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Questions tagged [sound]

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5 votes
2 answers
940 views

How to build apartment floors/ceilings to not transfer sound?

How do new apartment buildings build their floors/ceilings to prevent the transfer of sound between people living above/below each other? Note: I'm not asking about how to soundproof an existing ...
Michael Altfield's user avatar
0 votes
2 answers
99 views

Are Apple Airpods capable of producing 165 decibels of sound?

Inspired by this article, where a Texas family claim that an "Amber Alert" on their son's Airpods caused his eardrum to rupture. https://www.dailymail.co.uk/news/article-10830803/Boy-...
user47776's user avatar
0 votes
2 answers
48 views

Most sound proof earmuffs in the world

What soundproofing material can I replace the foam in my Sthil earmuffs with to block out leaf blowers completely. I mean the absolute highest power blackout capability possible. Crazy ideas welcome, ...
Julian's user avatar
  • 1
0 votes
0 answers
48 views

Vibrating hollow sphere

I would like to make a hollow sphere that can vibrate like a tuning fork. It should go like this: Place the sphere on a table Strike the sphere with something like a spoon The sphere vibrates (...
Riemann's user avatar
  • 121
1 vote
1 answer
25 views

Designing a siren to vary pitch with port width/pattern. Advice needed

Background: I am trying to design a multi-pitch port siren with one central shaft at 3300 rpm. I've calculated the number of ports needed for each frequency to be n = f(60/rpm). This approach gives me ...
Jordan Iversen's user avatar
0 votes
1 answer
113 views

How to identify the source of low frequency noise from the street?

Is there a way to identify the source of low frequency (166Hz) noise coming from the street (I suspect from the opposite building in the closed yard in the city)? The noise comes hearable in the yard ...
Damir Tenishev's user avatar
1 vote
2 answers
62 views

High voltage wires

We have bought a house near high tension wires (at a distance of around 20m). Will it be noisy during the rains, and more importantly will the ionization increase the risk of cancer?
Shrey Iyer's user avatar
0 votes
2 answers
119 views

Secondary glazing 16 to 20cm away from double glazing

I have double glazing (optimized for sound protection) on a 2m-by-2m window. What would be the effect (sound insulation and thermal insulation) of an additional layer of glazing about 16cm away from ...
H A Helfgott's user avatar
0 votes
0 answers
22 views

What recording cable is suitable for F999R?

F999R is a needle microphone device, with following outputs: outputs for headphones, what are included some kind of "recording" output. Hearing through the headphones provided is fine, ...
user43156's user avatar
1 vote
3 answers
200 views

Do sound waves caused by a vibrating machines correlate to the vibration waves of the machine itself?

I'm a computer engineer, so please excuse my lack of mechanical knowledge :). We have a machine that has large electrical motors causing massive amounts of vibrations, the machine also consists of ...
Rikus Coetzee's user avatar
0 votes
0 answers
20 views

Is it possible / practical to use a directional speaker as a "sound flashlight"?

E.g. use the direction the sound is coming from and the intensity to tell where the object is located at, and the frequency to tell the color of whatever this "flashlight" is pointing at (e....
qwerty_99's user avatar
  • 101
0 votes
1 answer
33 views

the low sensitivity of a dome mounted tweeter in sound testing

What is the common reason and how to solve the low sensitivity of a dome mounted tweeter in sound testing? The testing software is a Soundcheck dome tweeter, and the sensitivity of sound testing is ...
yayyayyay's user avatar
0 votes
2 answers
90 views

Materials that will block water but allow sound to travel through without being muffled

I am in a fraternity at my college. We would like to host a paint party but are worried about our speakers getting damaged. The paint used is water based, so very thin. The paint is made using ...
Andrew's user avatar
  • 1
7 votes
2 answers
1k views

Simplest way to reduce low frequency noise from windows

Could you please advise the simplest method to reduce low frequency noise from windows? The problem: Somewhere outside there is a source of noise with frequency of 166 Hz. I can’t neither find nor ...
Damir Tenishev's user avatar
1 vote
1 answer
391 views

Confusion over textbook formulae for directional characteristics of sound sources

I'm currently reading Olson's Elements of Acoustical Engineering, in which formulae are given for the directional characteristics of various arrays of sound sources, all of which are stated in terms ...
apk's user avatar
  • 13
2 votes
1 answer
75 views

What is the mechano-acoustic effect of off-centering the black paste on tabla-drum skins?

Tabla is a musical instrument composed of two drums, the Bayan (left on picture) and the Dayan (right on picture). A unique feature of the tabla is the tuning [black] paste called the gab, applied to ...
Noil's user avatar
  • 182
0 votes
3 answers
182 views

Can two microphones placed within centimeter distance together measure a distance of the sound source?

I have placed two microphones placed within 1 or 2 cm distance. They can receive and record sounds around them. I want to detect the distance of the sound source (specially human voice) and the ...
Sazzad Hissain Khan's user avatar
0 votes
1 answer
32 views

IC engine Exhaust gases flow simulation through absorption type muffler [closed]

How is the exhaust gas flow through the absorption type muffler. I am interested to know how the exhaust gases enter the absorption material(fiber glass) before leaving through the end pipe. What ...
Sonali Pansare's user avatar
1 vote
2 answers
198 views

How do I remove outliers in measured sound pressure levels data?

I have measured sound pressure levels (24 h sampling at 25600 Hz) data for many days. The focus of measurements was on road noise, which is a dominant source of noise in the measurement setting. ...
khajlk's user avatar
  • 145
0 votes
3 answers
112 views

Respirator mask that transmits sound waves

If one had to design a respirator that would have the minimal sound distortion, and allow to communicate normally (one-on-one at least), how would one do it? I wear powered respirators (PAPR) and ...
runcyclexcski's user avatar
2 votes
2 answers
217 views

How to convert the velocity field to a pressure field for obtaining the sound level?

I am studying jet mixing noise and I am given a velocity field, with $V_x$, $V_y$, $V_z$ in the Cartesian coordinates. I wanted to know if there is a method by which I could find some information ...
fidafa123's user avatar
0 votes
0 answers
2k views

How to use Spectroid app to measure low frequency vibrations?

I need to measure how low frequency (vibration) changes when going through different materials. The only possible way I found is by using Spectroid app. However, I have no idea of what settings to set ...
NightRider's user avatar
4 votes
2 answers
233 views

Why does the frequency of a bottle filling up changes?

Today as I was filling up a bottle of water, and I could hear the distinctive change in pitch that signals that the bottle is near filling up, I started wondering what equation determines the ...
NMech's user avatar
  • 24.4k