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发帖数: 3382 | 1 If high order statistics are taken into consideration,
white noise definition needs to be reconsidered.
We can define white noise if it's not correlated
to other time. In this way, it does not have to be stationary,
and spectrum does not exist.
Also, white noise is relevant to bandwidth. There is no
physical infinite bandwidth signal. Therefore, "whiteness"
is always with respect to the sampling rate of the signal.
If a signal is filtered at B bandwidth continuously,
then sampled at double of th | z*****n
发帖数: 7639 | 2 White noise is a signal or process with a flat frequency spectrum. In other
words, there is equal energy in a given bandwidth at any centre frequency. In
time domain, the magnitude of a white noise process has normal distribution.
In digital signal processing, almost all types of noise are often approximated
with white noise since it has several useful statistical properties. For
example, it is statistically uncorrelated in time with any other signal,
including itself.
In practical applications |
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