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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Use SNR for Wav signals

I have implemented an audio steganography program in MATLAB. One way to evaluate your steganography method is to use SNR. The formula I found for SNR calculation is mentioned below. The problem is, ...
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30 views

Does the quality of the pictures taken by a USB 3.0 camera depend on cable length?

I've got a JAI GO-5000-USB camera and have tried several cable lengths, ranging from 40cm to 5m. So far, I haven't observed many differences in the quality of the pictures I've taken. Since I want ...
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23 views

SNR of Guassian PDF

Can anyone give me hints how to solve this? A/D converter involves two steps; sampling and quantization. I want to find the expression for SNR of a C-bit A/D converter round-off or truncation. The ...
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144 views

Calculating SNR for ECG signals

I'm reading through the literature for finding the best way to calculate SNR for a ECG signal. While there are many algorithms for improving SNR, I couldn't find any that details any standard ...
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105 views

How to calculate SNR before and after filtering for noise cancellation in an ecg signal in matlab?

I am working on noise cancellation in ecg signal and I want to calculate the Signal to noise ratio(SNR) before applying filter to the signal and after applying filter i.e., snr_before and snr_after. I ...
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48 views

How can noise be added to a signal to obtain a specific SNR?

How can I add noise to a recording to obtain a SNR value provided by the user? I am tryin to test the effects of noise on my algorithm. Is there any function or app for doing that kind of task? Thank ...
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1answer
41 views

Sampling rate effect on quantizer SNR

I am currently reading the 'Coding' chapter on Rabiner & Schafer's Book on speech processing. In one of its exercises, the reader is given a simple A/D converter using 16-bit uniform ...
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11 views

How do we find the SNRseg if I have a block with 2D in time domain

I always get the answer -.0017 and it suppose to have some negative number around 30. I get the average for the plane voice then the average for the difference between plain and the encrypted voice ...
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3answers
148 views

How to determine SNR from FFT of measured data?

I am doing impedance measurements, where I do a frequency sweep of a test current, and I measure the resulting voltage. Offline, I compute the FFTs of the voltage and current, and I want to make sure ...
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60 views

snr calculation when noiseless signal is not known

I have a noisy signal.Then using filtering techniques i got the estimated noiseless signal.I dont have the original noiseless signal.I have calculated snr the following way: ...
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2answers
136 views

'A priori' and 'a posteriori' SNR

I am reading this paper about speech enhancement using a minimum mean square error short time spectral amplitude estimator for our speech enhancement project. Basically in the paper they mix a clean ...
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130 views

How to calculate SNR of noisy signal?

Say, I have a noisy signal (clean signal + AWGN). When I pass this signal through my noise reduction program, I get the clean signal. My question is how to calculate the SNR before and after passing ...
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1answer
83 views

Confusion about how to calculate signal to noise ratio(SNR)?

I searched a lot but I didn't find a good answer. According to wikipedia SNR page, SNR can be calculated by both ratio of Power of clean signal to its noise Power either ratio of variance of clean ...
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135 views

Compare Overlapping FFTs to a longer FFT

How would you compare the SNR gain from a longer FFT (more samples) to overlapping FFTs? Given the choice, which one would you pick and why? Update: Suppose you have 2048 samples of a signal. ...
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1answer
141 views

Fixed SNR with unitary noise variance

I've just one question : How can I write a model like y = x + w,( with w a white gaussian noise) with a fixed SNR and a noise variance equal to 1. What coefficient may I have before x ? Thanks !
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1answer
320 views

How to calculate Signal-To-Noise Ratio

I am doing some analysis in python working with a photodiode. The signal is more or less periodic with some phase shifting in certain areas that give rise to faster or slower periods but overall still ...
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1answer
109 views

Generation of noise floor file for estimating signal-to-noise ratio of a wave file

I am trying to estimate the signal-to-noise ratio of a wave file (The wave file is a recording of a conversation in a room). I found examples where the Matlab scripts compare the wave file data to a ...
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1answer
89 views

Effect of noise and entropy

Relation of Entropy and SNR : Based on this question and answer, I had another question that struck me and I am curious to know, if somebody can shed some light, on the following situation: $y= ...
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1answer
86 views

Exercise related to frequency resolution and SNR

I'm studying a book aboud dsp and trying to make excercises. Here is one I'm interested in: A scientist acquires 65,536 samples from an experiment at a sampling rate of 1 MHz. He knows that the ...
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70 views

SINR averaging in communication system

Under the simulation of a communication system suffering from noise (AWGN) and co-channel interference, what is the appropriate way of calculating SINR? Could one calculate it at a packet level as: ...
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123 views

What is OSNR in Fiber Optics?

I have seen that the SNR is measured for optical fibers "OSNR". What is the difference? Is there any equivalent?
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83 views

Performance of adaptive signal processiong algorithm in noise not working

I am taking a course on signal processing and have been looking at various algorithms performance in presence of additive noise of different SNR. I was implementing Least Mean Square (LMS) algorithm ...
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2answers
651 views

Adding white noise to complex signal (complex envelope)

Good day everyone. So, i run in to trouble - how to add white noise to signal samples? For now i'm working with MSK signal - quadrature modulator and quadrature demodulator + viterbi processor. My ...
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65 views

Can I compute signal-to-noise ratio on a vector-valued or multi-channel signal?

