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Periodogram: A method for estimating the power spectral density of a signal by taking the squared magnitude of its Fourier transform.

Windowing: A process applied to segments of a signal to minimize spectral leakage, often used in conjunction with spectral estimation techniques like Welch's Method.

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Power Spectral Density (PSD): A measure that represents the distribution of power of a signal as a function of frequency, indicating how power is distributed across various frequency components.

Welch's Method is a technique used for estimating the power spectral density (PSD) of a signal by dividing the signal into overlapping segments, computing the periodogram of each segment, and then averaging these periodograms. This approach reduces the variance of the spectral estimate compared to a single periodogram, providing a smoother estimate of the PSD, which is crucial for analyzing signals in various applications.