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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1a is a block diagram of a conventional pair
microphone type stereo microphone, FIG. 1 is its polar pattern diagram, FIG. 2a is a block
diagram of an MS type stereo microphone, FIG. C is its polar pattern diagram, and FIG. 3 a is a
schematic diagram of the secondary gradient narrow directivity. C shows its polar pattern, FIGS.
4A to 4C show an embodiment of the present invention, and FIG. 4A shows a configuration of a
variable directional axis narrow directivity microphone, and FIG. 4C shows its polar. It is a
pattern figure. S code description, lla, llb ...... unidirectional microphone unit, 12a, 12b ......
bidirectional microphone units, 13.14 ...... microphone unit sets, 15 ииииии Microphone case.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a directional
microphone, and the history (? 1 ((-stated is a combination of a plurality of microphones, S! 66 /
.rho.i, r-7 nJ variable directional microphones. . ? +): The next one-point stereo mike microphone
II as shown in FIG. To 1) '4'-Directional microphones / units 1a, 1b 9 + 10 = 150 ░ Directional
production 1 Open between microphone case 2 V FL FL ir c ? ? Schunitt output ? 1 II IILch,
Rch output As Lch, Rch level difference 7 o'clock IHI difference is taken out, as shown from vC to
11A (/ ') a pair microphone system that sleao feeling IIJ and Fig. 2 (as shown to al-Oki directional
microphone unit l and h] h homosexual microphone [1 phone-1 nitte 3? -Tt-thin direction mains
+ a or 90 ░ 1 (concurrently placed at the same time C dust and placed in the microphone case 2,
4 (1-, the output of the unidirectional micro hono uninot 1 and L-? 1 size ? = IMJ-tl z 7-7L ? S,
90 0-2 2 l 1 foot-R = 8 to S = IM -Ass: n ? where Im: sensitivity of the Oki 4tiN type microbon
unit (eight и ? ? sensitivity ls: sensitivity of the 11 m m-interval 11 microphone units (S) 2r, 32.
1 ?: ? -directive butter Sr Sr-le 9: bi-directional pattern ?: angle of sound ? ? ? ? to
microphone main axis + n, individual directional hatern of unidirectional microphone M and
bidirectional t 1 microphone unit S As shown in FIG. 2 (b), the outputs of Lch and Rch are taken
out as shown in FIG. 2 (C), and there is a thing to obtain stereo feeling by the output 1JNl / bell
difference of L and R. Directional main axis angle ?. Is expressed as s06 = 2 art-fay 21 s, and
changing the sensitivity of the unidirectional microphone unit and the 7.1 bi-directional
microphone unit There is an ivls (MID-8 IDE) method. Further, as shown in FIG. 3 (a), two singledirectional + [microphone units la and 1b are made to be both principal axes with all Ji ? ? i
main spindles and both unit spacing l) appropriately opened and microphones If the Q is placed
in the case 3 as shown in the directivity pattern i-1i '83 in FIG. Ib) of the microphone units 11'
1's, the output curve a: ttS-n is shown in FIG. 3 (1) as this combination. As shown, in the case of a
Qj-directed microphone unit, a bimodal sided narrow-directed microphone capable of obtaining a
narrow directivity characteristic as compared to 1c is put to practical use.
However, in the former bare microphone and AI out MID-8 II) E method, although the stereo
feeling is 1 or less, the joint finger same character having a narrow directional axis angle or the
float is small, and the latter is narrow. Orientation-t! r + 1 is the power to be 5) and the sense is
1! There was a drawback that it could not be done. This groove line is a narrow-pointed
stereomicro, 1-, 1-y-folded one with the defects of the upper-yu No. 1 series, and two J41homologous places where it is specifically characterized as a failure Micro hono uninoto and two
bi-directional 4 'microphone units that fno! "The beat of the ts% God microphone unit and these
finger rotations" are changed by 90 ░ "and the inside of the microphone case (the li '(I've done it
ah. In the following, this idea is shown in the figure. Learn more about l. The fourth victim
receives the mouth J of this neck, (t of the homology microphone>, by ((2114 one toe directional
microphone 91 units 1itr, tlb, two bidirectional microphones)) (12 'and -12 m are different from
each other by 90 degrees of the principal axis of the unidirectional microphone unit 11a and the
principal axis of the bidirectional microphone unit 12'll (( Microphone units 11b and bidirectional 1'1 microphone units 12b, each consisting of a set of microphone units 14 ', which
are separated from one another by their own microphone units (appropriate opening 1 in the
41k microphone case 15). (MID-SILK,? ;) Stereo microphone can be obtained. и Here, assuming
that the outputs iM and 1M of the yearly directional microphones 1111 and 11b and the outputs
of the bidirectional microphones 12a and 12b are Sl and S2, the microphone output is a right
channel output ? L signal lL2% left channel Itf force ?1 (,. Assuming that R2, L ? = 8 ? ? to l
+ S ?, R ? = M ? ? 8 I, 2- to 12 s. R2-M2-S2 is obtained, and the difference between these
outputs is taken out to obtain Lch + Rch output 1? + j. 1); 3 L = l, ?12? (IN??F ? ? 15sra
?) ? "X +-''" "idid avoidance D +-to? 2 = 0 y 4. . , 0) It '-$ Dos 9) / (jyS?2 size i ? ? D (b, +-m
"microphone unit each fine, resistance. Constant immunity determined by the microphone phase
interval etc .: Wavenumber A: The sensitivity ratio of L and L2 and Ro and R2 is obtained, and
this (read from ? and A (11 V (from K from 4 in Fig. 1 h) ( In addition, the homology patterns of
hhL1 and R2 are synthesized with the finger U-pattern of L2 1 1 2 2 and the results are shown in
Fig. 4C1. You can get one in a single issue.
More than 1] I like this chrysanthemum! ?) (и, two single directional 41 micro hono uninoto and
two bi-homologous micro bon ni ni oto rivers, i, 'x L one single WN tropic micro; J-7 units and
one L') The two finger micro-bottles 9a are arranged so that the pointing principal axes are 90 ░
to each other, and each pair consists of two sets, and each pointing principal axis of the
unidirectional microphone units is coaxial. Set the interval between sets appropriately and store
them in the same microphone case, take the sum and difference of the outputs of the different
type of microphone units of each set, and divide the left and right channel outputs into 4 and
rect. Microphone output 'kr! By second order gradient type depending on Therefore, the effect of
realizing an excellent variable directional axis narrow directional stereo microphone is realized.
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