Emergency vehicle warning devices: interim review of the state-of-the-art relative to performance standards
United States. National Bureau of Standards. Building Research Division, E. T. Pierce, National Institute of Law Enforcement and Criminal Justice
U.S. Dept. of Justice, National Institute of Law Enforcement and Criminal Justice, 1972 - Technology & Engineering - 73 pages
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_ 7 _ _ I _ _ I I _ A-weighted ambient amplifier analysis anechoic chamber axis background calibration channel characteristics chromaticity coordinates circuit color color temperature complex reaction condensor microphone DB(A determined driver effective intensity emergency vehicle warning emergency warning lights feet filters goniometer horizontal I I I illuminance instrumentation intensity distribution Law Enforcement light source lighting unit linear located luminous intensity mechanical siren microphone minimum mounted noise operated output performance standards photocell photometer bar photometric measurements photometric testing photosensor pistonphone potentiometer preamplifier procedure produced by sirens radiation patterns recognition distance reflector rotating sample sector disk simulation siren signal sound levels produced sound pressure level spectral standard lamp target vehicle temperature test section test unit test vehicle traffic transmittance tristimulus vehicle warning devices vertical voltage warning equipment warning lamp