Questions tagged [sound]
The sound tag has no usage guidance.
276
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How can one design earplugs so that they provide protection from loud noises, such as explosions or gunfire, while still allowing user to hear voices?
I read on https://www.johnfoy.com/faqs/whats-wrong-with-3m-companys-dual-ended-combat-arms-earplugs-version-2-caev2 (mirror):
One side of the earplugs acted provided protection from loud noises, such ...
2
votes
1
answer
73
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DOA beam pattern for circular array
Based on the tutorial for a linear array here, I've written the following code for a 6 microphone circular array. The array has a radius of 5cm. A beam pattern is generated but it doesn't look right ...
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2
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2
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Is it possible to design a wearable device with a noise reduction ratio (NRR) larger than 36 dB?
Wearing both ear muffs (whether passive or active) and earplugs simultaneously can't yield more than 36 dB noise reduction ratio (NRR), because:
it does not prevent the sound to reach your inner ear ...
0
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1
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114
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How to play sound at specific location (horizontal/azimuth) using wav and python ? without libraries
how to set sound location left/right (in mono audio) and azimuth (up/down) of the wave? I know there are a lot of different libraries doing that, but I'm interested in some minimal examples to ...
0
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1
answer
63
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Sound having lower rms values but higher loudness.What are the possible reasons?
I have some noise datas which are having lower RMS values. But don't know why they are very loud when I am normalizing and playing them. After normalizing the audio remain still low rms values. But ...
0
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1
answer
71
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What types of sound attenuation do exist?
Sound attenuation can occur due to various phenomena. The most known are
Distance: For a point source the sound pressure decreases by 6dB with each doubling of the distance to the sound source.
...
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0
votes
1
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106
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What kind of distortion effect is this?
Here is the image of a plugin distortion I have applied to a sine wave.
The sound characteristic is heavily distorted and digital but still good sounding bass wave.
Any ideas what kind of distortion ...
- 111
1
vote
0
answers
39
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Collecting average frequency data of a song/audio recording
I'm a university student, and for one of our classes we have to use TouchDesigner to make some sort of dynamic visualizers. I know how to do this already, but to make the process more scientific I ...
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0
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38
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Analytical Solution of Sound Wave Propagation in Moving Medium (1-D Problem)
I am trying to use frequency-wavenumber analysis to estimate sound wave propagation in a moving medium (fluid). I need to test the technique on analytical data. I wonder if there is an analytical ...
user67390
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0
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22
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Independent Sound Generative Factors
I am currently in the process of exploring independent sound-generating factors (e.g., Timbre, Pitch, Amplitude, Spacialization, Effects, Instrumentation, etc.) and I'm totally new to this enterprise ...
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3
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1
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72
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What effect causes this Pattern?
I've conducted a measurement of underwater noise in a laboratory experiment.
Therefore i am using a sweep signal.
Sometimes -I guess when the signal is much more louder- I get this fascinating ...
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2
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1
answer
468
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Is it possible to calculate DRR (Direct Reverberant Ratio) from an Room Impulse Response? If not, how is this parameter calculated?
DRR (Direct-to-Reverberant Ratio) and Reverberation time (T60) are said to be two of the most important characteristics of sound in Reverberation. DRR is said to be ratio of the energies of the direct ...
1
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1
answer
354
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How to calculate the reverberation time RT60 given dimensions of a room?
I'm trying to estimate RT60 based on reverberant sound. In order to generate reverberant sound, I am required to give dimensions of a room so that RIR is generated and is convolved with clean sound.
...
0
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0
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77
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Is it possible to work with DSD audio on MATLAB?
Just for starters: I am very new to audio processing
I was looking for audio data that is in 1-bit format and I stumbled upon DSD. From what I was able to read it is old but kind of controversial ...
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1
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396
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How to export raw audio from audacity?
Request to Experts:
I am a DSP novice. I would like to generate a tone in audacity and export it as a raw file (without headers), then process it using simple C/Java file handling programs (without ...
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4
answers
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What are possible reasons a sound may be continually clicking (low amplitude, no sudden changes in amplitude)
I am making a digital sound mixer and get this wav file (200kb, Wetransfer)
I looked through the waveform using Audacity. It uses 20% of its maximum amplitude and I see no sudden changes in the ...
