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Possible new faster algorithms for FFT of 3^n and 6^n sizes.
Hello, I think I may have discovered new faster algorithms for doing FFTs on vectors of length 3^n and 6^n. Complete source code plus a derivation may be found at: Basically, the trick is to use the first sixth root of unity as a complex axis instead of the im... 6 Jan 2010 08:29
extended kalman filter going berserk
bump. Still having problems... I discovered that the reason for the high values is that the covariance matrix goes to almost zero. How can I prevent this? Hagai. ... 6 Jan 2010 08:28
ifft after modifying a signal
Hi I have a signal in the time domain, and I need to perform some changes in the spectrum of magnitude of such signal, and then I want to reconstruct the signal and take it to the time domain again. The problem I have is that i cannot get the signal in the time domain after the modifications. When I take ifft, I... 3 Jan 2010 21:33
PhD s from Convolution Integral Thread
It got too long and I just couldn't spend the time to read all the posts. So, if this is redundant then .. OK: 1) Folks with common sense and experience are invaluable. 2) Folks with an ability to focus on the real issue are invaluable. 3) Folks who can figure something out quickly and put what they know to u... 7 Jan 2010 15:47
Inverting bits
suppose if am having a clock frequency of 60 Mhz and i want to invert every third bit that is inverting signal at 20Mhz . what could be the best solution in terms of least number of storage bits . i think a counter can be used but how many storage bits we will count it? any other solutions ... 6 Jan 2010 08:28
how to start your reserch
if you want to start you phd reserch which way you prefer 1_ understanding the subject first by reading books or directly start reading conference and papers to know which new idea you can find about your subject from where you prefer to select papers from for example IEEE or .........?? if you want to se... 3 Jan 2010 21:33
low-cost audio waveform display doubles as space heater
For those of you who on a budget who need to visualize audio waveforms, check out the following link. All we need to do is figure out how to make the equivalent of a horizontal sync circuit. Might want to check with your local fire department first ... Happ... 1 Jan 2010 20:38
Viterbi Decoder
I want to know that for a particular viterbi decoder e.g for 1/2,7 type ,with traceback depth of 48, if input data frame contains 2000 bits ,IS it possible to correct only upto 4 errors in this data stream and is there any relation between error correcting capability and location of these errors in the data p... 2 Jan 2010 21:33
Goertzel Algorithm: Help Needed
Hi I am trying to use the goertzel algo to make a real time audio spectrum analyzer using a PIC controller. I have started out by trying it on Matlab, but i am getting this problem: The high frequency peaks in the power graph are much smaller than the low frequency peaks. For example, the peak at 60Hz is, say ... 6 Jan 2010 08:29
BPSK demodulation
Hi all!! I have implemented BPSK modulation with DSK 6713.I'm writting a program to implement BPSK modulation and demodulation on the same Kit DSK 6713, but it doesn't run. Can we implement BPSK modulation and demodulatio on the same Kit DSP?. I wil post my source code later! By the way! I also have a project about QP... 30 Dec 2009 10:53
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