## The Measurement of Power Spectra, from the Point of View of Communications EngineeringAn unabridged and corrected republication of Part I and Part II of The measurement of power spectra from the point of view of communications engineering, which originally appeared in the January 1958 and March 1958 issues of volume XXXVII of the Bell system technical journal. |

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### Contents

PART IGENERAL DISCUSSION 1 Introduction | 1 |

Autocovariance Functions and Power Spectra | 7 |

The Practical Situation 1 7 | 9 |

Copyright | |

44 other sections not shown

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### Common terms and phrases

aliased analysis applied approximation autocovariance function average value bands Block calculation column computation consider constant continuous convenient corresponding covariance cycles degrees of freedom density desired differences discussed distribution effect ensemble equal equivalent estimates example expressed fact factor filter finite folding frequency follows formula Fourier transform frequency Gaussian given Hence input integral interval involves length linear linear combination lobe mean measurement method Mode modified multiples noise observations obtained operation original output pair Palf particular PEAK periodic pieces points possible power density power spectrum practical prewhitening procedure quadratic random range ratio reasonably record regarded result Section side signal simple single smoothing spaced specific spectral density spectral window square sums Table techniques theory tion transfer function transmission trend true usually variability variance width zero