scaling

Started by milad in Audio Signal Processing8 years ago 2 replies

Hi, I have a basic question regarding fixed point scaling. Suppose I have frame based DSP system and I want to scale each frame such that it...

Hi, I have a basic question regarding fixed point scaling. Suppose I have frame based DSP system and I want to scale each frame such that it is in the appropriate range for the fft module to work with. How do I compute this value from the samples of a frame? Thanks, Milad


Questions about Filtering and Note Onsets?

Started by bloodfire1004 in Audio Signal Processing8 years ago

Forgive me if I may come as ignorant but I would like to ask some questions regarding using Filter Algorithms for Note Onset Detection. 1. Is...

Forgive me if I may come as ignorant but I would like to ask some questions regarding using Filter Algorithms for Note Onset Detection. 1. Is 'Detection Function' the same as using Filters on the audio signal? Or generally, what is the difference between Detection Function, Filtering (pre-processing the signal), and Peak-Picking? 2. I've constantly heard about the Low-Pass (or High-Pass) fil...


Re: Issue implementing Energy threshold algorithm forVoice Activity Detection

Started by Jeff Brower in Audio Signal Processing8 years ago 1 reply

Vineet- > Thanks a lot for your suggestions. I will revise the algorithm and post my > findings. > > I also found another major flaw in...

Vineet- > Thanks a lot for your suggestions. I will revise the algorithm and post my > findings. > > I also found another major flaw in my code where my second for loop *for > (int j = 0; j < wL; j++)* was not setup correctly which is why i was getting > the same value as it was going over the same sample values over and over > again. > > Basically, the second for loop should be somethi


Issue implementing Energy threshold algorithm for Voice Activity Detection

Started by kash...@gmail.com in Audio Signal Processing8 years ago 3 replies

Hi all I am trying to implement the energy threshold algorithm for voice activity detection and not getting meaningful values for energy for...

Hi all I am trying to implement the energy threshold algorithm for voice activity detection and not getting meaningful values for energy for frames of size wL. wL = 1784 // about 40 ms const double decay_constant = 0.90 // some optimal value between 0 and 1 double prevrms = 1.0 // avoid DivideByZero double threshold = some optimal value after some experimentation for (int i = 0; i <


Asymmetric gaussian type function through signal filtering

Started by s068...@sms.ed.ac.uk in Audio Signal Processing8 years ago 2 replies

Hi there, i'm trying to get an asymmetric gaussian type shape that i can parameterise, i thought perhaps signal filtering might be an efficient...

Hi there, i'm trying to get an asymmetric gaussian type shape that i can parameterise, i thought perhaps signal filtering might be an efficient way to do it. Only problem is i don't know enough about filtering! So, if you take a look at: http://web.me.com/bilal.khan/diagram.png Top left is the gaussian shape we're all wonderfully familiar with, and top right is the kind of curve i'm looking...


Guitar Chord Recognition

Started by bloodfire1004 in Audio Signal Processing8 years ago 2 replies

Hi! I would like to ask questions regarding some possible algorithms for Guitar Chord recognition. Currently, what I have is that I am using...

Hi! I would like to ask questions regarding some possible algorithms for Guitar Chord recognition. Currently, what I have is that I am using 'Chroma Vectors', in which I use the results of my FFT to construct a chroma vector (of the current block) and then use compare-and-contrast of the result with actual chroma vectors containing actual chord representations (e.g. a CMajor chroma vector wo...


Detecting a short, specific waveform.....

Started by "Mark E. Skeels" in Audio Signal Processing8 years ago 5 replies

All, I am totally new to DSP's. My question is, how would you go about detecting a certain type of short waveform (couple of mSec) and...

All, I am totally new to DSP's. My question is, how would you go about detecting a certain type of short waveform (couple of mSec) and rejecting others, such as a gun shot or a snare drum hit? I'd like to be able to do it within, say, 20-30 mS for use as the start of a timing function. Can anyone steer me to some sort of resource that can help me learn a bit more about this? ...


Real FFT implementation

Started by fezi...@gmail.com in Audio Signal Processing8 years ago 7 replies

Hi everyone, I need assistance in computing FFT of real valued data. Googling, i found that sorensen has developed and implemented an...

Hi everyone, I need assistance in computing FFT of real valued data. Googling, i found that sorensen has developed and implemented an algorithm. But i couldnt find the steps to code it. Moreover above said algorithm is decimation in time. My requirement is decimation in frequency. Any help(c code\algorithm) is deeply appreciated! Thanks!


Re:Constant Q Graphic Equalizers

Started by Jon Lark in Audio Signal Processing8 years ago 1 reply

Try the article at http://www.rane.com/pdf/constanq.pdf Regards, Jon

Try the article at http://www.rane.com/pdf/constanq.pdf Regards, Jon


Phaser effect realization

Started by cris...@gmail.com in Audio Signal Processing8 years ago 6 replies

Hi! I'm developing a digital phaser effect based on several docs I found on the net and books. One of the most detailed resources...

Hi! I'm developing a digital phaser effect based on several docs I found on the net and books. One of the most detailed resources is: http://www.onkartgromt.no/index.php/resources/effects-explained/56-phaser My question is about FEEDBACK: Please look at the first block diagram on the link above. There are several all pass filters connected in series with a feedback. Well, suppose this al...


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