drone can cover an enormous…
My friend once came up with a joke idea for a solar powered ransomware drone that would fly to a random roof and jam wifi signal until someone paid it to leave.
Still working on https://phrasing.app - an app for polyglots to learn over 120 languages in the most effective manner and a beautiful UI. Just finished a onboarding flow, now updating the search and create experience to fall more in line with actual usage from users, then hopefully prepping for a more public launch :) Had a fun week fixing up the application so it’s 100x faster on 5 different axes, and it’s starting…
Why would you need a UI if the basic way to learn a language is to speak to someone? (I suppose you meant graphical UI.)
Wouldn't a good STT/TTS interface be more appropriate?
I've been building Crossabble ( https://crossabble.com/ ) a free and fun weekly web word game. Feedback welcome! The game is mostly done, so I'm now focused on tooling to make it easier for me to craft each week's puzzle. I'm solving some interesting graph and optimizations problems