Questions tagged [sound]
The sound tag has no usage guidance.
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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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What's spectral "tilt"?
I am looking at article Speech-in-noise intelligibility improvement based on spectral shaping and dynamic range compression. In paragraph 2.2 the article mentions "tilt" of the spectral envelope. The ...
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Calculating Phase Response for 2 microphones given the input
I want to measure and compare the phase response of two identical microphones. To do this, I have a pressure chamber, which allows to apply the same pressure to both microphones.
I apply a sweeped ...
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identification of sounds within audio signals
I am looking for methods to identify sounds within audio files. I was hoping to find some ready-made user-friendly software to do this but haven't found it yet. I am familiar with Matlab and some C++...
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PortAudio: sound fade in/out by scaling sample data
I've done already some fade in or fade out effect in portaudio, but that is not working properly.
My callback function:
...
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Peak detection for signals that contain high frequencies
I have an question about peak detection. My purpose is creating a plot with an impulse response and the decay line at / above it.
What I see till now is that there are two options for finding peaks:
...
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Can you apply an audio filter/effect to only part of an audio signal and not get audio glitches?
I'm entertaining the idea of making a music-creating application. I'm a total newb at signal processing. The question that concerns me most right now is, if I apply a filter/effect such as convolution,...
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1/f noise generation
Recently I was reading a paper about the pink noise generation. But I don't have any background of this field.
I am confused with some part in the paper.
First, the Voss's algorithm generated a ...
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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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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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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 ...
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Alone MFCC can identify difference between sound?
I am doing a project to identify different drum beats. There are lots of features like MFCC, Chroma Values, Spectral Bandwidth, Spectral Centroid, Zero Crossing Rate, etc. But most of the projects are ...
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What can I do to improve quality of sound recording?
I have an issue with a sound recording I made with my Olympus LS-12.
The recorder is recording a constant unknown sound at about 10kHz. The sound is visible in the sonagram below as a faint dark ...
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Difference between note based (MIDI) and sampled (FLAC, MP3, etc.) audio formats
I (somewhat) understand sampling and sampled formats, and their relation to the original (analog) signal, but do not quite relate it to note based (MIDI) formats.
What actually is a note based audio ...
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Using K-Space Filtering to Filter by Speed
I want to read waves with an electret consender microphone that are slower than the speed of sound, and I figure it would make those waves easier to identify if I could process out all waves moving ...
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amplitude compensation after filtering and mixing audio
I am working on a mixer which lets me mix dry and wet signal in a user defined ratio. Wet signal is basically just the all pass filtered signal. The mixing takes place in frequency domain and so does ...
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How to process the .wav file to get meaningful information like the number of inhales/exhales
The plot of the data from the wav file.
Link to the sound file - https://drive.google.com/open?id=0BxAPlY66uX7qWWtDZUw3WkpjSGs&authuser=0
Also the FFT plot is like this
I am new to the field of ...
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How to add bandpass filter to recorded sound in matlab
I have a sound that is being recorded but I am trying to apply bandpass filtering to the sound so that it filters out anything above and below a selected frequency range. I have tried the tool in ...
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How to synchronise two audio files using a marker
I'm working on a project on which we use WebRTC and the RecordRTC library to record audio files.
I would like to be able to process the audio files server-side to ensure a good synchronisation.
To ...
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Length of frames for calculating cepstral coefficients
For audio classification we are using the cepstral coefficients and their derivatives. Which I calculate using the Matlab libary voicebox.
I am looking for some literature for how to choose the frame ...
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How to convert a sound file to any other data format which can be manipulated
I know this is very basic question and i am new to this site. But can anybody help me with my question. How to convert a sound file to other data format say using some type of transform (FFT or DFT) ...
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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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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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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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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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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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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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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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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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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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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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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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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 ...
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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 ...
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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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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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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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How to convert from .wav (hydrophone data) to pressure (SPL)?
I am new here, since I started recently with signal processing. I am trying to analyze a .wav file recorded by a hydrophone, however, I need to convert it to SPL. I have a calibration file which ...
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How to Synchronize multiple real time audio streams before mixing them?
I have been working on a VoIP solution in which I have to mix multiple audio streams coming from various sources. I have been facing muffled sound after the mixing of streams. I have implemented ASW ...
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need help cleaning a sound sample from a constant (stationary) background noise
I have been recording sound sample from mouse vocalisations and noticed that a background noise appeared in the recording room. the noise is clearly visible in the spectrograms of the recordings as ...
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When we play several audio streams what is responsible for mixing them?
When we play several audio streams what is responsible for mixing them in single audio playing via speakers?
Clearly it should be either OS combining the sounds or hardware getting multiple data ...
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White noise sound vs harmonic sound reverb
I use a microphone array to localise a sound source in a small lecture theatre.
I tested it with white noise and a bird noise source. I found out that the white noise source give very good results. ...
Minh Nguyen
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Getting sound pressure level (SPL) for a frequency band from Welch's derived PSD
I'm using Welch's method (pwelch, in octave) to get the PSD of a recorded sound signal (i.e. pressure level vs. time). I then took the PSD data and took the sum of the amplitude in each octave band (1/...
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Adding sine waves
I need to play thousands of simple sounds (generated tones) at the same time. If I am understand correctly there should be a way to add them together in complex wave but i really can't see the light ...
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Inter aural time difference generation using sine waves
I have a stereo sound for Inter aural time difference consisting of sine wave(16 samples as 16 bit PCM Data) for left and right audio. From time to time I would like to advance either the left or ...
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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 ...
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Effect of frequency shift on a sound signal
I had two sound files and did the following to it:
...
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