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votes
2
answers
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Why isn't silence just zeroes in an audio file, and how can I make it?
I'm completely new to the world of audio and signals. I noticed that when I opened Audacity and generated one second of silence (details below) and converted the raw WAVE file to a list of integers, ...
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2
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1
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375
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Synthesizing piano
The sound of the piano is something very complex. There are various elements to consider such as action, hammer, soundboard, sympathetic resonance, tuning age and even room reverb.
Some companies (...
0
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0
answers
99
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How to generate a sound closer to a saxophone using sinusoids after Fourier Transform?
Generate a sound wave of saxophone frequency and compare it to the original sound clip and play both to listen to if there is a good match.
I am trying to generate a sound closer to a saxophone using ...
2
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1
answer
1k
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How to detect direction of sound using four microphones?
I have a box with four microphones on its sides: one on top, one on front and two on left and right sides.
Is it possible to calculate a vector from the center of the box to the source of sound in ...
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1
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186
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How to add time weight in SPL operation
SPL will be calculated as described below:
collect $N$ samples
do FFT for the $N$ samples collected: the signal is now in the frequency domain.
get magnitude of the FFT
get RMS value of the FFT
apply ...
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3
votes
2
answers
705
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Why is the reference pressure for dB SPL 20uPa?
The article here says that
This 20-micropascal reference was selected because it was the quietest
sound pressure level that a group of normal hearing test subjects
could detect.
which makes me think ...
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1
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1
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90
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Is the magnitude of the phase shift independent of the volume of the sound?
Sound waves can cause vibration of the particles/objects that are scattering/reflecting/emitting the light. Since vibration is spatial displacement, it causes a phase shift by affecting the value of &...
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2
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What is the maximum possible frequency of human voice/speech(That can be generated through human vocal cords)?
Human hearing range is commonly known to be 20 Hz to 20 KHz
But what about speaking range? We know that speech Sounds are generated through our vocal cords. So What is the maximum value of frequency ...
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143
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Pop and buzz noises caused by the signal process
There is a measurement called waterfall effect in audio systems.
When you apply a sweep signal starting from 50Hz to 20KHz, it shows how long the resonance of the speaker goes. For example in the ...
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0
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30
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What can I do to improve the sound of a signal?
I want to improve the sound of my signal, I know I can do it by increasing or decreasing the amplitude of the signal itself. Are there any other ways to do this? How can I apply the Fourier transform ...
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votes
1
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448
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Best method to measure phase difference between acoustic recordings of sine wave?
I am using multiple digital MEMS microphones in an array which are 8mm apart. Now I recorded a sine wave of 20kHz for calibration (at angle 0°) and want to measure the phase difference over time ...
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4
votes
2
answers
491
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How are sounds recorded and reproduced (played back)?
Someday I have suddenly got wondered how sounds are recorded and reproduced. I searched a little bit but the information I got was composed of difficult words and contents, so I couldn't understand ...
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1
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63
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How to normalise 3D time-frequency sound intensity vector
I've got a 3D time-frequency sound intensity vector that I've derived from Ambisonic b-format signals. W acts as the sound pressure ...
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0
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138
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RT 60 from Impulse response
I have already the impulse response of an acoustic environment in the form of a series of signals over 300 samples. I have tried the procedure given in this platform - i.e. low pass filtering, Hilbert ...
0
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0
answers
19
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Trim syllable audio recording to only the vowel
For a Chinese learning app, we let users record a syllable and we use speech recognition to assess if the pronunciation was correct or not.
Every Chinese syllable can be pronounced with different ...
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0
votes
0
answers
223
views
Can I do a microphone sound pressure level calibration for low signals, using a dB signal comparison of a reference signal?
I am analyzing the spectrum of low-level signals and try to calibrate the system, to get the correct dBSPL levels in the results.
The only sound pressure level calibrator I have at hand generates a ...
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3
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195
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Why, for a musical instrument, the first harmonic has more power than the fundamental and last longer?
