0
votes
0answers
5 views

Do all Harmonics of a periodic sound start from a 0 base

I've been thinking about additive synthesis and I'm wondering if all sounds begin at (theoretically) phase 0?
0
votes
0answers
5 views

Matching headphone responses

First post, and this isn't my field of study, but I'm giving this a go anyway: My latest endeavor is to use a bit of DSP magic to match up various pairs of headphones, at least in terms of their ...
1
vote
1answer
27 views

Does scaling property imply superposition?

For a system to be linear,it follow the principles of scaling and superposition.Does scaling imply superposition?If so why are two different conditions given for linearity?If not can u specify an ...
0
votes
0answers
8 views

what is the preffered data and FFT length for blackman harris window for improving Accuracy due to ENBW Consideration of window?

for Rectangular window if data length is 1K then FFT Length Should be 1K FFT only because ENBW of rectangualr window is 1.0 but for Minimum 4-Sanple BlackmannHarris window is 2.0. so for improving ...
0
votes
1answer
38 views

Forward and backward filtering

I have an input sequence $x(n)$ and impulse sequence \begin{equation} h(n) = \begin{cases} 0 & \quad \text{when } n = 0 \\ .239052 & \quad \text{when } n = 1 \\1.3357\exp(-0.650286n) & ...
0
votes
0answers
9 views

Which anatomical model to use as “ground truth” for validating an MRI segmentation method?

I am research in brain segmentation task that classify a brain in to 3 classes : White Matter, Gray Matter and CSF. To validate my method, I used Dice Coefficient that compare my result and ground ...
0
votes
1answer
18 views

Python bandpass filter - singular matrix error

I've been trying to design a bandpass filter using scipy but I keep getting a LinAlg Singular Matrix error. I read that a singular matrix is one that is not invertable, but I'm not sure how that error ...
0
votes
0answers
20 views

Help needed with the integral of an infinite series [migrated]

Can you please help me with the integral of this series? I came across it in a signal processing paper and haven't been able to figure out the solution myself. $$ ...
0
votes
2answers
36 views

System response: LTI system for $x[n] = \sin(\frac{\pi n}{4})$

Consider the LTI system with frequency response $$H(e^{j\omega}) = \frac{1-e^{-j2\omega}}{1+\frac{1}{2}e^{-j4 \omega}}, -\pi < \omega < \pi$$ Determine the output $y[n]$ for all $n$ if the input ...
1
vote
0answers
18 views

Spatial resampling, how to smooth?

Sorry if this is not the right forum. Having a velocity grid in which a wave propagates, and given a certain spatial sampling of the grid, what kind of smoothing/interpolation should be used if the ...
0
votes
0answers
10 views

Getting image intersection area perentage

i have two flying robot. And they are flying at same height (nearly) and they are looking same direction and pose. Both of them have same camera and the cameras looking to floor. When the robots are ...
0
votes
0answers
22 views

Which MIMO scheme is implemented in a modem?

Hope I phrased the title in a sense. I'm trying to get more knowledge on MIMO , so I read a few paper and i've understood that MIMO system can provide 3 types of improvements : array gain, diversity ...
0
votes
0answers
33 views

Least Square Channel Estimation Technique

A communications channel is modeled by a finite-impulse-response (FIR) filter: $$y[n] = Hs[n] + w[n]$$ where $H$ is the channel coefficients, $s$ is the binary source and $w$ is AWGN A least Square ...
0
votes
0answers
23 views

Multiply BLIT by Transfer Function

I think what I'm doing is a BLIT. If it's not, let me know. I found this blog post which was very helpful in figuring out how to simplify a Fourier Series. The most important concept I got from ...
0
votes
2answers
76 views

Check if a filter is IIR or FIR

I have the following equation: $$H(z) = \frac{z^3+5z^2+3z+1}{10z^3}$$ I want to find out whether if its IIR or FIR. Here is the steps I have gone so far: $$H(z) = ...
0
votes
0answers
28 views

How to use wavelet decomposition for feature extraction (of fMRI images)?

