Questions tagged [audio]
Audio, or in terms of signal processing, an audio signal is an analog or digital representation of sound, typically as an electrical voltage.
1,139
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Compare two audio signals for its content, not about pitch,frequency
I have two audio samples, one is an audio clip "where are you" ripped from a movie, I want to compare it with another audio sample which I generated using pyttsx ie text to speech which sounds ...
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1answer
23 views
Phase response in a filter for an Audio Application
Should I be concerned with the group phase delay which a filter produces? Especially in an audio application? Should I aim at using a linear phase delay filter for example?
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4answers
242 views
What Are The Semantics Of Wav-File Sample Values?
The title is the question. To make this concrete, assume I have a standard 16-bit single channel wav file, with (although it doesn't matter) a 16000 Hz sampling rate.
Each sample magnitude will be a ...
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2answers
33 views
Sine wave amplitude modulation - Analysis using Audacity
I am trying amplitude modulation in C++ on a sine wave which is a 1000 Hz sine wave sampled at 48000 Hz. The original sine wave is like this (In Audacity) -
When I basically double the amplitude for ...
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3answers
1k views
How do impulse response guitar amp simulators work?
I am wondering how impulse response guitar amp simulators/modelers work. I thought it was a matter of convolving a signal of recorded impulse response in time-space with a guitar sample.
I tried to ...
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0answers
20 views
Problem in generating Sine wave tone using AIC23 codec of DSP Kit TMS320C6713
We are trying to observe a sine wave output from the Line Out Port of the AIC23 codec module in our DSP Kit 6713. We have used the following code in order to generate it, but we are facing errors ...
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4answers
60 views
concatenating short noise sequences
I'm trying to merge 2 identical audio files. The Audio file is nothing more than white noise generated using MATLAB commands
...
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0answers
15 views
Why can I not record ambisonics in Unity with Google Resonance?
I've set up Unity (2018.4.0f1 LTS) with the Google Resonance project and I'm attempting to record an ambisonic environment with the Resonance Audio Listener component - however on hitting Record, ...
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22 views
How to understand the sound parameters so that it can be reproduced in Matlab
I am reading a paper called "Mouse Auditory Brainstem Response Testing".
In order to make the experiment myself I would like to create the stimulus sound using matlab.
When describing the sound (in ...
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0answers
29 views
FFT frequency-magnitude not correct when a positive gain EQ point is applied
I have a measurement system, which applies a log sine sweep as stimulus to a DUT and records the return signal.
I then extract the impulse response, and perform an FFT on this to examing phase and ...
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0answers
35 views
What is the exact compression that is happening from the first sequence of raw audio waveform data to the second sequence?
The first sequence of audio samples is recorded in JavaScript from the browser in mono, PCM format, 32-bit, and 96,000 Hz.
I wrote this audio file as a blob to a server through a JavaScript FormData ...
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0answers
15 views
Digital signal processing how audio wave and function chage with respect to each other
If an audio signal is f(t) and if i play same audio with 2× speed then what will function of 2× speed signal f(2t) or f(t/2) and why?
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14 views
Is there a way to filter out low volume content in an audio sample?
Imagine you are listening to a digital file that contains some random speech.
Now, while you are listening to it, you also hear in the background (spatially) some low volume content, either noise, ...
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4answers
817 views
Noise reduction using multiple recordings of the same signal
I have two (audio) recordings of one analog signal, I used two separate devices (smart-phones) recording from two different locations.
Each recording device is pretty crappy, lot's of electrical hum ...
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1answer
41 views
How to synchronize audio and video streaming for not fixed FPS streaming?
It's a 3-stage process.
In the first stage, a video (with audio) is recorded at a fixed 25 FPS rate. In the second stage, it's demuxed in two different channels and the video is processed. In the ...
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1answer
44 views
Feature Extraction of Insect Sounds
First of all, forgive me if I sound stupid. I am still learning Audio Processing.
So I am trying to make a machine learning model for detecting a specific insect through sound.
Here is a sample raw ...
