H21-30
H21-31
H21-32
H21-33
H21-34
H21-35
H21-36
H21-37
H21-38
H21-39
H21-40
H21-41
H21-42 n n S L N S L N L N S S S L L log I II I L I L log I I
H21-43 L log L log I I I log log I I I log log I I I I I I I I I I
H21-44 T I p tc L T log T # t 1 t 2 p t dt p log T # t 1 t 2 I t dt I I p tc Tp p I
H21-45 I
H21-46 L
H21-47
H21-48
H21-49 T T
H21-50 db 140 130 120 0 100 90 80 70 60 50 40 30 20 10 0 10 20 31.5 63 125 250 500 1 k 2 k 4 k 8 k 16 k 20 k Hz F T N N
H21-51 c = 331.5T T p I = I p tc tc
H21-52 1 L p = 10 logp 2 /p 02 20 log20 log10 2 40 db 2 L p = 10 logi /I 0 L p = 10 log p I p 2 /p 02 I = L tc p = 10 log = 10 log p I p 3 I = tc = = = 10 8 L N p
H21-53 T c T c
H21-54 sin i 1 c 1 sin i 2 c 2
H21-55
H21-56
H21-57
H21-58
H21-59 db s
H21-60 db db/oct db/oct rmsm/s db Hz
H21-61
H21-62
H21-63
H21-64
H21-65 dy y= y 0 sint v = = y dt 0 cost dv dy 2 a= = =v dt d 2 t 0 sint =y 0 2 sint y 0 v =y 0 a = v = y 0 2 = 2rf a 1/ L = 20 log a 0 10 5 20 Hz 8 db 20 Hz 16 Hz 6 db31.5 Hz 12 db 1y 0 y 0 910 4 /2rf 910 4 /125.77.210 6 2 v910 4 2rf 910 4 125.7 a
H21-66 10 2 0. 3 a/ 0./1.414 0.08 420 log0.08/10 5 = 20 log810 3 186078 75 578870
H21-67 f km d f 0.5 0.5 0.5 f 0 5 d 0.01 0.1 km km f
H21-68 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 0.2 0.4 0.6 0.8 1.0 1.2 1.4 / v v 1.2 1.0 0.8 0.6 0.4 0.2 0.2 0.4 0.6 0
H21-69
H21-70
H21-71 db 120 0 100 90 80 70 60 50 Hz 550 Hz 10 20 30 40 50