Questions tagged [snr]

Signal-to-noise ratio (often abbreviated SNR or S/N) is a measure used in science and engineering that compares the level of a desired signal to the level of background noise.

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24 views

How to compute two Dimensional SNR

The signal is the white dot or it is a point target. and I have to find the SNR of this image/point target. As i increase noise in thie image, black back ground shows some disturbance. AnHow should i ...
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23 views

Communicate to user that SNR is too low - Speech procesing

I am working in a project to estimate the signal to noise ratio (SNR) for an automatic speech recognition system in order to generate an alert to the user if the noise is too high in the place where ...
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Why do I keep seeing this equation for $E_b/N_0$

I keep seeing $$\frac{E_b}{N_0} = \frac{E_\text{s}}{\rho N_0}; ~~ \rho=\log_2{M}$$ But my own calculation is: $$\frac{E_b}{N_0} = \frac{E_s}{N_0}\frac{1}{k}$$ Where $k = \frac{\rho n}{ms}$, where $\...
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19 views

Dimension error using findpeaks function in Matlab on Power Spectral Density to calculate SNR of audio data

I have a set of audio files for which I would like to determine a SNR metric. I tried to implement in Matlab as follows: ...
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230 views

Increasing SNR and Dynamic Range using Oversampling

How much gain in dynamic range and SNR can be expected if we are to oversample a signal with fixed analog input bandwidth. For Example if I have a analog filter at the input which limits the bandwidth ...
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1answer
83 views

How is signal to noise ratio actually measured by receiver equipment?

This sounds like quite a basic question but it surprised me, how is SNR actually measured? You have the incoming signal: It seems like the SNR is just the visual comparison of the peak signal '...
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1answer
54 views

SNR for the magnitude of a complex signal

The SNR for a complex valued signal is presented by Dilip Sarwate in: https://dsp.stackexchange.com/a/42359 Following the same steps I would like to estimate the SNR for the magnitude of a complex ...
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33 views

Sinusoidal tone in Signal-to-Noise measurements

Mengapa kita menggunakan nada uji sinusoidal saat mengukur signal-to-noise pada saluran bicara daripada hanya sinyal ucapan itu sendiri ? EDIT: Translation from Indonesian according to Google: Why do ...
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1answer
93 views

Finding Minimum SNR or Minimum Detectable Signal Based on Noise Spectral Density

Imagine I have an $n$-bit sensor, whose noise spectral density is $V/\sqrt{Hz}$. $V$ is an exemplary measurement unit. The desired measurement bandwidth is also known. Is there a mathematical way to ...
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1answer
57 views

How many bins to include when calculating SNR from FFT?

I'm a scientist conducting an experiment that requires some signal processing. My expertise is not in signal processing, thus here I am. We've basically re-created an experiment conducted by other ...
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Estimating Signal-To-Noise ratio from discrete time series

A hidden variable $x(t)$ (in my case, neuronal signal averaged over a brain area) exhibits dynamics on multiple timescales from milliseconds to seconds. An observable $y(t)$ is produced by convolving $...
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537 views

Quantization SNR of sine wave doesn't match 1.761 + 6.02 * Q

I am trying to show with numpy that the quantization noise of a sine wave matches the SNR formula of SNR = 1.761 + 6.02 * Q. The numpy code is simple: ...
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53 views

Isolation of a signal in a frequency band

I have a continuous signal. I digitize it at 40kHz. A useful signal for me is in the range of 500-1500Hz and takes ~ 50-100Hz. It can be located in any part of this strip at any time. If I apply a ...
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SNR calculation from signal samples

Is it possible to calculate the SNR from finite duration time-domain samples that contain the received signal, $y(t)$, where: $$ y(t) = x(t) + n(t) $$ and $x(t) =$ transmitted signal, and $n(t) =$ ...
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How to verify the obtained SNR of the noisy signal after adding noise?

