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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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Why numpy fft return incorrect phase information?

I compare phase and amplitude spectrum in Matlab and numpy. I think Matlab work correct, but numpy compute correct amplitude spectrum, but phase spectrum is strange. How i must change python code for correct computing fft by numpy? Matlab: fs =…
Антон Пименов
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How to perform ordered tasks in Maven2 build

I am trying to migrate a Java application built by Ant to Maven2. Among other the build perform the following operations: Running a javadoc doclet to find annotated Java files to be externalize later as Web services compile a small part of the…
rperez
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elasticsearch search phase execution

I'm having issues and I don't know where to turn. Long story short, my web designer left me high and dry and I have no idea what he did and he refuses to answer his phone. I have access to the main page but after that, I'm completely locked out and…
Brandon Vigil
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Maven - add custom phase to execute plugin with other configuration

I have two set of integration tests in one maven project - automatic and manual tests. The manual tests are few but tedious - they require pulling the plug of servers etc. I would like to create a separate goal for the manual tests, so i can run…
Alexander Torstling
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"Phased" execution of functions in javascript

This is my first post on stackoverflow, so please don't flame me too hard if I come across like a total nitwit or if I'm unable ot make myself perfectly clear. :-) Here's my problem: I'm trying to write a javascript function that "ties" two…
FK82
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Fixing phase unwrapping errors in Numpy

I have a series of unwrapped phases, with some unwrapping errors that consist of a jump of +/- a multiple of Pi: import numpy a = numpy.array([0.5, 1.3, 2.4, 10.3, 10.8, 10.2, 7.6, 3.2, 2.9]) In this example there is a first jump of 2 cycles…
Benjamin
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How to get Pi-Phase from sound to get a destructive interference in Python

first: I don't know where to put this topic because it's an programming and sound-question. Please comment if it's at the wrong place. But this is my question: How can I load a sound into Python and create the "reverse-sound" of it. So when I play…
Noah Krasser
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Finding the phase of each harmonics using fft

I use Matlab. I have a sinusoidal signal : X (amp:220/ Freq:50) to which I add 3 harmonics : x1 => (h2) amp:30 / Freq:100 / phase:30° x2 => (h4) amp:10 / Freq:200 / phase:50° x3 => (h6) amp:05 / Freq:300 / phase:90° I sum all the signals together…
KADEM Mohammed
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JSF skips phases - How to debug that?

I'm debugging a foreign JSF application. The problem is, that I submit a form, but the values aren't carried over. With a phase listener I can see, that the life cycle doesn't run completely through, so to say it skips phase 2 -5: After the restore…
Peter Wippermann
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Request-scoped beans and datamodel initialization?

UPDATE II: OK, I managed to narrow it down a little. I have a page with a datatable with sorting and filtering functionalities, both taking place in the DB. In other words, I do not use the embedded functionality of the rich:datatable I use, but…
Markos Fragkakis
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How to get phase angle from FFT for an amplitude modulated signal

I have the measurements of an amplitude modulated signal. I analysed with the fft() matlab function. After I calculate everything by "the book", I have only one problem. The phase of the modulated signal is not ok. Only if I subtract pi/2 form the…
Elod
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With the audio tool sox, how can I determine whether a stereo recording is in fact mono?

I have stereo files (2-channel-WAV) which sound totally like mono recordings. Is there a way to let sox run over the file and output whewther the 2 channels are the same or not? Or is there another command line tool doing this sort of wave…
halloleo
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How do I find secret mercurial revisions?

I work on a lot of projects and sometimes I'd prefer to just delete my local repositories. However, I am limited in this by my occasional use of the secret phase (as I need to check how my repository differs from the server). Is there a search I can…
Stephen
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phase correlation using FFTW

Now for phase correlation(two images) I use 1d transform. How to use 2d transform(it will be faster?), how to use wisdom and multythread support? if you give code example is will be better. void phase_correlation2D( IplImage* src, IplImage *tpl,…
mrgloom
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Plotting and extracting fft phase

Here is a code that compares fft phase plotting with 2 different methods : import numpy as np import matplotlib.pyplot as plt import scipy.fftpack phase = np.pi / 4 f = 1 fs = f*20 dur=10 t = np.linspace(0, dur, num=fs*dur, endpoint=False) y =…
rem
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