0
votes
0answers
4 views

How to set sampling frequency of an acceleration data set

I have a set of accelerometer readings in X, Y, Z axes obtained from an android based smart-phone. The data (in X, Y, Z) was recorded at different time stamps and there is no uniform time period for ...
0
votes
0answers
7 views

Getting the frequency of a 0.33Hz to 3Hz signal

I read a noisy signal from an accelerometer which is attached to the pedal of a stationary bike and need to find the frequency of the signal/ speed of the person cycling. I taught of the following ...
0
votes
0answers
7 views

How to calculate Coherent Change Detection?

I have two images which I wish to compare the difference between using coherent change detection and I'm having some trouble figuring out how to apply these signal processing equations to my data in a ...
0
votes
0answers
24 views

MATLAB, recover a signal that has a cosinusoidal interference and that has been AM modulated

I have a signal which has been AM modulated but the channel also added a cosinusoidal interference A cos(2 * Pi * f0 * n * Tc + Phase), at the same ...
1
vote
1answer
119 views

Applying a high-pass filter on constant signal

I recently implemented a Butterworth high-pass filter (2nd order). Everything seems to work fine, except that I have a question when applying such a filter to a constant signal. As there are no ...
-2
votes
0answers
14 views

Problem in reading speech waveforms

I have two waveforms, and I'm not sure which of them is for the word "cease" and which one for "shoot". Now I guess based on voiced and unvoiced waveforms(voiced should be periodic), the first one is ...
0
votes
0answers
8 views

Eliminate frames with high reflection

I have online camera stream and want to eliminate frames with high reflection like this for example: The constraints are : Real-time no more than 2-3 mSec on Mobile Non-reference : the process ...
0
votes
0answers
30 views

Perfect system identification or am i doing something wrong?

I am using MATLAB to identify a system. The problem with my method is that my result is perfect. I get a nearly 100% fit, which make me wonder if what I am doing is correct. I feed a sine sweep with ...
1
vote
2answers
31 views

Is this code for doing a moving average correct?

Is this code for doing a moving average correct? y=conv(x, ones(1,100)/100); I want to filter my speech signal with moving average filter in code. I think that ...
0
votes
0answers
23 views

Chebyshev waveshaping

I am trying to implement a Chebyshev waveshaper according to the description on the bottom post here: Add odd/even harmonics to signal? It looks similar to the algorithm here: ...
0
votes
0answers
33 views

Can we eliminate transient response by pre-calculating predicted transient response for some IIR digital filters?

So for IIR digital filters that have rational transfer function (assume bilinear transformation and low-pass filter), transient response can be calculated easily for inputs, because each input is ...
0
votes
0answers
7 views

How to offline classify EOG signal generated from eye movement?

I have the sample of EOG sample data in Matlab format in three column matrix (time,horizontal channel, vertical channel) and I want to extract the pattern of the eye movement from that sample which ...
0
votes
2answers
35 views

Am i performing Sinesweep correctly?

I am bit unsure whether i am doing i sine sweep correctly. I am feeding my system a sine wave with f hertz within a given time interval and log its output. And then i do the same for another ...
1
vote
2answers
32 views

How does multi-rate processing work?

In the case with a 1-D input like audio, how can a system with one input do many different kinds of processing at different sampling rates and still, at the end of the processing, produce one ...
1
vote
1answer
39 views

How does sampling rate affect discrete filters?

I am just starting to learn discrete filters and I could use some help. I understand continuous signals and filters. I am trying to understand the math behind discrete filtering. For example in the ...
0
votes
1answer
40 views

Minimum Energy Delay Property

I have 4 systems which are represented in z domain like this: Where I know the poles and zeros. Then I compute Partial Energy Sequence of impulse response of all these system using this formula: ...
0
votes
1answer
21 views

Algorithm for color-balancing an image

I'm working on color-balancing images with as little input from the user of my app as possible, specifically to remove color casts caused by scanning aged paper. Photoshop's Auto Color action works ...
0
votes
0answers
9 views

spectral mask and power spectral density

I have been reading a paper that specifies the spectral mask for certain communication devices attempting to send something over channel Can someone explain 1) importance if this spectral mask ...
0
votes
0answers
9 views