In analyzing the audio recording of a string instrument, I am struggling with pitch estimation. I am using the pYIN algorithm and every pitch estimation I'm obtaining is off by one octave. I assume ...
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1
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368
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Convert A frequency weight to Z frequency weight
I want to get the SPL of a monotonic sound like a 1khz tone but the problem is that I have a SPL meter which gives data in terms of A frequency weight. Is it possible to get the SPL of a 1khz signal, ...
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0
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52
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How to convert iPhone 12 raw audio to sound pressure level?
I have 'raw' audio files recorded from an iPhone 12 Pro Max. I'd like to convert the raw 16 bit .wav amplitude to SPL. It's been a while since I was doing this kind of stuff hands-on and I was never ...
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2
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Increase SNR by using only the first 200 samples
I am making an experiment using sound source and microphones. I use metronome as the sound source, so I can consider it as impulse sound. I placed the microphones at different places about 1 meter ...
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11
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2
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Does the Nyquist frequency of the cochlear nerve impose the fundamental limit on human hearing?
The bandwidth of human hearing by empirical data is $20 \; Hz$ to $20 \; kHz$. A cochlear implant stimulates the auditory or acoustic or Cochlear nerve directly so that the hearing can be improved in ...
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0
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649
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Read microphones connected to 4x1 USB Hub using Python
I'm working on a sound source localization project which needs an array of microphones. I have 4 microphones with an Audio Jack plug which is connected to a USB Audio adapter. Last I use a 4x1 USB Hub ...
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1
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Speed of car with sound [closed]
I've got this task:
A traffic policeman standing on the highway notices a change in tone of exactly one major third (f2/f1 = 4/5).
What speed can he infer? Speed of sound c = 340 m/s
I've got this ...
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0
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1
answer
121
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Playing sounds with only one frequency at a time
We have a "speaker", that can make a single frequency at a time (0 - 130k Hz). So we can play a tune by making it play a tone for 1 sec and then the next tone for 0.5 sec etc. We can change ...
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545
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how to convert SPL in dBA to dB
I wonder how I can convert dBA (A weighted) to dB and vice versa.
can anybody provide any kind of table or online conversion app?
thanks
following formula comes from https://en.wikipedia.org/wiki/A-...
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Is sound affected by wind force?
Suppose wind direction is from point A to point B and some sound source like glass shattering is at point B, will sound waves going to point A be affected by that wind coming in opposite direction, or ...
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0
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The best method to convert piano sound to music notes in real time [duplicate]
I was looking for a way to convert piano sounds to piano notes for my research. I discovered the conversion of piano sound to piano notes using FFT and piano note recognition using CQT. I am also a ...
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0
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What mathematical function could be used to simulate this sound effect?
I have this sound effect which by the way if anyone could give me its name, I would really appreciate it. And after loading it into matlab/octave (don't worry this isn't a programming question) using ...
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1
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Timbre vs sound via oscilloscope
My understanding is that a distinct sound will generate waves of identical amplitude and frequency, but that most things (such as people's voices, music intsruments, etc) produce multiple distinct &...
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1
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302
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Male and female voice spectrum
I have a set of data which consists of male and female voices. They are pronunciation of a same sentence. What's the appropriate method for getting an average spectrum for the male and female voices ...
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0
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68
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Prevent clicking noises during chirp generation
I am trying to generate a tonal sound which changes in frequency and amplitude over time. The goal is to emulate an engine order during driving. So I don't know the frequencies and the amplitudes ...
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5
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How can I upsample 22 kHz speech audio recording to 44 kHz, maybe using AI?
I have a 22 kHz mono audio recording, which is mainly speech, a reading. I would like to upsample somehow to 44 kHz, to improve the audible quality. I have read about there are AI methods for ...
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3k
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what does %matplotlib inline mean? [closed]
so i have this lab in coursera course, well i tried first at Linux terminal at the first command %matplotlib inline, it doesn't work :
( bash: fg :%matplotlib no such job ), even if I apply it like ...
0
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1
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758
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Why is fourier analysis used in doppler effect?
I am a high school student that carried out the experiment on the Doppler effect to therefore analyze the graph but after doing some research, I saw one of the articles saying “ Fourier analysis is a ...
