# Questions tagged [signal-analysis]

The processing of signals for the purpose of extracting a parameter or property embedded in a signal. Signal goes in and far fewer numbers come out.

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### How to utilize product graphs in graph signal processing?

I'm working with dynamic graph signal processing. How to plot time variation and spatial variation separately and take the cartesian product of those two graphs? Any relavant Matlab codes?
206 views

### Detect and Localize Abrupt Changes on a Noisy Non Periodic Signal

I have a set of some 5000 x,y datapoints. They plot a smooth curve with large gradient and curvature at the right. There is high-freq noise that varies in amplitude from dataset to dataset, but the ...
60 views

### Can Autocorrelation be used to Differentiate Signal Quality (High, Medium, Low, Very Low) for Periodic Signals?

I'm working on a project to classify the quality of periodic signals into four categories: high, medium, low, and very low (noisy). I was initially exploring autocorrelation as a potential feature for ...
69 views

### Simulation of Doppler shift in C/A code

I am trying to simulate C/A code under the effect of a doppler shift. Let's say the doppler shift is 5000Hz. I am assuming an ideal scenario where I can down convert the GPS to its baseband of 1....
24 views

### Power spectrum: $uV^2$ scale

I was reading a paper and found this figure: The paper defines slow wave activity as the mean power in the slow wave frequency band (0.4 to 5 Hz). I'm used to seeing power measured in "raw power&...
54 views

### why are the coefficients different when I design an IIR bandpass filter using butter compared to using the Filter Design Toolbox?

In matlab, for the same parameters, why are the coefficients different when I design an IIR bandpass filter using butter compared to using the Filter Design Toolbox? When I run a command in matlab <...
246 views

### Can someone explain me how the phase spectrum of trigonometric fourier series is related to phase spectrum of exponential fourier series of a signal?

Suppose we take a periodic signal and perform fourier analysis over it . Now we have two ways of representing the fourier series of this particular signal , one is trigonometric fourier series and ...
4k views

### How to measure the smoothness of a signal

so how can i determine if a signal is smooth or not ? And if its possible to get something indicating the level of the smoothness of my signal. I looked at the r-squared and hurst exponent but i ...
1 vote
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### Will open, edit, store from/to lossy audio format significantly degrade quality?

Say I have files only available as "ogg vorbis", 44.1kHz at 128 kbps vbr - which are meant for archival, but not much storage for lossless was available at the time. These are to be kept for ...
1 vote