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1answer
28 views

Circular Convolution of h(n)*x(n)

So I understand how Convolution works but Circular convolution seems a bit messy to me, all the examples seems to have even series of number like h(n)={1,2,3,4} & x(n)={1,2,3,4} and they are all ...
-1
votes
0answers
30 views

Is this a DC offset problem or an aliasinge effect?

First of all, please be gentile it I have very little experience with signal processing. Any way, I am trying to decode a RF signal between two RF boards.... but the signal I am receiving is a little ...
1
vote
1answer
30 views

Difference b/w freqz and fft

Since both fft ,freqz are used for finding the frequency response of digital filters. the frequency response using freqz function is given below and frequency response using fft function is it ...
0
votes
2answers
28 views

Calculate Min/Max value of multiple sine waves added together

So I feel like this should be possible, I'm just not sure how to do it. Let's say I'm generating a signal with a sample rate of 10K samples/second. Then let's say my signal is comprised of X number of ...
1
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0answers
39 views

How to extract text from a scanned document?

The task I am facing is extraction of rotated text (any angle) from a scanned image(attached Image). The image contains a blue sticker on it and need means in extracting the text (printed text) from ...
2
votes
1answer
45 views

How to simplify this sequence

So I had this question (f) at my last exam that I failed and I'm now studying for my re-exam, the problem is that I still don't know what the answer is supposed to be in this question (f): Do you ...
1
vote
0answers
12 views

GnuRadio: Clock Recovery MM: imu out of bounds

I have created a flowgraph, based on an example of Michael Ossmann, which takes in a signal, and should output bits. I need to use the clock recovery MM block, which I do not fully understand yet. ...
2
votes
1answer
42 views

Per Window Normalization

I have PPG signal that should be normalized, with offline processing I'd just do $z$-normalization, $$ \displaystyle \frac{x- \mu_x}{\sigma_x} \quad \text{where } x \text{ is the signal.} $$ The ...
2
votes
1answer
46 views

Time-Frquency Resolution issues

While Im studying wavelet transform, I have this questions in my mind which can't find it's answer: I understand that when we take longer time windows and take the fourier transform we would suffer ...
0
votes
0answers
19 views

What is a Thresh filter?

I was looking at this site and saw the term. While I'm a bit familiar with some DSP terminology, I have never heard of this before. Google did not really help at all. From what the site explores, it ...
0
votes
0answers
6 views

Python MNE - reading EEG data from array

I have EEG data that comes in the form of a 3D numpy array (epoch * channel * timepoint). timepoint is a 256 element array containing each sampled timepoint (1s total, at 256Hz). epoch is an ...
1
vote
3answers
75 views

detrending in real time

I have a certain signal that has a linear trend that should be removed. The problem is that the signal needs to be processed in real time(sampling rate is 20Hz). If I only apply the detrending per ...
0
votes
1answer
20 views

adding phase noise in signal thorugh freuquency

I want to implement a simple signal for phase noise. According to my supervisor, i shoud be adding phase noise in the frquency. This is my signal. ...
0
votes
0answers
18 views

Variation of Pulse width with center frequency in Pulse Compression technique

Assume a chirp with BW = 1 Hz (frequency range 0-1 Hz) for a period of 700 sec. The pulse compression technique (obtained through auto correlation function) applied on the chirp generates a pulse ...
0
votes
0answers
20 views

Figuring out Signal to Noise Ratio of Spectral data?

I have some Raman spectral data of a chemical: Each spectrum consist of multiple tuples of (wavenumber, intensity) I have multiple instances of 1. taken with ...
0
votes
0answers
13 views

Radar Waveforms Simulation

I am looking for a simulation in any software language, preferably Matlab, that shows the steps from generating the radar signal or waveform (chirp, Barker Code) to modulation, and transmission by the ...
0
votes
0answers
11 views

What types are Radar Chirp and Barker Code Signals

I would like to know if the radar chirp signal and the Barker coded signals are analog or digital before modulating the carrier. In other words, are the radar signals getting to the antenna analog or ...
1
vote
2answers
51 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
1answer
39 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 ...
-1
votes
1answer
32 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 ...
-1
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0answers
22 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 ...
0
votes
0answers
27 views

Binary FSK optimal detection rule

Let us consider BFSK modulation with symbols $\in {{1,2}}$. For symbol m the transmitter sends $s_m(t)=\sqrt{P\over T} e^{j2\pi f_mt}$ where $m=1,2$ and $f_m$ is symbol's $m$ carrier frequency. The ...
0
votes
1answer
49 views

Real and complex low pass equivalent of band-pass signal

A real band-pass signal $s(t)$ with center frequency $f_c$ can always be represented as $$ s(t) = A(t) \cos(2\pi f_c t) $$ where $A(t)$ is real and can be viewed as amplitude. Also $$ s(t) = ...
0
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0answers
29 views

BFSK modulation what signal the transmitter actually sends?

I am trying to understand how modulation with carriers works(transmission part). I will express my question in terms of BFSK for simplicity. Let us condiser BFSK modulation with symbols {1,2}. Then ...
0
votes
0answers
29 views

noise in signal

I am trying to add phase noise in signal. However, when i see the graph in frequency domain the spectrum is not broading. Can anyone tell me what mistake i am making? ...
0
votes
2answers
35 views

How to calculate the bandwidth of a continuous signal?

