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They arise naturally in Fourier analysis because we are trying to express functions (sometimes pure real functions) as sums of complex exponential. There is no way to make a real function out of complex exponential unless we add two complex conjugates. exp(j*w*t) and exp(j*<-w>*t) are complex...
femm electromagnetic
I have been using FEMM recently and I'm pretty impressed also.
There is also a somewhat active yahoo group devoted to FEMM... easy to get answers.
Re: transformer design
How to calculate the number of primary winding turns:
Assuming you have a core selected, your volts per turn on the primary determines your flux density. To use the iron efficiently, usually want to excite the core close to but not past saturation.
One annoying thing about Oppenheim and Schaffer is their switch in notation.
Their Signals book uses small omega as continuous time frequency, capital omega as discrete time frequency.
Their DSP book uses small capital omega as continuous time frequency, small omega as discrete time frequency...
difference noise distortion
Noise would typically be additive to original signal. Distortion would probably represent a chance to an original signal. So in general, we expect noise would be uncorrelated to original signal, distortion error would be highly -correlated to the original signal.
I would whole-heartedly second the recommendation about Georgia Tech.
I got my MSEE through their distance learning program without ever setting foot on campus. A video of the lectures is sent through the mail. Assignments are faxed in. Exams are proctored locally. In summary, you...
dsp processor interview questions
Yes, I have added zero's to the end of the windowed sample and taken the FFT of the whole thing. It's called zero-padding of the original signal. If you agree it improves resolution, we are in violent agreement. If you say it is "obvious", I wouldn't...
fft points to frequency
The number of points is how long your vector X is. In your case 20000. You don't have to specify N. If your vector is not a multiple of 2, then the algorithm may not be particularly fast, but should still be accurate.
- the spacing between your FFT points will be...
interview questions for digital signal processing
An even better demonstration is looking at a single frequency as in the following link::
**broken link removed**
A known 10.3hz signal with white noise is input. Bindwidth is 1hz. FFT predicts frequency as 10hz. Zero padding predicts as...
dsp processors interview questions
I did see on page 8/20 where he said it does not improve the resolution.
I will have to respectfully disagree. Zero-padding does indeed improve the frequency resolution. The DFT/FFT are "samples" of the DTFT at discrete frequencies. We get more samples...
Attached is a solution of the function that satisfies x^y=y^x using Maple
First just for info I plotted x^y
Then I defined Z = y^x-x^y
Then I substituted y=x^t into z giving
z := (x*t)^x-x^(x*t)
Then I solved for values of t that would make z=0 (t=1 would correspond to y=x).
Maple comes up...
I don't know.
The fact that you are looking for dy/dx implies that there is a functional relationship between x and y (i.e. x and y are not just a single value each).
I think what FvM said in the beginning was right.
x^y = y^x implies that y=x
which implies that dy/dx = 1
If you are...
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