Questions tagged [sound]
The sound tag has no usage guidance.
274
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Testing CNN model using sound generated from pyroomacoustics room simulation
I have generated a large set of audio using Pyroomacoustics for room simulation, employing a circular microphone array and a single sound source.
I have successfully trained and tested a CRNN (...
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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 ...
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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 ...
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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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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 ...
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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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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 ...
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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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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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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 ...
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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.
...
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What does Fast and Slow Time Weighting signify for real-time audio signal processing?
I have a streaming audio signal that I am recording in real time. To make the explanation easy, say the signal that I receive is calibrated and has a sampling frequency, $F_s = 44100\textrm{ Hz}$.
I ...
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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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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 ...
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Proof-of-concept for active noise cancellation to block consistent low-frequency HVAC noise transmission
Background
We live in a multi-unit building where each unit's HVAC system/closet is located directly across a party-wall from the neighboring unit's bedroom, and adjacent to a shared external curtain ...
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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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Does a .wav file created from a .mp3 file have better quality than the .mp3 file itself?
A .wav file created from a .mp3 file has the same frequency domain plot as the mp3 file itself https://stackoverflow.com/questions/58706674/difference-between-frequency-domain-in-mp3-and-wav.
However,...
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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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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 (...
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Audio time stretching, without pitch shifting
This might be a Sound Design question, or a StackOverflow question since I am attempting to do this with Java.
I would like to play back a sound at the same pitch, but stretched out in time.
My ...
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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 ...
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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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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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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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How to compute dBFS?
I asked myself how to compute dBFS (dB full scale) from a value of sample between 1 and -1?
and in general?
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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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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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GCC-PHAT cross correlation
I am trying to implement GCC-PHAT in python.
The approach is similar to the following two links:
link1 and link2
It seems the only difference between GCC-PHAT and normal cross-correlation using FFT ...
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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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How to use the iircomb filter in matlab
I have a sound file that needs filtering which looks like this:
Hence I think that I have noise spaced equally at 832Hz. i tried to use the iircomb filter taken from mathworks website and i managed ...
CommunityBot
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How do I know what is causing the noise in my signal
I have a noisy audio file, available here (It is safe to download if you wish to)
https://ufile.io/pstrt
Now, I inspect it in matlab:
And then i plot it on normalised frequency:
Now I need to ...
CommunityBot
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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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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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Creating 2D array to play audio in left and right channel in matlab
I'm new to matlab sound processing and I am trying to create a 2D array for the sound code below. I have to make the sound have 400 samples(i.e 10ms) at 20hz, but having trouble getting the code to ...
CommunityBot
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How to convert multi-band Energy Time Curve (ETC) to Impulse Response (IR)?
I am running my own sound simulator. Now I have obtained the Energy Time Curve (ETC, expressed by energy) by physical simulation, and they are stored in 8 discrete frequency bands (because decay of ...
CommunityBot
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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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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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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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How does Siri recognize me saying "Hey Siri"?
I am trying to understand how my iPhone can continually listening for me saying Hey Siri, Alexa, ...
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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 ...
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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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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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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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Why should one use windowing functions for FFT?
So I just revised my pitch calculation algorithm using a harmonic product spectrum algorithm. I was just curious about why this explanation of Harmonic Product Spectrum states that you need to ...
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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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Signals cross-correlation
I am trying to measure phase difference between two received waves which are recorded by two separate PC's (microphones). The two PC's starts recording at the same time, then I make a sine wave sound ...
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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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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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How to transform SoundWave Picture to sound?
I would like to recreate a sound from a picture of a soundwave.
But i see a lot of theorical question.
And im not sure its possible....
I mean, it is possible to create a sound...
But to make ...
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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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