All Questions

0
votes
1answer
11 views

Transfer function: from poles and zeros to polynomial coefficients

I understand how this transfer function was solved except I don't know how to get the 0.87. Any help would be appreciated.
0
votes
1answer
12 views

Scale Image by using FFT

Can we change the scale of image by using FFT? I mean, how should i do process on frequency domain of image to upscale or downscale the orginal image? The other question of mine is that how can ...
0
votes
0answers
7 views

Show and Tell: Lessons learned from the 2015 MSCOCO Image Captioning Challenge

I am looking through the source code of this paper in tensorflow.There are two phrases of training the parameters.I want to know why two phrases?
0
votes
1answer
25 views

How to uniquely identify phase difference between harmonics?

Let's say I have a multi-frequencies signal of 440Hz and 880Hz, slightly out of phase. I can take a chunk of the signal and calculate phase difference of the two frequencies with FFT bins. However, ...
0
votes
0answers
14 views

BER performance over fading channel

Suppose the channel model is a frequency-nonselective Rayleigh fading multipath channel. The received signal is expressed as \begin{equation} r(t) = \sum_{l=1}^{L}\alpha_l s(t - \tau_l) + n(t) \end{...
0
votes
1answer
9 views

How to implement discrete extended kalman filter in matlab

I have a nonlinear system, and I need to use the extended kalman filter to estimate it. I know I need the jacobian, but once I get that, is everything else the same as the normal kalman filter? I ...
0
votes
1answer
13 views

DTFT of a time-domain signal modulated by $(-1)^n$

Given $$ h[n]\leftrightarrow H(e^{j\omega})$$ How do I prove that $$\sum_{n}^{ }(-1)^nh[n]e^{\frac{j\omega n}{2}}=H(e^{j\frac{\omega+2\pi}{2}})$$ Is there some property I can apply directly? Or is ...
0
votes
1answer
16 views

Discrete signal testing for periodicity

How would one go about determining if the following discrete time signal x[n] is periodic, and if it is, determine its fundamental period? I understand that the ...
1
vote
0answers
17 views

Advances in Blind SNR estimation beyond $M_2M_4$

In Pauluzzi and Beaulieu, various SNR estimation methods are compared. Among the blind methods considered, the $M_2M_4$ estimator seemed to be unambiguously the best. However, it has been shown that ...
0
votes
0answers
14 views

Converting filterbank amplitudes to formant filters

I have a filterbank that I used to make a vocoder. It is a series of parallel bandpass filters configured to cover the spectrum in an exponential fashion. This works well and the results are exactly ...
2
votes
0answers
9 views

Proof that the Lomb-Scargle periodogram reduces to the classical periodogram when the sample is equally spaced

If we have a equally spaced sample, we can use the conventionally used periodogram: $$P_x(\omega) = \frac{1}{N_0}\left[\left(\sum_j X_j\cos \omega t_j\right)^2+\left(\sum_j X_j\sin \omega t_j\right)^...
1
vote
1answer
28 views

CT corrupted by Poisson noise, weighted least squares

I've trained a convolutional neural network to recognize ellipses. I took random generated ellipses as ground truth images and applied radon and inverse radon transform for the noisy images. Now I ...
1
vote
1answer
21 views

How to sketch a frequency spectrum for an AM signal?

So I have an AM signal, given by: $$v(t)=50\cos(\pi 10^{6} t )+ 20\sin(\pi 10^3t)\cos(\pi 10^6 t)$$ I was asked to sketch the spectrum of the signal obtained, so I found the fourier transform of it, ...
3
votes
1answer
21 views

Image Processing/ Computer Vision: How is separability of filters implemented?

I am trying to convince myself that a separable 2D filter can be implemented via two 1D filters. So, I took the example of following Sobel filter: $1/8\begin{bmatrix}-1&0&1\\-2&0&2\\-...
0
votes
0answers
5 views

CIE-Lab changes on Light intensity changes

I am planning to use CIE-Lab color model for an image segmentaion method. If the light intensity of sun, some led source changes on the objectm then does it affects the a and b value of the data ...
1
vote
1answer
34 views

Single-pole IIR low-pass filter - which is the correct formula for the decay coefficient?

