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3
votes
1answer
27 views

What does MATLAB display when plotting a sound signal?

When you load the speech file 'mtlb' in MATLAB (which is by the way the voice of a woman saying the word 'MATLAB'), and plot the data, you get the following plot: My question is this: what does the ...
3
votes
1answer
50 views

Acoustic room simulation - Craven's hypothesis

I'm reading Udo Zölzer's "Digital Audio Signal Processing" and there's a piece about acoustic room simulation. This question will be more about maths and acoustics, but I assume anybody who does DSP ...
0
votes
0answers
24 views

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. ...
0
votes
0answers
15 views

1D Microphone Array Performance in radius domain

In angle of arrival Microphone array's gain is good enough . But I am curious about microphone array's gain in the radius direction. I know microphone arrays can focus in to radius direction like ...
1
vote
1answer
40 views

Acoustical Design considerations for Active Noise Cancellation Project for Air vent

I am working on ''Active noise cancellation for air vent'' project. I am using NI myRIO1900, Audio Technica ATR 3350 omni directional microphones and Tevion Loudspeakers. I have done the programming ...
0
votes
1answer
37 views

Simulating musical instruments using their impulse response

I studying DSP and trying to find the limitation of 'teaching' a software to emulate a musical instrument by sampling its notes at different velocities and building an LTI system for simulating it. ...
1
vote
3answers
65 views

Are there libraries for extraction of sound wave features?

I am looking help for my project for which I need C++ (or any other language) libraries useful for extraction of sound wave features like frequency, loudness, pitch and orientation. Using these ...
0
votes
1answer
69 views

Finding the right measure to compare sound signals in the frequency domain

I am comparing the spectral contents of some sound signals with Matlab. I have quite a few measures but wanted one that represents the centre of gravity of the spectrum. I used SpecCentroid() found ...
0
votes
1answer
30 views

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 ...
0
votes
0answers
19 views

audio for VOIP - filter and resample or viceversa?

I am a noob to signal processing, but I need to create some audio files for IVR for Asterisk VOIP. So my lady friend with a nice voice records her message on a Windows machine and sends me a 44KHz, ...
2
votes
0answers
50 views

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 ...
1
vote
1answer
62 views

Path to becoming an audio engineer [closed]

Can someone write down steps an totally beginner in EE and DSP needs to pass to become a audio engineer? From which subject to start with (math, electronics), and with which subjects to continue this ...
1
vote
2answers
75 views

How can I accurately represent an mp3's wave form in respects to time?

I'm trying to programmatically plot a sound wave that I have placed in a 2d array, however, I cannot consistently get the sound wave to reach the end of the window. For example, when you load a sound ...
1
vote
0answers
44 views

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 ...
1
vote
1answer
108 views

Is there an audio processing library/API that contains all standard features of a digital audio workstation?

I need an audio processing library/API (in any programming language, preferably Java or Python) that is able to do things to sound waves such as: sum/mix sources together, apply EQ, dynamic EQ where ...
1
vote
0answers
27 views

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 ...
1
vote
1answer
62 views

Why does the standard waveform from audio out get distorted when I reduce the amplitude?

In my attempt to generate a standard sine wave out of a sound card, I started using matlab which has a function soundsc for scaling the output ...
0
votes
0answers
38 views

Sound of sin(x * sin(x)) without accumulation

Tried this at the Mathematics board, but as someone there pointed out, perhaps this is better suited for the DSP board. I'll repeat the question as I asked it there: Playing around with the sine ...
1
vote
1answer
166 views

Baby Cry Sound detection

I wanted to write a code to detect baby cry sound. I am using Windows as platform. Presently, I am able to get audio samples and its frequency plot(using FFT) but not sure how to proceed forward. I ...
0
votes
1answer
60 views

Cancelling the acoustic echo that occurs with a variable delay and volume

I am trying to build a software that records audio to a server and then broadcasts that audio into the same room that the microphone is present. This means that the audio signal is uploaded to the ...
0
votes
0answers
107 views

Why sonar not used as radar?

When we want to do ranging and detection in air the first idea comes to mind is of RADAR. Sonar is mostly related to underwater stuff since it has less attenuation as compared to EM waves used in ...
0
votes
1answer
80 views

Detecting a specific pop in a real time audio signal

I am listening for a very definite pop in a real time audio signal. So far I have managed to get the audio signal in at a sampling rate of 44100.0 Hz and 2048 frames per second. I have visualized the ...
3
votes
1answer
147 views

Does our brain constantly ifft to hear?

From my understanding our ears have hairs/cilia in the cochlea that resonate at frequencies within our hearing range. To me this means we are hearing in the frequency domain as opposed to the time ...
0
votes
1answer
91 views

How to emulate human sound recognition

A person can recognise a large variety of sounds and fairly subtle differences in sound, even if they have only heard the sound once. Is it possible to recreate this with software, and how? ...
0
votes
1answer
155 views

Normalizing the magnitude of Goertzel Filter c#

I'm trying to detect some frequencies of 18Khz with sample rate of 44100 [samples/sec]. When I pass a buffer(~4500 samples) to the algorithm it returns a magnitude in a very strange range. Sometimes ...
0
votes
1answer
43 views

Ways to identify if music has vocal timbres in it?

