# Questions tagged [power-spectral-density]

The Power Spectral Density (PSD) is the distribution of signal power over frequencies.

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### How to reprocess SDR data to be equal to that captured with a higher RBW

I have a data set that consists of max hold frequency vs intensity data from an SDR at a specific RBW. I want to reprocess the data as if I sampled it with the larger resolution bandwidth so I can ...
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### Moving from deterministic signals to stochastic signals in s-domain (Power Spectral Density)

Assume we have the following system (coming from control systems theory, hence in s-domain) $Y(s) = H_A (s) \cdot A(s) - H_B (s) \cdot B(s)$ I now wish to consider $a(t)$ and $b(t)$ as white noise ...
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### Power in a frequency band: Spectral estimation versus time domain

I wish to find total power in a given frequency band within different time windows of a signal. I see two methods of doing so, first in the frequency domain. One could estimate the power spectral ...
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### RMS of signal vs average amplitude

I am trying to estimate the average amplitude of some signal with frequency 6 Hz, sampled at ~300 Hz. See figures for a part of the signal and its dft calculated using matlab. I estimate the average ...
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### Definition of “Power” in “Power Spectrum” (for translator)

I'm a technical translator who recently undertook translation of documents related to signal processing. Being a novice in the field, I'm searching the web for terminology and concepts. It appears ...
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### Why use PSD to analyze a signal instead of its Fourier Transform?

Let's imagine I have a perfectly known signal $s(t)$ and I want to analyze its frequency components. I noticed that mostly everyone would use the PSD of $s(t)$ to do that, instead of simply use the ...
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### Normalised APSD

How you compute the Normalised APSD of a signal using python's scipy.signal libary. Do you compute only the APSD of the signal and divide it by (PSD * df) or there is something else?
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### Perceptual Based Adversarial Audio Attacks

I am reading this paper Perceptual Based Adversarial Audio Attacks I have a doubt what is meant by weighting in the frequency domain and what does Section 3.4-equation-4 wants to convey .Please refer ...
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### How to perform a permutation analysis of PSD?

I am new to Python & MNE Python. I want to perform a permutation analysis between the PSD of two conditions (1 & 2), across all subjects. I've written the following code for data that I have ...
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### Fourier Transform of a PSD and response of a PSD input

Does a Fourier Transform of a white noise exist? If so, what is its general form? It is possible to compute the fourier transform of a Power Spectral Density? My problem in detail. I have to compute ...
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### How to determine SNR required for adding AWGN noise to clean IQ samples?

I'm doing an experiment w.r.t PSD output. I have generated some 11a IQ samples and checking its PSD output in MATLAB using pwelch and comparing with the PSD output obtained using hardware. Here are ...
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### Oversample or undersample correlated noise?

I wish to measure nontrivial (non-Gaussian) broadband current noise for its distribution and power spectral density. The noise is amplified (with transimpedance amplifier) with some characteristic ...
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### PSD Accelerometer and Gyroscope

I used Xsens IMU and collected 1 Hour static data for accelerometer and gyroscope. I used the pwelch analysis in matlab to calculate the onsided PSD. The plots looks the following: How do I ...
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### How to extract the Freezing Index from Accelerometer data?

I'm working on a project to detect Freezing of Gait episodes for Parkinson's Disease patients, and according to this paper and other ones, extracting the freezing index which is "The power in the “...
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### Welch’s Algorithm of Averaging Modified Periodograms

I am second year Undergrad student in computer engineering . I have a homework problem where I needed to compute Power Spectral Density . I'm using MATLAB as I noticed that it has good documentation ...
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### Wiener Khinchin theorem : struggle in the derivation

I am reading Introduction to quantum noise, measurement and amplification, and I need to understand the Wiener Khinchin theorem: how to derive it. I also need to understand some context around this ...
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### Sinusoid amplitude loss in power spectrum estimation using Pwelch method

I am trying to estimate the amplitude or power spectrum of a sinusoidal signal using Pwelch method. The following is the matlab code I use. ...
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### Evaluating discrete spectral density at only a few frequencies

I'm trying to obtain the spectral density at three particular frequencies for a computational chemistry problem that I'm working on (if you are curious, it has to do with the estimation of Nuclear ...