Hi, I am trying to play/record sound from my sound card over a phone line using the modem. So I have a couple of cabels connecting the...

Hi, I am trying to play/record sound from my sound card over a phone line using the modem. So I have a couple of cabels connecting the modem with the sound card. I have a standard full-duplex voice modem. I have tried different variations of AT+VLS command, but I can only receive sound from the line into the sound card (at+vls=5) I still cannot get the sound from the sound card into th...

Hello again, It's me the novice DSP'er who would be king.. er.. frog? :) I want to tell when a sound source is "pointing" towards a...

Hello again, It's me the novice DSP'er who would be king.. er.. frog? :) I want to tell when a sound source is "pointing" towards a microphone. The sound source is mobile, but I have complete control over its movement and sound emission. I can easily play repeatedly a pre-recorded sound from the sound source, which will be identical every time it's played. Obviously, it will not be i...

I have some Quicktime MOV's that I recorded on my camera with the lens cap on, purely for the sound. Player software indicates the sound is...

I have some Quicktime MOV's that I recorded on my camera with the lens cap on, purely for the sound. Player software indicates the sound is recorded as U-Law, 16KHz, 8bit, mono. I want to extract the sound to a separate (sound specific) format for further editing, and am offered the choices (in current software) of MP3, Wav, AIFF and AU. The ideal is to get a sound-only rendition of t...

Sound chip (DSP) recordings... How is it done? Pardon my ignorance and naivety, but.... A group of model railroaders would like to...

Sound chip (DSP) recordings... How is it done? Pardon my ignorance and naivety, but.... A group of model railroaders would like to customize/personalize the train sound announcements that have been recorded on the sound chip on their locomotives and railcars. Is there a website that, in layman's language, explains how sound effects are "recorded" on a sound chip? ... and, how one would/c...

Hi there, I am synthesizing a particular sound using additive synthesis. Hence I dont have to do any FFT's or IFFT's, I basically sum the...

Hi there, I am synthesizing a particular sound using additive synthesis. Hence I dont have to do any FFT's or IFFT's, I basically sum the individual sinusoids whose phase, frequency and amplitude components I know, to produce a complex sound. My problem is that instead of synthesizing the full 10 seconds of sound all at once, I need to be able to create them in small 'sound frames', which w...

I have questions regarding sound card for data acquisition from multiple microphone simultaneously. 1)Which sound card is better to get data...

I have questions regarding sound card for data acquisition from multiple microphone simultaneously. 1)Which sound card is better to get data from these multiple microphones. 3)how do i get same sound data from multiple microphones into matlab workspace using matlab sound acquisition tool box Thanks Sylvia _____________________________________ Do you know a company who employs ...

Hello I?m investigating an irritating sound in the building I live in. The sound disappears at 22.58 a clock. I have traced the sound to...

Hello I?m investigating an irritating sound in the building I live in. The sound disappears at 22.58 a clock. I have traced the sound to about 144 Hz with a program called Spectran. There I can se that it disappears at 22.57 a clock. The janitor says it may be a water circulation pump in the seller that makes the sound. I would want another program that allows filtering the...

Hi All, I want to transmit AM RF signal (1khz to 20 Khz) using sound card. The audio out of sound card will be connected to Antenna...

Hi All, I want to transmit AM RF signal (1khz to 20 Khz) using sound card. The audio out of sound card will be connected to Antenna directly. i need software that take sound file and generate AM RF signal for the above range and produce desired AM signal to be transmited on air, high out put power is not required, I am unable to find any software, Any help by anyone will be highly apprec...

Hi, I am doing some experiments on sound synthesis. I've made a simple plucked string sound synthesizer (with MIDI input), but I'm experiencing...

Hi, I am doing some experiments on sound synthesis. I've made a simple plucked string sound synthesizer (with MIDI input), but I'm experiencing some problems with the end of notes. When I hit and then release a key on my MIDI keyboard, I can hear an annoying little sound because of the signal going suddently to zero when I stop the note synthesis. I tried to figure out how software like a ba...

Hello, My name is maz and I am working on simple sound source localization. My question is how do I calculate the delay between these two sound...

Hello, My name is maz and I am working on simple sound source localization. My question is how do I calculate the delay between these two sound signals using cross-correlation in matlab. (I am not considering sound for the start as i have taken the readings in a sound free environment). I do not know since I am still learning. Can you please explain with the help of the matlab code. Thank you.