The human voice is singular because it has a specific frequency spectrum and fast transitions between vowels and consonants. What are good and computationally fast ways to detect if there is probably ...
2
votes
1answer
87 views

Controlling one signal with another one (Rocket engine effect - Subtractive synthesis of sound)

I programming some sound effects in Java and exporting them into .wav files. Currently, I am trying to program a rocket engine sound effect. I want to do it in the following way: The sound of a ...
-2
votes
1answer
185 views

Effect of frequency shift on a sound signal

I had two sound files and did the following to it: ...
3
votes
4answers
177 views

Why every musical instrument sounds different than any other while listening?

This is soft question.I am not expert in music. We know that English language has 26 letters (which are again grouped into vowels and consonants) , while language of music is same all over the world ...
1
vote
0answers
49 views

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 ...
0
votes
1answer
41 views

What is the Sound of a Solution to the Wave Equation?

What is the sound of a solution $y(x,t)$ to the Wave Equation $\frac{\partial^2y}{\partial t^2}=c^2\,\frac{\partial^2y}{\partial x^2}\enspace$? To be clear, I don't look for a solution of the Wave ...
1
vote
0answers
73 views

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 ...
-1
votes
1answer
274 views

Feature extraction for sound recognition and classification

I am building an application that would "listen" to the microphone input, analyse it, and compare the analysis to a pre-analysed and pre-classified sound bank (small - maximum 20 sounds). It will then ...
0
votes
0answers
70 views

Running 2D array through FFT in matlab

I have an input file that is a 2D array but don't know how to convert code that I have to accept the original file and bandpass filter around 18-20 for frequency and then create the bandpassed output ...
0
votes
0answers
160 views

Removing background noise (sound) by attenuation below certain amplitude (loudness) in MATLAB

I have to write a MATLAB code that attenuates sound at low amplitudes to zero, in VoIP. Meaning I have to reduce low amplitude sound to zero E.G. while speaking I have some background noise (like the ...
1
vote
1answer
62 views

Calculating the power of a signal

I'm trying to calculate the power of a signal and my tutor has given me this formula to do it I've spent the past while building a program and now the foundations are there it's time to implement ...
0
votes
2answers
40 views

Acoustic record and store devices

I am working on a project involving analysis of bird sounds and I want to record these sounds in slightly remote locations. It is enough if the device can only record and store them (maybe in an SD ...
0
votes
1answer
587 views

How to convert Third Octave data into single SPL quantity

I have a data vector which consists of calibrated pressure at each sampled point in time. I have also taken this signal, applied a filter bank to it using a butterworth filter with passbands according ...
1
vote
1answer
79 views

Filtering noise and identifying phones boundary in speech recongition

I am planning to do a self project on speech recognition for a vocabulary detection system using arduino. I know CMUsphinx or bitvoicer is probably the way to go. But I would like to code the project ...
0
votes
2answers
276 views

Tutorial for a stereo Phaser in C++?

I was searching for a tutorial on how to implement a stereo Phaser in C++. All i´ve found was sourcecode with little or no explanations which did´nt help me much. Does anyone know a Tutorial with ...
1
vote
1answer
193 views

Find similarity of sound signal

So I was working on a program to comparing the similarity between the pronunciation of a word, First I got the audio file, and I use FFT on it to get the amplitude over frequency array, then I just ...
0
votes
6answers
205 views

Call recognition using Digital Signal Processing

We are looking for writing applications which would recognize Bird calls and Frog calls using Sound processing. EDIT: I want to identify the species of bird / frog and do not want to differentiate ...
2
votes
2answers
42 views

What are the parameters of transducer that I can get from an Anechoic chamber?

I have a bunch of piezo elements, that I want to use as "Mics", for that I will test their reaction in a Anechoic chamber. My question is what the are characteristics that I can measure that describe ...
1
vote
0answers
313 views

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 ...
0
votes
1answer
21 views

How to choose a microphone and make sure not to overcharge (clip) it?

I'm not sure that's the right forum to ask this question but I'll do it anyway. In my project, I've to listen to different machines using a MEMS mic by fixing the microphone directly on to the ...
0
votes
1answer
53 views

Segmenting a sound file before each of its attacks

Like the title says... I want to split audio file where a single instrument is played (not so fast)... I just need to detect the attack phase of the waveform to know where a played note begins. Can ...
1
vote
0answers
223 views

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 ...
2
votes
1answer
101 views

Air-coupled microphone

Does anyone know what the heck is a coupled-air microphone? I know that they were used for recording internal body sounds in papers like this and this. I googled the term, but I couldn't find any ...
1
vote
1answer
112 views

matching the mouth shape of an audio file(lip sync)

I am working on something like cartoon, but the character's mouth shape is automatically detected and matched by the word they are saying. my guess is to use speech recognize algorithm to analyze ...
0
votes
1answer
38 views

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 ...