ダイナミックスピーカーの諸特性 - ne.jp

1 Science of Audio Physics of Speakers III Dynamic Speaker shiga @takatsuki - III-1 - III I II T/S III-1 III-1 (a) (b) III-1(a) II II-7 F v dxP FFdt v (III-1) (II-39 22Re( ) Re( )rrPFZR vvv(III-2))

2 Rr (II-46 2W V IRI Fm (I-40) 221mmmmmFFZrMC v(III-3) (III-2) 2221mrmmFPRrMC (III-4) M 10g kg f0=80 Hz (III-4) 0 Science of Audio Physics of Speakers III Dynamic Speaker shiga @takatsuki - III-2 - 0012mfMC (III-5) 22014mCf M Cm 4 10-4 m/N rm Q Q = Q = Q = (I-41) mmrM C Q v III-2 (III-3) Q III-2 (III-3) I L-C-R III-3 30cm 20cm 10cm III-3 II a ka 3 (i))

3 (ii) 2 (III-4) Q III-4 Q 2a=20 cm (III-4) III-4 20cm III-2 Q Q = Q Q = III-5 Q = III-5 Q = III-4 III-5 Q Science of Audio Physics of Speakers III Dynamic Speaker shiga @takatsuki - III-3 - Q (I-41) m mmrM C (1)

4 < 0 (III-3 1/ C 22 2 2mmFC v Rr 31()2 16xxJx (III-6) (II-46) 4221(2 )12rJkaaRa ckac (III-7) (III-4 42422maCPFc (III-8) 4 f0 Cm kg/m3 at 25 C c (346 m/s at 25 C) (2) f0 < < ka = 1 M 222 2mmFM v (III-6) 4222aPFcM (III-9) (3) >2ka 2211Pf (III-10) 2 f0 (III-8) (III-9) (2a)))

5 100 Hz W 24cm 1mm 12cm 4mm II x0 = y0 = 0, z0 = 1 0202ikzapietz v(III-11) F mZ p 222200221mmmFa FapzZzrMC (III-12) III-6 ka > 2 III-6 Science of Audio Physics of Speakers III Dynamic Speaker shiga @takatsuki - III-4 - 502 10 Pa 0 dBp 20logpp (III-13)

6 Sound Pressure Level W 0 (III-12 22aFpM (III-14) l I B F =B l I (III-14) 22a BlpIM (III-15) 20logpp (III-15 ) W Re W 8 VV ( ) a 2 B l M 1 L-C-R Q = (I-18) 0()tLCVI tteL (III-16) 0()mtMCFtteM v (III-16 ))

7 F0 0Bl I M ( )sinmx txt ( )cosmtdx dtxt v 2mx v (III-12) 222222maapx v(III-17) (III-15 ) dB xm III-1 20,25,30,38 cm dB 80dB 100dB 30Hz (100dB) 38cm(15 ) 80dB [Hz] cm 20 25 30 38 [mm] 30 60 100 100dB [Hz] [cm] 20 25 30 38 [mm]

8 30 60 100 III-1 1m 80dB 100dB V Science of Audio Physics of Speakers III Dynamic Speaker shiga @takatsuki - III-5 - I eZV I III-7 R III-7 'VBl v v (III-3) mFBl I 2'1 ( )mV VVBl IIRRR Z (III-18 2222( )( )(1)emmmBlBlZRRZrMC (III-19))

9 F0 Q Qsm rm Q Qst LC f0 JIS R (III-4 (III-12 F F Bl I (III-4 (III-12) Blv R 'IBl R v 2()''eBlFI BlrR vv (III-20) merr R I0 00 VFBl IB lR (III-21))))

10 Q T/S Q Qms Q Qes Q Qts Qms Q Qms III-8 DF DF Ra Re DFeaRR DF DF 100 DF Science of Audio Physics of Speakers III Dynamic Speaker shiga @takatsuki - III-6 - 1 Q III-8 DF DF DF T/S Thiele Small T/S T/S fs f0 Hz M kg a m Re Qts Qms Qes Xmax THD 10%