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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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Fourier Transform shift property implementation in pytorch

I'm trying to implement the phase shift property of Fourier Transform with pytorch. What I mean by the shift property is this: I think that I've got most of the things correctly but somehow get a noisy image. I'm having a hard time solving this…
이민규
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Is there a tool or script to split a phased VCF into two separate haploid VCFs, one for each haplotype? (linux)

I have a phased .vcf file generated by longshot from a MinION sequencing run of diploid, human DNA. I would like to be able to split the file into two haploid files, one for haplotype 1, one for haplotype 2. Do any of the VCF toolkits provide this…
rusalkaguy
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Phase angle from FFT using atan2 - weird behaviour. Phase shift offset? Unwrapping?

I'm testing and performing simple FFT's and I'm interested in phase shift. I geneate simple array of 256 samples with sinusoid with 10 cycles. I perform an FFT of those samples and receiving complex data (2x128). Than I calculate magnitude of those…
Mateusz Kusmierz
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How to re-wrap phase image

I got several phase images ([-pi,pi]),and these images are interfeogram. I succeed in wrapping unwrapping velocity image by following code from skimage import exposure image= exposure.rescale_intensity(image, out_range=(0,4*np.pi)) image_wrapped =…
SHIHTENG CHANG
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Calculate relative phase between two angles - python

I'm trying to calculate the relative phase between a time series of two angles. Using below, the angles are measured by the rotation derived from the xy points associated to Label A and Label B. The angles are moving in a similar direction for the…
Chopin
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Inaccurate phase returned by np.angle

I am generating 2 sine waves, first one has fundamental frequency = 50 Hz, amplitude=10, phase=0, the second one has fundamental frequency = 100 Hz, amplitude = 5 and phase = np.pi/6 (which is 30degrees). Then I add them up, and perform FFT on the…
thileepan
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Plot phase graph from impulse response with delay adjustment

I'm trying to plot the phase graph of an impulse response with python, but the phase looks rather distorted. How can I add a delay to my code, so that the phase graph looks better, like in this example? I know that a have to add a delay of 1024…
joa77
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Find amplitude from a sinusoid equation

I want to find the Amplitude, frequency, time period and phase from this equation. I know how to find the frequency, time period or phase shift but I'm confused if there's any way to find the amplitude from the given information. A/5 *in (1000 +…
Afifa
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Calculate time lags from phase angle differences/phase arrows from waveletComp in r

I am looking at associations between biological and physical variables in time-frequency domain using wavelets and would like to look at the lags between two variables for specific time scales/periods. To do that I calculated and plotted wavelet…
Sil
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How to execute a task that is created in execution phase?

I am migration from Gradle 4.x to 6.x. Currently I create in the execution phase many dynamic tasks with data from previous steps of the build. The tasks can't be define in the definition phase. If I would create all possible task in the definition…
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Artificially generated EEG signal

I want to generate EEG data via R and test my phase prediction methods on it and how stable they are aggainst different levels of noise. But my generated "EEG" data seems to be off, I think I need to change the time or so. I really cannot figure it…
Pauwsmaul
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How to make a phase shift in a Sine wave?

I have a two problems: 1- estimate the phase of an unknown wave, after that 2- correct/change the phase of the investigated signal by adding or subtract to be in the phase of another wave. I used the following code to create a sine wave and tried…
H. H
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How to get phase and frequency of complex CSI for channel impulse responses?

I have measurements of channel impulse responses as complex CSI's. There are two transmitters Alice and Bob and the measurements look like [real0], [img0], [real1], [img1], ..., [real99], [img99] (100 complex values). Amplitude for the Nth value is…
MLDP
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Why is the initial marking phase in CMS serial

at the moment I'm trying to extend my knowledge about GC algorithms. What I can't comprehend right now is why the first phase of the CMS GC - the initial mark - is displayed everywhere as serial thread. Why isn't it done in parallel like the…
Stephan_Berlin
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Magnitude only reconstruction doesn't look correct, am I interpreting this correctly?

I have implemented a method from "Phase retrieval from the magnitude of the Fourier transforms of nonperiodic objects" paper available at: https://pdfs.semanticscholar.org/4796/592751aaa5b316aaefbd5eab09ca51fad580.pdf in which the authors…
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