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JPS4948129

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DESCRIPTION JPS4948129
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 illustrates in principle one embodiment of the
microphone according to the present invention, FIG. 2 is an equivalent circuit diagram of its
vibration system, and FIG. 3 eliminates the transformer of FIG. 4 is an equivalent circuit diagram
in which the equivalent circuit of FIG. 3 is organized, and FIG. 5 is an equivalent circuit diagram
in the case where the 6-terminal pair acoustic circuit of FIG. 4 is represented by one acoustic
impedance Zx. is there. FIGS. 6 and 7 are pole face directivity characteristics of the microphone
according to the present invention in the XY plane and the XZ plane, respectively. 111, 12, 13,
14. иииииии Diaphragm, 21 иии и и и и и и и и и и и и и и и и и back air chamber, 41 и и и и и и и и и communicating tube.
? ? ?: l $ / 1 ? (^)? 1 1/1 и 1 75 1 ? 49-48129 (2) 1 2 2 L ?-76-49 49-48 129 (3) ? 2-77? 49-4 slz 9 (4)? ,. ? ? ? ? ? ? H = 47 H: J; ???????? "7", ",", ""; {?} ": и и и. . F = "/ 1,
j. /, To 7, 2 j 2 i.'a". -"" "" F f; 'now. ?
?????? ? ', :: ,,' ? D more! ??? ? ?
????????????? '' '' '' A /:> / 1: 1 =. i. r \ ? ~ / J: ". 'li и и и и и и и и и и и и и и и и и и и и и и и и и и и и и
и и и H и и и \ ?? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?
?, ░ "/," ". ?:;: ? ?. , ',-, One \ n. ???????????????? 'One, /', ...,
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10-05-2019
1
????????? ?????????????? ????? "/" и и и и и и 7.s, ?-?1?-1-I 1-(i ',.
",' 7. \ 'и и и и и и и и и и и и и и и и и и и и. "?", L '. , Ha, one. . ?, ',;-. , и 7, и и и и и и и и и и и и: I one more. ????
???? ????? "J '\ 2.1". :,. : / ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?
? ? ?Nose machine ? ? ?? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?
? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?? ? ? ? ? ? ? ? ? ? ? ? ?
? ? ?, ? ? ? ?Air (0): Fig.1: Actual opening 49-48129 (7) Y'81, actual opening 49-48129
(8) YY ', Fig. 6-actual opening 4g--4s 129 (9) O z-,, ? 0 ░-83-
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a microphone
having six diaphragms capable of picking up six orthogonal sound signals in space by one
microphone. When sound signals in six directions orthogonal to one another in space are picked
up, it is conceivable in the prior art to use six ? -directivity 74 crophones and arrange them
radially to pick up sound. However, such means require a large number of microphones, which is
inconvenient for sound collection, and r (, localization of sound image is unclear because of phase
interference due to arrival time difference of sound waves to each microphone. The purpose of
the present invention is to construct a microphone that is suitably configured and arranged to
eliminate the above-mentioned drawbacks, and to use six microphones capable of producing six
orthogonal sound signals in space with one microphone. It is to offer. The present invention
acoustically couples six diaphragms of equal converted mechanical impedance to each other
through one common six-terminal pair acoustic circuit, and the directivity of each diaphragm
output is in space. Sounds C 'and S's of the diaphragms and the 6-terminal pair acoustic circuit
are appropriately determined so as to be single directivity or hypercardioid directivity in which
six directions orthogonal to one another are the main axis directions, and each vibration It is
characterized in that the plate outputs are individually, combined or combined and put out. The
present invention will be described in detail with reference to the following sections. FIG. 1
shows the structure of an example of the Ko-ten-2-Praise Sir Microphone according to the
present invention using six diaphragms. The back electrode, 3 and 32 are back air chambers, and
4 is a communicating pipe. Generally, an equivalent circuit of the vibration system of the
microphone as shown in FIG. 1 is shown as in FIG. Where Sl, S7, S3, S4, S6, S are the (2) products
of the diaphragm, Zl, n2, n3, Z4, 4, Z6 are the equivalent impedances of the diaphragm, Vo, 22,
33, 44 , V6, Shiro is the vibration velocity of the diaphragm, j, j. p3, P4, P3 and ?6 indicate the
sound pressure applied to the diaphragm, and a indicates the effective distance from the origin of
the six-terminal pair acoustic circuit (medium space surrounded by six diaphragms) A to each
acoustic terminal. In the equivalent circuit of FIG. 2, the mechanical circuit of the center acoustic
circuit A and the mechanical equivalent circuit of each acoustic terminal 2.2; 3.3; 4.4; 5.5; When
converted to a circuit, it becomes as shown in FIG. Therefore, ? 2 3 3 4 4 5 5 ?. If the condition
that s: s: s; S: S: S; ?and the straw conversion mechanical impedance are equal to each other is
satisfied, the circuit of FIG. It is represented as shown in Fig.4.
