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1answer
17 views

Relating phase shift to the ROL/ROR operations

Is phase-shifting in continuous-time analogous to the rotate-left (ROL) and rotate-right (ROR) operations in discrete-time?
1
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1answer
27 views

How would Fourier and Cosine Transforms responds to summation of cosines with same frequency but different phases?

For example, if I have two signals, $\cos(2\pi ft+\frac\pi4)+\cos(2\pi ft+\frac\pi3)$, what would be different in both transforms (Fourier and cosine) how would the spectrum changes? And What would ...
0
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0answers
28 views

Finding phase of fundamental from autocorrelation

I have some code, shown below that I have been using to find the fundamental of a guitar string. After this function is called, I go thru the real buffer and find the peak, whose location gives me ...
0
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2answers
64 views

How to plot magnitude and phase response by hand if I have the Transfer Function?

I have the transfer function of the system, which is: $$H(z) = \frac{1-z^{-1}}{5(1+2z^{-1})}$$ How do I sketch the magnitude and phase response? I'm sorry for the bad formatting, it's my first time ...
-1
votes
1answer
30 views

Code for a wavelet based hilbert transform? [closed]

I normally implement the Hilbert transform using the Fourier transform. I have noise related issues I want to solve. Does anybody have an (apodized) implementation of the Hilbert transform handy, ...
1
vote
1answer
55 views

How to shift a signal to the center of the frequency domain?

Let's assume I have a 1024 x 1024 matrix that represents the spatial domain. After I perform a FFT and center the frequencies, I get the a signal that looks like the following in the frequency ...
1
vote
1answer
25 views

Reasoning Behind Additional Phase Shift in DPSK

In MATLAB's Comm System Toolbox there is an option for 'Phase Rotation', defined as the phase difference between previous and current modulated symbols when the input is zero. This is the first time ...
1
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1answer
34 views

Reducing standing waves with phase randomization

Will constantly randomizing the phase of an audio signal, say a speaker in the corner of a square room, reduce standing waves (i.e. room modes) in the room? For example if you wanted to create a ...
1
vote
1answer
82 views

How to remove 50 Hz frequency noise from a PCM file?

Are you kind to tell me the odds or the means by which should I grab a clean signal with the $~50 \mathrm{Hz}$ carrier removed using just programming? I managed to make a program in Visual-C that ...
1
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2answers
98 views

Strange step response

In the figure there is represented a step response of a mechanical system. I created a step variation in the excitation of a DC generator. This lead to a step variation in the torque developed by that ...
5
votes
3answers
76 views

Continuous phase for phase delay calculus in FIR filters

I would like to estimate the phase delay accurately for any random FIR filter. The definition of the phase delay is the continuous phase divided by the angular frequency (with a sign change). That ...
0
votes
1answer
48 views

What is the absolute phase and the relative phase, of a signal?

I need to know what is the absolute phase and the relative phase, of a signal? and why these phases are important in the signal processing?
3
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0answers
33 views

Amplitude/phase recovery on noisy signal

I have a noisy signal that has an ac component of fixed frequency but variable amplitude and phase. I'd like to recover the ac component. The signal (blue trace) is mostly smooth, but has a few ...
0
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3answers
39 views

Phase shifting a noisy signal

I have a signal of the form $s(t)=A(t) \sum \cos(\omega_i(t)t +\phi_0) + n(t)$, where $n$ is gaussian noise. I can only read the signal+noise and thus can not separate them. I want to phase shift ...
0
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0answers
28 views

Obtaining a frequency response from other frequency responses

I have loaded six impulses responses (1024 samples each in length) into Matlab, zero-padded the end of each with 1024 zeroes and taken 2048 point DFTs of each using Matlab’s built in ...
0
votes
1answer
89 views

Why does this reconstruction produce a phase shift from the original signal?

