cross correlation

Started by maz_p5 in comp.dsp11 years ago

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.


Noise convolution?

Started by Michel Rouzic in comp.dsp10 years ago 3 replies

These last few days using my program Photosounder ( http://photosounder.com ) I've been experimenting with a new sort of weird reverb-like...

These last few days using my program Photosounder ( http://photosounder.com ) I've been experimenting with a new sort of weird reverb-like effect on sounds (detailed with examples here http://photosounder.com/blog/2009/05/motion-blur-sound-reverberation.html ) and people who heard the result expressed their interest in me making a real-time VST effect out of it. The problem is that since it'...


Why is my level adjustment distorting the output?

Started by Anonymous in comp.dsp13 years ago 2 replies

Hi all. I've got some 16-bit PCM data, and I'm trying to add a level adjustment to my code. I thought it would be really straight...

Hi all. I've got some 16-bit PCM data, and I'm trying to add a level adjustment to my code. I thought it would be really straight forward, but it's causing a lot of distortion when I try to lower the level. It sounds bad most of the time if I increase the level, but I'm pretty sure that's just clipping. If the db_gain variables are set to 0, everything sounds fine. Here is the code:...


Re: Opposite of Mu-law?

Started by Ben Bradley in comp.dsp15 years ago

In rec.audio.tech,comp.dsp, Richard Owlett wrote: > Ben Bradley wrote: > [snip] > > The music industry 'standards' for making a CD...

In rec.audio.tech,comp.dsp, Richard Owlett wrote: > Ben Bradley wrote: > [snip] > > The music industry 'standards' for making a CD have changed in the > > past decade or so. A song that sounds 'louder' is, at first listen, > > deemed more interesting and exciting, so it will sell more CD's than a > > clean-but-not=as-loud song, so record labels are making songs sound


Audio vs Video

Started by Vladimir Vassilevsky in comp.dsp12 years ago 12 replies

Just an observation: the largest part of a modern computer game is the library of the miscellaneous sound samples. Announcements, dialogs,...

Just an observation: the largest part of a modern computer game is the library of the miscellaneous sound samples. Announcements, dialogs, nature, music, etc. Isn't it strange that the video part of a game is produced by the real time rendering of some kind of a simple model of the reality, whereas the audio is stored as the samples of the live sounds? Why the fairly sophisticate...


Sound synthesis and signal continuity

Started by randirandi in comp.dsp10 years ago 2 replies

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...


Post-doc in Acoustic Event Detection (US citizens only)

Started by Anonymous in comp.dsp13 years ago 65 replies

The International Computer Science Institute (ICSI) invites applications for a postdoctoral Fellow position in acoustic event detection. The...

The International Computer Science Institute (ICSI) invites applications for a postdoctoral Fellow position in acoustic event detection. The Fellow will be working with Nelson Morgan, along with international colleagues, in the area of the detection of one particular target word and/or sound in the background of all other possible words or any other realistic sounds. The applicant is expected...


Testing FIR filter

Started by Rockerboy in comp.dsp11 years ago 4 replies

Hi, I am new to DSP. I am doing a low-pass and high-pass 7-tap moving average filter filter on Xilinx Virtex II Pro FPGA. I am recording a...

Hi, I am new to DSP. I am doing a low-pass and high-pass 7-tap moving average filter filter on Xilinx Virtex II Pro FPGA. I am recording a sound, storing it in DDR RAM and filtering it and playing it back. But, the output sounds like noise for both low-pass and high-pass filters. Could someone please let me know what I could be doing wrong? Also, how can I calculate the cut-off freque...


Sound Intensity

Started by HardySpicer in comp.dsp12 years ago 13 replies

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....


sound card AM Transmitter

Started by Masood in comp.dsp11 years ago 28 replies

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...


sound delay box

Started by Aleksander Wittlin in comp.dsp14 years ago 7 replies

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...


Interpolation

Started by UD.RaggedRobin in comp.dsp9 years ago 6 replies

I seek a program that will take two sound files (A and B) of approximately equal duration and produce a third sound that is a blend of A and B...

I seek a program that will take two sound files (A and B) of approximately equal duration and produce a third sound that is a blend of A and B throughout its duration. i.e. I want to be able to produce the middle sound shown below. AA AA AA AA AA ab ab ab ab ab


Crossover networks. Can someone recall the name?

Started by Jerry Avins in comp.dsp13 years ago 72 replies

Vladimir Vassilevsky wrote: > > > Jerry Avins wrote: > > > > A linear-phase phono equalizer completely louses up the transient >...

Vladimir Vassilevsky wrote: > > > Jerry Avins wrote: > > > > A linear-phase phono equalizer completely louses up the transient > > response. A "perfect" linear-phase speaker crossover often sounds much > > worse that the minimum-phase analog approximation that it replaced. > > > > Don't look at the transient response and linear phase will sound just as > good as the minimal pha


Sound gaps

Started by Anonymous in comp.dsp10 years ago 4 replies

Hello, A while ago this group and comp.compression were very helpful in pointing to some websites to help develop my software sound...

Hello, A while ago this group and comp.compression were very helpful in pointing to some websites to help develop my software sound driver (note: aside from the DAC all processing/filtering is done in software.). Now I have a new problem where I don't know where to look for the answer(s) so I am begging for a little help. After lots of work in improving sound quality I just ran i...


newbie: What is sound & how to invert it.

Started by news in comp.dsp15 years ago 2 replies

Hi, I am a programmer and recently got interested in the mechanics of a sound. Here is what i have done till now and will need your help to...

Hi, I am a programmer and recently got interested in the mechanics of a sound. Here is what i have done till now and will need your help to proceed from there. I am capturing sound from my microphone. And now I need to send out it's inverse( sort of 'noise cancellation' - but I am aware of the difficulties with noise cancellation). WHAT I am trying to understand is what is meant by 'inv...


Basic sound card access

Started by caalip in comp.dsp12 years ago 3 replies

Dear Neighbors, My group at school is working on a project, and I would like infomation about basic sound card input/output. i guess...

Dear Neighbors, My group at school is working on a project, and I would like infomation about basic sound card input/output. i guess what I would very like to see is what functions read form a sound card. Thanks for any ideas You can give me.


The instruments don't sound the same. What am i doing wrong ?

Started by bah in comp.dsp8 years ago 7 replies

I am using pure data. I am using -- kick, snare, hats to create a simple beat with a bassline. But for some reason, each instrument does...

I am using pure data. I am using -- kick, snare, hats to create a simple beat with a bassline. But for some reason, each instrument does _not_ sound the like the one i listen in, say dnb music. I have added reverb to each instrument but still there is no change. They sound too hollow and artificial. From what I can gather, I should be using a 1) EQ filter 2) A constant ambient b...


play sound in C or C++

Started by ldkha1979 in comp.dsp11 years ago 6 replies

hi all, I want to know how to play sound form an array of value with a given frequency sampling (Fs = 16000Hz). I have an array of value (16...

hi all, I want to know how to play sound form an array of value with a given frequency sampling (Fs = 16000Hz). I have an array of value (16 bit) then I wwant to play like with sound.m in matlab. Thks a lot!


A Sound Pattern Detection Within A Continious Audio Stream

Started by Ptomaine in comp.dsp13 years ago 16 replies

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...


Specifications of sound card required for data acquisition from multiple microphone

Started by Sylvia in comp.dsp12 years ago 1 reply

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 ...