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/ Klaus Hejbjerg * s - a - ' a - a a a A a - 5 - � a If a a - - - - - - - - - - Fig. 1. Illustration of the multispectrum concept . i a a a a 5 3 a Fig. 2. Illustration of averaged multispectrum a a a a a Fig. 3. Typical measurement set-up for a reverberation time mea- Fig. 4. Instrumentation for reverberation time measurements ac- surement using interrupted noise cording to the interrupted noise method 2 4 881562 Fig. 5. Reverberation decay with evaluation range used in calculations of reverberation time 5 5 5 = = = ^ L i , ^ , , . big.b. never Deration time calculation using the function Reverb. Y 1a h c £ a e A a a A a ^£~ Typical measurement set-up for a reverberation time measurement using impulse exci- ^ tation 7 a 8 A 3 Fig. 8. Instrumentation for reverberation time measurements according to Schroeder's method of integrated impulse response Backwards integration of the same decay as Fig. 7 and using the delta cursor for calcu- SitlO lation of the reverberation time i []L - = + + men - - a Journal of the Acoustical Society of America a , �