Howtosignalprocessing
How do you calculate variance from SNR?
Signal-to-noise ratio is also defined for random variables in one of two ways. X = s+N\ , where s\ , the signal, is a constant and N is a random variable having an expected value equal to zero. The SNR equals s^2/\sigma^2_N\ , with \sigma^2_N the variance of N\ .
How can I improve my SNR ratio?
Reducing Signal to Noise Ratio (SNR)
The SNR can be improved by either increasing the overall amplitude of the signal before the noise is introduced into it, or by reducing the amplitude of the noise. A common source of noise in many applications is the measurement device.
What factors influence SNR?
The SNR is affected by such factors as the volume of the voxel, the bandwidth, and the number of signal averages (NSA).
