1、 389-72011 7 ISO 389-7:2005Acoustics Reference zero for the calibration of audiometric equipment Part 7.Reference threshold of hearing under free-field and diffuse-field listening conditions(IDT) 27 2002 . 184- , 1.02004 . 1 - ( ) ,42 3583 -12011.671-4 389-7:2005 . -.7.- (ISO 389-7:2005 Acoustics Re
2、ference zero for the calibration of audiometric equipment Part 7: Reference threshold of hearing underfree-fieldanddiffuse-fieldlisteningconditions). -1.5(3.5).- -,5 , -.- () . , ,2012 , -II 389-72011 - . - , . 8253-1 8253-2. . , . - , 18 25 ., , :a) , - , ( ), ;b) 1/3- () - . 8 - ( ) , . , . , .III
3、 389-72011 7 State system for ensuring the uniformity of measurements. Acoustics. Reference zero for the calibration of audiometricequipment. Part 7. Reference threshold of hearing under free-field and diffuse-field listening conditions 201212011 , :a) ( ), , 8253-2. - ( ).b) (-) , 1/3- ( -) .c) , .
4、d) .1 8253-2 - (45 90), .2 1. 1/3- 20 16000 266 - 18000 . , , 389-1, 389-2, 389-5 389-8, , - . , - , .2 . - , . 8253-2 . . 2. (ISO 8253-2,Acoustics Audiometric test methods Part 2: Sound field audiometry with pure tone and narrow-band testsignals)1 389-72011 3 :3.1 (threshold of hearing): , -50%. .
5、, 389, 8253-1. .3.2 (ontologically normal person): - , , - , , .3.3 (reference threshold of hearing): 1/3- , 18 25 .3.4 (free sound field): , .3.5 (diffusesoundfield): ,- - .4 , 1, 1. 1/3- . - 1. 1 , 1, - f, c68 L = Tfc162Tf, ( ) Tf(. 20 ), c162Tf(. 20 Pa), 20 78,5a78,5 025 68,7 68,7 031,5 59,5 59,5
6、 040 51,1 51,1 050 44,0 44,0 063 37,5 37,5 080 31,5 31,5 0100 26,5 26,5 0125 22,1 22,1 0160 17,9 17,9 0200 14,4 14,4 0250 11,4 11,4 0315 8,6 8,4 0,22 389-72011 1 f, c68 L = Tfc162Tf, ( ) Tf(. 20 ), c162Tf(. 20 Pa), 400 6,2 5,8 0,4500 4,4 3,8 0,6630 3,0 2,1 0,9750 2,4 1,2 1,2800 2,2 1,0 1,21000 2,4 0
7、,8 1,61250 3,5 1,9 1,61500 2,4 1,0 1,41600 1,7 0,5 1,22000 1,3 1,5 0,22500 4,2 3,1 1,13000 5,8 4,0 1,83150 6,0 4,0 2,04000 5,4 3,8 1,65000 1,5 1,8 0,36000 4,3 1,4 2,96300 6,0 2,5 3,58000 12,6 6,8 5,89000 13,9 8,4 5,510000 13,9 9,8 4,111200 13,0 11,5 1,512500 12,3 14,4 2,114000 18,4 23,2 4,816000 40,
8、2 43,7 3,5a18000 73,2a 20, 1600 18000 -.3 389-72011 1 ( - ) 1/3- 389 1 - 0,1 . , , 226, .4 389-72011 () .1 20 12500 - , , 226. - 750 18000 226 15 , - (. .1). . 20 21, , - , 20 18000 - , -. .1 Tf 1. - . , , 226. -, , .1. .1 , , 5 389-72011.2 . / 43 (. 1219). .1 , 226 ( .1) 20 21 22 23 24 1956 1965 19
9、73 1991 2000 - , 25, 33, 50, 100,200, 500, 1000,2000, 3000,4000, 5000,6000, 7000,8000, 10000,12000, 1500063, 125,250, 500,1000, 2000,3000, 4000,5000, 6000,8000, 1000063, 125, 250,500, 1000,2000, 4000,80001000, 4000,8000, 9000,10000, 11 200,12 500, 14000,16000125, 250, 500,750, 1000, 1500,2000, 3000,4000, 6000,8000, 9000,10000, 11200,12500, 14000,16000 ()51(20)11( 18 24) 34 42b( 18 25)31( 18 25)31( 18 25) 200 : 120 .b . :a) , 12;b) , 6 , 13;c) :1) : , 20 , ,
copyright@ 2008-2019 麦多课文库（www.mydoc123.com）网站版权所有
备案/许可证编号：苏ICP备17064731号-1