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Here are some ressources related to Acoustic, Frequency, Sound. Hoping you will find learning material, alternative tools or just some interesting stuff.

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Articles

Who pays the price when cochlear implants go obsolete?

See discussion (51 comments, 85 points) - Archive

Low Cost CO2 Sensors Comparison: Photo-Acoustic vs. NDIR

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AirPods causing tinnitus?

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How to date a recording using background electrical noise

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How to date a recording using background electrical noise

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Effects on the lips of horn players seated too close to the timpani (2014)

See discussion (50 comments, 139 points) - Archive

Roland’s 50th Anniversary Concept Piano

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French startup unveils new residential thermo-acoustic heat pump

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Vertical Flutes

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Scientists discover mechanism of hearing

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Sound

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AI-driven thermal cameras used to obtain passwords

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Trombone Champ turns all songs into tooting works of genius

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Effects of grill patterns on fan performance/noise (2011)

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Outdoor Sound Propagation in the U.S. Civil War (1999)

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How far behind a plane is its noise?

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Ceiling Air Purifier

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Researchers discover way to 3D print directly inside the body without surgery

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New type of 3D printing uses sound waves to build up objects

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Study confirms superior sound of a Stradivari is due to wood treatment (2021)

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The Sound of Bells – The acoustics, sound, tuning and history of church bells

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Music Tuned to 440 Hz versus 432 Hz and Health Effects (2019)

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Bridge spiders build webs that double as acoustic arrays

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Why do we tune in 5ths?

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The human ear detects half a millisecond delay in sound

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World’s smallest, best acoustic amplifier emerges from 50-year-old hypothesis

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Spatial Audio

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A technique that enables people to hear ultrasonic sources above 20kHz

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History of the Nautilus loudspeaker

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How I built the world's first 3D ultrasonic scanner

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Why do drum sets have descending toms?

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AirPods Causing Tinnitus (600+ reports since 2019?)

See discussion (171 comments, 233 points) - Archive

A speaker placement tip that speaker manuals get wrong (2017)

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Noise-canceling headphones without the headphone

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Moths draped in stealth acoustic cloak evade bat sonar

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Estimating the ROI of Insulation

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$1 hearing aid could treat millions with hearing loss

See discussion (191 comments, 633 points) - Archive

Veteran submariner on how sonar crews tirelessly hunt enemies they can't see

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Spies can eavesdrop by watching a light bulb's vibrations

See discussion (123 comments, 268 points) - Archive

Audio Engineers Built a Shield to Deflect Police Sound Cannons

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LoCHAid – An ultra-low-cost, affordable and accessible hearing aid device

See discussion (40 comments, 85 points) - Archive

Mercedes-Benz pre-safe sound

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Every Noise at Once

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Everything You Should Know About Sound (2016)

See discussion (39 comments, 171 points) - Archive

13-Year-Old Scientist's Research Shows Hand Dryers Can Hurt Kids' Ears

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Engineers create synthetic, sound-silencing structure that blocks 94% of sounds

See discussion (45 comments, 121 points) - Archive

Calgary student has been studying decibel levels in hand dryers since age nine

See discussion (320 comments, 681 points) - Archive

Show HN: Harmopark – Web tool to visually build chords and progressions

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24/192 Music Downloads and why they make no sense (2012)

See discussion (314 comments, 295 points) - Archive

New Technology Uses Lasers to Transmit Audible Messages to Specific People

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Why are pianos traditionally tuned “out of tune” at the extremes?

See discussion (61 comments, 105 points) - Archive

Concrete blocks that once protected Britain

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Teach Yourself to Echolocate: A beginner’s guide to navigating with sound

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Recreating the THX Deep Note (2009)

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Thermanator Attack Steals Passwords by Reading Thermal Residue on Keyboards

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Show HN: How to Tune a Guitar

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Million-dollar Strads fall to modern violins in blind ‘sound check’

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I almost lost my hearing from the lid on the tank of a toilet

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Examining overlooked clues reveals how ultrasound could have caused harm in Cuba

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Stochastic Resonance

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"Sonic attack" may have been two ultrasonic signals accidentally interfering

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If you watch closely enough, everything is a speaker

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Objects larger than the wavelength of sound in an acoustic tractor beam

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Cuban Embassy Attacks and the Microwave Auditory Effect

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Inside the quietest place on Earth

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About Drums: the physics of overtones

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An Alarm Designer on How to Annoy People in the Most Effective Ways

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The “432 Hz vs. 440 Hz” conspiracy theory

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PCB Design Tutorial for Startups

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LIGO's vibration isolation system

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24/192 music downloads make no sense

See discussion (228 comments, 325 points) - Archive

Trade secrets of the oldest family firm in the US (2012)

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Stochastic rain generator from the author of myNoise.net

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Fighting fires with sound frequencies

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Motion sensing using the doppler effect

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How speakers make sound

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Recreating the THX Deep Note

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Analysis of suspected MH370 pings recorded by Ocean Shield

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Yamaha's Latest Silent Brass

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How Daft Punk Created One of Their Most Famous Samples

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The Visual Patterns of Audio Frequencies Seen through Vibrating Sand

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The hum that helps to fight crime

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There is no point to distributing music in 24-bit/192kHz format.

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Vibrations Invisible to the Human Eye Shot at 1,000 Frames Per Second

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Ultrasound Enables Remote 3-D Printing – Even in the Human Body

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Organ pipe physics

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Stable-Audio-Demo

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Chime Design and Build

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The Grateful Dead's Wall of Sound (2019)

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Sound-suppressing silk can create quiet spaces

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Stable Audio Open

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Open source laser microphone picks up laptop keystrokes

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Caltech Develops First Noninvasive Method to Continually Measure Blood Pressure

See discussion (80 comments, 269 points) - Archive