I have basic question about the HRTF based sound localization.Do the HRTF based sound localization algorithms suffer from front-back...

I have basic question about the HRTF based sound localization.Do the HRTF based sound localization algorithms suffer from front-back ambiguity problem?I am trying to use one of the HRTF algorithms to detect sound source direction in azimuth in the presence of noise,sometimes,it detects the azimuth symmetrically in the back plane when source is infact in front planeand viceversa.What can be the r...

We are often told that sound intensity (I assume Power) goes down as the inverse square of distance. However, I believe this is also frequency...

We are often told that sound intensity (I assume Power) goes down as the inverse square of distance. However, I believe this is also frequency dependent (as with e/m waves). What is the equation for a sound source received at a distance d with frequency f say? I read somewhere that low frequency sound (say 50 Hz or so) will travel vast distances and is also humidity and temperature dependent....

A lady just contacted me and says she can hear her Nokia phone charging - like a pulsing sound. Nobody else can hear it but when it is switched...

A lady just contacted me and says she can hear her Nokia phone charging - like a pulsing sound. Nobody else can hear it but when it is switched on she registers the sound from some 2-3 metres away. When it is charged the sound stops. I also know of another person who can hear similar sounds from electrical equipment. Could this be a low frequency sound or is it something odd happening...? Wit...

Hello guys, My name is Lior. I need your help with a project I am currently working on. I need to catch sound traveling from the modems...

Hello guys, My name is Lior. I need your help with a project I am currently working on. I need to catch sound traveling from the modems speaker phone to the sound board (SB). the sound is not traveling with wave-in/out commands but in a certain driver level, cause all of the sound when a conversation is started, is directed to the SB automatically (even when I track the number of current...

Hi all, I am looking for a simple and cheap design of a sound delay box for science fair exhibit. It should simply delay microphone...

Hi all, I am looking for a simple and cheap design of a sound delay box for science fair exhibit. It should simply delay microphone signal within the range (regulated) from 0.1 to 5 seconds. Sound quality does not really matter. I considered a PC with sound card (bulky) or professional audio console (expensive). Perhaps a simple DSP board with codec and some memory plus a small preamp...

Hi, Everyone! If I have analyzed a sound and have its spectrogram, how can I utilize that information for sound synthesis? Thank You Very...

Hi, Everyone! If I have analyzed a sound and have its spectrogram, how can I utilize that information for sound synthesis? Thank You Very Much. Truly Yours, Simon Dexter

Hello everybody! Here is a kind of silly question, you know. I write a radio station program that reacts on some sound events...

Hello everybody! Here is a kind of silly question, you know. I write a radio station program that reacts on some sound events detected within a continious audio stream received through a sound card input channel or whatever. A program runs and at the specified moment starts to listen to the input audio stream and tries to detect a sound pattern that it's been trained before (a PCM file or so...

Hi My goal is to take sound data from multiple microphones into MATLAB workspace. I have got the sound card Creative Audigy 4 pro for...

Hi My goal is to take sound data from multiple microphones into MATLAB workspace. I have got the sound card Creative Audigy 4 pro for multiple microphone input.I would be glad if some one has info regarding 1.How to connect multiple microphones to this card,which terminals/ports will be used. 2.How can I read the audio data from the microphones through the sound card in MATLAB(for ex...

Hi, I am confused about the exact function of an analog TV demodulator. Does a demodulator for an analog channel take as its inputs already...

Hi, I am confused about the exact function of an analog TV demodulator. Does a demodulator for an analog channel take as its inputs already separated CVBS and Sound IF signals, or does it take as its Input the the full analog channel (including video and sound) at baseband (or IF?) and then filter/separate the CVBS and Sound IF as it's Outputs? Take for example the following process: 1) Take ...

I have made a program that timestretches WAV sound files using granular synthesis. It has three variable input values: % stretch factor, grain...

I have made a program that timestretches WAV sound files using granular synthesis. It has three variable input values: % stretch factor, grain length (in samples) and grains per second. All seems to be working fine except for one problem I'm having with the pitch of the stretched sound. If, for example, I stretch a sound to 200% with a grain length of 1000 samples and 41 grains per seco...