Accession Number : ADA328843

Title :   Positive Time-Frequency Distributions: Development and Applications.

Descriptive Note : Annual progress rept. Oct 96-Sep 97,

Corporate Author : PITTSBURGH UNIV PA DEPT OF ELECTRICAL ENGINEERING

Personal Author(s) : Loughlin, Patrick J.

PDF Url : ADA328843

Report Date : SEP 1997

Pagination or Media Count : 6

Abstract : Results of our research into the development and application of the positive (Cohen-Posch) time-frequency distributions (TFDs) are presented. These include (1) the development of a new computationally efficient weighted least squares method of implementation; (2) the development of a method to design informative priors for constructing Cohen-Posch TFDs; (3) studies of the relationship between instantaneous frequency and the conditional mean frequency of the positive TFDs, and the definition of the average frequency at each time; (4) a TFD based method of classification for nonstationary processes; (5) a new multi-window time-varying spectral analysis method; and (6) applications of the Cohen-Posch TFDs and conditional moments to machine vibration analysis and transient characterization. Copies of relevant publications are attached to the report.

Descriptors :   *SIGNAL PROCESSING, *ACOUSTIC SIGNALS, ALGORITHMS, VIBRATION, TIME DEPENDENCE, LEAST SQUARES METHOD, SPECTRUM ANALYSIS, FREQUENCY DOMAIN.

Subject Categories : Acoustics

Distribution Statement : APPROVED FOR PUBLIC RELEASE