Calculation of frequency spectra by Blackman-Tukey methodThe frequency spectra are usually estimated by the Blackman-Tukey method,which is based on the Wiener-Khinchine theorem. The Blackman- Tukey procedurerequires calculations in the following steps (Massel, 1996):1. Subtracting a mean value from digital data2. Calculating the autocorrelation function: trend removing and filtering
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