## Top new questions this week:

### How can I build something, like actual implementations of all these things I am learning in signal processing?

I am an undergraduate electronics engineering student taking a signal processing course this semester. I have learned a lot of theoretical things in my lectures, such as how to shift or fold a signal, ...

teaching
 asked by Koustubh Jain Score of 14
 answered by Knut Inge Score of 11

### For which values of step size is LMS filter stable?

For which values of step size $\alpha$ is LMS filter stable? I Wikipedia information on this question is incorrect. For data sampled from zero-centered Gaussian in $d$-dimensions with identity ...

 asked by Yaroslav Bulatov Score of 4

### Inverting transformation $\displaystyle m(t)=\sum_{i=1}^d x(i)^t$

Suppose there's a vector of $d$ of positive numbers $x(1),\ldots,x(d)$ which I need to obtain from a vector of $d$ derived quantities $m(t_1),\ldots,m(t_d)$ where $\{t_i\}$ is some conveniently chosen ...

z-transform laplace-transform
 asked by Yaroslav Bulatov Score of 3

### What is the reason the Kronecker delta function is noted this way in DSP?

I'm trying to make sense of different notations used in DSP. This is sometimes quite hard since notation brackets like in x[n] are used both to denote a single value or a sequence. In mathematics, the ...

dirac-delta-impulse notation
 asked by mins Score of 3
 answered by Matt L. Score of 4

### Is adding a mean point between every two points a valid way of upsampling?

Suppose we need to double the sampling rate of an audio signal. Is adding a mean point between every two points a valid way of upsampling? If no, then why not? For example, in images, pixels may be ...

audio audio-processing resampling superresolution upsampling
 asked by Ritesh Singh Score of 3
 answered by Justme Score of 7

### How do noise-canceling headphones cancel out white noise, which is unpredictable in nature?

From what I know noise-canceling headphones generate sound waves that are 180° out of phase with the ambient noise. I understand that they are not effective at canceling out sudden and unpredictable ...

noise-cancellation
 asked by mdatsev Score of 2
 answered by Hilmar Score of 2

### Correct Windowing Effect at Amplitude Scale

I am trying verify the noise floor returned by Matlab sinad(). I am able to get the results matching by summing power spectrum density with $\frac{f_\text{s}}{N}$. ...

 asked by John L Score of 2
 answered by OverLordGoldDragon Score of 1

## Greatest hits from previous weeks:

### "River" detection in text

Over on the TeX stackexchange, we have been discussing how to detect "rivers" in paragraphs in this question. In this context, rivers are bands of white space that result from accidental alignment ...

image-processing matlab python
 asked by Lev Bishop Score of 186
 answered by Jonas Score of 138

### Meaning of Real and Imaginary part of Fourier Transform of a signal

Say $f$ is a signal of time $t$, $F$ its Fourier transform of the variable $v$. It is known that in polar coordinate, $|F(v)|$ tells us how much the frequency $v$ is present over the signal, and \$Arg(...

fourier-transform
 asked by user2682877 Score of 19
 answered by Matt L. Score of 19

### What is the difference between convolution and cross-correlation?

I've found on multiple sites that convolution and cross-correlation are similar (including the tag wiki for convolution), but I didn't find anywhere how they differ. What is the difference between ...

convolution autocorrelation cross-correlation
 asked by Mien Score of 55
 answered by Jason R Score of 47

### Difference between discrete time fourier transform and discrete fourier transform

I have read many articles about DTFT and DFT but am not able to discern the difference between the two except for a few visible things like DTFT goes till infinity while DFT is only till N-1. Can ...

discrete-signals fourier-transform
 asked by BaluRaman Score of 41
 answered by Deve Score of 22

### Understanding the Matched Filter

I have a question about matched filtering. Does the matched filter maximise the SNR at the moment of decision only? As far as I understand, if you put, say, NRZ through a matched filter, the SNR ...

filters digital-communications matched-filter
 asked by user968243 Score of 37
 answered by Dilip Sarwate Score of 61

### What is the difference between phase delay and group delay?

I'm studying some DSP and I'm having trouble understanding the difference between phase delay and group delay. It seems to me that they both measure the delay time of sinusoids passed through a ...

filters audio phase group-delay
 asked by dB' Score of 54
 answered by Hilmar Score of 26

### what's the pass band ripple and stop band attenuation of a digital filter?

Hi i'm a beginner in signal processing i want to know what'sthe pass band ripple and stop band attenuation of a digital filter ? Thanks.

filters digital
 asked by root Score of 5
 answered by Dan Boschen Score of 9

## Can you answer this question?

### Why am I not getting proper values of power(Px) and energy(Ex) signal as per book?

I am considering an energy signal in MATLAB as I am going through the book Signals and Systems Laboratory with MATLAB by Alex Palamides. My Matlab code is below: ...

matlab signal-power signal-energy
 asked by lks Score of 2
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