I defined the SNR as follows: $$\rm SNR = \frac{\text{Signal power density}}{\text{Noise power density}}$$ Given noise-free signal, I added the noise to this signal by using the formula above. Now, I ...
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1answer
55 views

Es/N0 with roll-off

I was trying to figure out if the relationship between SNR and Es/N0 changes with roll-off factor. $W$: RF bandwidth. $B$: Base band bandwidth. $W = 2B$. $E_s$: Symbol energy. $P_s$: Symbol power. $...
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23 views

How to combine mutliple audio files with proper SNR

I have thousands speech records (just human voice 5sec shoots)) and another hundreds but longer environment sounds (street, restaurant etc) I would like to combine them in one track with natural SNR ...
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1answer
74 views

Differential Encoding for M-PSK

Confused about a few topics w.r.t. differential encoding/decoding. First, consider the below BER curve taken from wikipedia ( https://en.wikipedia.org/wiki/Phase-shift_keying ) comparing BPSK/QPSK and ...
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62 views

How to calculate time domain SNR using known sequence

I am using the following formula to calculate SNR of a real world complex baseband signal sampled at 1x Nyquist. ...
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1answer
75 views

How to calculate variance of noise on a noisy image (Noise+Signal)

I have a long exposure image captured at 70ms. (I1) (As attached) I also have another image captured at 0.7ms with Gain24. (I2) (As attached) This image has both noise and signal together. I would ...
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77 views

How to calculate sine wave SNR from oscilloscope

I'm trying to calculate the SNR of a sine wave produced with a 12 bit DAC. I'm new when it comes to calculating/measuring noise in signals. My idea was to capture the signal using an oscilloscope (...
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56 views

Filter a negative SNR signal whose frequency spectrum lies inside the noise frequency spectrum

I am a newbie in Signal Processing and need your suggestion in the following problem. My signal amplitude is 10 times weaker than the noise. Furthermore, the frequency spectrum of the noise and the ...
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Increase signal to noise ratio

I work with the K-LC6 microwave module. Previously, when the microwave module was assembled on discrete elements, the signal-to-noise ratio was 5. Now, with the transition to specialized microcircuits,...
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1answer
41 views

SINAD calculation in MATLAB

I want to understand how SINAD is calculated. In MATLAB there is a funciton called SINAD and I would like to see if I can obtain "the same" answer as the inbuilt function does. From the ...
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24 views

SNR in case of complex channel and fading

I am trying to estimate SNR mathematically given in a paper. $$ y = hx + n$$ $h$ is channel fading, that is Rayleigh in my case, while $n$. Both $h$ and $n$ are random variables. ...
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calculate decibel SNR in percent

i have the following metric for calculating the SNR for my predictions: i basically dont calculate signal to noise but signal to error. x is my prediction and y is the true signal. When i have an ...
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44 views

Instantaneous SNR

A relay system with 3 nodes: S (power node), R (relay node), and D (destination node). S transmit the signal x to R, received signal at R: $$y_R=\sqrt{P_sd_1^{-\beta}} h_{SR}\,x + n_r$$ with: $...
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33 views

What is the effect of sampling time, sampling frequency and SNR on latency? [closed]

I believe that if we have two or more external sound cards, hence clock would vary for each device. How will this affect the latency? Will it increase or decrease? How will the factors like sampling ...
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2answers
75 views

Speech SNR estimation

I'm trying to estimate SNR level in db to use it as a switch for an speech enhancement method that i'm working on. The noise level is not known and can be estimated using a posterior SNR algorithm. ...
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1answer
27 views

How to plot BER Vs SNR of a received signal

I am using USRP to transmit and received MIMO frames similar to Wi-Fi standard that I created on my own. After receiving the signal, it is processed as described in the standard. While I plot the ...
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24 views

Calculate SINR and Array-Gain for acoustic Beamforming in Matlab

I'm struggling to understand the equation and the reasons for this equation from Matlab's acoustic beamforming example. Here is the link: https://se.mathworks.com/help/phased/examples/acoustic-...
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65 views

How to find out the noise level of a signal

Is it possible to find the amount of noise or SNR of a signal from its time series output? For example; let x = randn(100,1) and ...
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1answer
32 views

The use of FDM for a single message signal

Suppose I have a single message signal, m(t), that is subjected to AWGN upon transmission. Is there any way that FDM (or any multiplexing strategy) can be used to ultimately improve the SNR of the ...
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55 views

