Signal Processing Weekly Newsletter - Friday, February 27, 2015

Signal Processing newsletter

Top new questions this week: Difference between "freqz()" and "plot(abs(fft()))" in matlab I've plotted the response of a High Pass Filter x=[1 -1]; freqz(x) gave me where as the magnitude plot for the fft gave me Why are the two plots different? Both are frequency responses, then ... frequency-response digital-filters   asked by phanitej 3 votes answered by jojek 3 votes Matlab: Help in learning EKF I have AR(1) model with data samples $N=500$ that is driven by a nonlinear input $x$. THe observation $y$ is corrupted with measurement noise $v$ of zero mean. The model is $y(t) = ay(t-1) + x(t) + ... matlab filters kalman-filters estimation   asked by SKM 2 votes Is image reconstruction possible using its magnitude only? Let us take any image like Lena or cameraman. I know that when Fourier transform is applied on image,spatially global features like amplitude and phase are obtained locally. My question is whether it ... image-processing fft ifft   asked by pandu 2 votes answered by hotpaw2 2 votes Determining the point in a temporal signal when a periodic behavior begins to occur I'm a newcomer to digital signal processing, so I'm looking for some general advice and direction on this problem I have. I have a signal like that shown below. Starting around x=40000, you can see a ... signal-analysis frequency-spectrum power-spectral-density   asked by gammapoint 2 votes Algorithm to pan audio I'm looking for a way to pan the PCM audio I have. At the moment the audio is in a stereo format and I would like to pan it to the desired side (or more/less to a side). I've recently figured out how ... audio algorithms   asked by Dries 2 votes answered by Frank Zalkow 2 votes How to detect letters in an image? I have a project that requires detecting and processing letters in a given input image. I am also new to subject of image processing. There are lots of subsubjects in image processing. I believe I ... image-processing matlab matlab-cvst   asked by Bora Semiz 2 votes answered by MSalters 0 votes Efficient calculation of correlation function every N_th point I would like to calculate a long correlation function of length say, 1e6 points. I have a prior knowledge that the correlation peak will be in point k*1000. Is there an efficient way to apply this ... fft autocorrelation cross-correlation ifft   asked by Vlad Sokolik 2 votes answered by Serj 0 votes Greatest hits from previous weeks: How does a low-pass filter programmatically work? I have been working on a simple low pass filter for < 100 Hz metering in my application. But so far, I am struggling with the theory behind it all. It's cool that I got it working, but I'd really ... lowpass-filter c   asked by Niek van der Steen 2 votes answered by Matt L. 3 votes What are linear and circular convolution? I have some basic understanding of signals and convolution. As far as I know it shows the similarities of two signals. Could I get some explanation in plain English of: what are the linear and ... convolution   asked by Sturm 3 votes answered by Hilmar 1 vote Can you answer these? Phase spectrum of an image I am beginner in image processing. When I applied Fourier transform on image say Lena, Cameraman etc., I obtained magnitude and phase spectrum. I want to concentrate on phase spectrum. The phase ... image-processing fft phase   asked by pandu 1 vote non-standard error function for adaptive filter I want to create an adaptive filter. Its coefficients have this general shape: When the input signal for the filter is a sine wave, the filter behaves the desired way if the look-back window is set ... filters finite-impulse-response adaptive-algorithms   asked by MisterH 1 vote Recover signal from sum of AM and FM I have samples of a signal that contains an AM signal added to an FM signal with the same carrier frequency $f_c$. The AM signal is a sinusoid with frequency $f_{AM}$ and the FM signal is a sinusoid ... demodulation   asked by Greg Owen 1 vote

Subscribe to more Stack Exchange newsletters Unsubscribe from this newsletter or change your email preferences by visiting your subscriptions page on stackexchange.com. Questions? Comments? Let us know on our feedback site. If you no longer want to receive mail from Stack Exchange, unsubscribe from all stackexchange.com emails. Stack Exchange, Inc. 110 William St, 28th Floor, NY NY 10038 <3