Questions tagged [sound]

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2 votes
1 answer
152 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 ...
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2 votes
1 answer
53 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 ...
  • 21
3 votes
2 answers
91 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 ...
  • 521
1 vote
1 answer
55 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 &...
  • 21
12 votes
2 answers
2k 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 ...
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3 votes
0 answers
55 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 ...
  • 131
0 votes
0 answers
22 views

Seeking expert on Android Dynamics Processing Effect for designing simple hearing amplifier [duplicate]

I am looking for someone who understand or has prior experience with Android Dynamic Processing Effect, to design a low-latency, frequency gain amplifier. Some public links for this Android feature ...
0 votes
0 answers
25 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 ...
3 votes
1 answer
174 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 ...
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4 votes
2 answers
285 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 ...
  • 57
1 vote
1 answer
38 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 ...
0 votes
0 answers
53 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 ...
0 votes
0 answers
14 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 ...
  • 1
0 votes
0 answers
197 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 ...
  • 101
0 votes
3 answers
125 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 ...
0 votes
1 answer
75 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, ...
  • 91
0 votes
0 answers
45 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 ...
  • 101
0 votes
2 answers
48 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 ...
  • 11
10 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 ...
0 votes
0 answers
186 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 ...
0 votes
1 answer
33 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 ...
  • 9
0 votes
1 answer
48 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 ...
  • 103
0 votes
1 answer
142 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-...
  • 91
1 vote
1 answer
53 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 ...
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1 vote
0 answers
19 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 ...
  • 11
0 votes
0 answers
62 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 ...
1 vote
1 answer
86 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 &...
0 votes
1 answer
174 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 ...
  • 701
0 votes
0 answers
52 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 ...
8 votes
4 answers
4k 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 ...
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 ...
0 votes
1 answer
320 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 ...
0 votes
1 answer
149 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?
4 votes
3 answers
2k 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 ...
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0 votes
1 answer
40 views

Does speech volume affect frequencies?

I have created a little classifier that listens for certain keywords. Sometimes it will not react to a keyword, but if I shout the word, then the classifier will be able to pick it up. The classifier ...
  • 101
1 vote
1 answer
36 views

Why can't the callee whom I am on call with hear the sound coming from my phone's speaker but I can while my phone is on loud speaker?

I was on call with my friend and have put the phone on loud speaker and I opened youtube,The sound was audible to me but not to my friend. How is it even possible when he can hear my voice but not the ...
1 vote
2 answers
258 views

Multiple peaks in a same signal?

I am working on peak detection in different signals, the signal plot looks like this: After applying peak detection algorithm and tuning it for each signal, final output looks like this: As you can ...
1 vote
1 answer
314 views

Which codec and format are Audible downloads?

Files downloaded with the Audible Download Manager are stored with the .aax file extension, but the information I can find about this format seem to vary. Regarding this source, the files are stored ...
1 vote
0 answers
12 views

Sound feature extraction too brief in comparison with manual annotation of sound. How to combine them?

Sound characteristics (features) are taken per e.g. 20 ms, but manual annotation takes place in durations of seconds. If we want to use these characteristics along with labels, how can this be ...
0 votes
0 answers
71 views

Sound of (sea) waves imitation

I need to create an algorithm for sound of waves. So I imagine it should be a white noise with doppler effect. However I understand doppler is just change of frequency. But white noise have all the ...
0 votes
2 answers
78 views

Working with a sound's magnitude instead of amplitude

I'm working on a project, where we're recording sound with a piezo-disc which looks a little something like this: Now, unless we're doing something horribly horribly wrong, I've discovered that we're ...
0 votes
1 answer
51 views

Why does toning up a piano make it sound similar to that a string instrument

I have a .wav file of a piano being played at 220 hertz. When I tone this up to 880 hertz, it begins to sound "stringy". However, if I were to use the piano plugin in fl studio and play it ...
  • 3
0 votes
2 answers
81 views

What do troughs represent in a sound wave?

What's the notion of negative amplitude? I hope the title and the question don't mean different things.
0 votes
0 answers
28 views

Calculate the percentage of accuracy with which user made the assigned sound

I want to design a web-app for my cousin who is 2 years of age in which i have implemented a functionality in which when an image is clicked some sound gets played and the user has to make the same ...
  • 1
0 votes
0 answers
184 views

Normalize two or more sound signals in order to let them with the same duration time and amplitude

I am very new in signal processing area and I am trying to solve the task in order to make an experiment with audio files from different languages, so, I am trying to let some ogg audio files with the ...
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4 votes
4 answers
335 views

How to determine precision needed for sin approximation used for sound synthesis?

I am doing some procedural sound synthesis in Java. I want to have a sine wave as one of the possible basic sounds. When experimenting with that, I have found the default Java ...
  • 141
1 vote
3 answers
65 views

How does voice affect a sound wave or its corresponding waveform?

Someone in the physics stack exchange told me to come here for this question. My question is how does a person's voice affect how a soundwave looks? For example, if I say the letter "a" it ...
  • 11
0 votes
0 answers
86 views

MATLAB- Add Envelope to Sound Signal

I’m in the process of making a convolution reverb and I’m trying to add an envelope to my impulse response signal and plot it in order to change the RT60 of my sound signal (Just a song). I’ve looked ...
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1 vote
1 answer
75 views

How do I generate sound using Python3?

I am totally a newbie in signal processing. I want to generate and play sound for frequencies (1/3 octave band center frequency) 125 Hz, 250 Hz and 500 Hz respectively, each for 30 seconds and with ...
  • 113
0 votes
0 answers
56 views

What cause frequency change of the acoustic signal (3 kHz to 10 kHz)?

I am working on Acoustic Resonace testing in which I excite the sample and then record the sound (3 kHz to 10 kHz) by microphones. I do few times repetation of the same measurement in series (one ...

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