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# Discussion Groups > Comp.DSP

Comp.dsp is a worldwide Usenet news group that is used to discuss various aspects of digital signal processing.

There are 9 threads in our archives.

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## zero lag Butterworth filter 0

Im trying to implement a zero-lag butterworth Filtert as described in tha paper at http://www3.uta.edu/faculty/ricard/Grad%20Biomech/Pezzack/Robertson%20(2003)%20Design%20and%20responses%20of%20butt...

## PID Autopilot for landing 0

Hi, I remember when I was at university in a lecture on PID controllers, the lecturer mentioned a way that an autopilot can tell the aircraft is on the ground, using nothing but a PID loop with v...

## kernal density estimation function notation 0

Hi, I'm trying to implement the mean shift algorithm on page 18 of http://hal.inria.fr/docs/00/17/10/38/PDF/RR-6282.pdf . H is a diagonal matrix when you're using more then one dimension. ...

## log energy of audio frame 0

Hi, sorry to post 2 questions in the same day but Ive been searching all day and got nowhere. Im trying to compute the log energy of an audio frame. I am aware that the result of my calculatio...

## formant frequency vs. fundamental frequency 0

What exactly is the difference between the fundamental frequency of a sound and the first formant frequency? To me they look the same ...

## dimensions of multivariate gaussian 0

hello, I'm trying to construct a Gaussian Mixture model (GMM) from data with n dimensions. A multivariate Gaussian is described with: b=(1/(((2*pi)^(D/2) * sqrt(det(sigma)))) * exp(-0.5*(x...