Comparing the performance of a digital communication sim against a reference

I have a complex baseband simulation of binary FSK modulation and demodulation. The modulated signal $s[k]$ is computed as $$ s[k] = e^{-j2\pi f_ik/f_s} , i \in [0,1] $$ where the sampling rate is $...
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Dependence of correlation peak height on GPS C/A signal's SNR, noise floor level (dBFS), correlation period length and ADC resolution

Assuming correlation at 2X the chip rate (2046 chips per period) and 500 Hz frequency search bins. There are probably additional variables here that I'm missing and I'm not sure how to quantify a ...
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1answer
33 views

Variance of circular vector correlation

Say I have two zero-mean vectors, with a size of N and the translation between them is k. Say the image signal std is $\sigma_s$ and the noise std is given by $\sigma_n$. What is the variance of the ...
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192 views

Difference between formula of SNR and SQNR?

Is there any difference between formula/expressionsof SNR and SQNR? where SNR is Signal to noise ratio and SQNR is signal to quantization noise . The following DSP SE question shows both SNR and SQNR ...
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1answer
156 views

Ouput SNR of an integrator

Say I have an integrator with transfer function $\dfrac{\mathrm{F_s}}{s}$. This integrator has an initial condition zero and integrates from $t=0$ to $t=\dfrac{1}{Fs}$. If I apply a constant $V_{...
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1answer
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How to calculate SNR of dead-band quantizer?

Suppose we have a dead-band quantizer with $\ N = 5 \ quantizing \ levels $ which uses $\ b = 3 \ bits $ for each produced symbol. The quantizer gets as input a uniformly distributed signal $\ X $ ...
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1answer
118 views

SNR Signal to noise ratio of Pseudo random bit sequence (PRBS)

How should I estimate the Signal to noise ratio of a 20 Gbps NRZ PRBS pattern from power spectral density--where should I take the noise floor if I can assume well the noise is AWGN? I know roughly ...
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Coverage in terms of bitrate and MSC vs SNR in 5g

I'm working at a 5G coverage project and I need to define the relationship between the SNR - or SNIR - value and the MSC (modulation and coding scheme) as well as the transmission capacity. Can ...
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128 views

How to generate rayleigh fading coefficients in matlab

I want to calculate received SNR for each cellular user CUs, so i want the corresponding transmission power P of base station BS to each user, the noise, and the channel gain coefficient of the ...
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83 views

Mixing signal with noise in frequency space (STFT)

I am working on a preprocessing function which is supposed to mix two audio signals clean and noise in the context of neural ...
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1answer
51 views

SNR estimation prior to demodulation?

What are the standard ways to measure SNR, particularly before demodulation/synchronization?
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47 views

Adding Poisson noise to a time series signal

I'm working on a radiation detection problem. I have simulated some measurement count data and want to add an amount of Poisson background noise to achieve a certain SNR. Radiation count measurement (...
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1answer
42 views

Sample & Hold: Estimate jitter delay of an ADC

I've got a question regarding the effects of sample and hold. My input signal is $x$, and my output signal $x_{SH}$. The error between the signals is $e_{SH} = x_{SH}-x$. The sampling frequency is ...
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1answer
14 views

simulating directional interference to evaluate model performance

I have a model for audio processing. The model receives as input, a source, convolved with a room impulse response (RIR). I would like to test the performance of the model against inputs containing ...
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102 views

Measuring the SNR at output of matched filter

If I input a noisy signal with a calculated value of SNR, into a matched filter, then I get a matched filtered output, which should be a sinc function. I want to calculate the matched filtering gain ...
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Calculate SNR from packet error rate on micro-controller unit

I have the problem of calculating the Signal to Noise Ratio for a packeted transmission using FSK or BPSK modulation with convolutional coding on a micro controller unit which communicates with an RF ...
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Compute SNR for a noisy signal in Python [duplicate]

I have a discrete signal represented by an array in Python: $x \in R^N$. Now I add Gaussian noise to x: $x = x + np.random.normal(l=0, s=1, size=x.shape)$. How can I compute the signal-to-noise ratio ...

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