phase corrector / filter with arbitrary phase and amplitude / designer tools

Started by in comp.dsp12 years ago 18 replies

Hi I am creating the active bass trap. It is device to correct room acoustic similar to...

Hi I am creating the active bass trap. It is device to correct room acoustic similar to this: http://www.bagend.com/bagend/downloads/ETrap.pdf http://www.bagend.com/bagend/ETrap.htm In few words - It receives sound from room via microphone, filters by pass band filter (tuned on resonance frequency of room) and transmitting via speaker sound in opposite phase. This sound wave is opposite t...


subtracting two audio samples, how?

Started by Bill Chiu in comp.dsp18 years ago 6 replies

Hi: I've gave considerable thought into this but my math sucks.. I have two sound samples, each 10-20 seconds of sound at something like...

Hi: I've gave considerable thought into this but my math sucks.. I have two sound samples, each 10-20 seconds of sound at something like 44Khz - I need to subtract one from another, so I end up with a prototype and a difference, where the difference should be very small, and overall uses less storage. Supposed both samples are extremely similar to our human ears, and the beat of the samp...


IVR

Started by anuradha_12 in comp.dsp12 years ago 11 replies

hi guys Im new to DSP and stuff.I'm trying to create an IVR for my final year project. I'm planing to use Goertzel algorithm for this.This is a...

hi guys Im new to DSP and stuff.I'm trying to create an IVR for my final year project. I'm planing to use Goertzel algorithm for this.This is a non TAPI windows based IVR which uses live sound stream to detect DTMF tones. Following APIs will allow me to access to the sound card WaveInOpen() waveInPrepareHeader() waveInAddBuffer() waveInStart() waveInUnprepareHeader() waveInClose() D...


A better window than hanning

Started by thedude in comp.dsp17 years ago 6 replies

Hi Im working with DSP for a school project. We have made a sound compression program for wav files. We uses a hanning window and makes...

Hi Im working with DSP for a school project. We have made a sound compression program for wav files. We uses a hanning window and makes 50% overlap on our sound samples, before we use out fft. Is there a window that uses less overlap with the same result?


Different Resampling Rates for Segments of a Sound File

Started by jeffdod in comp.dsp16 years ago 17 replies

I am having a problem with an application I am developing and don't know where to look for help. I thought I would try posing some questions...

I am having a problem with an application I am developing and don't know where to look for help. I thought I would try posing some questions here. I have an application where an analog sound source is recorded at a *very* slow rate (about 1/4 of the intended playback speed). Also, the machine playing the audio does not run at a regulated speed, which introduces a certain amount of "wow" in...


sound visualization (fft, spectrum, phase, panning, etc)

Started by dial...@gmail.com in comp.dsp16 years ago 2 replies

Hi friends, This is my first post to the list. I have been developing some sound visualization software in linux using c/c++ & openGL for quite...

Hi friends, This is my first post to the list. I have been developing some sound visualization software in linux using c/c++ & openGL for quite some time now, and I am having difficulty. So i've been trudging through the net looking for examples to do the different items i have mentioned below. I have made some good progress, and found a few examples for FFT's and such. And having my own pr...


Silly problem with sound source localization

Started by lapidarylee in comp.dsp12 years ago 12 replies

Hi supersonic localization tech is widely used in many field, does it apply to sound source localization ?! Maybe it is an extremely silly...

Hi supersonic localization tech is widely used in many field, does it apply to sound source localization ?! Maybe it is an extremely silly question, but I really want to know why or why not Regards Ryan


How to model or standardize two microphones for Audio Processing?

Started by charansai in comp.dsp6 years ago 16 replies

I am working on Active Noise Cancellation Project, where I am using two microphones ( reference micriphone, error microphone ) and one...

I am working on Active Noise Cancellation Project, where I am using two microphones ( reference micriphone, error microphone ) and one loud speaker. For this, I have bought two microphones (K├Ânig Electronic CMP-MIC8), the problem now is to process them . Even though both are of same model, their signals with out sound/ with sound are quite different and not matching at all. As I will use adaptiv...


Would this approach be possible (for analog modeling)?

Started by Rock Lobster in comp.dsp14 years ago 12 replies

Hello, so far I didn't read anything technical about analog modeling, but I thought about some very simple and straight-forward approach and I...

Hello, so far I didn't read anything technical about analog modeling, but I thought about some very simple and straight-forward approach and I wonder if that would work (at least to a semi-satisfying level) or if this would result in a sonic catastrophy :) How about creating a white-noise sound, which gradually gains volume from 0 to 10 (or maybe to 11? :), and then running this sound throug...


announce: Sound Synthesis Algorithms and a Framework

Started by bfr in comp.dsp14 years ago 2 replies

Hello I've initiated a technology transfer project that puts industry-grade algorithms for sound generation into the public domain....

