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# Discussion Groups | Audio Signal Processing

Technical discussions related to Audio Signal Processing (digital effects, acoustics, noise reduction, musical signal processing, etc).

## Decent FFT code 0

Cuetek - Dec 24 2009
I'm building a guitar toy and I need an FFT for a dsPIC33 series processor and the Microchip C30 library FFT does not work. (Seriously, whoda thunk?) Being on the lazy side wrt cod...

## comparaison of 2 audio signals and calculation of filter 0

roma...@yahoo.fr - Dec 22 2009
Hi everyone, For a linguistics experiment, I have loudspeakers playing sounds in a room and they are directed towards a wall, which acts as a low pass filter when you hear the s...

## Re: Re: How do I "flip" the frequencies of a sound file? What I mean is... 0

Jeff Brower - Dec 16 2009
Possimpable- > Well I have Audacity and Goldwave, and I haven't found such a feature to apply these equations The equation is simple: y[n] = x1[n]*(-1)^n 1) Make a .wa...

## How do I "flip" the frequencies of a sound file? What I mean is... [2 Articles] 0

possimpable - Dec 16 2009
I want to take a sound file, and geometrically flip every frequency around,= say, A (440Hz). So A# becomes Ab, B becomes G, C becomes Gb... To basicall= y flip the frequency sca...

## Re: How do I "flip" the frequencies of a sound file? What I mean is... 0

Jeff Brower - Dec 16 2009
Possimpable- > Okay, but am I supposed to know what program to plug this > equation into? I already know the concept, I'm asking about > the execution. You're kidding m...

## Re: How do I "flip" the frequencies of a sound file? What I mean is... 0

Jeff Brower - Dec 16 2009
Possimpable- > I want to take a sound file, and geometrically flip every frequency > around, say, A (440Hz). So A# becomes Ab, B becomes G, C becomes > Gb... To basically f...

## What is the difference between active and passive noise control? 0

rraj...@gmail.com - Dec 10 2009
What is the difference between active and passive noise control? ...

## Writing an audio fader - basic question 0

rela...@hotmail.co.uk - Dec 9 2009
Hi, I'm in the process of adding an audio fader to my application, and I just wanted to check if I've got the basic principle right. I assume that all that is actually required ...

## FFT anaylisis of recorder (flute) 0

José_Tomás_Tocino_García - Dec 8 2009
Hi. I'm developing a musical game in which the player will have to play the recorder. So far I've used FFT to analyse the sound input but I get a lot of peaks, and notes like C o...

## Difference between original sound and microphone recorded sound [2 Articles] 0

kali...@gmail.com - Dec 7 2009
Hi, I was wondering if anyone can formalize the difference between a played audio buffer and the same audio buffer, played from a speaker and captured by a microphone. For ex...
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