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In signal processing noise can be considered random unwanted data without meaning.

1 vote
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Why is Power spectral density of random walk noise defined despite it being non-stationary? [duplicate]

While reading up on oscillator stability, I noticed that authors characterize random walk noise (Brownian noise) as having a PSD of $S_y(f) = h_{-2} f^{-2} $ where $h_{-2}$ is some constant. … This is in line with what Wikipedia has to say on the power spectrum of Brownian noise . …
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3 votes
1 answer
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Allan Variance vs Autocorrelation - Advantages

I gather that it was developed as an alternative to the standard variance as it doesn't necessarily converge for power law noise. …
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