In vibration analysis the PSD stands for the Power

**Spectral Density**of a signal. Each word is chosen to represent an essential component of the PSD. For example, the PSD of an**acceleration**signal is sometimes referred to as the**Acceleration Spectral Density**.Subsequently, one may also ask, what does the power spectral density mean?

**Power spectral density**. For continuous signals over all time, such as stationary processes, one must rather

**define**the

**power spectral density**(PSD); this describes how

**power**of a signal or time series is distributed over frequency, as in the simple example given previously.

What is the power of noise?

In telecommunication, the term

**noise power**has the following meanings: The measured total**noise**in a given bandwidth at the input or output of a device when the signal is not present; the integral of**noise**spectral density over the bandwidth. Interfering and unwanted**power**in an electrical device or system.What is auto power spectrum?

**Power spectral**density (PSD) is the metric on the y-axis of a calculated

**auto spectrum**(with frequencies along the x-axis). In other words, the PSD (y) is the amount of

**spectral power**explained by a given frequency band (x) in a time series.