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1answer
18 views
Generating spectrogram for band-pass filtered wav file python
I have some .wav files of heart sounds. I want to apply band-pass filter [20Hx 100 Hz]. Then generating PCG images size of 560x420 pixels and RGB format. How could i do this?
Any help will be highly ...
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22 views
Using a Multirate FFT system to analyse audio
I am trying to implement a multirate fft system to try and achieve frequency windowed analysis of audio.
Say I have managed to get an impulse response of a system. This impulse may be say one ...
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0answers
16 views
Is it possible to restore audio that has been tonally modified by a phase vocoder?
My objective is to apply some process to the modified audio that allows me to obtain the original audio. I think it can be solved through machine learning techniques. I don't know if there is any ...
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2answers
68 views
how to remove noise from heart sounds?
i have .wav files acquired through putting android cell phone MIC directly on chest of person.For feature extraction, i have to made them noise free. These recordings were taken in rooms with no noise ...
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0answers
24 views
Finding frequencies(and bandwidth) that works best audio in a certain medium
Complete DSP and coding newbie(learning python). I am trying to find frequencies that can pass through well in a musical instrument tube. I am trying to find audio frequencies(audible and inaudible ...
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3answers
186 views
Low-Pass Filtering on Small Chunks of Audio
I've got a script (Python) that chops 44.1 kHz realtime audio into 10 ms chunks, processes each chunk, and stitches the chunks back together with no added artifacts. I'm trying to create a low-pass ...
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1answer
38 views
Cone of Confusion
In sound perception, humans adapt by tilting the head or relying on other location cues such as visual input when the source of the sound lies on the cone of confusion. On this cone, no time and level ...
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1answer
37 views
What determines peaks in FFT?
I ran FFT on three audio files and found that the results for some have more peaks than the other. Could anyone give me any conceptual explanation as to what determines these peaks? Below are plots of ...
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2answers
59 views
Parallel equalizer, working for boosts but not cuts
I am trying to replicate the behaviour of a parallel equalizer.
The approach is to use a parallel sum of bandpass filters like so:
$Response = 1 + bandpass1 * (gain1 - 1) + bandpass2 * (gain2 - 1) + ...
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0answers
15 views
Hardware that Mixes Two Digital Audio Source into One
Is there any off-the-shelf hardware that extracts two digital audio streaming source from two digital audio stream(like USB+SPDIF), mixes, and transmits in single digital stream real-time(if the ...
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0answers
16 views
How to use DTW for keyword spotting in human speech?
I am trying to use Dynamic Time Wrapping (DTW) + KNN to detect word occurrences in human speech audio.
I am to implement the same approach suggested in this DSP StackExchange post, but I am seeing ...
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1answer
58 views
How to compute key of a song?
I'm looking for a precise way to compute the key of a song. BPM would be cool too. Analog is ok. I tried to approach it from the DFT angle, but got stuck and can't really put a finger on what's the ...
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0answers
38 views
audio processing for audio files quick listening
I need to speed the listening task. I want to listen only 1 second every three seconds.
Could you give me some advice?
Many thanks!
Best regards, Sergio
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1answer
75 views
Biquad high-pass filter not working as expected
I'm trying to implement a high-pass filter using the the coefficients described in RBJ's well-known EQ cookbook (see https://www.w3.org/2011/audio/audio-eq-cookbook.html).
However, when I run white ...
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1answer
105 views
Preprocess sound for voice recognition in Pocket Sphinx on Raspberry Pi 3
I want to improve my voice recognition system on a Raspberry Pi 3 running Pocket Spinx. It's pretty accurate (limited recognition vocabulary) but is terrible when other noise is around.
Is there any ...
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2answers
20 views
Sudden loudness changes producing unwanted noises?
What's that effect called? Is that one of the reasons for having attack and release parameters when implementing synths? And is there a generic method to avoid such sound artifacts?
Example: I have ...
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2answers
72 views
How to reconstruct a sound from magnitude spectrogram?
I have an audio magnitude spectrogram but I don't have the phase, try to randomize the phases of each container and then make a reverse fourier, but only pure noise is heard
How can I reconstruct the ...
