LMS

Started by maz_p5 in comp.dsp11 years ago 6 replies

Hi, I am working on sound localization system. I want to find the co-ordinate of the sound source by least mean square method in MATLAB. I...

Hi, I am working on sound localization system. I want to find the co-ordinate of the sound source by least mean square method in MATLAB. I have the co-ordinates of the 4 microphones and the relative distance between mic 1 to the source to mic 2 to the source, i.e. the time delay*speed of sound. I even have the formulas but I have no clue on how to crack this: d12=sqrt((x1-xs)^2+(y1-ys)^2)...


Sound Localization

Started by Karthik Ravikanti in comp.dsp14 years ago 12 replies

Hi, I'm Back again. This time I have a different problem.... I tried to record a sinusoidal tone using a pair of microphones by plugging...

Hi, I'm Back again. This time I have a different problem.... I tried to record a sinusoidal tone using a pair of microphones by plugging the microphones into the line-in port of my sound card. I used Sony Sound Forge to record the signal.But what i saw was that both the channels were identical.It seemed like the recorded file was a sum of the individual mic ouputs. I connected the mics ...


Sound Localization using Sound Amplitude

Started by jigajigajoo in comp.dsp8 years ago 20 replies

I'm trying to figure out a way, given an array of 4-6 omnidirectional microphones in ideal conditions, to use the amplitude of a signal...

I'm trying to figure out a way, given an array of 4-6 omnidirectional microphones in ideal conditions, to use the amplitude of a signal to localize the location of that sound. I'm targeting this application to a microcontroller (an Arduino), which has a max sample rate of maybe 2kHz (per mic), and so trying to do TDOA analysis on the signal is hard. Not only that, but any difficult DSP is defin...


NN Copying of a guitar effect with Reverse Engineering

Started by MustafaUmutSarac in comp.dsp10 years ago 2 replies

I have a PC based guitar effects software. Some of the effects are great. First is Vienna Philharmonic Concert Hall Acoustic effect , Second...

I have a PC based guitar effects software. Some of the effects are great. First is Vienna Philharmonic Concert Hall Acoustic effect , Second is a tube based guitar amp effect. I want to analyse these input and output sounds digitally and train a dsp neural networks chip . If I am not wrong , I will be needed + A/D + DSP CHIP for finding the spectrum peaks of the input sounds-...


MPEG movies with sound

Started by Rune Allnor in comp.dsp15 years ago 2 replies

Hi all. I have used MPGWRITE with some success to make small MPEG movies from data I manipulate and plot with matlab. Now I want to put...

Hi all. I have used MPGWRITE with some success to make small MPEG movies from data I manipulate and plot with matlab. Now I want to put a sound track with the movie, but have a very vague recollection of having seen somewhere (I can't find any mention of it now) that MPGWRITE does not handle sound tracks at all. So my question is if there is any code available anywhere to generat...


quote to repair a sound recording

Started by Ed in comp.dsp14 years ago 4 replies

Hi, Hope I'm posting to the right group here. I have recorded a sound file on my mp3 player but when I play it back there's quite a lot...

Hi, Hope I'm posting to the right group here. I have recorded a sound file on my mp3 player but when I play it back there's quite a lot of interference. It's basically a taped conversation (personal). I'm looking for someone who could give me a quote to repair it for me as I don't know the first thing about sound editing. If interested please email me at vervoom@hotmail.com and I'll forw...


tracking sound source

Started by Sylvia in comp.dsp12 years ago 20 replies

Does any one know good material on tracking single sound source using only two microphones on a dummy head.I have seen kalman filter tracking...

Does any one know good material on tracking single sound source using only two microphones on a dummy head.I have seen kalman filter tracking for constant velocity targets etc in case of radar applications but i dont know how to use these in case of sound sources. Thanks


Refraction of Sound

Started by HardySpicer in comp.dsp10 years ago 20 replies

http://hyperphysics.phy-astr.gsu.edu/Hbase/Sound/refrac.html When sound refracts should we not be able to detect a change in pitch like the...

http://hyperphysics.phy-astr.gsu.edu/Hbase/Sound/refrac.html When sound refracts should we not be able to detect a change in pitch like the doppler effect? (because the wavelength must shorten - hence pitch increase). How do we model refraction - is this a non-linear effect ie it cannot be modeled with a LTI transfer function. Hardy


Synthesis from a spectrogram

Started by Michel Rouzic in comp.dsp13 years ago 7 replies

I made a program that makes a spectrogram out of a sound (with log base 2 frequency) output it as an image file and then is able to input...

I made a program that makes a spectrogram out of a sound (with log base 2 frequency) output it as an image file and then is able to input it again to turn it back into a sound. However, I'm meeting a problem. In order to make the spectrogram, I bandpass the original sound many times with an array of filters which frequency and width vary logarithmically and get the enveloppe out of each ban...


Phonemes and FFT (or any other transform good for sound)

Started by Anonymous in comp.dsp12 years ago 3 replies

I am interested in this topic any good links with intro and/or in depth incursion to the topic or truly good books? (I am a Mathematician, so I...

