3
$\begingroup$

What are some of the reasons why DC offset is considered undesirable for a timeseries signal other than wastage of power during transmission ? Specifically, How does it cause spectral leakage and out of band emissions ?

$\endgroup$
2
$\begingroup$

In a mathematical sense it doesn't but (almost) any nonlinear interaction, say modulation or demodulation, will cause additional signals, leakage/out of band, signals. The point is that when you do the evaluation you must include the modulator or demodulator; as well as things like transformers which will be biased off center and thus generate extra distortion. It's the non-linearities in the overall signall path that induce extra signals. By definition of the Fourier/Laplace transform superposition and linearity properties a linear system will not generate extra signals.

$\endgroup$
1
$\begingroup$

A signal with a DC-offset does not have a zero-mean. In audio & statistical signal-processing for example, many analysis and effect-processing algorithms make assumptions that the signal is zero-mean. A DC-offset-remover is a common pre-processing step, to ensure the correctness of algorithms further along in an effect chain.

$\endgroup$

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

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