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# Questions tagged [noise]

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

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1 vote
49 views

### How to convert digital value from MEMS microphone to Pa

I am currently trying to create an Android noise measurement app. I have found that the microphone built into the phone is a digital MEMS microphone and I am having trouble converting the digital data ...
1 vote
57 views

I am simulating the communication system shown below. I want to analyse the Fractionally-spaced Equalizer performance through BER vs SNR simulations. To meet a target SNR, I scale the noise power ...
• 161
69 views

### Unable to remove audio noise using weak signal power calculated from FFT as threshold

Question Please help understand the cause and solution of the problem of unable to remove the audio noise by using the signal power as filter threshold. If the approach is not correct, please advise ...
• 161
409 views

### How does a quantized signal represent all magnitudes?

I am having trouble with some intuition with quantization, bit-depth, noise floor, dynamic range and signal/noise ratio. Let's say I have two signals, $s_1$ and $s_2$ that are 1hz sine waves, with ...
30 views

### Fixing distorted part of the signal for signal preprocessing?

i'm trying to replace the distorted part of my signal wich is a multiplicative season + linear trend kind of signal , i tryed replacing it with the mean or median value but it's not what i want really ...
1 vote
78 views

### Phase Slope Distance Calcuation

After trying to implement IFFT algorithms for phase-based ranging, as outlined in this very interesting and descriptive blog post; I've been getting horrendous results (orders of magnitude inaccurate),...
35 views

### 1/ f noise of PSD behavior in Amplitude Spectrum Density

I‘m a bit confused: Assume that I have sampled a voltage signal and take the PSD of it, the units are in V^2/Hz. If it has flicker noise or 1/f noise in its spectrum I would see it as a function ...
16 views

### Track data using a digital elevation model (DEM) shows bridges and tunnels as "outliers"

(cross post from Stackoverflow) I've recorded bike tracks with very noisy results for altitude (barometric sensor). I enhanced the altitude data using a digital elevation model. See example here: ...
47 views

### how to identify flicker and RTN noise in a frquency spectrum

how to develop a signal processing algorithm to identify flicker noise and RTN noise in a frequency spectrum. Please help me.
1 vote
27 views

### Parameter value in bias instability modeling

In IMU error modeling, bias instability/flicker noise is often modeled by a first order Gauss-Markov process whose standard deviation is equal to the given BI coefficient [1, p.185][2, p.31]. Because ...
• 11
92 views

### creating range map doppler

I'm trying to create a range doppler map for a chirp signal which has the following parameters: pri = 5e-6; pw = 2e-6; CPI = 0.5e-3; B = 100e6; f_c = 40e9; for one ...
1 vote
38 views

### Intensity uncertainties in 2D image

I am trying to detect patterns in a raw image file where each pixel has an intensity. I can imagine fitting a 2D surface to the image (or to a portion of it) using a chi2, but for that, I need the ...
• 111
1 vote
72 views

### Minimum Number of Base Accelerations Needed to Simulate Gaussian White Noise in Structural Dynamics?

I am currently working on a scientific paper where I subject a structure to base accelerations modeled as Gaussian white noise. I am relatively new to signal processing and would appreciate some ...
62 views

### Signal Detection in Noise

I have known pulses, e.g. $A\exp(-\frac{t}{\tau})\cos(\omega t)$, but they are "hidden" in additive (let's say Gaussian) noise and it is not possible to predict when such events will occur. ...
• 103
95 views

I am currently studying the topic of oscillator phase noise in frequency modulated continuous wave (FMCW) radar. In my specific case, the radar is implemented on an FPGA (AMD RFSoC). Thus, the echo is ...
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1 vote
120 views

### Why is white noise uncorrelated for any two different samples?

Consider white noise with spectrum density $N_0/2$, it is known that the autocorrelation is given by: $$R(\tau) = \frac{N_0}{2}\delta(\tau)$$ Meanwhile the definition of delta function in the ...
• 123
1 vote
13 views

### Simultaneous removal of all noises in all channels?

Can MATLAB be able to look at all 16 channels of a bio-amplifier simultaneously and look for the common factor which is the noise which affects all channels simultaneously, and the noises removed from ...
• 115
49 views

### Understanding the additive white Gaussian noise (AWGN) representation

In my research work in wireless communication, I came across an equation of received signal wherein the AWGN is denoted by $n\sim\mathcal{C}\mathcal{N}(\textbf{0},\textbf{I}_L)$. Note that dimension ...
119 views

### Jitter model does not behave as expected after FFT

So I'm currently trying to understand the relationship between jitter and phase noise. To help my understanding I did write a little simulation in matlab. I used this model in the time domain, relying ...
• 1
45 views

### Equalizing Standard Deviations of Sequences through Smoothing

I have several sequences with varying standard deviations, and I want to smooth them so that each sequence has approximately the same standard deviation, which I've predetermined. I'm open to any ...
• 225
1 vote
175 views

### How does background noise affect the fft results for a pure tone

When I am recording a pure tone and conduct a fft, I receive a peak in the spectrum for this certain tone. Let's say the peak is 5 Now I am recording a pure tone with additional white noise. Does this ...
• 21
11 views

### Difference transformation and Stationarization of Moving Average

I have a temperature sensor data, I want to denoise it. The first thing that came to my mind was to take the moving average, it was very smooth but it is still not stationary. If I take the log ...
160 views

### 5G BER vs SNR for QPSK, 16QAM, 64QAM

Recently been running simulations where I run through simulating passing random data bits through LDPC Encoding, Modulation (4, 16 or 64) and then AWGN. The code itself is 90% developed by myself with ...
103 views

### Does oversampling lead to colored noise?

Suppose we receive $R(t)=X(t)+W(t)$, where $X(t)$ is band-limited to $[-B/2, B/2]$ and $W(t)$ is white Gaussian noise with autocorrelation $R_W(\tau)=\frac{N_0}2\delta(\tau)$. If we filter $R(t)$ ...
• 223
49 views

### Calculating variance of sensor readings from noise density

I do not know much about signal processing and would appreciate if someone could confirm if my calculations are correct. Here I have the Noise density of an accelerometer that has frequency 6400hz ...
1 vote
58 views

### How can it be possible that I hear people voice from my computer speaker?

I searched on web and apparently can be due to truck drivers communicating at CB band which is around 20MHz. And apparently this communication may interference with the frequencies used by computer's ...
• 15
44 views

### Is the noise at different sampling points related? [closed]

Given the power spectral density of noise, if the values at different sampling points of the same noise are added, what is the power spectral density at this time? Is there any correlation between the ...
• 1
18 views

### How to produce a noise spectrum from an rms velocity specification?

For a dynamic model I am looking at the appropriate input to analyse the performance under the influence of floor vibrations. The norm is an ISO VC-C floor spectrum as displayed in the image. However, ...
• 1