1、 8.7142010( 61260:1995) IEC 61260:1995Electroacoustics Octave-band and fractional-octave-band filters(MOD) 27 2002 . 184- , 1.02004 . 1 - - () , 42 206 3 30 2010 . 771-4 61260:1995 . (IEC 61260:1995 Electro-acoustics Octave-band and fractional-octave-band filters Amendment 1:200109) , -. - 1.52004 (
2、 3.5)5 , - . () . - , , 2012 , - - II 8.71420101 .12 13 24 55 96 127 138 14 A () 18 B () - .20 C () .21 D () .22 () - , - 2324III 8.7142010 - 61260:1995 , 1:2001 61260:1995:- 1.52004 - () - -. 60050(801):1994 . 266:1975,61672-1:2002,61000-4-2:1995,61000-4-3:1998,61000-6-1:1997,61000-6-2:2005, 61000-
3、6-3:2006, 16-1-1:2006, 22:1997 - 1209080, 53188.12008, 51317.4.299, 51317.4.399, 51317.6.199, 51317.6.22007, 51317.6.32009, 51318.16.1.12007, 51318.222006;- 1.5, ;- 1.52004 - ;- - ;- 3.12 ;- 3.12, 3.12;- ( 8.1.2) , , ;- 8.1.3 ;- 61260:1995 , ;- - 1.52004;- , , . .IV 8.7142010 Statesystemforensuringt
4、heuniformityofmeasurements.Octave-bandandfractional-octave-bandfilters.Technicalrequirementsandtestmethods 201207011 1.1 , , (),. (-). (), , ,.1.2 , 0, 1 2. .1.3 , , . .1.4 , , , , , , . ,.1.5 .2 : 51317.4.22010( 61000-4-2:2008) -. 51317.4.399 ( 61000-4-395) -. . 51317.6.199 ( 61000-6-197) -. , , .-
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6、1317.6.3, - : , , - 1 2.3.1 (bandpass filter): ( - ), -, , .3.2 ; G (octave ratio): 2:1.1 : - .2 G10=103/10c187 1,99526. (1)3 G2= 2. (2)4 .3.3 ; 1/b (bandwidth designator): , - , 1, . b = 1.3.4 ; fr(reference frequency), : , 1000 .3.5 ( ); fm(exact midband frequency), : -, , - .2 8.71420101 , fm=(Gx
7、/b)(fr). (3)2 , fm=(G(2x+1)/(2b)(fr), (4) , . .3 (3) (4) - , , - , .4 , 10:1, 10:1 . .5 , 5000 5011,872 - 5039,684 , 0,6 %. - 50000 50118,723 50796,834 , 1,4 %.6 , 1000 . , 1000 , 1000 .7 - .1 ( ).3.6 ( ) (nominal midband frequencies),: , .3.7 ; f1 f2(bandedge frequencies), : - , f1 f2, . - :f1=(G1/(2b)(fm); (5)f2=(G+1/(2b)(fm), (6) G , (1) (2)
