= Noise spectral density
{wiki=Noise_spectral_density}
Noise spectral density (NSD), often referred to as the power spectral density (PSD) when discussing signals, is a measure of the power distribution of a random signal or noise as a function of frequency. It characterizes how the power of a signal or noise is distributed across different frequency components. \#\#\# Key Points: 1. **Definition**: Noise spectral density quantifies the power of a noise signal per unit frequency.
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