Power Spectral Density

Power Spectral Density (PSD) describes how the power of a signal is distributed across different frequencies. Imagine listening to a piece of music and noticing which notes (frequencies) are most prominent; PSD quantifies that for any signal, showing where its energy is concentrated. It's useful for analyzing signals in fields like communications, audio engineering, and physics, helping to identify the dominant components and understand the signal's behavior in the frequency domain. Essentially, PSD provides a snapshot of how signal strength varies with frequency, aiding in characterization and filtering.