After an FFT of a signal is done, it is plotted as in the image below, with the original signal is on the first subplot. Using the magnitude and phase data of each frequency, it's reconstructed, ...
0
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0answers
20 views

Help Understanding Time of Flight Phase Sanitization Algorithm

I'm implementing the technique found in this paper: http://front.sjtu.edu.cn/~jinyh/gradCourse/Paper/Wireless/SpotFi%20Decimeter%20Level%20Localization%20Using%20WiFi.pdf to perform localization. ...
2
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2answers
122 views

Extracting accurate phase and amplitude information from FFT with an arbitrary number of samples

This is a followup question to one I asked earlier based on the chat after the answer given by @hotpaw2, and cross-posted from stackoverflow since it was suggested it is more relevant to DSP. I have a ...
0
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0answers
19 views

Ideas to implement phase shifter on 4DSP FPGA FC6301

I have an FPGA FC6301 and I need to implement a simple phase shifter using StellarIP. At the moment i'm using Fpga FC6301 with carrier FMC144 by 4DSP and I'm using the provided design named: ...
1
vote
1answer
38 views

Will decorrelating an audio signal help reduce interference patterns at low frequencies?

In live sound it is common to have a left/right sub-speaker configuration, which will produce an strong interference pattern in the audience area based on listener/sub-speaker locations. If the ...
0
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0answers
35 views

Average Asynchronous Resample Latency

Given a sample frequence of 1 Hz and periodic events. The latency of an event is the time difference to the next sampling point. What is the average latency over infinitely many events? Events are ...
0
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0answers
10 views

Estimate gain and phase from measured input and output

I have a measured output from a closed loop controlled complex system with a simple sinusoidal command input. How can I estimate the gain and phase between input and measured output?
0
votes
1answer
12 views

DAPSK bit assignment for the amplitude difference

I am studying DAPSK(Differential amplitude phase shift keying) at the moment. I have a 64-DAPSK. We are using 4 concentric rings and 6 bits per symbol. The first two bits contain the information of ...
0
votes
2answers
70 views

How do I find the phase response of a filter from the filter equation?

I am new to this forum. I have been teaching myself DSP for the last two years, so my experience and knowledge has a long way to go. I am trying to find the phase response of a specific filter that I ...
0
votes
1answer
56 views

Minimum Phase & maximum phase

i have 2 questions: 1-If zeros on the unite circle that will be min or max phase?and this system has low-pass frequency response or not ? 2-Is the min phase has the shortest impulse response?
2
votes
2answers
198 views

The need for phase wrapping?

I understand the need for phase unwrapping and the complexity behind it. But, I'm struggling to understand why the phase information gets wrapped between $-\pi$ to $\pi$ in the first place?
1
vote
2answers
122 views

How is the Leslie speaker simulated?

What are Leslie speaker / "rotary" style of digital audio processors doing? I think a simple one would model: Delay between speaker and a pair (stereo) of microphones. The tonal change when the ...
1
vote
1answer
65 views

Phasor notation of a complex number with apparently non-constant radius

I'm asked to find the phasor of this signal: $$ x_1[n] = 3\sin\left(\frac \pi7 n\right) + 4j\cos\left(\frac \pi7 n\right),\quad (0\le n \le 20) \,.$$ The phasor is defined as: $$ G z_{0}^{n}= ...
0
votes
1answer
36 views

Phase spectrum: $\mathrm{arg}\mathcal{F}(\omega)$ or $\mathrm{-arg}\mathcal{F}(\omega)$?

Do we need minus or not? I need to extract phase spectrum from that thing $$f(x) = \frac{1}{2\pi}\int_{-\infty}^{\infty} e^{i\omega x}d\omega\int_{-\infty}^{\infty}f(t)e^{-i\omega t}dt$$ I can do it ...
0
votes
2answers
80 views

Filter Design for Phase Response

How can I design an all pass filter to have a constant phase shift over a bandwidth centered around a carrier? I don't care about phase shift outside the band. I would like to have the filter in ...
0
votes
1answer
73 views

Get phase information from bursty time series with amplitude variability and sharp edges

I have time series like this one, and I am trying to get the phase information from it. If it matters why, because I need to compute the precision of the cycles and amplitude variability is ...
0
votes
1answer
43 views

Why is the name “Phase vocoder”?

I've read that phase vocoder is the STFT, but done in windows (i.e. using windowing). Why is it called "phase vocoder"?
1
vote
1answer
48 views

Overlap/Chunk processing possible with Zero-phase?

