Accession Number : ADD018556
Title : Spectral Processor and Range Display Unit.
Descriptive Note : Patent, Filed 27 Dec 95, patented 18 Mar 97,
Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC
Personal Author(s) : Lopes, Joseph L ; Paustian, Iris C
Report Date : 18 Mar 1997
Pagination or Media Count : 25
Abstract : An apparatus for convening the difference frequency between the transmit pulse of a sonar and the return or receive signal from a target to a video representation complementing the audio output of the sonar representing the difference frequency. The audio and complementing video signal indicate the presence of the target and its range. The invention converts the audio signal to a frequency spectrogram by means of digital signal processing including a FFT algorithm. The amplitudes of the frequency components of the audio signal are plotted on the video display of the invention. They are color-coded to indicate the amplitude of the audio signal. The frequency of the audio signal is related to the range of an object detected by the sonar. The invention is mobile and easily managed by a diver.
Descriptors : *VIDEO SIGNALS, *SONAR, *PATENTS, *UNDERWATER TARGETS, SIGNAL PROCESSING, DIGITAL SYSTEMS, DISPLAY SYSTEMS, SPECTRA, IMAGES, SPECTROGRAPHY, AUDIO FREQUENCY
Subject Categories : Information Science
Acoustic Detection and Detectors
Distribution Statement : APPROVED FOR PUBLIC RELEASE