HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Full Text (PDF) References Services Email this article to a friend Similar articles in this journal Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via HighWire Citing Articles via Google Scholar Google Scholar Articles by EHRENBERG, J. E. Articles by HERNANDEZ, E. N. Search for Related Content GeoRef GeoRef Citation

Covariance-invariant digital filtering—A better digital processing technique for ground motion studies

DEPARTMENT OF ELECTRICAL ENGINEERING AND APPLIED PHYSICS LABORATORY UNIVERSITY OF WASHINGTON, SEATTLE, WASHINGTON 98195
TERRA TECHNOLOGY CORPORATION, 3860 148TH AVENUE N.E., REDMOND, WASHINGTON 98052

Abstract

This paper describes a new recursive digital algorithm for computing the response spectrum from acceleration data. The algorithm digitally implements a single degree of freedom oscillator using a covariance-invariant digital filter. It is shown that this technique will produce an accurate response spectrum from input data that have been sampled at a rate that is as low as three times the oscillator natural frequency, f_n. The more common response spectrum digital filter obtained using a bilinear z transformation technique requires a sampling rate of ten times f_n. The fact that the algorithm can be used for data with a low sampling rate makes it particularly well suited for real time, multi-frequency calculation of response spectra with a microprocessor system.

This article has been cited by other articles:

				J. L. BECK Comments on "covariance-invariant digital filtering--a better digital processing technique for ground motion studies," by J. E. Ehrenberg and E. N. Hernandez Bulletin of the Seismological Society of America, August 1, 1982; 72(4): 1445 - 1446. [PDF]