Can someone please explain how to compute the bandwidth of a signal? Like why the bandwidth of $5\sin(2t)$ is $0$ and of $\sin(2t) + \sin(3t)$ is $1$? Thanks.
0
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1answer
46 views

separating stationary and non stationary parts of univariate signal

Does anyone know if there is a procedure as to separate the stationary and non stationary parts of a univariate signal. I have seen signal source separation and blind separation algorithms (all of ...
0
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0answers
34 views

Detailed Analysis of Phase Delay of an Audio Signal

I write this question as a new reference point because it is difficult to find something exhaustive regarding this topic. I'm talking about the calculus and interpretation of the phase delay of a ...
0
votes
0answers
39 views

Signal reconstruction in FMCW radar

I am doing fmcw radar simulation. I have an output of mixer and from that I want to reconstruct the amplitude and phase of the signal. Therefore, I am taking hilbert transform and by the ...
0
votes
1answer
22 views

Bandwidth of a trimmed sinus wave

I generate a sinus which duration is 15ms and frequeuncy of 13KHz. Is its bandwidth is (1/15ms) ? Or in other words, BW = 66.6Hz? I ask that because I have two freqs in my system: 13K & 13.1K. I ...
0
votes
0answers
18 views

Find similarity rating in trajectories

I've got trajectories encoded in black and white. These are stored in a matrix with dimensions 150x150 (i.e. black = 1, white = 0). An example of two trajectories below (plotted): My objective is ...
0
votes
0answers
14 views

Cross spectrum using `cpsd` (matlab) of 2D matrices

I'm struggling with cpsd for 2D matrices. In my test, I've generated two 100x100 matrices (sine waves) s1 and ...
0
votes
0answers
33 views

Generating Wavelet family matrixes

We have unnormalized Haar matrix which, is for example, H4=[1 1 1 1;1 1 -1 -1;1 -1 0 0;0 0 1 -1] After normalizing it, we use for haar transform. I know how to ...
0
votes
2answers
95 views

Interpreting the FFT results of a structural vibration problem

System: Cantilever beam type models, with an accelerometer on the end. The beam base is excited at various frequencies in harmonic fashion on a shake table. This results in vibration in the beam. The ...
2
votes
3answers
91 views

Calculate and interpret the instantaneous frequency

I'm new to the principle of calculating the instantaneous frequency, and came up with a lot of questions on it. You find them all in a bullet-point list at the end of this text. The text might be a ...
0
votes
0answers
15 views

Received signal power when using multiple transmitters

If I have a two transmitter and one receiver system, with the transmitted power being $P_1 dBm$ for $Tx_1$ and $P_2 dBm$ for $Tx_2$. The signals from the two transmitters are added at the receiver ...
0
votes
1answer
32 views

Condition for optimal value to be the average

In many single parameter estimation process average is the optimal. Can anyone tell under what condition average is optimal? For example is average optimal if the data is iid, Gaussian or something ...
0
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0answers
18 views

Effect of pathloss on signal power

Consider I have two transmitters $tx_1$ and $tx_2$ at say a distance of $d_1=5\text{ m}$ and $d_2 = 15\text{ m}$ respectively from a receiver. Now, if I consider the effect of path loss in such a ...
0
votes
3answers
48 views

Delay signal according to normal distribution

I am trying to delay a signal by a certain number of samples. This certain number, I would like to generate using a random normal distribution in Matlab. I am using the following for generating the ...
0
votes
0answers
46 views

Velocity from acceleration data

I have an acceleration data from accelerometers. I want to get velocity from the data by integrate it using matlab. Here my coding :- ...
0
votes
0answers
20 views

What is instantaneous bandwidth of an LFM signal?

What is instantaneous bandwidth of an LFM signal? I know the meaning and calculation of instantaneous frequency of LFM signal and also the meaning of the sweep bandwidth. But I fail to understand ...
0
votes
1answer
32 views

What is the right algorithm to detect segmentations of a line chart?

To be concrete, given 2D numerical data as is shown as line plots below. There are peaks on a background average movement (with small vibrations). We want to find the values of pairs (x1, x2) if those ...
0
votes
0answers
27 views

Getting better results from the Lomb Periodogram of a time series

Two times series were simulated, one with a period of 100 and the other with periods of 20, 40, and 60, for example: ...
1
vote
1answer
66 views

Expected value of signals

If I have two signals $x$ and $y$ and this expression $E\{x[n]y[n-k]\}$, what is the expected value of the product? I have a basic understanding of EV based on probability, such as ...
1
vote
2answers
161 views

relation between luminance and eigen values of an image

There are some research papers in the literature which apply Singular Value Decomposition (SVD) on an image to decompose the image matrix into U, ...
1
vote
1answer
69 views

What is difference between outputs of Fourier transform and Fourier series of a periodic square waveform?

We can use Fourier transform of an aperiodic signal and Fourier series of periodic signal. But we can use Fourier transform formula for periodic function also. Now, let us consider a periodic square ...
0
votes
0answers
25 views

How to detect impulse noises in audio recording?

How do you detect impulse noises in audio recordings of speech? By "impulse noise" I am thinking about noises like: Typing on a keyboard A door slamming Somebody bumping into a table Tapping on a ...
0
votes
1answer
31 views

Shift a signal by a given number of samples

Is shifting a signal by a given number of samples, say $n$ samples, the same as the following in matlab: signal(n:end) instead of signal(1:end). That is, if the size of $signal$ is 200x1, does it ...
0
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0answers
18 views

how do we know that the AR model equation obtained in s-domain or z-domain?

i have obtained AR(9) model equation from time domain analysis. but how do i know the equation obtained whether in s-domain or z-domain? because the analysis for s-domain and z-domain is different. i ...
0
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0answers
27 views

Can we extract phase from higher scales within the CWT?

I have found that I can extract phase from scales higher than those located at the ridge peak of the CWT. I should point out that I'm using the analytic signal and a real wavelet. I find the ridge ...