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2answers
37 views
Can I slow down an audio file by halving the sampling rate?
A question came up, and as a layman I am not sure how to appropriately find an answer; bear with me.
Given a 2 minute audio file, say a .wav file sampled at 44,100 Hz, I am curious if it is possible ...
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0answers
27 views
Granular synthesis of a periodic waveform - How to derive grain start and end point
I understand to find the length of the grain I need to perform an FFT over the source to find the fundamental harmonic, I can do that and find an accurate grain length, but now I need to find a start ...
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1answer
31 views
Are Total Harmonic Distortion and Noise (THD+N) and THD correlated in practice?
I've read about THD and THD+N due to interest in audio quality.
Some audio devices (ej. speakers) report %THD or %THD+N. %THD+N is greater than %THD. I've found that sometimes the difference is huge, ...
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1answer
40 views
Does FFT magnitude of a sound drop to 1/10 of its value if sound level is decreased by 20dB?
I understand decibel = 20 * log (magnitude/reference value). To truly appreciate the meaning of this, if I have a single frequency tone that corresponds to a certain FFT magnitude shown on a PC that's ...
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0answers
17 views
De-Doppler a signal: Audio Timestretch Factor controlled by function f(x)?
Timestretching usually is constant. Few programs offer bézier handles and such to control the lead-in and lead-out. But that's all. I need better.
So the audio I have was in fact recorded in ...
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0answers
23 views
Applying binary mask to audio signal
I am trying to implement a simple VAD algorithm (a weighted ES VAD method from http://ceur-ws.org/Vol-2259/aics_17.pdf) and have been able to derive a mask that is either a 1 if speech conditions for ...
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2answers
93 views
Half Window Functions and Formulas
I am looking at implementing different window functions in an application I am making. I have found the formulas for all major symmetrical windows, however I would like to implement half windows.
...
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1answer
48 views
Attenuate the low frequencies in a speech wave
I am designing an FIR filter to attenuate the frequencies below 300Hz. I designed the filter using the ...
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2answers
78 views
Phase information of a signal when creating a spectrogram
Sorry for the uninformed question but I need some help understanding this. I'm trying to understand what phase information is and it would be very helpful if someone could correct my understanding of ...
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2answers
971 views
How do I explain a complex exponential intuitively?
What is a complex exponential, explained intuitively?
How do I explain to an adolescent a complex exponential function?
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1answer
145 views
Removing breaths using python
My wife is trying her hand at making audio books and spends a lot of time cleaning up some voice actors breaths in their "finished" audio. We have tried some filters in Adobe Audition and it helps but ...
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1answer
99 views
High resolution spectrograms
I have a recorded audio signal that I would like to convert into spectrogram with the highest possible yield of information.
The audio clips I am working with is about 30 ms long and contains ...
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2answers
79 views
Advantages of an orthogonal filterbank
What are the advantages orthogonal filterbanks such as the DFT or DCT have over non-orthogonal filterbanks?
I have heard quite often that they have attributes that are desirable when modifying the ...
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1answer
45 views
Loudness detection for natural conversation
I'm working on a project where I want to be able to analyze natural conversation as an audio file and determine the points in the conversation where the speech is louder than normal i.e. be able to ...
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0answers
94 views
Audio experiment with intermodulation by multiplying two analytic signals
1) First, I describe intended processing with a basic case:
Let's say on left channel I have a sin wave with frequency F1, and constant amplitude A1.
Then on right channel a sin wave with frequency ...
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1answer
53 views
Low-Pass FIR that keeps all values positive
Let's say, that I want to low-pass the norm (hence positive values) of an analytic signal (related to Hilbert transform). This allows me to perform experiments with the envelope of audio.
For low-...
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1answer
50 views
Is the sum of all FFT bins from Audacity equal to RMS amplitude?
Say I open an audio segment with Audacity. Then I perform a size 4096+ FFT with a rectangular window. The program outputs bin magnitude values in dB. If I add them all together like this:
sum = 10*...
