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We built SPECTRA — a system for transmitting real digital data, camouflaged as natural sounds and optical phenomena.

No Wi-Fi, no GSM, no internet. Just binary or ternary encoded signals hidden in what looks like environmental noise: bird chirps, light flickering, wind-like modulations.

Instead of obvious radio signals, SPECTRA uses:

Acoustic masking: frequency-shifted codes embedded in naturally sounding audio patterns.

Optical masking: binary or RGB ternary codes transmitted through LEDs and lasers, camouflaged as normal light variations.

The goal: create a resilient, stealthy communication system that can survive when conventional networks fail or are under surveillance.

Inspiration came from how native tribes imitated birds to send messages — now reimagined with embedded microcontrollers and dynamic adaptation.

We combined optical + acoustic transmission to boost survivability under different environmental conditions.

Early prototype and more details: https://alexs749266.github.io/SPECTRA-Communication/

Happy to hear any thoughts or hack ideas!

Comments URL: https://news.ycombinator.com/item?id=43803649

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Article URL: https://github.com/Seanium/feedme

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Article URL: https://www.nytimes.com/2025/04/26/us/virginia-giuffre-dead.html

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Article URL: https://my-fit-ai.com

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Article URL: https://medium.com/expats-founders/vibe-coding-you-may-need-this-50-supabase-credit-38bc602862dc

Comments URL: https://news.ycombinator.com/item?id=43803635

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Article URL: https://valics.medium.com/the-hype-software-developer-253936a6bb2d

Comments URL: https://news.ycombinator.com/item?id=43803615

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Article URL: https://www.cnn.com/2025/04/25/asia/south-korea-deepfake-crimes-intl-hnk-dst/index.html

Comments URL: https://news.ycombinator.com/item?id=43803596

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Lately a friend of mine has been working on a personal project and I wanted to share it. The goal of Diffulab is to provide a flexible and modular framework for training diffusion models from scratch. The project is still in its early stages, and he is actively working on adding new features and improvements.

Comments URL: https://news.ycombinator.com/item?id=43803593

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Article URL: https://www.wsj.com/sports/sven-coomer-modern-ski-boot-designer-dies-36b3d14b

Comments URL: https://news.ycombinator.com/item?id=43803577

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Article URL: https://www.cockroachlabs.com/blog/regional-by-row/

Comments URL: https://news.ycombinator.com/item?id=43803292

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Article URL: https://softwaredoug.com/blog/2025/04/26/stop-overbuilding-evals

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Article URL: https://www.ovhcloud.com/asia/public-cloud/cold-archive/

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Article URL: https://simonwillison.net/2025/Apr/26/o3-photo-locations/

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Article URL: https://twitter.com/G4brym/status/1915889702218928199

Comments URL: https://news.ycombinator.com/item?id=43803190

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Article URL: https://isocpp.org/blog/2025/04/video-cpp-standardization-at-using-stdcpp-2025

Comments URL: https://news.ycombinator.com/item?id=43803178

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Article URL: https://blog.hermesloom.org/p/reconsidering-money-the-case-for

Comments URL: https://news.ycombinator.com/item?id=43803170

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Article URL: https://arstechnica.com/science/2018/10/turbulence-the-oldest-unsolved-problem-in-physics/

Comments URL: https://news.ycombinator.com/item?id=43803162

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Article URL: https://aurorasaurus.org/

Comments URL: https://news.ycombinator.com/item?id=43803155

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Finally got my hobby OS up and running on real hardware. I love the old IBM thinkpads, so thought it was the perfect machine to get it working on. Been working on it for quite some time now, but this has been a big milestone!

Comments URL: https://news.ycombinator.com/item?id=43803148

Points: 2

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Hello HN! I'd like to share Gemini Document Processor, an open-source tool I've developed.

This tool uses Google's Gemini AI (their latest API) to create high-quality Thai language summaries from PDF and EPUB files. Key features include:

- Support for both PDF and EPUB files - Intelligent chunking for efficient Gemini API processing - Automatic image extraction from documents - Direct integration with Obsidian (export directly to vault) - Smart retry system when errors occur (switches models/increases timeouts) - Real-time progress tracking via web interface

I built this tool because I needed to read many English documents and wanted detailed summaries in Thai.

If you frequently read long documents or want to build a knowledge base from multiple sources, this tool could save you significant time.

The output is a well-formatted Markdown file with images and metadata, ideal for storing in Obsidian, Notion, or other PKM systems.

Try it by cloning the repo and running it with Python (requires a Google Gemini API key).

Feedback, suggestions, and contributions are very welcome!

Comments URL: https://news.ycombinator.com/item?id=43803143

Points: 1

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