The phase tag has no wiki summary.
5
votes
1answer
82 views
Phase Correlation - Poor Performance on Noisy/Blurred Images?
I have successfully tested 1D phase correlation algorithm to determine vertical shift between two synthetic images.
When I moved to real images, however, it is not able to detect translation at all ...
2
votes
0answers
55 views
Phase Correlation and Negative Shifts
I am implementing phase correlation algorithm to determine shift between two images.
It generally works, but I am not sure how to interpret the resulting shift.
Pseudocode:
...
1
vote
1answer
62 views
retrieving original data from phase and magnitude of Fourier transform
I use this snippet of python code to transform data to Fourier phase and magnitude and then retrieving original data.
...
0
votes
3answers
124 views
Best method to extract phase shift between 2 sinosoids, from data provided
I have been asking around if the way I was extracting phase shift (lag) was correct, and I ran into some trouble... so in general, given 2 arrays of data of the same length, one represents the input ...
1
vote
3answers
182 views
Am I understanding the phase angle from FFT correctly?
Long story short, I have a sinusoidal wave with DC offset going in with a given frequency of say 100 Hz and $\phi = 0$ (which I'm guessing is really $\pi/2$ since it is a sine wave not cosine). I get ...
0
votes
0answers
33 views
In which bin would the phase angle be in FFT? [duplicate]
Say you have x = sin(2*pi*t*f + phi)
Given, f, t, fs and frequency vector to be f = linspace(-fs/2, fs/2, n);
where ...
3
votes
1answer
204 views
How to perform carrier phase recovery in software?
What are the options for recovering the phase of a BPSK signal in software? The only resources I can find online contain circuit diagrams – there seems to be no one willing to explain this to people ...
3
votes
1answer
107 views
Phase Locked Loop Basics
I am trying to better understand discrete-time PLLs. I drew a picture of a simple feedback system here:
I want to be able to describe and understand the system at v(t) and y(t). I found a fairly ...
0
votes
0answers
39 views
How to process/generate a phase shifted frequency varying sine wave?
I want to phase shift an incoming sine wave with varying frequency but I am unsure how to go about doing so in practical terms.
A little more info regarding the requirements:
I have an encoder ...
3
votes
1answer
230 views
How can a filter have zero group delay?
If you put a wave packet through the passband of a 1st-order low-pass filter, it will be delayed by the group delay of the filter, and remain the same amplitude, right?
If you put the same wave ...
0
votes
1answer
47 views
Using phase information to extract sample values
I have one cycle of the following signal stored in a memory:
x(n)=sin(2 * pi * n/N + theta)
where theta= 2*pi*q/N and q, N are integers.
How do I use ...
3
votes
1answer
110 views
Group Delay of a system
Say I have an LTI system whose impulse response h[n] is:
$$
h[n] = \delta[n] + \delta[n-4]
$$
I want to find the group delay of this system. I know the group delay ($grd$) is defined as:
$$
...
2
votes
0answers
97 views
How to find the phase lag between a sinusoidal input force and the response?
I have a system that is forced by a sinusoidal function with specific amplitude, phase and frequency. I get a deformation of sinusoidal form as well, and I would like to find the phase lag. I use FFT ...
1
vote
2answers
216 views
Why do you get instantaneous phase by calculating correlation with a carrier signal?
I am somewhat new to DSP. I'm trying to implement BPSK by following this Python QAM tutorial.
My code seems to work, but I really just ported the tutorial's Python code to C++, and do not understand ...
3
votes
1answer
141 views
What is a Phase Delay filter?
I'm looking at a job spec, detailed below. I'm perplexed as to what is being asked for.
Could someone offer a basic understanding of this material? I can imagine a solution may involve performing ...
0
votes
2answers
118 views
Discarding phase
What would happen if you took the STFT of a signal, discarded the phase information, and re-synthesized it? For example, just modulate oscillators tuned to each frequency bin by the amplitudes for ...
1
vote
0answers
141 views
Estimating The Time-delay using the Phase of the Cross- Correlation function
I am relatively new to time delay estimation. I am working on a project where I am estimating the time-delay from the phase of the cross-correlation function (CCF), since it is more reliable in ...
5
votes
1answer
128 views
Filter design with a phase delay specification?
Given a desired filter magnitude response, plus acceptable linear phase and minimum phase FIR filter approximations, how can one design a filter with the given response and a delay specification of ...
2
votes
1answer
141 views
plotting phase of a signal adding delay
I'm trying to plot the phase of this signal $s(f)=A^2T^2sinc^2(Tf)e^{-(j\pi Tf)}$
How can I plot manually this signal?I have to follow some particular rules?I have problems with the delay.
Edit
...
5
votes
2answers
1k views
Confirmation on how to calculate phase differences at every frequency point between two wideband signals?
I have a problem that I thought was going to be simple, but it has become surprisingly stubborn and I question my method...
I have used the method (described below), but I wanted to confirm that ...
