What is "multitaper"

n. (context signal processing English) A technique to estimate the power spectrum of a stationary ergodic finite-variance random process, using several different data tapers which are orthogonal to each other.

In signal processing, the multitaper method is a technique developed by David J. Thomson to estimate the power spectrum S of a stationary ergodic finite-variance random process X, given a finite contiguous realization of X as data. It is one of a number of approaches to spectral density estimation.