Abstract: A spectral analysis system includes a Fast Fourier Transform (FFT) processor which receives a time domain signal and provides a specified number of initial signal strength estimates, each of the initial estimates being equal to one of the frequency domain coefficients of the Fast Fourier Transform of the time domain signal which is generated when the time domain signal is sampled at a number of intervals equal to the number of initial estimates, over a time period of specified duration. The system further includes an adjustable window element receiving a selected number of the initial estimates for sensing or detecting the presence of a leakage component in a given one of the initial estimates, and for providing an adjusted signal strength estime, the adjusted signal strength estimate comprising the difference between the given initial estimate and the leakage component.