# Questions tagged [noise]

This tag is for questions about noise. In signal processing, noise is a general term for unwanted (and, in general, unknown) modifications that a signal may suffer during capture, storage, transmission, processing, or conversion.

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### how to determine amplitude and frequency of Oscillator with random fluctuations?

I have the following system $$\ddot{x}+w^2 x=0,$$ with the following initial conditions: $\dot{x}(0)=0$ and $x(0)=x_o$, the solution reads: $$x(t)=x_o cos(t).$$ Now I want to include the fluctuations ...
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### Connection between continuous time and discrete white noise

I have a question about the connection between continuous time white noise and discrete white noise (i.e. i.i.d gaussians). If I understand correctly you cannot derive a discrete white noise process ...
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### Unitary matrix corruption

Suppose I have got a unitary matrix and I want to introduce random noise to simulate data corruption. How to introduce the noise in a proper way such that the corrupted matrix is also unitary?
1 vote
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### Can you simulate a continuous signal with gaussian noise using a noiseless discrete channel?

It is well known that you can communicate a discrete signal via a continuous but noisy one (see the noisy channel coding theorem). My question is, can you do the opposite in the case of gaussian noise?...
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### Fitting a noisy and incomplete arithmetic progression

I have a sequence of numbers that I know they belong to an arithmetic progression. I do not know the value of offset ($b$), the difference between consecutive numbers $\Delta$, nor the actual position ...
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1 vote
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