A single-pole IIR low-pass filter can be defined in discrete time as y += a * (x - y), where y is the output sample, ...
0
votes
0answers
21 views

Realistic data technical analysis [on hold]

Suppose that I have some data like this: How can I algorithmically identify marked parts. Please guide me about some best practice(s) to identify marked parts (where the pattern changes somehow) ...
0
votes
0answers
17 views

Simulating a Random Telegraphic Signal in MATLAB [on hold]

If I had to simulate an RTS in MATLAB by simulating a Poisson process, how would I go about doing it?
-1
votes
1answer
30 views

price of dsp kit TMS320c6678 [on hold]

What is the meaning of highlighted price in attached fig? Does it means 120 dollar per unit price?Figure
2
votes
1answer
22 views

Seperation of wideband and narrowband - Adaptive Filter

I have the following diagram for the adaptive seperation of a narrowband and wideband signal using LMS algorithim, The way it was explained to us was that "The narrowband signal is correlatied over ...
0
votes
1answer
13 views

Bias instability in Gyroscopes : AVER / ADEV

I am attempting to implement allan variance to determine the amount of bias that is shown in my IMU's gyroscope ( BMI160 ). I am doing this with the following formula, that was captured in the ...
1
vote
2answers
60 views

Using Fast Fourier Transform to determine musical notes

Hi guys i am doing a course in Digital Filters and Spectral analysis. We are given a coursework/homework, and I have absolutely no idea what to do with it. I come from Maths background, never done any ...
0
votes
0answers
26 views

Phase shift of multitone sinusoids

How to apply phase shift for a multitone complex signal? Say we have the following signal $$x(t) = \sum_{i=1}^Me^{j(2\pi f_it+\theta_i)}.$$ I want to apply an arbitrary phase shift $\phi_i$ for each ...
0
votes
0answers
39 views

DFT Question, Im stuck [on hold]

Im giving the function of $x(t)=\sin(\omega_0t)\text{rect}\big(\tfrac tT\big)$. The sample rate is $f_\text{s} = \tfrac{1}{T_\text{s}}$. I need to make DFT to this. I said: $$x[n]=x(nT_\text{s})=\...
0
votes
1answer
46 views

Is there an example of an infinite signal? [on hold]

In the real world, Is there an example of an infinite signal?
0
votes
0answers
18 views

Butterworth filters and power spectral density

I am trying to get power spectral density estimates of an hour time series, sampled at 1Hz. The only frequencies that I am interested are between 1-20 mHz. I was wondering which is the more accurate ...
0
votes
0answers
21 views

what is the best interpolation algorithm to use in Digital Up Converter (Interpolator)

As a part of my work on SDR, I want to implement a DUC in an SDR transceiver. I was looking for the DUC structure and I saw that one of most important parts is an interpolation filter used to ...
0
votes
0answers
8 views

How to compute modulus and phase angle of images using complex morlet wavelet with fft function? [on hold]

I have a datacube of 250 thermal images. I am trying to compute the modulus and phase angle information of each images using complex morlet wavelet with fft function. Could somebody help me for this?
0
votes
0answers
26 views

How to interpret the energy value or a signal? [on hold]

I'd like to represent the frequency diagram or a sampled signal with a scale from -infinite to 0 db. Here is the way I'm processing : After applying a FFT to a finite temporal signal (= my sample) ...
17
votes
3answers
3k views

Show others how I hear myself

Sooo .. I've been thinking about this stuff. We all know that we sound different from what we hear of our own voice. It is easy to find out how others hear us by recording oneself and listen to it. ...
0
votes
0answers
23 views

PSD of a random field - mysterious power of 0.75?

I have a Gaussian covariance matrix $C$, with a known covariance kernel $k_C$. I would like to calculate the power spectral density of the Gaussian random field with covariance $C$. I would expect to ...
0
votes
1answer
11 views

What is the z-domain transfer function of variable delay?

Is it possible to obtain the transfer function of a signal that has a variable delay? For instance, I have a signal consisting of 10 samples: 0,1,1,1,1,0,0,0,0,1 If I would apply a unit delay to ...
1
vote
2answers
35 views

Random Process at a particular time instance

I was studying Random Process and I thought I understood what it was all about until I came across this example. Consider a random experiment of tossing a coin with sample space S = {H, T} The sample ...
0
votes
0answers
9 views

Blind source separation evaluation basics! [on hold]

I need a open view about blind source separation(BSS), like what actually happens when we apply BSS on a audio signal, where this signal has mainly male, female voices and background noise. Thanks in ...
0
votes
1answer
29 views

What is zero-phase filtering and forward-backward filtering?

