Recent content by !kx!

The way it works in Matlab, above definition of St will concatenate the two arrays. So we will get roughly (4977+5063-38) 10,000 samples for the entire duration of 10s. (I further trimmed it to be of exact 10000 samples). So it is more or less like AlephZero's definition.. except that this one...

I defined it the way I did.. so that it remains differentiable over whole period of 10s.. maybe that was not needed. If you read my first post.. I just wanted to confirm that the sidebands I am getting are all that is needed to change Rt into St. I had expected transform of Rt to be just...

Do you mean that if I do a Fourier transform of a single 10Hz signal, still I'd get sidebands? Why is that? Here is the information about my plots. Using Matlab, I defined a 10Hz signal as : Ft=sin(2*pi*[0:0.001:5]*10) That is 1000 samples per second. On plotting the function...

Hi, I was wondering what would the Fourier transform of a signal like below give: s(t) = sin(2πt*10) ; t in [0s,5s] = sin(2πt*20) ; t in [5s,10s] I certainly did not expect it to give me 2 sharp peaks at frequencies 10Hz and 20Hz - because I understand that the addition of...

Thanks for the replies. If I get it correctly.. then you mean to say that the piano sound of middle-C contains all the harmonics of the fundamental frequency 261.63 Hz. But that should not be the case... since the 'C' of all the octaves are harmonics of each other. (261.63, 523.25, 1046.5...

Hi I am trying to generate tones using computer software. I generated a sine wave tone for a frequency of 261.63 Hz, corresponding to middle-C key on a keyboard/piano. But this sound produced is completely different from when I generate it on the instrument. Shouldn't all the sounds of...

ok... so I calculate the temporal coherence for a source, by the (delta)t expression you gave above... and, how spatial coherence depends on the size of the source...

It didn't quite get through my head... can someone explain in greater detail what spatial and temporal coherence mean...??

Hi all... I am just starting off with the monte carlo methods... I have done some work with self avoiding walks and ising models.. Can someone suggest some project that can be taken on as part of a Master's thesis.. thanks..

ok.. here is what I learned : magnetic field is due to a conduction current and also due to a displacement component (ampere-maxwell law).. That due to conduction current will depend upon the observer's motion w.r.t. the current. However.. this won't apply to all the magnetic fields (e.g. that...

You sure answer is C.. If we assume pulley is at rest.. by me it should be B, 240/7 N.. EDIT: And the pulley does seem at rest in image (it didn't download earlier!)

As elect_eng earlier said, that me observing the magnetic field due to a current will depend on my motion.. So, I could have said that the magnetic field, existing or not, will depend on the observer's state of motion.. But since, the magnetic field in an EM wave is not the same as that due to...

finding range shouldn't be a problem if you know initial velocity and time taken for trajectory.. but that way, you won't be able to plot the trajectory, as you require.

The problem is pretty straight forward.. First of all you should know about the quadratic equation you are talking about.. Your diagram gives you 2 points on the curve.. that should help you find the constants in your quadratic equation.. After you get the equation in complete form, with only...

I couldn't understand the problem very well. I think that with y, you mean the height above ground.. And that should make x along the ground.. what is X0?? please be more clear!