DIGITAL SPECTRUM ANALYZERS.
STANFORD UNIV CA STANFORD ELECTRONICS LABS
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This report describes several efficient techniques that use a digital computer to measure the spectrum of a time function. The time function forms the input to a group of linear difference equations that are solved by the computer. Each member of this group of equations passes frequencies over a different narrowband interval of the frequency range being analyzed, and the squared and integrated equation outputs provide an estimate of the spectrum. Truncation of coefficients to the length of the computer word may result in unstable difference equations, and a special form of these equations has been developed that is insensitive to coefficient truncation. The equation form has also been chosen so that a minimum of computation is required in the solutions.
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