KS F 2864-2012 Measurement of the reverberation time of rooms with reference to the other acoustical parameters《混响室内混响时间和声学变数测定方法》.pdf

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1、 KSKSKSKSKSKSKSK KSKSKS KSKSK KSKS KSK KS KS F 2864 KS F 2864:2012(MOD ISO 3382:1997) 2012 9 13 http:/www.kats.go.krKS F 2864:2012 : ( ) ( ) ()ANC () LH ( ) : (http:/www.standard.go.kr) ： ：2002 6 7 ：2012 9 13 2012-0424 ： ： ( 02-509-7274) (http:/www.kats.go.kr). 10 5 , . KS F 2864:2012 i ii 1 1 2 1 3

2、 .1 4 .3 4.1 .3 4.2 4 4.3 5 5 .7 5.1 .7 5.2 7 5.3 .8 6 9 6.1 9 6.2 .10 6.3 .10 6.4 (detector) 11 7 .11 8 .11 8.1 11 8.2 12 A( ) .13 A.1 .13 B( ) 19 B.1 .19 B.2 IACC .19 B.3 19 B.4 IACC .20 B.5 20 KS F 2864:2012 .21 KS F 2864:2012 ii , 1997 2 ISO 3382, Acoustics Measurement of the reverberation time

3、of rooms with reference to the other acoustical parameters . A( ) , , ISO 3382 A . B( ) , (耳 ) . KS F 2864:2012 (MOD ISO 3382:1997) Measurement of the reverberation time of rooms with reference to the other acoustical parameters 1 (RT) , (SPL) , (D50), (STI), (LEF), (IACC) . 1 , , . 2 , , . 3 . 2 .

4、. ( ) . KS C IEC 61672 1, ( ) 1： ISO 5725 2： 1994, Accuracy (trueness and precision) of measurement methods and results Part 2：Basic method for the determination of repeatability and reproducibility of a standard measurement method IEC 61260, Electroacoustics Octave-band and fractional octave-band f

5、ilters ITU Recommendation P.58： 1994, Head and torso simulator for telephonometry 3 . 3.1 (decay curve) 1 , (reverse time integrated squared impulse response) . 2 . KS F 2864:2012 2 . . 3.2 (interrupted noise method) , 3.3 (integrated impulse response method) 3.4 (impulse response) , . MLS . 3.5 (re

6、verberation time) T 5 dB 35 dB (linear least squares regression) , 60 dB s , 5 dB 35 dB . 35 dB , , 5 dB 25 dB . T20 , 5 dB 35 dB T30 . 3.6 (sound pressure level) SPL 3.7 (deutlichkeit) D50 , 50 ms D50 STI, LEF, IACC A B . 3.8 (sound transmission index) STI KS F 2864:2012 3 3.9 (lateral energy fract

7、ion) LEF 8 3.10 (inter-aural cross correlation) IACC 1 , 0 1 3.11 (state of occupancy) 1 , . 2 . 3 “ ” “ ” , “ ” “ ” . . 3.11.1 (unoccupied state) , . , . 3.11.2 (studio state) . . 3.11.3 (occupied state) 80 % 100 % , . 4 4.1 . , . 1 5 % . . ， . KS F 2864:2012 4 4.2 4.2.1 . , (3.5 ). . (Pseudo Rando

8、m Sequence) . , 45 dB . T20 , 35 dB . 4.2.2 , , , , , . 4.2.2.1 KS C IEC 61672 1 1 . 1/3 IEC 61260 . 26 mm , . 4.2.2.2 , . . . a) 3 dB . b) . 50 dB . 2 % 100.01n . n 0 . 1 1/3 , n 3 1 . 2 , 4.2.2.3 T . . 3 , KS F 2864:2012 5 . 4.2.2.3 ( , ) . a) b) c) ( , .) T/20 , T/20 . T/7 . T , 3.5 . , 1.5 . 45

9、. 1 4.34 dB/s . 2 . 3 , T/20 . T/7 . . , . 4.2.2.4 . . 4.3 , . , 2 m . 1/4 , 1 m . , . dmin . KS F 2864:2012 6 dmincTV2 .(1) V ： (m3) c ： (m/s) T ： (s) . , , . . . 4.3.1 , (sound reduction index) , . . . 4.3.2 . . . . , . , . . a) b) , , . 1.2 m . 1 a) 50 % , . KS F 2864:2012 7 2 b) 10 % , . 3 1, 2

10、, . 5 5.1 . , . , . , , . 63 Hz 4 kHz . 100 Hz 5 kHz 1/3 . 5.2 5.2.1 , . , , . . 1 , 1/3 1/3 . . 88 Hz 5 657 Hz (1 100 Hz 5 kHz , 1/3 125 Hz 4 kHz ), 1/3 . , 1/2 . . , . 5.2.2 . , . . KS F 2864:2012 8 , (squared) , . . 3 , 18 . , . 5.3 5.3.1 . , . . 5.3.2 , 5.2.1 . 45 dB . T20 35 dB . . . , (tone sw

11、eeping) MLS (maximum length sequence) (Psuedo random noise) . . , . 1 , 1/3 1/3 . . 88 Hz 5 657 Hz (1 100 Hz 5 kHz , 1/3 125 Hz 4 kHz ), 1/3 . 5.3.3 (backward integration) . , (t), . E(t )=ttpp )(d)(d)(22 (2) KS F 2864:2012 9 p： (reverse time) (integral) . = ttppp02022d)(d)(d)( (3) . a) T0 . E(t)+tTtp02)(d)( (4) T0 1/5 . . 25 % , . t1 , . , (noise floor) . 10 dB . 25 dB T20 , 35 dB(25 dB 10 dB) . b) , t1 , . E(t )+ttCp12)(d)( (4) , t 16 T2Tdet . B ： Tdet ： (averaging detector) . BT8 TTdet 4.2.2 . BT4 TTdet/4 . 7