1
$\begingroup$

Am studying unbiased estimators and keep seeing this term "DC Level". What is the expansion of DC and what is a DC Level? Even the Wikipedia page on WGN says nothing about it.

$\endgroup$

2 Answers 2

2
$\begingroup$

DC level in signal processing refers to the average or the mean value of a signal. So a zero-mean signal will have an average value of zero over its domain of definition.

When this concept is extended to the stochastic processes, we shall distinguish between time average and ensemble averages. A stochastic process can be viewed as an ensemble of time functions and a sequence of random variables. When a stochastic process is assumed to be ergodic, then its time averages over a sample function equal its ensemble averages over the random variables. In such a case the zero-mean random process creates time functions which have zero averages, hence zero DC levels.

$\endgroup$
1
$\begingroup$

Ok found out myself from a book. DC refers to Direct Current which is equivalent to a constant function. So when saying DC level A in noise, we say we are observing a pattern that resembles direct current of certain constant value plus white gaussian noise.

$\endgroup$

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge that you have read and understand our privacy policy and code of conduct.

Not the answer you're looking for? Browse other questions tagged or ask your own question.