Stack Exchange Network

Stack Exchange network consists of 175 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.

Visit Stack Exchange

The Power Spectral Density (PSD) is the distribution of signal power over frequencies.

It is often estimated by sampling a signal for a finite amount of time, taking the Discrete Fourier Transform (DFT) of the resulting sample vector, and considering the magnitude square of the resulting DFT bins.

Notice that this is, for a random signal, a property of the stochastic process underneath. See: Wiener-Chintschin theorem.

history | excerpt history