I am pretty familiar with IIR and FIR filtering and I have implemented them in my several projects. However, recently i found something called zero phase filtering. I have tried to understand it but ...
-2
votes
0answers
31 views

multiplying cosine by cosine [on hold]

a cosine wave with amplitude 1 V and frequency 3 kHz multiplied by another cosine wave with amplitude 1 V and frequency 20 kHz can anyone help with how i would calculate this?
-2
votes
0answers
16 views

What are the best algorithms used for sound denoising in dsp

I thought of doing sound denoising depending on processing using wavelets, however my professor strongly stated that wavelets are not suitable for harmonics, and sounds as far as I know is mostly ...
0
votes
0answers
25 views

A time limited gaussian that has a bandlimit?

I am currently reading the paper Factored Axis-Aligned Filtering for Rendering Multiple Distribution Effects, which uses signal processing in its theory. There is one part that I do not understand. It ...
-1
votes
1answer
13 views

Applying window function to reduce out of band emission for a symbol in LTE simulation?

I have to apply a window to an IFFT'ed signal (based on LTE standards, simulated for 1 symbol - 100 resource blocks - 1200 subcarriers). I have a signal which I have simulated till the IFFT. Now I ...
0
votes
0answers
19 views

Software Recommendations to Remove MP3 50 HZ Hum? [on hold]

Have a MP3 voice recording(no musical instruments) made in UK that would like to remove all 50 Hz Hum. Am interested in all suggestions concerning Windows software that can do this because am totally ...
0
votes
2answers
60 views

z-Transform Methods: Definition vs. Integration Rule

The definition of the z-transform is defined as $z = e^{sT}$ where "s" is complex frequency for continuous-time systems and "T" is the sample period. Why are rules such as the forward rectangular ...
0
votes
0answers
20 views

Barker Codes: mission? [on hold]

I learn about Digital Communication. I see this example, but do not understand about Unipolar Barker Code block: what's their mission? Why do you need to use Repeat 2x block?
0
votes
0answers
20 views

bandwith for a preamble [on hold]

I have a signal $s (t)$ with bandwidth $B=50$ Hz for example. Does the preamble have to have a bandwidth $B_{pr}=50$ Hz too?
0
votes
0answers
23 views

How can I convert binary bits into index in MATLAB [migrated]

I have a question regarding how to use the binary bits as an index in MATLAB, For example, if I'm using 4 antennas to transmit data, in each instant, one antenna or two are active to transmit the data....
0
votes
0answers
22 views

Prediction Coefficients and Power of the Residual [duplicate]

A discrete signal x is generated by the recursive process- $x_n = x_{n-1} - 0.2 x_{n-2} + w_n$ where $w_n$ is white noise with zero mean and unit variance. What is the optimum order of a linear ...
2
votes
0answers
26 views

Frequency resolution - resolution BW relation for different window functions

I am working on FFT based spectrum analyser and I am not sure how to proceed calculating the RBW. According to the document (page 20) in the link, RBW described as $k \frac{f_s}N$ where $f_s$ ...
0
votes
0answers
12 views

Signal From Neurosky Headset [on hold]

What is the best method for pre-processing a signal extracted from brain using Neurosky headset?
0
votes
0answers
11 views

Frequency selectiv MIMO channel

Under which conditions is the open loop ergodic capacity of a frequency selective channel equal to an open loop ergodic capacity of a flat fading spatially white MIMO channel?
0
votes
0answers
21 views

How to find corresponding points between two photos when there's a repeated pattern?

Suppose that I have two photos, I1 and I2 and I want to find a set of corresponding points between the two photos to define a homography between them. There are many algorithms for this purpose, ...
2
votes
0answers
35 views

Noise cancellation using RLS Algorithm [on hold]

I am trying to do Noise cancellation using RLS algorithm at a software level, as part of my M.Tech Project work. Here, the error strength is continuously increasing, instead of decreasing as time ...

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