Tag "sound"

Let’s build an MP3 decoder (2008)

Even though MP3 is probably the single most well known file format and codec on Earth, it’s not very well understood by most programmers – for many encoders/decoders is in the class of software “other people” write, like standard libraries or operating system kernels. This article will attempt to demystify the decoder, with short top-down primers on signal processing and information theory when necessary. Additionally, a small but not full-featured

How We Reverse Engineered the Cuban “Sonic Weapon” Attack

Throughout last year, mysterious ailments struck dozens of U.S. and Canadian diplomats and their families living in Cuba. Symptoms included dizziness, sleeplessness, headache, and hearing loss; many of the afflicted were in their homes or in hotel rooms when they heard intense, high-⁠pitched sounds shortly before falling ill. In February, neurologists who examined the diplomats concluded that the symptoms were consistent with concussion, but without any blunt trauma to the head. Suggested culprits included toxins, viruses,