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Questions tagged [phase]

phase is angular shift between periodic signals.

phase is angular shift between periodic signals

  • for example signal x1(t)=cos(t) is the same as x2(t)=sin(t+PI/2)
  • angle PI/2 is the phase (angular shift) between sin(t) and cos(t)
  • phase is also used as angular coordinate for polar representations of phasor commonly used in electrical engineering
  • phase distortions of signals are called jitter
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Maven Config Plugins running twice

I have the following pom config. I added the cobertura plugin, and now pmd, cpd, findbugs, and test are running twice. I understand that is because of my "phases" config, but I don't understand how can I achieve the following: What I want is before…
Fernando Fradegrada
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How might I go about detecting phase changes in a sine wave of a certain frequency

I want to detect changes in the phase of a sine wave over time. I have a signal which is a sine wave in the KHz range and experiences random changes in it's phase. I want to detect these phase changes are count the occurrences. Ideally I would also…
SomeRandomPhysicist
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Phase Ambiguity of UHF RFID

I am working on a project that detect angle of arrival of RFID Tag by processing the received phases of multiple antennas and I am using the ThingMagic M6 RFID Reader. The phase of this Reader have an ambiguity of 180 degree, mean that when I read a…
Ben
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caffe forgets set variable during test phase

In caffe, if I make my own variable associated with a layer and I modify this variable during training iterations, the test phase does not know about the modifications to that variable, it seems to initialize it for itself. the training testing…
user2774587
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Preventing a node from running reduce task in hadoop

I have a master node and a slave node in hadoop cluster. Master is also configured to function as slave by starting nodemanager & datanode in it. Map phase is working in both master and slave node perfectly. I have only 1 reduce phase, but it runs…
Ram
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DDS frequency synthesizer digital phase lock loop

I am working on a project about a frequency-hopping tranceiver. I want to implement a phase lock loop on FPGA i.e. a digital PLL. I am multiplying the incoming signal with a certain frequency and passing it through a LPF. Now I give this low…
kamran zia
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How do you set the magnitude and the phase of the DFT of an image to a specific value?

I have the DFT of a picture and I need to set its magnitude and its phase to zero, separately. Also if the magnitude of an image is 0 it will appear entirely as black, right?
BourbonCreams
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how to distinguish a jsf action or direct url link invoked the page

I have a situation, I have a session bean with list, this list I show in html data table. When the user hits the url from browser or normal href, I have to show all records. There is provision to search for the data also, where I have to show the…
baba.kabira
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Python: Phase correction

I have two audio files and my task is to figure out a minimum phase transfer function that matches the files as closely as possible (there is lots of noise in the files so perfect match is not possible). I know the characteristics of the filters and…
Dole
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How to phase shift a sinusoidal wave- MATLAB?

I want to phase shift a sinusoidal wave as shown below. What is happening here is that a phase shift occurs at the point of the red line. So, instead of following its natural path(dotted lines), it begins to follow the shifted path(dashed line). I…
nashynash
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how to calculate gain of a controller for desired bandwidth?

I have been designing a controller for a motion system. The controller contains a gain, Proportional integrator(PI) and a lead filter in series. I have tuned the gain of the controller manually to obtain a desired bandwidth(cross over frequency).…
Somanna Thapanda
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Why does unwrap not give a monotonic phase?

I am playing with analytic signals, and the computation of the instantaneous frequency often yields negative results. It is troubling, for a frequency, to be negative. Although the concept of "instantaneous frequency" does not make rigorous sense…
Jonathan H
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How can I find phase angle for chosen frequency?

I am new in matlab so maybe my question is stupid. I have a two signals rec(t) and sent(t) for which I want to find time delay through phase vs. frequency realtionship obtained from cross spectrum. I obtained cross spectrum through the FFT of the…
Jakub Panuska
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Relationship between scale and frequency (Wavelet Coherence in Matlab)

I'm attempting to compute a phase-lag index for two signals. In order to do this I must first obtain a cross spectrum density in the time domain for the two signals. I've experimented somewhat with the wcoher function in matlab, but the input…
yatakaka
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What does phase spectrum means? Phase spectrum of sine and exp(x) in Matlab

I need some explanations, how to understand phase spectrum of different functions, and what does phase spectrum means I'm trying to plot phase spectrum of sine in Matlab. Here is a code: f(t)=sin(t); S(w) = fourier(f(t), t, w); w_values = 0:1:5; F =…
HelloWorld
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