# Questions tagged [noise]

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

1,102 questions
Filter by
Sorted by
Tagged with
36 views

### Imitate noise audio file with math function

Is it possible to reverse engineer a short white noise audio file and imitate it with a function instead? The file doesn't contain pure white noise, there has been EQ applied to it, also some ...
19 views

### How to add quantization noise (SQNR) to thermal noise (SNR) in a total value?

How can I add the BAQ (Block Adaptive Quantizer) compression noise to the input SNR? In the end is a quantization noise to be added to a thermal noise. I got the following formulation, but I dont ...
• 11
1 vote
37 views

### Random gaussian noise estimation from a given trajectory

I wish to estimate the noise of given trajectory from a measurement (data which is provided). I consider that the noise is random gaussian noise. I add here examples of two trajectories, one of the ...
• 111
1 vote
20 views

### Stationarity Test on Dataset

I have a nice and clean noise signal sampled at a fixed rate for several hours. When I calculate the PSD I see it's pure flicker noise. But I don't know much about the process. I've seen some ...
• 61
1 vote
30 views

### Power of noise signal through a matched filter (Digital Receiver)

I am studying matched filters and the sense of signal to noise ratio. In a question I was given, stated that: Show that a matched filter of a signal $s(t)$ maximizes the SNR of the output on a ...
13 views

### Simplest explanation of the relationship between gyro bias <> angle random walk (ARW) and accel bias <> velocity random walk (VRW)

We are discussing the errors to consider when using IMUs for navigation. I seem to have a problem wrapping my head around the general concept of the topic and need some help. I understand that the ...
• 1
20 views

### Reference for Wiener-Kolmogorov whitening procedure

In an old paper, accessible only for a fee, I found: (where the LHS of Eq (5) lack the symbol of derivative). What is the Wiener-Kolmogorov whitening procedure? I would like to study this procedure, ...
• 295
37 views

### Noise Reduction - noisy lines

I'm trying to reduce the noise in this photo. What type of filters/techniques should I use to cancel out the noise? I've tried using box filter and Gaussian filter to blur out some of the noise, but i ...
• 41
1 vote
37 views

### Is there any data or theory about human visual system to identify details under noise?

For one clean image, one person can identify every details at first. Then white Gaussian noise is added to the image. With low noise level, one person can still identify every details even though ...
• 363
51 views

### Pop and buzz noises caused by the signal process

There is a measurement called waterfall effect in audio systems. When you apply a sweep signal starting from 50Hz to 20KHz, it shows how long the resonance of the speaker goes. For example in the ...
• 131
1 vote
30 views

### AWGN continous time channel + colored noise

I'm working on an exercise but I'm stuck at the question where the noise becomes colored, can someone help me ? Let $\{\psi_1(t) = \mathbf{1}\{t \in [0,1)], \psi_2 = \mathbf{1}\{t \in [1,2]\}\}$ be an ...
• 15
1 vote
27 views

### How to remove the unknown intervention from the signal (Octave)?

we have a signal recording and there are always interventions, I think it is not a noise, since it is not continuous but occurs in intervals, with 25 Hz (please see below). It is not affected by the ...
• 11
41 views

### Extract a signal from noise, so I can view noise spectrum only?

I have a perfect modulated signal. I have the same signal but with noise, this noise is from non linear amplification. Is it possible, to extract the clean signal so it's just leaving the noise? The ...
• 43
1 vote
72 views

### Simulating RF interference (noise) to captured RF signals

I have carried out an approach to clean my RF signal captured in order to perform classification on a set of devices. However, a further extension to this study I aim to achieve is to evaluate the ...
• 77
1 vote
111 views

### Is a white noise always zero mean and uncorrelated?

It seems to be silly, but is it possible to deduce mathematically that a white noise is necessarily zero mean and uncorrelated? I have seen some people defining a white process as a zero-mean and ...
1 vote
67 views

### How to optimize noise reduction to perform burst detection and detect oscillations?

Let be $\mu_k$ some univariate signals of time $t$. I am performing burst detection to detect oscillations in any signal $\mu_k$. I tested the following methods : Perform noise reduction on $\mu_k$ ...
• 125
26 views

### Convert filter coefficients at one sample rate to different sample rate

I was doing some research into dithering in audio, and I was always wondering what Audacity's "Shaped" dither was. Well, turns out it's noise shaping, with an FIR filter whose coefficients ...
• 111
35 views

### Which type of noise can we see from the given image signal and its abs of 2D FFT?

1. Background: I get an 128*128 2D one-channel noisy image as follows: I get the shifted absolute values of 2D FFT result by the following Python code: ...
• 101
1 vote
31 views

### Thermal noise from circuit transfer function

Is it possible to compute the thermal noise of an electronic system given only it's transfer function (phase + magnitude)? In my case I have a black box circuit of passive elements. I can't measure ...
• 113
19 views

• 171
64 views

### Are there Fourier methods for VERY low frequency repeating signals?

Suppose I have a very low frequency pattern of sound. For example a 10 second music file. Then 10 seconds of silence. Then the same 10 second music file repeated again. The whole sequence repeats ...
• 101
43 views

### How to interpret Allen Deviation with increasing negative slope

I was calculating the Allan deviation (utilizing the Python module allantools.adev, which relies on eq. (6) in https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=50505). The expected behavior is a ...
53 views

### Adding AWGN into a positive real signal

I am trying to add a Additive White Gaussian Noise (AWGN) to a signal whose mean is 0.5. I am working with OFDM for Li-Fi communications whose signal must be real and positive. Normally, The AWGN is ...
• 61