Energy-based speech recognition [duplicate]

I have a noisy recording with individual letters spoken. In a spectrogram view of the audio, the letters have higher energy. What can I use to isolate them? I'm fine with any tool.
0
votes
1answer
41 views

Slight crackle with overlap-add frequency-domain convolution

I'm trying to make an FFT audio filter using overlap-add but there's some slight rhythmic distortion/crackle in the output. I have an irSize (impulse response size) of 512 samples and a blockSize of ...
0
votes
0answers
17 views

Half Sine Pulse Shaping design

The standard of 802.15.4 specfies the following 'The chip sequences representing each data symbol are modulated onto the carrier using O-QPSK with halfsine pulse shaping.' For pulse shaping the ...
0
votes
1answer
27 views

Parallel Goertzel filters in C# [on hold]

I have 2 frequencies in my application: $12000\mathrm{Hz}$, $13000\mathrm{Hz}$. I want to set a parallel Goertzel filters and every 100ms I want to take the bigger magnitude for detecting the tone ...
0
votes
0answers
24 views

Controlling one signal with another one (Rocket engine effect - Subtractive synthesis of sound)

I programming some sound effects in Java and exporting them into .wav files. Currently, I am trying to program a rocket engine sound effect. I want to do it in the following way: The sound of a ...
0
votes
0answers
8 views

Why can CPRI links not be wireless?

I have been studying about CRAN and the CPRI links (fronhaul links) and have observed that CPRI links are always either fiber cable or some electrical interface. Why is this needed? Is it related to ...
0
votes
0answers
18 views

Which algorithms one can use for matrix inversion (for beamforming application MVDR/LCMV) in Fixed Point? [on hold]

I have implemented beamformer(MVDR/LCMV) for speech enhancement in matlab, now I am trying to convert it to fixed point implementation. during the weight calculation step correlation matrix inversion ...
1
vote
1answer
54 views

What is the low-pass filter that gives minimal transient response?

As title says, what is the low-pass filter that gives minimal transient response? By minimal transient response, I mean minimal settling time with reference to very tiny amount of divergence of ...
0
votes
1answer
23 views

Inputs for system identification

What effects does have a different input such as impulse, step, sine sweep etc. on performing a system identification? I mean what is up/down side, and which one is best, and why chose one rather ...
0
votes
0answers
5 views

Discrete dataset into to continous dataset?

I am trying to perform system identification on a system.The input i am going to provide is sinewaves with different frequencies. I sampled a sine wave with 100 Hz which is used a input for the ...
1
vote
0answers
32 views
+50

Matlab : Proper estimation of weights and How to calculate MSE for QPSK signal for Constant Modulus Algorithm

I had asked conceptual Question about Constant Modulus Algorithm. I am implementing the simple steps of the algorithm, as I do not have the cma() built in ...
1
vote
1answer
21 views

FFT peak estimation: Zero-padding vs signal repetitioon

I am working on obtaining the vortex shedding frequencies behind a 2D square using CFD. Time-varying data is being extracted from a specific cell behind the square. I've written a little python script ...
0
votes
0answers
22 views

Spectral density of signal written as quadratures

Suppose I have a real signal $f(t)$ written as $$f(t) = I(t)\cos(\Omega t) - Q(t)\sin(\Omega t)\, .$$ What is the relationship between the spectral densities of $I$ and $Q$ and the spectral density of ...
0
votes
1answer
24 views

Beginner level : Help with terminologies : smooting length, length of channel, channel equalization delay, blind system identification, equalization

Say the channel model is an univariate FIR filter with true coefficients $h=[1,a_1, a_2 ]$. I am learning algorithms for system identification and channel equalization. For this, I am implementing ...
-1
votes
0answers
30 views

Implementing xcorr() in the time-domain

This should be straight-forward. It is proving not to be. I want to implement xcorr in the time-domain (as it is usually defined). Why does the following MATLAB not producing the same plot as when the ...
0
votes
0answers
14 views