I'm relatively new to DSP and I'm currently investigating FIR filter and IIR filters. From what I've found FIR filters can be implemented efficiently using the overlap-save method, but I was wondering ...
0
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4answers
151 views

Design Hilbert filter at matlab (pure 90 phase and magnitude 0db)

I need to design a filter able to take a measurement of alternate current and shift the phase of the input by 90°. The filter should work between 40 and 60Hz and at this range should have unity ...
1
vote
1answer
47 views

Would subtracting the phases of two images be a superior difference metric than subtracting the images directly?

I'm hoping someone can sanity check this idea as I am admittedly a bit of a noob when it comes to working with FFT's. Say I have two (registered) images of two of the same object and want to use one ...
0
votes
2answers
181 views

Phase measurement

I have a problem with phase measuring. I'm acquiring two signal with a USRP (complex signals) with a coherent generator and I want to measure the phase different between them.. One is at 150Mhz and ...
1
vote
2answers
208 views

Phase spectrum of the DTFT of a rect pulse using FFT

I'm trying to use the FFT to plot the phase spectrum of the DTFT of a sampled rect impulse function. Here's the Matlab code I've written. ...
1
vote
2answers
95 views

At what amplitude does spectral leakage start to be noticeable in the phase spectrum?

I understand that discontinuities at the boundaries of a finite signal may introduce spectral leakage, that alter both the amplitude and phase spectra of the FFT, specially at low amplitudes. That is ...
0
votes
0answers
31 views

Amplitude, Phase via DHT

How can I find out Amplitude & Phase of an audio signal via Discrete Hartley Transform? Isn't it like finding via DFT, as I know DHT is similar to DFT except imaginary part?
1
vote
1answer
58 views

Is there any way of retrieving phase information with only access to real part of successive FFT frames?

Due to a limitation of the WebAudio specification the FFT available in JavaScript only makes available the real part (1st half) of the calculated frequency data. Is there any way of recreating the ...
4
votes
1answer
118 views

Minimum phase FIR method

I am trying to make a minimum phase filter (in wxMaxima) according to these steps: first create a "normal" FIR (a simple sinc, wc=0.4, random example, but in the pictures a remez with Octave) ...
0
votes
3answers
91 views

What is the minimum number of time points recommended for accurate instantaneous phase estimates using the Hilbert transform

I have two time series. The two series look like they follow the same function, but one appears to lag slightly behind the other. I would like to determine if there are phase differences between the ...
2
votes
1answer
39 views

How do DAWs align the phase when working with plugins?

I'm no signal processing guru, so I'm looking for a pretty basic explanation that I'll understand. I've seen this question about Phase Locked Loops, but I have a hard time understanding that, ...
0
votes
3answers
148 views

Find frequency/phase response of a microphone

I am trying to find the frequency/phase response of two cheap microphones bought off Ebay. Basically, I want to graph the frequency responses and phase responses of both microphones on the same axis ...
0
votes
1answer
287 views

Phase locking value / phase synchronization

I have pairs of EEG signals filtered to give me just alpha bands. For a machine learning problem I have found that calculating the phase locking value between the alpha signals of these 2 channels ...
0
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0answers
33 views

Time and phase estimation in OQPSK using ML criterion

Let me first make an introduction to the problem by stating some intermediate results: An OQPSK signal has the general form: $$\\\tilde{s}(t)=\sum\limits_{i}\tilde{a}_i ...
1
vote
3answers
208 views

How can I extract a sinusoid from a very noisy signal for computing the phase shift?

I have done some measurements and I got two very noisy signals. I want to extract a certain sinusoid from the signals and I want to compute the phase shift between them. I made some simulations and I ...
0
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1answer
51 views

Maximum Likelihood carrier phase estimation of $A\cos(2\pi f_ct)$

This question refers to the example 5.2-1 of the book "Digital Communications, 5th Edition by John Proakis, Masoud Salehi" (example 6.2-1 in the 4th edition of the book) which asks for the estimate ...
0
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0answers
60 views

Change phase of all pass filter in real time

I am using an all pass filter to change phase of incoming audio in frequency domain. The all pass is designed in such a way that it applies linearly increasing phase shift (say from 0 to pi/6) to ...
0
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0answers
37 views

noise in signal

I am trying to add phase noise in signal. However, when i see the graph in frequency domain the spectrum is not broading. Can anyone tell me what mistake i am making? ...