# 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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### 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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### 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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### 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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### 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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### 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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### 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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### 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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### 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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### 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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### 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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### 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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### 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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### 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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### 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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### SNR estimation prior to demodulation?

What are the standard ways to measure SNR, particularly before demodulation/synchronization?
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### 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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### 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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### 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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### 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 ...
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 ...