Accession Number : ADA303658

Title :   The Effect of Monitor Type and Display Orientation on the Detection of Lines on a Simulated Passive Sonar Display.

Descriptive Note : Technical rept.,

Corporate Author : DEFENCE AND CIVIL INST OF ENVIRONMENTAL MEDICINE DOWNSVIEW (ONTARIO)

Personal Author(s) : McFadden, Sharon M. ; Giesbrecht, Barry L. ; Kalmbach, Karen C.

PDF Url : ADA303658

Report Date : OCT 1995

Pagination or Media Count : 29

Abstract : With current sonar technology the operator must handle large quantities of data. The primary medium for displaying these data is the CRT. Because of the limited space available on the CRT, the operator must scan multiple pages of data rapidly if he or she is to monitor all of the information. Thus, signal visibility is critical. To ensure good visibility, it is necessary to understand the impact of display characteristics on the detectability of signals on a display. This study examined two factors that could influence the detection of lines on a frequency-time-intensity (Fr') display. The first was type of monitor - multichrome or monochrome. Current systems use a monochrome monitor because its resolution is believed to be superior to a multichrome monitor. The second was orientation of the signals relative to the orientation of the CRT raster. Currently, the signals on an Fr' display are perpendicular to the CRT raster. The study examined the advantage of having signal lines on the Fr' display fall along the scan lines of the CRT. Two experiments were carried out to assess the effect of these factors on the detection of signals of varying strength presented on a simulated FYI display. Performance was similar on the monochrome and multichrome monitors. However, there was a slight advantage, about 1 dB, to using a display format in which the signals fell along the scan lines of the CRT. This improvement increased to 2 dB for signals that were separated by one pixel from a stronger signal. It was concluded that detection was not impaired on a multichrome display and that there could be an advantage to designing the interface for a passive sonar display so that the signals fall along the scan lines of the CRT.

Descriptors :   *CATHODE RAY TUBES, *PASSIVE SONAR, SIMULATION, DETECTION, MONITORING, ORIENTATION(DIRECTION), DISPLAY SYSTEMS, SIGNALS, VISIBILITY, FORMATS, SONAR, MONOCHROMATIC LIGHT, RASTERS.

Subject Categories : Computer Programming and Software
      Acoustic Detection and Detectors

Distribution Statement : APPROVED FOR PUBLIC RELEASE