TSP信号を用いた音響系評価の研究

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1 1 TSP 98kc068

2 TSP TSP ATSP OATSP 2.3 N N TSP m

3

4 4 1 1) 2) 15 20s50100V 3) (4) TSP

5 5 2TSP (1) 2.1 Inpulse Response SN Time Stretched Pulse TSP

6 6 2.2TSP 2.2.1ATSP ATSP ATSP H( n) = a H( N / 2) 0 H( n) = H exp( jkn * ( N n) = a 0 2 ) 0 n N / 2 1 N / n < N 1 n H(n)TSP * H(n) n = N / 2 n = N / n = N / 2 1 H(n) N n n = 0 n = N n = 1 i n = N 1 n = 2 i k TSP TSP H(n)IDFT TSPx(t) ATSP ATSP n a0 H(n) H -1 IDFT H H H ( n) = a ( N / 2) 0 ( n) = H exp( jkn * ( N n) = a 0 2 ) 0 n N / 2 1 N / n < N 2 4 N = 4096 k = ATSP(a) (b) a b 2-2-1(2) ATSP

7 OATSP TSP f 0 fs/2 (1) k H(N/2) (= ) fs/ H(N/2) k m 2 k N/2) = mπ ( 3 (3) k k 2 = mπ /(N/2) 4 (4) (2) ATSP H( n) = a exp( j4m * H( n) = H ( N n) n 2 0 π / N 2 ) 0 n N / 2 N / n < N 5 OptimizedATSP(OATSP) IDFT OATSP TSP OATSP =N/2 fs/2 N/2 OATSP H(n) H -1 (n)idft OATSP H -1 (n) H H 1 1 ( n) = a 0 ( n) = 1/ a exp( j4mπn 0 2 * * H ( N n) / N 2 ) N 0 n N / 2 / n < N 6

8 OATSP N=4096m= (5) (6) OATSP MATLAB

9 9

10 10 N N (5) ATSP (6) N DFT TSP TSP TSP 2 2 L TSP L+1 TSP N DFT TSP IDFT [kHz]N = 2 TSP

11 TSP N TSP N TSP N TSP N TSP TSP (5) (6) N (2) (3) ATSP 8 TSP N TSP N TSP ATSP OATSP (5) (6) OATSP ATSP OATSP OATSP 0 N (2) ATSP

12 (5) (6) OATSP TSP OATSP OATSP TSP 2-3-1

13

14 14

15 TSP TSP TSP 100 TSP 110 TSP TSP TSP

16 N=4096 m 2N 1 2 E = ( ) δ ( i) δ( i)) /(2N 1) 7 i= 0 ) δ (i) TSP (i) rot n rot = N 2 m / N N=

17 17

18 N=4096 (8) OATSP TSP TSP TSP (7) N/2 fs/2 TSP TSP N= [dB] m N (8) N=

19 19

20 20 3 (2)(3) A. B.

21 A. B. C.

22

23 a db

24 ω [rad/s] 0 V & [m/s] F & [N] F & V & F& Z & r = Rr + jx r [Ns/m] V& R V& r X V & 90 r Z & m0 [Ns/m] F & Z & Z & m0 r R r

25 P a P a 2 2 F& = Rr V& = Rr [W] Z& + Z& m0 r R X λ d d r r f X f Sz r S z 0 & 0 + Z & jωm R << ω m r Z m r X r R r Rr 0 P a R r F& jωm 2 [W] 3-3-3

26 f = ω R f 2 4π r F & R P a 2 Z & + Z & 4 j 1 ωc m r ( ) m P a ω 3-3-4

27 Hz 4 F & f 0 f 0 f 0

28 A B C D B 2 3 f 0

29 (f0) f f0

30

31 TSP TSP 48[kHz]N=24576A=10mN/4 TSP TSP

32 32

33 33

34 34

35 35 BOSE 101MM BOSE 101MM 11.5[cm] 70~17k[Hz] 6[] 45[W](rms IEC268-5) 150[W](peak) 86[dB] SPL1[W]1[m] 130 2P 232(W)245(H)152(D)[cm] 2.1[kg] BOSE 101MM 4-1-3

36

37

38 TSP [cm] 1[m] [m]

39

40

41

42 [Hz] 200[Hz] 23[dB] 1[kHz] 1[kHz]

43

44

45

46

47

48

49 [m]

50

51 TSP

52 [] TSP TSP FFT

53

54

55

56

57

58 BOSE 101MM [kHz] 1[kHz]

59 [kHz]

60 TSP * TSP *1

61

62

63

64

65 [Hz] 200[Hz] 2[dB] 1500[Hz] 1500[Hz]

66

67

68 [cm] TSP 10[cm]

69 69

70

71 [kHz] 2[kHz] 1.3[kHz] 2 [ ] [] 48[kHz] 10[ms] [ ] 5-4-7

72 [ ] [ ] [ ]140[ ]145[ ]

73 [ ] [ ]

74 [ ]

75 75 140[ ] [ ]

76 *2 TSP [m] *2 100[]

77 [kHz] 5-5-4

78 [g] [g]

79

80

81

82 [kHz] [kHz]

83 [kHz] 1.3[kHz] 1.3[kHz] 1.3[kHz]

84

85 TSP 1[m]

86

87 BOSE101MM BOSE 101MM

88 [kHz] 1.3[kHz] 1.3[kHz] 1.3[kHz] db

89 89 (1), EA92-86( ). (2) pp , (1989-8). (3) pp.38, (2001-4). (4) pp , (1995-3).

07.報文_及川ら-二校目.indd

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