this post was submitted on 03 Oct 2023
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Linux
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From Wikipedia, the free encyclopedia
Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).
Distributions include the Linux kernel and supporting system software and libraries, many of which are provided by the GNU Project. Many Linux distributions use the word "Linux" in their name, but the Free Software Foundation uses the name GNU/Linux to emphasize the importance of GNU software, causing some controversy.
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God damnit. I wrote an answer and it disappeared a while after pressing reply. I am lazy to rewrite it and my eyes are sore.
Anyway, I am too dumb to actually understand I/Q samples. It stands for In-Phase and Quadrature, they are 90° out of phase from each other. That's somehow used to reconstruct a signal. It's used in different areas. For me it's useful to record raw RF signals from software defined radio (SDR).
For example, with older, less secure systems, you could record signal from someone's car keyfob, then use a Tx-capable SDR to replay it later. Ta-da! Replay attack. You unlocked someone's car.
In a better way, you could record raw signal from a satellite to later demodulate and decode it, if your computer isn't powerful enough to do it in real-time.
If you want an example, you can download DAB+ radio signal recording here: https://www.sigidwiki.com/wiki/DAB%2B and then replay it in Welle.io (available as Appimage) if it's in compatible format. I haven't tested it.