Questions tagged [sound]

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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 ...
Franck Dernoncourt's user avatar
0 votes
1 answer
90 views

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 ...
tempdeltavalue's user avatar
0 votes
1 answer
50 views

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 ...
Bisnu Sarkar's user avatar
0 votes
1 answer
65 views

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. ...
MrRabbit's user avatar
0 votes
1 answer
96 views

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 ...
TiagoLr's user avatar
  • 111
1 vote
0 answers
36 views

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 ...
Hugh Mungus's user avatar
1 vote
0 answers
36 views

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 ...
Engineer's user avatar
  • 173
0 votes
0 answers
22 views

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 ...
Yusuf's user avatar
  • 1
3 votes
1 answer
71 views

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 ...
hoaratius's user avatar
2 votes
1 answer
308 views

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 ...
Murali Kadambi's user avatar
1 vote
1 answer
307 views

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. ...
Murali Kadambi's user avatar
0 votes
0 answers
58 views

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 ...
Sahil Sharma's user avatar
0 votes
0 answers
26 views

Advantages of the Karplus algorithm for sound synthesis

For a personal project I am trying to make a software to synthesize plucked and hammered string instruments. This is a whole research topic and there are already some models and algorithms such as the ...
Agustín's user avatar
3 votes
4 answers
1k views

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 ...
Bernd Elkemann's user avatar
6 votes
2 answers
5k views

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, ...
Patrick O'Brien's user avatar
2 votes
1 answer
345 views

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 (...
Alessandro Costantino's user avatar
0 votes
0 answers
89 views

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 ...
Adrian Surani's user avatar
2 votes
1 answer
897 views

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 ...
Robotex's user avatar
  • 121
2 votes
1 answer
134 views

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 ...
iklee's user avatar
  • 21
3 votes
2 answers
574 views

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 ...
user13267's user avatar
  • 533
1 vote
1 answer
85 views

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 &...
Kevin's user avatar
  • 19
12 votes
2 answers
7k views

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 ...
DSP_CS's user avatar
  • 1,910
3 votes
0 answers
122 views

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 ...
Alper91's user avatar
  • 131
0 votes
0 answers
29 views

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 ...
Luca Leone's user avatar
3 votes
1 answer
366 views

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 ...
nik124's user avatar
  • 33
4 votes
2 answers
446 views

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 ...
Doohyeon Won's user avatar
1 vote
1 answer
58 views

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 ...
Molem7b5's user avatar
0 votes
0 answers
133 views

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 ...
Sajaad Boodoo's user avatar
0 votes
0 answers
18 views

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 ...
Paul's user avatar
  • 1
0 votes
0 answers
215 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 ...
Flovdis's user avatar
  • 101
1 vote
3 answers
184 views

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 ...
HyperToken's user avatar
0 votes
1 answer
290 views

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, ...
SeAlGhz's user avatar
  • 91
0 votes
0 answers
50 views

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 ...
Evan's user avatar
  • 101
0 votes
2 answers
58 views

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 ...
Semar's user avatar
  • 11
11 votes
2 answers
2k views

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 ...
kbakshi314's user avatar
0 votes
0 answers
563 views

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 ...
Tarlan Ahad's user avatar
0 votes
1 answer
35 views

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 ...
ginxma's user avatar
  • 9
0 votes
1 answer
95 views

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 ...
DrDress's user avatar
  • 103
0 votes
1 answer
432 views

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-...
SeAlGhz's user avatar
  • 91
1 vote
1 answer
62 views

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 ...
Saad's user avatar
  • 13
1 vote
0 answers
20 views

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 ...
Tae's user avatar
  • 11
0 votes
0 answers
65 views

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 ...
david david's user avatar
1 vote
1 answer
108 views

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 &...
hotmeatballsoup's user avatar
0 votes
1 answer
287 views

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 ...
S.H.W's user avatar
  • 726
0 votes
0 answers
66 views

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 ...
Matthias La's user avatar
8 votes
5 answers
6k views

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 ...
Konstantin's user avatar
0 votes
1 answer
3k views

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 ...
sumer fattoum's user avatar
0 votes
1 answer
675 views

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 ...
General MO7's user avatar
0 votes
1 answer
294 views

How is $-6$ dB pressure amplitude is the same as FWHM?

I keep reading many literature, and in most cases $-6$ dB is referenced as the full width at half maximum (FWHM). Mathematically, how is that possible from the definition of dB?
Katherin Romanova's user avatar
4 votes
3 answers
5k views

FFT of a AM modulated signal

I am generating an AM modulated sinusoidal wave. The carrier frequency is set at $1000 \ \rm Hz$; the modulation frequency is set to $40 \ \rm Hz$ and $100 \%$ of the amplitude is modulated. I ...
Mathieu's user avatar
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