In practice, the population spectral density function cannot be computed. There are many ways of computing the sample spectral density function. The TSBAYSEA and TSMLOCAR calls compute the power ...

In effect, the movement of electrons in a material thanks to thermal energy produces noise across the spectrum. Reducing interference from Johnson noise is why telescopes often have their sensors ...

Having suffered from a really annoying blast of RFI across wide swaths of the radio spectrum ... power at a moment’s notice — he was greeted by blessed relief from all that noise.