Simulate noise on the x axis for raw time-of-flight mass spectrometry signals

I am analyzing raw mass spectra produced by a time-of-flight mass spectrometer. These spectra are 2 dimensional signals that consist in intensity values with respect to mass/charge values. Here is an ...
0
votes
2answers
42 views

Noise removal from audio using FFT/Spectral editing

I have a noisy recording with some letters spoken out loud. I've noticed that the noise is easily recognizable when looking at a spectrogram of the audio. Is there anyway to set a power/frequency ...
0
votes
2answers
31 views

Upsampling by zero padding or duplicating sequence

I need to upsample a 2 MHz signal by a factor of 3000 to convert the OQPSK modulated baseband signal to passband. When I upsample by duplicating the elements in the sequence, I seem to get less error ...
0
votes
0answers
24 views

I am trying to transform a signal into multiple images but the images are not clear

I have a signal that contains three distinct images, this means that I have three frequencies or peaks, and each one corresponds to a picture. I have a function that converts a signal into an image. ...
0
votes
0answers
4 views

what is in intuitive explanation of local derivative pattern (LDP)?

Zhang et al. proposed the LDPs for face recognition . They considered the LBP as the nondirectional first-order local pattern operator and extended it to higher orders ( th-order) called the LDP. is ...
0
votes
1answer
30 views

Frequency Spectrum of a sequence

The OQPSK modulator in Matlab produces an output sequence as follows: [0.707 0.707+0.707i -0.707-0.707i ...and so on ] This is the sequence and I am trying to view the frequency spectrum of this ...
0
votes
1answer
24 views

What does it mean when one model fit the data better than does a comptitor model?

I'm trying to review MLE (maximum likelihood estimation). What does it mean when one model fit the data better than does a comptitor model?
1
vote
1answer
14 views

MIDI out from freeware sequencer to PD or Max/MSP

I'm looking for a way to send MIDI from a cheap or free MIDI sequencer to Pure Data or Max MSP so I can do realtime MIDI processing in PD/MAX. So I guess I have a couple questions: What is a good ...
0
votes
0answers
2 views

Can we use Data Fitting for Optical Chromatic dispersion compensation

Can we use Data Fitting for Optical Chromatic dispersion compensation any matlab example from where I can learn how to do it .
2
votes
1answer
41 views

Constant Modulus Algorithm and the gradient operation

CMA is a blind channel equalization algorithm with the details presented above. I am facing 3 difficulties and shall appreciate help Q1: Does $H$ and the bar over $\bar{y_k}$ represent the ...
0
votes
0answers
8 views

Wireless channel bandwidth used by device with smaller bandwidth

Recently I have been investigating wireless local area network. I copied a sentence which I dont understand A 80 MHz device associates with an 160 MHz Basic service set. What does this mean, ...
0
votes
1answer
16 views

Result of a specfic plot

If we plot for example the relation between the probability of False Alarm (pfa) and the threshold. The threshold is in x-axix, while the $log _{10}(pfa)$ in y-axis. If I get for example the ...
2
votes
1answer
28 views

KLT tracker implementation

I'm working on a object tracker based on KLT algorithm using matlab. Can anybody guide me how I can find the features and calculate the distance in the sequence of the frames? Thanks.
1
vote
1answer
105 views

What do we espect Likelihood function used for?

In my understanding, I let make a example. For example, you can see in the following picture. Consequently, We want to find ^sigma. and We have already known the observation data(which is random ...
0
votes
3answers
30 views

Modulation GMSK with I/Q

I have a doubt about something. GMSK Modulated signal is equal to I+Q (with I = cos and Q = sin) or I+i.*Q ? Thank you. Best regards.
0
votes
0answers
15 views

Theoretical BER - 802.15.4

The 802.15.4 standard gives a formula for the BER calculation but they have considered interference while computing this formula according to what I understood. I am trying to find out what the ...
-2
votes
0answers
11 views

classification objects in an static image using zeneric moments [on hold]

I want the details for programming Zeneric moments for classification of objects in an image. So can any one help to start up programing

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