Computation of atmospheric attenuation of sound for fractional-octave bands
Francis J. Montegani, United States. National Aeronautics and Space Administration. Scientific and Technical Information Office, Lewis Research Center
National Aeronautics and Space Administration, Scientific and Technical Information Office, 1979 - Music - 29 pages
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account for atmospheric acoustical data air-attenuated data air-attenuated spectrum atmospheric absorption band atmospheric attenuation band attenuation band center frequency band levels band number band sound pressure BAND SPECTRUM computer programs correct methods data is employed decibels denote discrete-frequency atmospheric attenuation equation 20 equations 14 extremely high frequencies filter characteristic filter skirt Fortran frequency attenuation frequency band Frequency Intervals function fundamentally for discrete-frequency hertz IBNF IDEAL FILTERS INCREMENT infer the spectrum integral expressions kilohertz layered atmosphere level relative Lj(r Log frequency lossless data METERS numerical integration numerical integration method OUTPUT DATA percent relative humidity power spectral density present method program BASPAT propagating sound propagation distance propagation path quency r)df reference relative humidity requires rms acoustic pressure scheme to infer shown slope sound pressure level specified spectrum analysis spectrum band spectrum shape subband levels subband sound pressure SUBROUTINE ATMAT tenuation tion unit distance upper band-edge variables