Accession Number : AD0713190

Title :   A PROCEDURE FOR COMPUTING AND DISPLAYING TIME VARYING POWER SPECTRA ILLUSTRATED BY APPLICATION TO A GEOPHYSICAL PROCESS.

Descriptive Note : Technical rept.,

Corporate Author : JOHNS HOPKINS UNIV BALTIMORE MD CHESAPEAKE BAY INST

Personal Author(s) : Wilson,Donald G.

Report Date : AUG 1970

Pagination or Media Count : 45

Abstract : Computing time dependent power spectra is an important method for studying nonstationarities in signals. An efficient procedure for computing such spectra and displaying them immediately is requisite for effective application. The method presented is based on a date window which moves along the signal in unit increments. The spectrum is updated for each new sample. All spectra are displayed on a computer graphic terminal and the algorithm was deliberately constructed to make computer graphic display efficient. (Author)

Descriptors :   (*OCEAN WAVES, POWER SPECTRA), (*TIME SERIES ANALYSIS, GEOPHYSICS), INTEGRAL TRANSFORMS, FOURIER ANALYSIS, SERIES(MATHEMATICS), DIGITAL COMPUTERS, DATA PROCESSING, ALGORITHMS, REAL TIME

Subject Categories : Physical and Dynamic Oceanography
      Computer Hardware

Distribution Statement : APPROVED FOR PUBLIC RELEASE