I have a dataset consisting of fMRI images (from mice) which are divided into 4 groups (different drug dose levels applied). Each fMRI image is 4D, that means each voxel is a time series. For each ...
1
vote
0answers
26 views

Image segmentation: Grabcut versus Level-set

Checking the literature about image segmentation, if I am not wrong, there are two main approaches: Variational approach e.g. level-set optimization in Chan-Vese Combinatorial approach e.g. using ...
0
votes
0answers
14 views

2D Log-Gabor implementation in C++?

Is there anywhere out there a 2D log-gabor implemenataion in C++? I have been searching all day and I just couldn't find a normal implementation. I just want to test the filter in my prgoram and I ...
0
votes
1answer
49 views

Any good C# library for signal processing?

Does anyone can link me to a good C# DSP library? I saw some good C++ libraries but I don't have much with C++. Is there any way to wrap them ? My main porpuse is to apply some filters(Lowpass, ...
0
votes
0answers
18 views

WiFi and the sampling rate of spectrum analyzer

I'm trying to understand the correlation between RF analyzesrs and WiFi. Looking at the device's datasheet I see that it has a sample rate of (max.) 100msec. [to my understanding, the device can ...
1
vote
2answers
39 views

applying single pole filter to simple signal

How to apply single pole filter to simple signal fs = 500; ts = 1/fs; t = 0:ts:1-ts; fc = 50; S = cos(2*pi*fc*t);
0
votes
0answers
14 views

Zero Cross Rating synchronization

I send some pure sinuses that are representing bits. I found that after some bits the system is losing synchromization so for example: if I want to catch a 13Khz sinus I get 12.8K. I use ZCR to ...
1
vote
1answer
28 views

Invariances in Neural Networks

I have a question about invariances in neural networks. In general, neural nets with enough layers can learn arbitrarily complicated nonlinear functions. Therefore, it's not hard to understand how ...
0
votes
0answers
18 views

Correlation of an image in the Fourier Domain

I have been reading up on correlation in the frequency domain, and I just had two questions which I could not find in the book I was reading nor online: [1] So correlation is the same as a normalized ...
0
votes
2answers
102 views

FIR filters always linear?

Are Finite Impulse Response filters always linear? I looked at https://en.wikipedia.org/wiki/Nonlinear_filter and its says that if a filter does not obey linearity, it is non-linear filter. Thats ...
0
votes
0answers
9 views

Template matching for object recognition and pose estimation

I am currently reading a series of articles from Hinterstoisser about template-based real-time detection of texture-less objects and estimation of their pose. It is the series of articles that ...
1
vote
1answer
26 views

What does “A Target with Zero Doppler” Mean?

I have seen several references to target at zero Doppler and some simulations that command users to place a target at zero Doppler. I know that when a target is flying tangential to the signal the ...
0
votes
0answers
45 views

What is Single pole filter?

Can anybody tell me why do we use single pole filter? And may be an example of Single pole filter in matlab. Good literature recommendations are also welcomed.Moreover, that would be good if anyone ...
0
votes
0answers
12 views

Time and phase estimation in OQPSK using ML criterion

Let me first make an introduction to the problem by stating some intermediate results: An OQPSK signal has the general form: $$\\\tilde{s}(t)=\sum\limits_{i}\tilde{a}_i ...
-2
votes
0answers
16 views

How to generat figure on axis? [on hold]

I have a sensor placement optimisation problem to solve. hence I need to draw few structures and optimise the sensor placement for the same. can you provide me with a matlab code such that when I ...
0
votes
1answer
25 views

How can I extract a sinusoid from a very noisy signal for computing the phase shift?

I have done some measurements and I got two very noisy signals. I want to extract a certain sinusoid from the signals and I want to compute the phase shift between them. I made some simulations and I ...
0
votes
0answers
8 views

General registration of images of two cameras

Suppose I have two cameras (c1 and c2) that are mounted to a device. The cameras observe an even surface of this device, where an object will be placed. The device itself can move, the cameras should ...
0
votes
0answers
4 views

Camera calibration vs. registration

Suppose I have two cameras, c1 and c2 that are securely installed and do not move. What I want is a matrix T, that takes a pixel of an image from camera c1 and calculates the according pixel in an ...
0
votes
1answer
34 views

