Simulating Airband AM Radios(bitbashing.io)
54 points by shellpipe | 4 comments
Blog post from Bit Bashing about simulating airband AM radio audio effects for voice chat in the Falcon BMS combat flight simulator.
#signal-processing on Hacker News
16 stories tagged signal-processing, newest first.
Fourier Analysis: Drawing Llamas with Circles(adekau.github.io)
61 points by cebert | 7 comments
A blog post explaining the Fourier transform and using rotating vectors (epicycles) to draw a llama outline, covering complex numbers and linear algebra.
Tracing a powerful GNSS interference source over Europe(arxiv.org)
405 points by mimorigasaka | 211 comments
arXiv paper analyzing and identifying a space-based GNSS interference source causing wide-area interference events over Europe, Greenland, and Canada since 2019.
Understanding the Kalman filter with a simple radar example(kalmanfilter.net)
399 points by alex_be | 54 comments
KalmanFilter.NET, a tutorial site introducing the Kalman filter algorithm with intuitive examples such as radar tracking, promoting an accompanying book.
JPEG Compression(sophielwang.com)
376 points by vinhnx | 102 comments
A personal blog post explaining how JPEG image compression works by exploiting human perceptual bias through a change of basis before encoding.
Jimi Hendrix was a systems engineer(spectrum.ieee.org)
643 points by tintinnabula | 227 comments
IEEE Spectrum article arguing Jimi Hendrix acted as a systems engineer, precisely controlling modulation and feedback loops in his guitar rig.
Project Patchouli: Open-source electromagnetic drawing tablet hardware(patchouli.readthedocs.io)
416 points by ffin | 48 comments
Documentation site for Project Patchouli, an open-source electromagnetic resonance pen tablet hardware implementation with coil array, RF front end, and DSP algorithms.
How the cochlea computes (2024)(dissonances.blog)
460 points by izhak | 142 comments
A Substack post on the dissonances blog explaining how the cochlea encodes sound and arguing that the ear does not perform a Fourier transform.
The scientific “unit” we call the decibel(lcamtuf.substack.com)
558 points by Ariarule | 438 comments
A blog post on lcamtuf's Substack arguing that the decibel is a confusing, inconsistent scientific unit.
Let's Write a Reverb (2021)(signalsmith-audio.co.uk)
348 points by notagoodidea | 60 comments
Blog tutorial by Geraint Luff of Signalsmith Audio on designing a smooth, high-quality reverb using a variation of the feedback-delay network structure.
MLow: Meta's low bitrate audio codec(engineering.fb.com)
551 points by mikece | 188 comments
Engineering at Meta blog post introducing MLow, Meta's low bitrate audio codec for real-time calling.
Ultrasonic investigations in shopping centres(windytan.com)
332 points by GolDDranks | 131 comments
Blog post by Oona Räisänen investigating near-ultrasonic beacon tones emitted by PA systems in shopping centres, with spectrum analysis.
An animated introduction to Fourier series(andreinc.net)
559 points by gaws | 83 comments
A blog post by Andrei Ciobanu giving an animated, visual introduction to Fourier series, starting from circles and building up to epicycles; part 1 of a series.
Sir, there's a cat in your mirror dimension(lcamtuf.substack.com)
410 points by zdw | 64 comments
A blog post on lcamtuf's Substack explaining frequency-domain transforms and their properties, illustrated with a cat image hidden in an alternate frequency domain.
How does Shazam work? (2022)(cameronmacleod.com)
482 points by TaurenHunter | 135 comments
Blog tutorial by Cameron MacLeod explaining how Shazam's audio fingerprinting song recognition works, building a clone called abracadabra.
A non-mathematical introduction to Kalman filters for programmers(praveshkoirala.com)
588 points by pkoird | 92 comments
A blog post by Pravesh Koirala explaining Kalman filters to programmers without heavy mathematics.