I am interested in this topic any good links with intro and/or in depth incursion to the topic or truly good books? (I am a Mathematician, so I don't need any of the basic Math part) ~ A good intro into lossless sound compression of sound I will need as well ~ Thanks lbrtchx


cross correlation sound

Started by maz_p5 in comp.dsp11 years ago 48 replies

Hello, My name is maz and I am working on simple sound source localization. I have to find the location of a sound source on a 2d plane. (I am...

Hello, My name is maz and I am working on simple sound source localization. I have to find the location of a sound source on a 2d plane. (I am not considering z axis). I have 4 mics placed on a wooden platform, the co-ordinates of which are m1(0,0), m2(0,6), m3(4,6), m4(4,0). del12 is the difference between the distance from mic 1 to the source and from mic 2 to the source. del12=(delay betw...


In-band high frequency noise in FM demodulation

Started by williamch in comp.dsp12 years ago 2 replies

Hi all, I have implemented FM demodulation(including Mono and Stereo) on FPGA. When it work on Mono mode, the audio quality sounds good. But...

Hi all, I have implemented FM demodulation(including Mono and Stereo) on FPGA. When it work on Mono mode, the audio quality sounds good. But if I changed the mode to the stereo, the audio quality sounds not very well. I have checked the spectrum of m(t), and there are high noise floor over high frequencies(looks like the response of a high pass filter). Even I changed the differentiator from ...


Gating sound level

Started by Stormiy in comp.dsp9 years ago 2 replies

Im implementing ITU standard based loudness measurement program and as it states i should use some kind of gating to exclude silence regions...

Im implementing ITU standard based loudness measurement program and as it states i should use some kind of gating to exclude silence regions from affecting measured average sound level - for example - Ill take general integration time of 3 seconds - if, for example the first second of whole sound contains speech and the last 2/3 of it contains silence (people taking breath, thinking or for simil...


intensity of sound/speech

Started by stromhau in comp.dsp12 years ago 10 replies

Hi, I am trying here because it seems like there are a lot of experts knowing all sort of DSP ++. Have found a lot of answers to othert...

Hi, I am trying here because it seems like there are a lot of experts knowing all sort of DSP ++. Have found a lot of answers to othert questions. My problem is to calculate intensity contours of a speech waveform with amplitude +1/-1 expressed in a desibel scale. I have spent 5-6 hours of googling without results. The intensity is defined as : sound intensity = sound power / (4 pi R2)...


intensity of sound/speech

Started by stromhau in comp.dsp12 years ago 1 reply

Hi, I am trying here because it seems like there are a lot of experts knowing all sort of DSP ++. Have found a lot of answers to othert...

Hi, I am trying here because it seems like there are a lot of experts knowing all sort of DSP ++. Have found a lot of answers to othert questions. My problem is to calculate intensity contours of a speech waveform with amplitude +1/-1 expressed in a desibel scale. I have spent 5-6 hours of googling without results. The intensity is defined as : sound intensity = sound power / (4 pi R2)...


Sound Source Localization

Started by Plum in comp.dsp14 years ago 17 replies

Hi, I'm working on a semester project on sound source localization, where my aim is to determine the position of the source of a sound using ...

Hi, I'm working on a semester project on sound source localization, where my aim is to determine the position of the source of a sound using two microphones and estimating the time delay of arrival. But, how do I process the signals from the two microphones??? I mean how do I send the two signals to a PC??? Say i add the two siganls....ow do i separate them then?


Combining Signals for Sound Card Line-In

Started by Polar in comp.dsp14 years ago 2 replies

Hey everybody, I'm currently working on a sound-source localization project and was hoping you could offer me some help. First, I have two...

Hey everybody, I'm currently working on a sound-source localization project and was hoping you could offer me some help. First, I have two microphones which I am running to two amplifiers (one for each signal). I want to read these signals with my PC sound card's line-in and signal process using MATLAB. Can I simply connect a Y-cable to combine the two amp outputs into a single, stereo i...


What about the return of Vinyl?

Started by Anonymous in comp.dsp4 years ago 26 replies

appears to be popular again. Just a gimmick or does it really sound better? It analogue after all. The noise is worse of course but could there be...

appears to be popular again. Just a gimmick or does it really sound better? It analogue after all. The noise is worse of course but could there be any advantage at all? Then we have valve amps. What's the fuss about them? Do they sound better?


Sound effects contract

Started by Mike in comp.dsp13 years ago

We seek an experienced DSP engineer for a 3 month contract. The project involves developing library routines for sound effects for an integer...

We seek an experienced DSP engineer for a 3 month contract. The project involves developing library routines for sound effects for an integer DSP chip used in games, toys and entertainment products. Sound effects include echo, reverb, chorus and flange. C will be used as much as possible, with the remainder written in assembler. We will provide an in-circuit emulator and all necessary so...


Creating raw sound data from IFFT - how to append sound chunks

Started by louis in comp.dsp14 years ago 3 replies

Hello, I was wondering if any of you knew anything about this, or could point me to some resources. So I have spectral data at about 100...

Hello, I was wondering if any of you knew anything about this, or could point me to some resources. So I have spectral data at about 100 time points which was taken over a one second time period. (This was obtained originally by doing a forward FFT on chunks of one second of sound data) Now for each of these spectrograms, where I have power vs frequency info, I perform a 1024 point inve...