Hello I've initiated a technology transfer project that puts industry-grade algorithms for sound generation into the public domain. Furthermore, an open-source framework for realtime audio development in C++ is provided. Have fun building your own synth. www.icst.net/dsgdownload/ Best regards Beat Frei


LPC and voice reconstruction

Started by Sergio in comp.dsp15 years ago 1 reply

Hello everybody. I'm doing some programs that treat human speech. As part of my project, I want to do a module that extracts the LPC...

Hello everybody. I'm doing some programs that treat human speech. As part of my project, I want to do a module that extracts the LPC coefficients of a piece of speech, and I'd want to find an algorithm to reconstruct a waveform that could sound, aproximately, as the original sound that I take my LPC coefficientes from. I've recorded my voice, saying a vowel, for example, something li...


Short wav files

Started by Richard Owlett in comp.dsp14 years ago 10 replies

I'm looking for short relatively simple sound files for input to some experimental sound analysis software. Suitable files would be up to 30...

I'm looking for short relatively simple sound files for input to some experimental sound analysis software. Suitable files would be up to 30 seconds or so ( I can truncate as required) Type of sources I'm looking for would be: piano or violin scales a monotone instrument with significant wow AND flutter for those from 60's -- a saw blade being bowed and flexed I haven't foun...


bass distortion

Started by Luis Fernando in comp.dsp17 years ago 1 reply

hello i'm trying to implement a distortion for guitar with waveshapes like: f(x) = ((1+A)*x)/(1+A*fabs(x)) or f(x) = x*x*x/3; the problem...

hello i'm trying to implement a distortion for guitar with waveshapes like: f(x) = ((1+A)*x)/(1+A*fabs(x)) or f(x) = x*x*x/3; the problem i'm having is that, for low frequencies (bass), the sound is strange... it tends too much for treble (not exactly treble, but more likely a medium frequency) and doesn't sound good... at the same time, I can't cut those frequencies because, since it ...


Question about dereverberation filters

Started by JAKOB ASHTAR in comp.dsp16 years ago 2 replies

Hey everybody... I have a speech signal with too much echo....sounds like the speaker is talking in a tunnel or something....Is it possible to...

Hey everybody... I have a speech signal with too much echo....sounds like the speaker is talking in a tunnel or something....Is it possible to dereverberate this signal? If so, how?


Histogram and periodogram

Started by HardySpicer in comp.dsp12 years ago 4 replies

Are they the same? Also, I read that the Periodogram can be used be used for Probability Mass Function (like PDF for discrete signals) but this...

Are they the same? Also, I read that the Periodogram can be used be used for Probability Mass Function (like PDF for discrete signals) but this sounds a but dodgy. Hardy


pitch scaling and chorus

Started by Patrick in comp.dsp15 years ago 9 replies

Hi, I am trying to implement an algorithm that will pitch-scale an incomming sound in real-time. If I try the algorithm that Stephan M....

Hi, I am trying to implement an algorithm that will pitch-scale an incomming sound in real-time. If I try the algorithm that Stephan M. Bernsee did, or follow indications from other websites, this introduces a chorus-like effect in the sound. almost everywhere they talk about avoiding the "alvin and the chipmunks" effect, but that's exactly what I want to do. Now if I take the same algo...


TDOA and localisation (inexperienced Matlab user)

Started by nickch in comp.dsp13 years ago 12 replies

Hi, I've been thrown into a project that involves determining the location of a sound source and tracking its movements. I have very little...

Hi, I've been thrown into a project that involves determining the location of a sound source and tracking its movements. I have very little matlab experience but have been trying to cope. This site has been very useful. The general idea for the project is implementing a finger mouse where you have an array of microphones that detects the sound emitted by a finger sliding across a surface and e...


More acoustic beamformer questions

Started by Tom in comp.dsp18 years ago 11 replies

I was just wondering if an acoustic beamformer can be made to work in reverse. Suppose we have say eight loud speakers, can the sound be focused...

I was just wondering if an acoustic beamformer can be made to work in reverse. Suppose we have say eight loud speakers, can the sound be focused in a narrow 'corridor'? To a certain extent I expect hi-fi surround sound is doing something similar but there the speakers surround you - here they would be together in an array.I wonder What would happen in the limit ifwe could have say 100 small l...


OT: What's up with the recruiters in the UK ?

Started by Bob in comp.dsp16 years ago 7 replies

Hi, I have noticed that UK recruiters are very colorful with their words in their job advertisements for DSP engineers. What's up with that?...

Hi, I have noticed that UK recruiters are very colorful with their words in their job advertisements for DSP engineers. What's up with that? Is the working environment horrible in the UK? It sounds to me like they are very "hungry" for applicants..


OT: FCC newsroom monitoring

Started by Randy Yates in comp.dsp8 years ago 18 replies

Have you heard? This sounds to me like the most vicious attack against America's first amendment in the history of the country. -- Randy...

Have you heard? This sounds to me like the most vicious attack against America's first amendment in the history of the country. -- Randy Yates Digital Signal Labs http://www.digitalsignallabs.com