KS C IEC 61158-6-12-2011 Industrial communication networks－Fieldbus specifications－Part 6-12：Application layer protocol specification－Type 12 elements《工业通信网络 现场总线规范 第6-12部分 数据链路层协议.pdf

1、 2003 2 14 C IEC 60268 13 2003 2003 2 14 03 84 ( ) ( 02 509 7325) . 7 5 , . ICS 33.160.50 KS C IEC 60268 13 2003 Sound system equipment Part 13 Listening tests on loudspeakers IEC . , . 1, 2, , 3, , “ ” , 1 2 3 . 3 . 3 IEC 60268 13 IEC 100 , 100C , . . 100C/121/CDV 100C/210/RVC . 3 . . . , 2 , , , T

2、V . , , . . . . “ ” . , , , . , C IEC 60268 13 2003 . , AES 20 , . , , . . , . . . . . IEC 60651 1979, Sound level meters ISO 1996(all parts), Acoustics Description and measurement of enviromental noise ISO 3382 1997, Acoustics Measurement of the reverberation time of rooms with reference to other a

3、coustical parameters AES 20 1996, AES recommended practice for professional audio Subjective evaluation of loudspeakers . , . 60 , , 2 . . , ( ) . . . . , . 2 C IEC 60268 13 2003 , . (W/H) (L/H) (4.5(W/H) 4) L H W , L/H3 , W/H3 . , , . / / , / . , . 2 , 25 m 2 40 m 2 , 30 m 2 45 m 2 . , . L = 7.0 m

4、W = 5.3 m H = 2.7 m . , , . . . , . “ ” . , T . T 1/3 ISO 3382 . . 200 4 000 Hz T m 0.3 0.6 . , . T m 0.4 . 3 C IEC 60268 13 2003 Hz 63 8 000 Hz T m . , . . , , , . . . . 1/3 10 kHz 0.3 dB . . . . . 18 27 25 75 % : 86 106 kPa ( , , ) NR 15 . 20 25dB A SPL . , , . 4 C IEC 60268 13 2003 Hz NR 10 ( 20

5、Pa) dB NR 15 ( 20 Pa) dB 31.5 62 65 63 44 47 125 31 35 250 21 26 500 15 20 1 000 10 15 2 000 7 12 4 000 4 9 8 000 2 7 NR( ) ISO NR ISO R 1996 . . , . , , , . , . / . . , . . , . , ( 1 m ). . , , . . . 2 m 3.5 m . 3 m . , , ( , ) . ( ) . 2 4 m . . 5 C IEC 60268 13 2003 , 0 , 110 . . , , 0 90 . 2.5 3.5 m . , . . . 1 m, 2 m, 1.5 m . , , . , . , , . , , . , . . , . . , / . ( ) . . (0.5 dB ) . , IEC 60651 ( B , 1 , ). ,