I have a dataset that contains multiple channels recorded over time (think EEG or EMG), and I'm working on a computational model for this data. When I have a working version of the model, I'd like to ...
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4answers
3k views

Measure the SNR of a signal in the frequency domain?

How do you measure the SNR of a sinewave in the frequency domain? (Assuming no filtering.) Suppose: $$x(n) = s(n) + n(n)$$ Create the signal (nCycles of a sinewave) in MATLAB...: ...
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67 views

High SNR value unacceptable

I am stuck in a situation here while calculating received SNR in AWGN channel. When I performed calculations directly in decibels, I got very high SNR value for instance 140 dB. I am using the ...
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5answers
999 views

How to separate a low amplitude signal of same frequency but different phase

I have a signal consisting of two sine waves of same frequency but have different phase (and also a lot of hf noise). Their amplitudes differ by about 120dB. How to I go about separating them? SNR is ...
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477 views

Relationship between entropy and SNR

In general any form of enropy is defined as uncertainty or randomness. In a noisy environment, with increase in noise, I believe that entropy increases since we are more uncertain about the ...
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4k views

SNR calculation with Noise Spectral Density

I am having difficulty in calculating the SNR for the following scenario: In a cellular network Transmit power=36dBm Noise spectral density=-174dBm/Hz (AWGN) Bandwidth=10MHz I have some other ...
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1answer
108 views

Estimating SNR of an Environment where obtaining clean speech is not possible

is that possible to find SNR of an environment ? ie., i have a outdoor environment where i cannot find the clean speech ,if so i want to measure the signal power to noise power how to do that can i ...
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125 views

In Search of Voice Activity Detection Algorithms - What happens to the frequency or pitch or speech features as speaker moves away from microphone

Actually i am in search of a Voice Activity Detection Algorithm which could distinguish between voice and non-voice Roughly speaking it must not detect even a bullet sound,even a foot stepping and ...
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1k views

SINR calculation

I would like to calculate the total SINR of a IQ modulation system in time domain. $$ SINR = \frac{P}{N+I}$$ The blocks of the system are. Bit generation QAM modulation pulse shaper (sq root ...
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2answers
122 views

Estimating noise level without 'quiet' segment

I have a signal which consists of an onset and a release period. The onset, sounding like a thud, excites frequencies across the entire frequency range (0-22 kHz). It lasts for about 0.1 s. The ...
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1answer
446 views

simulation with SINR

I have a DS-CDMA system and the chip width is fixed but every user have a different spreading code length. I want to have a simulation of signal to interference noise ratio (SINR) VS. bit error rate ...
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151 views

Relationship between SNR and link speed

I've been trying to model some radio signal properties of wireless networks wrt its usefulness. For example, most WiFi network adapters would decrease their transmission rate if the overall quality of ...
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2answers
5k views

Power spectral density and SNR for AWGN

I have a GMSK modulator in MATLAB and wish to generate AWGN with a specific SNR, and I'm having some issues figuring out just how. I have found this step-by-step process to generate zero-mean ...
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3answers
4k views

SNR calculation confusion

Follow up to question and comments posted here The SNR calculation method posted as answers were implemented in matlab Implementation of Deve's answer: ...
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25k views

how do I calculate SNR of noisy signal?

I am having problems in understanding how to do it practically I have a wav file that contains pure speech and another ave file that just contains the background noise (can be various things, such as ...
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1answer
518 views

I have a noisy ECG Signal. want to use PSD to analyse the Signal to noise ratio

I have a really noisy ECG Signal which contain, motion artifacts,muscle noise, a very high amplitude noise. I am beginner to DSP. Can someone tell me in a simple language,how do i interpret the ...
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4answers
17k views

What is meant by 20 dB signal-to-noise ratio?

I'm reading a paper in which a discrete signal $$x(n) = s(n) + w(n)$$ is considered. $s(n)$ is a known, deterministic series, and $w(n)$ is white noise with zero mean. The authors write that ...
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1answer
201 views

Questions on the generation of R.O.C. curves

In my foray into detections, I am trying to understand how best to generate receiver operating characteristic (ROC) curves, and some questions have come up. In my studies, I have found out that ROC ...
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443 views

How to define SNR for multiple signals in noise?

I have to estimate the number of signals present in a measurement contaminated by additive noise given $n$-dimensional snapshot vectors $\bf x$, modeled as $ \bf x = \bf A \bf s + \bf z $ where $\bf ...
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1answer
892 views

How to find quantization noise in my simulation?

For college we have to make simple exercise in simulink (matlab). (since my professor is not familiar with simulink, he can't help). The question itself is, how can I simulate the SNR when uniform ...
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2answers
393 views

How can you tell whether there's a signal (when your signal looks a lot like noise)?

This is my snoring detector again. I've gotten pretty good at detecting a signal when there's anything there -- can track from a wall-peeling snore down to breathing you can't even hear in the ...
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1answer
834 views

How to estimate the signal-to-noise ratio of a waveform?

I have a signal: $f_i(t_i=i\Delta t)$, where $i = 0\ldots n-1$. The signal seems to vary quickly around a slower varying "trend". I am assuming that the quickly varying part is noise and the slowly ...
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648 views

What are the various definitions for SNR, and their associated methods for measuring it?

The definition of SNR seems to be somewhat of a tower of babel in industry. What definitions of SNR are there (feel free to site application), and how exactly can it be measured for that applications? ...