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??????░???????? ???? () 'T = v2P25I-F21)' 3-'vs'3, + = "s1 (2) S4 (s) (l'4-v,
P4" +-"415, (-) V5-p , S, -F51 S6 (-) V 6 -2. ???? ????????? And rewrite. -4- When a
sound wave is incident on the microphone from the far side in the (?, ? ? ?) direction, it is
added to each sound terminal 1.1; 2.2; 3.3; 4.4; 5.5; 6.6 The excitation forces F1, F2, F3, I'4, I
'and F6 are given by the following equations, considering the phase of the sound wave incident
on the origin as a reference. F, -F1a-7 ? ? ? ? 0 ? ? ииии jka sin ? sin ? 2-Foei 3: io en ka sin
? CO, f ? (3) fi 4 = i. 2 k k иии ? ? ? ? ?; '5-ho, no kaCo, q?; 6-17. E) ka ? ? ? ? where I
? o is the excitation force at the origin, and = = It is ca / C (C ': sound velocity, ?: acoustic signal
angular frequency). Assuming that the impedance matrix of the 6-port pair acoustic circuit is [Z],
Z,? ???????????????????????????? ???????????
???????????????????????????? ???????
?????????????? ????????? ?3 ? ? 64f6. When the vibration velocity
of each diaphragm 6-5- is [;] and the excitation force applied to each acoustic terminal is [F], the
straw is 02F2; 3F3 [L] -8 (-F> F, (5 ) F. The vibration velocity of each diaphragm can be found as
(t) = ([Z) + zo (1:])-. [;: + (6 ?). ????????????????????
????????????????????????????????????????? In
the case where the 6-6 terminal pair acoustic circuit is represented by a single impedance Z2 as
shown in FIG. ?, =, (((Zo + 42z) cos (ka sin ? co, 4) FO "o (" o + 6 Z z)-2 Z z cos (kas ln ? st n ?)
2 Z z cos (karo J)) + j (lo + 61 z) 5 ln (ka sin ? CO, + 9: 1) (0 It is determined. Now, considering
the contense microphone of the structure of FIG. 1 (h) as 1 ?, ?O Zonino ? m ? + ?.
It is given as 10-no .omega. (9) .rho.2Zz, = -no 0-7. However, "Os 0 0, ?. Is the equivalent mass of
the diaphragm including the mechanical impedance of the thin air layer, the equivalent stiffness
and equivalent resistance, and ? 2 is the equivalent stiffness of the back air. (! The value rho
which is 1 to the output pressure of the condenser microphone 1 when the resident of the
equation 71 is the equation (8). If "v + / y ? po is ka = x 2? 2-= ? 2 0 0 ? oc--= Ctl (7 Q) ? 2
ao C 2-(-)-? 2 2 2 a, then ? 0 ? 1 1 =-((4 +-? 2 x 2) CO, tCXS In ? cos ?) no ? Fo? 2 ? 2 2
cos (x sin ? 91 n ?) 2 cos (x cos ?, 15 in (x s ln O cos r ?)) 8-1 ? ((6 +-1 ? 2 ? ? 2) sin
(xsrin ? cos ?) 2 + ? l x cog (x sin ? cos ?)) x ((6 +) x и ( ?, '+ 6 ? 2 + 2', 1 ? 2 ? 2 ? 2 10
? 2 2.4) + j x (?, (6 + ?) ? 2 ? 1 ?, 2.) 1 ? 2 (77). From the equation (1), the condition for
the directivity to be single / directive can be found as 0'-6 (12) ?2 -3. At this time, the equation
(II) becomes 090911 ▒ ein O cos ? (13) ? ? FO nor o ? 2 This is a unidirectional pattern in
which the main axis is in the positive direction of the X axis. Similarly, in the case of losing the
output of the other diaphragm, it shows a unidirectional directivity of the main axis directed in
the Y axis, -X axis, X axis, -2 @ direction. The directivity patterns in the XY-V plane and the XZ
plane at this time are shown in FIG. 6 and FIG. In the figure, 5 ░, 52.53 ░ 54.55.56 indicates the
directivity pattern of each diaphragm output. Therefore, a unidirectional pattern in which six
orthogonal directions in space are the main axis directions is changed. Of course, if the value of
?, is adjusted, an и и и ? ? ? ? ? ? 1 directivity pattern can be obtained. It should be noted
that the sensitivity is uneven due to the difference of the i + product of each diaphragm j or the
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electromechanical conversion coefficient etc. (и The attenuator ifv connected to each diaphragm
output can be corrected by an amplifier. The microphone according to the present invention
described above is a microphone using six diaphragms, and it is possible to obtain unipolarity or
? -imparker geoid directional pattern in which the principal axis directions are directed to six
mutually orthogonal directions in space. Therefore, it is suitable for six-channel solid ft that also
expresses the vertical direction [one-point sound pickup for playback systems, and the distance
between each moving plate can be made smaller compared to the wavelength of the sound wave,
so phase interference does not occur. Therefore, a reproduced sound with a clear localization of
the -10-sound image is obtained.
Furthermore, the microphone according to the present invention can constitute a threedimensional sound field analysis device together with a suitable display device.
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