1、 389-42011 4 ISO 389-4:1994Acoustics Reference zero for the calibration of audiometric equipment Part 4:Reference levels for narrow-band masking noise(IDT) 27 2002 . 184- , 1.02004 . 1 - ( ) , 42 358 3 1 2011 . 671-4 389-3:1994 . - . 4. - (ISO 389-4:1994 Acoustics Reference zero for the calibration
2、of audiometricequipment Part 4: Reference levels for narrow-band masking noise). - 1.5 ( 3.5). - - , 5 , - . () . - , , 2012 , - - II 389-42011 389-1:1991 389-2:1994 - . 389-3 . - . , - . 60645-1 - , . , , , . . . , , . , - , - . .III 389-42011 4 Statesystemforensuringtheuniformityofmeasurements.Aco
3、ustics.Referencezeroforthecalibrationofaudiometricequipment.Part4.Referencelevelsfornarrow-bandmaskingnoise 201212011 ,-.- , , 389-1 389-2,. .2 .-,.389-1:1998.1. - ( 389-1:1998, Acoustics Reference zero for the calibration of audiometric equipment Part 1:Referenceequivalentthresholdsoundpressureleve
4、lsforpuretonesandsupra-auralearphones)389-2:1994 .2.( 389-2:1994, Acoustics Reference zero for the calibration of audiometric equipment Part 2:Referenceequivalentthresholdsoundpressurelevelsforpuretonesandinsertearphones) 60318-1:2009 . . 1. (IEC 60318-1:2009,Electroacoustics Simulators of human hea
5、d and ear Part 1: Ear simulator for the measurement ofsupra-auralandcircumauralearphones) 60318-3:1998 . . 3. , (IEC 60318-3:1998,Electroacoustics Simulators of human head and ear Part 3: Acoustic coupler for the calibration ofsupra-auralearphonesusedinaudiometry)1 389-42011 60318-4:2010 . . 4. - ,
6、(IEC 60318-4:2010, Electroacoustics Simulators of human head and ear Part 4:Occluded-ear simulator for the measurement of earphones coupled to the ear by means of ear inserts) 60318-5:2006 . . 5. 2 3 , - (IEC 60318-5:2006, Electroacoustics Simulators ofhuman head and ear Part 5: 2 cm3coupler for the
7、 measurement of hearing aids and earphones coupled to theear by means of ear inserts)3 389-1, 389-2, - :3.1 (bone conduction): .3.2 (masking): , - () .3.3 ( ) effective masking level (of noise band),: , , - .1)3.4 (narrow-band noise): , .3.5 (pure-tone audiometer): , . () () / .3.6 (noise bandwidth)
8、: - , , .3.7 (critical bandwidth for masking): , - .3.8 (reference level for narrow-bandmasking noise): , - , , - 0 . , 60318-3, 60318-4, 60318-1 60318-5 -.3.9 (occlusion effect): , , , - , . - .1) .2 389-420114 1. , - , - 389-1 389-2, , , 60318-3, 60318-4,60318-1 60318-5 . , (1/3- 1/2- ), 1/3- 1/2-
9、, . , 1/3 1/2 , . 1 f, 1/3- , 1/2- , 125160200250315400500630750800100012501500160020002500300031504000500060006300800044444445556666666655555444445667778888877777663 389-42011 () , , , /, 4 . , - , , . , . :a) , - 4 ;b) , c68L, , c68 L =4+10lgb (f)/c(f), b(f) f,;c(f) f,. , 1 , - .1 .1 f, c(f)1),125
10、 100160 100200 105250 105315 105400 110500 115630 125750 135800 1401000 1601250 1901500 2251600 2402000 3002500 3853000 4803150 5104000 6855000 9156000 11506300 12508000 17001) 5000 5 , 5000 50 .4 389-42011 () .1 389-1:1998 IDT 389-12011 - . . . 1. 389-2:1994 IDT 389-22011 - . . . 2. 60318-1:2009 *
11、60318-3:1998 * 60318-4:2010 * 60318-5:2006 * . . - . - :- IDT .5 389-420111 ISO 389-3:1994, Acoustics Reference zero for the calibration of audiometric equipment Part 3: Referenceequivalent threshold forte levels for pure tones and bone vibrators2 IEC 60645-1:2001, Electroacoustics Audiological equipment Part 1: Pure-tone audiometers3 SCHARF, B. Critical bands.
