1、 KSKSKSKSKSKSKSK KSKSKS KSKSK KSKS KSK KS KS C IEC 60027 3 3: KS C IEC 60027 3:2009 2009 2 9 http:/www.kats.go.krKS C IEC 60027 3:2009 : ( ) ( ) ( ) : (http:/www.standard.go.kr) : :2002 11 30 :2009 2 9 2009-0052 : : ( 02-509-7294) (http:/www.kats.go.kr). 10 5 , . KS C IEC 60027 3:2009 i ii .1 1 1 2
2、1 3 1 3.1 .1 3.2 2 3.3 .3 3.4 3 3.5 .3 4 4 4.1 (neper and bel) .4 4.2 (octave and decade) 4 4.3 , (Shannon, hartley and natural unit of information)5 4.4 (multiples of units) 5 5 5 6 .6 6.1 A 6 6.2 G7 6.3 8 6.4 L .8 6.5 Lr.8 6.6 9 7 9 KS C IEC 60027 3:2009 ii . , , . , , . KS C IEC 60027 3:2009 3: L
3、etter symbols to be used in electrical technology Part 3: Logarithmic quantities and units (KS) (IS) 1989 2 IEC 60027 3, Letter symbols to be used in electrical technology Part 3: Logarithmic and related quantities and units , . 1 . KS C IEC 60027 2 . 2 . . ( ) . KS A ISO 31 0: 2001, 0: KS A ISO 31
4、7: 2001, 7: KS A ISO 31 11: 2001, 11: KS C IEC 60027 2, 2: ISO 31 2: 1992, Quantities and units Part 2: Periodic and related phenomena ISO/IEC 2382 16: 1996, Information technology Vocabulary Part 16: Information theory 3 3.1 ( , , ) . . . (derivative) (6.3 ). KS C IEC 60027 3:2009 2 , , . , . , , ,
5、 , . , , . . . , . . , , , , . “ ” LE “ ” Ains . . “ ” . . “log” (KS A ISO 31 11 ). (KS A ISO 31 11 ) . log2x lb x log10x lg x logex ln x 3.2 , . 3.2.1 : ( ) , . : ( / ) , , , , . , . : ( ) , . KS C IEC 60027 3:2009 3 : ( / ) , . ( .) . . : ( / ) , , . , , . 3.2.2 , . : (ds )/ds, ds . 3.3 : , . , 1
6、mW . : ( / ) : , “ ” . : ( / ) . : ( / ) . 3.4 , : ( / ) 3.5 (IEV 702 04 20 ISO/IEC 2382 16 16.03.011) 1) KS C IEC 60050 702: 2002, 702: , ISO/IEC 2382 16: 1996, Information technology Vocabulary Part 16: Information theory KS C IEC 60027 3:2009 4 H0 logan n : : loga( ) . . 1 . 4 . . . 4.1 (neper an
7、d bel) 4.1.1 . , . 4.1.2 (B) 10 10 . 4.1.3 (Np) e2 e . 4.1.4 . 1 neper 2 lg e bel 0.868 6 bel 1 bel 0.5 In 10 nepers 1.151 neper , , , . 1 1/10 10/1 . 1 1/e 1/e2 . 4.1.5 SI , . ( ) . 4.2 (octave and decade) . KS C IEC 60027 3:2009 5 2 . 10 . 1 octave-lg 2 decades 0.301 0 decade 1 decade-lb 10 octave
8、s 3.322 octaves 4.3 , (Shannon, Hartley and natural unit of information) H0 . (ISO/IEC 2382 1616.03.01) . Sh 10 . . NAT 3 H0 lb3 Shannon log23 Shannon 1.585 Shannon 1.585 Sh H0 lg3 hartley log10 3 hartley 0.477 hartley H0 ln3 natural unit loge 3 natural unit 1.098 natural unit 1 hartley lb 10 Shanno
9、n 3.322 Sh 1 natural unit of information lb e Shannon 1.443 Sh 4.4 (multiples of units) . 1 decibel 0.1 bel, 1 dB 0.1 B . 1 millineper 0.001 neper, 1 mNp 0.001 Np 5 . A A A . , A AA A A/A , 4. . , A . . KS C IEC 60027 3:2009 6 A In rfNp A A In rf . ANpIn rf . A A , AB 10 . =10 lgrf lg 2l0 lg 0.5rf l
10、g10lgrf lg1BAAAAB2 lg rf = lg e ln rf 20.434 3 ln rf 0.868 6 ln rf . (4. ). 6 , 2 2 . (F) (P) F , P . P . F , U, I, E, p , P S, . 6.1 2 . 6.1 ( ) . 6.2 6.5 6.1 . 6.1 6.2 1 1 2 2 1 . 6.1 A : A(P) : A(F) 1 2 . dB lg10B lg Np ln21212121)(=PPPPPPAPNP lnB lg 22121)(FFFFAF= 1 1 . U I , 2 KS C IEC 60027 3:
11、2009 7 . S P . : AU : AI : AS : AP . NP lndB lg20B lg 2212121UUUUUUAU= NP lnB lg 22121IIIIAI= NP ln50dB lg10lg212121SS.SSSSAS= NPln50B lg2121PP.PPAP= 2211IUIU= , 1 2 , . A A(P) A(F) AU AI AS AP 111222111, SIUZIUZIU= 222SIU = . ()IUSAA.A50 += NP ln 5.0B lg2122ZZZZAAUS= NP ln 5.0B lg2121ZZZZAAIS= NP l
12、nB lg 22121ZZZZAAIU= 6.2 G : G(P) : G(F)1 1 2 , 2 1 . KS C IEC 60027 3:2009 8 NP ln 5.0dB lg 10B lg121212)(PPPPPPGP= NP lnB lg 21212FFFFG(F)= G G(P)=G(F) 6.3 S , dS , dA dA/dS . A . . , . : Np/m B/m 6.4 L : L(P) : L(F)Pref Fref . NP 50dB lg 10B lgrefrefref)(PP.PPPPLP= NP lnB lg 2refref)(PPPPLF= L L(
13、P) L(F) LE E , Eref “ ” . dB lg 20B lg 2refref=EEEELEE 1 pV/m, Eref 1 nV/m dB 60B 6B )3(2B10lg 2BnV/m 1pV/m 1lg 23=EL 6.5 Lr . B lg 2B ln 5.0NP ln000FFPPFFLr= KS C IEC 60027 3:2009 9 F0 P0 . . 6.1, 6.2 6.4 . 6.6 x . decadelgoctavelb1212=ffffx f1: f2: 7 xref x . Lx(re xref) ref/ xxL 20 Pa 15 dB . LP(
14、re 20 Pa) 15 dB LP/20Pa 15 dB 1 A 10 NP . LI(re 1 A) 10 NP 1 mW 7 dB . LP(re 1 mW) 7 dB 1 V/m 50 dB . LE(re1 V/m) 50 dB . . 15 dB(20 Pa) 10 NP(1 A) 7 dB(1 mW) 50 dB(1 V/m) “1” . . . 3: 135513 7017 (02)60094114 (02)600948878 http:/ Korean Agency for Technology and Standards http:/www.kats.go.kr KS C IEC 60027 3:2009 KSKSKS SKSKS KSKS SKS KS SKS KSKS SKSKS KSKSKS Letter symbols to be used in electrical technologyPart 3:Logarithmic quantities and units ICS 01.060; 01.075