The tag has no usage guidance.

learn more… | top users | synonyms

2
votes
0answers
25 views

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 ...
0
votes
0answers
22 views

Speaker localisation using time difference of arrival

I am trying to implement a speaker positioning algorithm using time difference of arrival. My system is consisted of three microphones on a known location and a speaker which I need to locate using ...
3
votes
1answer
110 views

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 ...
0
votes
2answers
42 views

Synthetic sounds to describe motion in 3d or 100d

Watch a butterfly flitting about, or an optimizer chugging along in 3d or 100d -- a sequence of points $X_1 \ X_2 \ X_3\ \ldots$ How could one generate synthetic sounds that convey moving fast or ...
1
vote
0answers
86 views

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 ...
0
votes
2answers
48 views

Why noise canceling headphones do not attenuate the signal itself?

Noise canceling headphones use a microphone to capture noise in order to cancel it. How is it guaranteed that the microphone will not record the actual signal and attenuate it?
0
votes
0answers
16 views

Get keypad codes using the fact that every number has a different pitch

I wanted to do a small weekend project not from my area of work. I think it'd be interesting to write an app which would take in audio recording of people using a keypad and write out list of codes ...
1
vote
2answers
46 views

Generating very short signals

So I need to program (using Java) some things that include generated sounds. I am struggling to understand how to make it work because I require a rather short signal while still using a sampling rate ...
0
votes
2answers
50 views

How to do the highest resolution FFT?

I wish to do the FFT of streaming audio data coming into a computer. I am just interested in frequencies from 80 Hz up to 1000 Hz but with a frequency resolution of 3 to 4 Hz and no more. Basically ...
1
vote
1answer
95 views

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++...
1
vote
1answer
55 views

Multichannel input/output evaluation board

I'm working on a project at school and the first step is to choose a dsp/evaluation board but I'm having trouble. The project is to create a system that can be used for a variety of audio applications ...
3
votes
0answers
52 views

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,...
3
votes
1answer
54 views

Sound reflections plot

This is probably an idiotic question, but I'm at a loss of what to even google for. I have sound files that contain recordings of an impulse signal in a room. I'd like to make such a plot from it. I ...
4
votes
1answer
55 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
65 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
45 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
24 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 ...
3
votes
1answer
84 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
52 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. ...
2
votes
3answers
90 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
112 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
37 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
1answer
43 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
65 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
73 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
91 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
67 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
221 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
35 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
64 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
46 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
290 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
79 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
210 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
104 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
156 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
115 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
228 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
46 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 ...
3
votes
1answer
98 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
345 views

Effect of frequency shift on a sound signal

I had two sound files and did the following to it: ...
3
votes
4answers
198 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
62 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
46 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
85 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 of ...
-1
votes
1answer
552 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 ...
1
vote
1answer
66 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
832 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
87 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 ...