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16 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 produce it using kronecker product.Can we ...
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2answers
51 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. This results in vibration in the beam. The accelerometer is ...
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3answers
46 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 ...
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0answers
11 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 ...
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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 ...
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0answers
16 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 ...
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3answers
37 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 ...
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0answers
35 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 :- ...
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0answers
12 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 ...
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1answer
17 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 ...
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0answers
16 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: ...
0
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1answer
38 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 ...
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2answers
145 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
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1answer
63 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 ...
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0answers
19 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
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1answer
26 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 ...
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0answers
15 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 ...
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0answers
24 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 ...
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3answers
135 views

How condition for existence of Fourier transform is valid?

The condition for Discrete time Fourier transform to exist for function $f(n)$ is given as $$\sum_{-\infty}^\infty |f(n)| < \infty.$$ In case of continuous Fourier transform the difference is ...
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0answers
25 views

signal and system [duplicate]

ROC converges if pole and zero lies inside ............................. a) origin b) z=1 c) pole d) zero. 2)z transform is use when system is not ........................................ a) ...
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1answer
22 views

Improving velocity estimation

I have a sensor reduction model which gives me a velocity estimate of a suspension system(velocity 1) . This suspension system estimate velocity is used to calculate another velocity(velocity 2) via ...
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0answers
18 views

PID Control - process variable / setpoint

I'm trying to design a PID controller but I have a problem in the following case: The process variable can only be between 0 and 1. The setpoint can be close to one, for instance 0.97. Hence the ...
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0answers
21 views

Zero Crossing rate

I have a question. Is it possible to have negative zero crossing rate? (can rate be negative?!?) Because I saw a figure which the signal has been broken in frames each of 10msec, with the plot of ...
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1answer
40 views

Linear Prediction Coefficients

I want to learn how to compute linear coefficient, but to be honest - I can't. I know how to use them if i have it and why I want them. Suppose this toy example: A signal $x=[-1, -2, 0, 1]$ ...
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0answers
40 views
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0answers
24 views

Goertzel filter Poles on unity circle influence of a behavior of a signal at high frequency

I'm trying to apply a goertzel filter on my sound data of 20500 Hz with sampling rate of 44100[samples/sec]. My bit duration which is passed to the goertzel function is returning a very low magnitude ...
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0answers
22 views

Is negative frequency important in calculating Spectral Moments

A follow on question form this one (What is meant by "spectral moment"?) In answers to the above referenced question spectral moment is defined as: $$ m_k=\int_{-\infty}^{\infty} ...
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1answer
50 views

What is the reason for filtering out the negative frequencies of a signal?

I am reading this tutorial. Quoting the lines from the topic "Analytic signals and Hilbert transform filters": the corresponding analytic signal $ z(t)=x(t) + j {\cal H}_t\{x\}$ has the property ...
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1answer
20 views

Path loss effect on BER

Does including log distance path loss to a communication system cause a drastic difference to the BER of the system? In other words, if I have a simulation for a communication system without path ...
1
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1answer
38 views

Pixel time series trend: What are the causes?

I have taken an video of the following static scene for 10 mins (3 frames/Sec); totally 1800 frames for 10 mins. I also show here the pixel time series, that is, a set of values of a particular ...
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0answers
25 views

How are sounds turned into phonemes

In the field of speech recognition, part of the process is to take a voice signal and break it up into constituent phonemes. For example, the English word hear is ...
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2answers
31 views

Log Distance Path Loss Model

While simulating a MISO system, I am trying to consider the effect of varying the distance between the transmitter and receiver on the BER. My search for the effect of varying distance has pointed me ...
2
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2answers
37 views

Any basic paper on biomedical signal processing to practise with?

I am quite interested in biomedical signal processing and I am looking for some biomedical signal processing papers in order to reproduce the results that they obtained. The idea is to redo what they ...
0
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1answer
36 views

How do I perform Specral Analysis (FFT, Windowing, Detrending) on Sonic Anemometer Data?

I am having trouble with all of the forums that I have looked at thus far. I have one day's worth of Sonic Anemometer data. I want to see the specral analysis of this data. When the anemometer data ...
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2answers
54 views

How can one put information within a signal waveform and make it to traverse through different kind of medium? [closed]

This is a soft question. There are different types of signals like analog ,discrete or digital one. But my question is how can one put information within a signal waveform and make it to traverse ...
0
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1answer
32 views

Simulation at Baseband or Passband

A naive question I guess. Would it make a difference in the results when a system is simulated at Baseband or at Passband. If I have a plot of a BER vs SNR curve that has been plotted at Baseband, ...
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0answers
41 views

In-phase and Quadrature demodulation

I'm new with signal processing and have started to learn it for physics research I am involved in. I have a signal which I want to process to find the amplitude of one frequency of. To do this, I'm ...
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0answers
33 views

Changes of phase in high frequency makes the speaker “clicks”

I modulate some data over sound in a 17.7Khz and 17.8Khz. It works like an FSK with a pulse duration of 0.015sec. When playing a string the speaker gives a very strange noise that it seems to be the ...
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0answers
39 views

24GHz FMCW Radar Signal Processing Questions

I am using the RFE-3400 (from Innosent) 24Ghz Radar Transreceiver in FMCW mode. The output of the radar module has 2 channels of I/Q signals from 2 receiving antennas. My objective is to find the ...
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2answers
222 views

Shift a signal by fraction of a sample

I have a signal with a sample time of 0.5 micro seconds and I would like to shift this signal by a fraction of the sample time, say by 3 nano seconds. I have read a few online resources about ...
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0answers
37 views

What is spectral subtraction? [closed]

I have to write some simple examples in Matlab which use spectral subtraction. These examples will be included in a paper to help a friend understand spectral subtraction. But I don't know where to ...
0
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1answer
28 views

Applying a mathematical function to a 16-bit Python array

I am using scipy.io.wavfile to read a WAV file and playing it with pyaudio. Before the numpy array is written to a string and output through pyaudio, I would like to be able to apply some sort of ...
-3
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1answer
48 views

How Fourier decomposition is performed?

The Fourier decomposition explains a time series entirely as a weighted sum of sinusoidal functions and with the Fourier series,it is possible to do it. But I have some doubts Suppose ,for any ...
0
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0answers
53 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
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0answers
65 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 ...
0
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0answers
21 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
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1answer
52 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
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0answers
38 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
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2answers
65 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
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1answer
36 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 ...