Accession Number : AD0779876

Title :   Random Frequency Function Generation.

Descriptive Note : Interim rept.,

Corporate Author : NAVAL RESEARCH LAB WASHINGTON D C

Personal Author(s) : Gerlach,A. A.

Report Date : 30 APR 1974

Pagination or Media Count : 20

Abstract : The desired signature characteristics of the source generator for use on a long-range acoustic propagation experiment are defined. A programmable frequency function is proposed, consisting of slowly varying frequency undulations whose rate and magnitudes are pseudo-randomly distributed. The power spectral density and other significant properties of the frequency function are derived and displayed in both tabular and graphical form. A method is presented of implementing the random frequency function generator which uses a digital programmable read-only memory as its central element. The function generator is simple and reliable in concept and circuit, and should find application in a variety of underwater acoustic experiments. (Author)

Descriptors :   *Sound transmission, *Underwater sound, Signal processing, Power spectra, Pseudo random systems, Probability density functions, Information theory, Signal generators

Subject Categories : Test Facilities, Equipment and Methods
      Acoustic Detection and Detectors
      Acoustics

Distribution Statement : APPROVED FOR PUBLIC RELEASE