Emergency Vehicle Warning Devices: Interim Review of the State-of-the-art Relative to Performance Standards, Volume 501
U.S. Department of Justice, National Institute of Law Enforcement and Criminal Justice, 1972 - Automobiles - 73 pages
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A-weighted analysis anechoic chamber Appendix background calibration capacitor capacitor discharge characteristics chromaticity coordinates color complex reaction DB(A decibels determine developed driver effective intensity electronic siren emergency vehicle warning emergency warning devices emergency warning lights Figure fire chief's vehicle flashing light frequency front fundamental frequency goniometer harmonic structure HERTZ horizontal horns illuminance incandescent lamp instrumentation intensity distribution intensity is normalized Law Enforcement lenses Lighting Devices lighting unit literature search located luminous intensity mechanical siren microphone mounted operated output parabolic reflector performance standards photo sensor photocell physical potentiometer preamplifier produced by sirens radiation patterns range recognition distance reflector rotating sample signal effectiveness simulation Single incandescent bulb siren signal sound levels produced sound pressure level spectral standard lamp standards and specifications tape recorder target vehicle Test Program test section test vehicle traffic tristimulus types vehicle warning devices visual voltage warning equipment Warning Lamp warning signals