Summary Report on Emergency Vehicle Sirens: Prepared for the National Institute of Law Enforcement and Criminal Justice, Law Enforcement Assistance Administration, U.S. Department of JusticeU.S. Department of Justice, Law Enforcement Assistance Administration, National Institute of Law Enforcement and Criminal Justice, 1975 - Emergency vehicles - 47 pages |
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... difference in DR between the 0 ° direction and the ± 45 ° directions exceeded ± 10 dB ( rounded to the nearest whole dB ) in two cases ( the difference was 12 dB in each of the two cases ) . For the center frequencies 500 and 1000 Hz ...
... difference in DR between the 0 ° direction and the ± 45 ° directions exceeded ± 10 dB ( rounded to the nearest whole dB ) in two cases ( the difference was 12 dB in each of the two cases ) . For the center frequencies 500 and 1000 Hz ...
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23 test automobiles 3-octave band A-Weighted Adjusted for Spherical anechoic chamber arithmetic mean sound attenuation Band Center Frequency Bureau of Standards Camp A.P. Hill continued).-Directionality Plots Corliss and Jones Criminal Justice decibels destructive interference difference in DR directional response Directivity Index distance distribution effective loudness Electronic Siren Speakers emergency vehicle sirens Enforcement and Criminal Enforcement Assistance Administration equation equivalent sound power estimation f(max far-field field insertion loss four electronic sirens fundamental frequency geometric mean Institute of Law Law Enforcement Standards LESL linear linear least squares logio loudness of 65 loudspeaker masked threshold Masking Noise Level masking noise measurements maximum mean sound pressure microphone minicomputer National Bureau nine electromechanical sirens octave phase cancellation Required Signal Sound response and sound Signal Sound Pressure Sine Wave siren signal sound Siren Speakers Mounted sirens tested sound level sound power level sound pressure level Speakers Mounted Side spherical spreading subject vehicle test program