DFT: Basis functions and Significance of dividing frequency by Sample length

A time domain signal can be decomposed into sinusoids which are based on basis functions. For a N sampled input, a cosine basis function is defined as: $$C_k[i] = \cos\left[\dfrac{2\pi k ...
0
votes
0answers
19 views

Estimation of latency for music played through a speaker

I need to estimate the latency for a music source that is played through stereo speakers but also transmitted wireless to the recipient. The music needs to be synced at the recipient by using a ...
0
votes
1answer
32 views

Advice on autocorrelation via FFT

I have been creating an application in Java that transforms an audio signal and writes it to a midi file. At first I tried using autocorrelation to find the fundamental frequency. However, I have ...
0
votes
0answers
11 views

Matlab fspecial disk: Algorithm reference or algorithm logic

I'm trying to figure out how the fspecial function works to create a discrete disk in Matlab. This function is an averaging filter that arises in an image processing environment. The Matlab algorithm ...
2
votes
2answers
42 views

Advantage of using FIR Polyphase Decimator over just computing FIR output every D samples

Let's say you want to implement an FIR filter $h[k]$ with $L$ taps and downsample the output: $v[k] = x[k] * h[k]$ $y[m] = v[kD]$ The "naive" way would be to compute all the samples of $v[k]$, then ...
-1
votes
0answers
7 views

Resampling data from impact testing

I have asynchronous data from two different data acquisition systems (one for the impact hammer and the other from accelerometers). I am using pwelch and cpsd in matlab to calculate the FRFs however ...
-1
votes
0answers
21 views

Sound Characterization [on hold]

For the last 6-7 months I have been working on a small project attempting to get sound-recognition to work on a raspberry pi in real time. My last iteration of sound recognition was centered around ...
-1
votes
0answers
8 views

How to estimate the power spectrum in yule walker method?

I'm trying to estimate the power spectrum using yule walker method in C++ . After finding the coefficient ,how to estimate the power spectrum ? Example: I got the coefficient up to 30 ...
0
votes
0answers
17 views

Difference between a calculated envelope and the actual magnitude envelope?

The magnitude of a given signal is also an envelope (?), but usually envelope is used to refer to computed techniques (https://en.wikipedia.org/wiki/Envelope_%28mathematics%29) for finding an envelope ...
0
votes
2answers
31 views

Frequency response of a (rectangular) integrator

A very simple question which can't really figure out: I have a simple discrete time rectangular integrator with Z transform H(z) = 1/(1-Z^(-1)) Plotting the frequency response with Matlab using ...
0
votes
1answer
31 views

Is real-time Hilbert envelope feasible?

Is the Hilbert envelope (analytic signal) feasible to be calculated in audio frames/blocks in real-time, when using FFT with windowing. What I'm specifically concerned with is that how does it not ...
-1
votes
0answers
8 views

If accept Incoming call which kind of acknowledgement go to the server.? [on hold]

In mobile communication, If accept Incoming call which kind of acknowledgement go to the server.? can i change the acknowledgement..?
-1
votes
1answer
31 views

simulating noise with Yuler and burg

I want to simulate short term white noise with Yuler and Burg. It's said that it can give better results than Gauss-Markov. The problem is that each time the series diverge. Do you think that I made ...
0
votes
1answer
23 views

Defining an average in time for a density in time

I'm reading the text book "Time-Frequency Analysis" by Leon Cohen and I've made my way through a decent portion. There is however a conceptual issue I keep coming back to. The book states: If we ...
0
votes
0answers
20 views

Noise reduction on wave file

I have created a simple plot of waveforms using matplotlib of 2 wave files on python. Here is the code: ...
-1
votes
0answers
20 views

probability distribution of complex Gaussian column vector and conditional probability of complex Gaussian column vector

I have column vector $\vec r=[r_1\ r_2]^T$. $$\vec r =hA\vec s +\vec n$$ where $h$ is a complex number , $\vec n \sim \mathcal{C} \mathcal{N}(\begin{bmatrix} 0 \\ 0 ...
1
vote
0answers
39 views

Translation invariance in max-pooling and cascading with convolutional layer

I am reading through this page about convolutional neural networks and I am confused about the part about max-pooling (downsampling a signal/image with the maximum value in a block). Apparently, one ...

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