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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Estimate SNR of Spread Waveform?

Suppose you have a sinewave at an aribitrary frequency, $f_0$, and you spread it (chip it) with a spreading code of length, $N$, with an arbitrary chip rate: What is the loss in SNR as a function of ...
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Signal-to-Quantization Noise ratio

What is the formula of the signal-to-Quantization Noise ratio for a quantizer as shown in the figure below (input being the top and output being the bottom figure) Do different quantizer types have ...
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Signal to noise ratio toolbox [closed]

What audio signal processing toolbox do you suggest for valid insertion noise to signal with varying SNR? I am in search of a good toolbox for Matlab for SNR computation.
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128 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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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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391 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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Relationship between entropy and SNR

Dynamical entropy Kolmogorov entropy is defined as the supremum of the Shannon entropy over partitions of the phase space. In general any form of enropy is defined as uncertainty or randomness. In a ...
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433 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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72 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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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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483 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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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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218 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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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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2k 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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2k 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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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
348 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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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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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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349 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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572 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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311 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
605 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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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? ...