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30 June A-weighted absorption active noise control aircraft noise algorithm analysis annoyance attenuation average binaural boundary calculated cavity characteristics coefficient components concert halls correlation curve dB(A density diffraction diffuse direct sound distribution effect energy engineering environmental environmental noise equation evaluation experimental factor Figure filter frequency range HRTFs impedance impulse response increase INRETS insertion loss listening located loudness loudspeaker low frequency measured method microphone modes noise barriers noise control noise exposure noise level noise sources Norway 26 obtained octave band panel parameters plate porous prediction problem radiated reduced reflections resonance reverberation road surface room acoustical scale secondary sources shown shows signal simulation sleep sound field sound level sound power level sound pressure level sound propagation sound source spatial spectra speed structure traffic noise transfer function Trondheim tyre values variables velocity vibration wall wave