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FAST FOURIER TRANSFORM ALGORITHM
AVERAGING FOR BETTER RESOLUTION
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2N points 2N-point analysis algorithm AMPSUM auto-correlation auto-covariance BOTHSUM called co-spectrum complex amplitudes COMPLEX FOURIER COMPLEX NUMBERS Control Data Corporation Cooley CROSS POWER SPECTRUM cross-correlation cross-power spectrum DATASUM digital computer digital filters DIGITAL SPECTRAL ANALYSIS DIMENSION 2**M Dirac comb Equation even-indexed points Fast Fourier Transform Fourier Amplitude Spectrum FOURIER ANALYSIS Fourier coefficients frequency content frequency f Goddard Space Flight Goertzel's Hanning function HARM HARM HARM Hertz IN)A indexed points IX)A JDIF JSTEP L=l HARM linear interpolation linearly interpolated N-point array N/log2N N2 REWIND N3 OCTAVES odd-index points ODDBOTHS Parseval's equality PARSEVaLS EQUALITY phase power spectral density PROGRAM quadrature spectrum REAL ARRAY RETURN END Appendix REWIND Nl REWIND routine samples per second sampling density sampling rate SCRATCH TAPE SET BY USER signals Space Flight Center spectral window Subroutine ALIASING Subroutine COVAR Subroutine DOUBLE Subroutine FOURIER Subroutine HANNING subroutine HARMON Subroutine POWER VECTOR zero ZN9X