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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a characteristic diagram of the well-known bidirectional microphone by the polar pattern, FIG. 2 is a schematic plan view of a unidirectional
microphone device showing one embodiment of the present invention, FIGS. 3 and 4 are
schematic plan views when the principle of the present invention is applied as a one-point
microphone for four channels and a microphone for pinaural sound collection, respectively. 1,
3.8 ... support member, 2, 4, 5, e, 7, 13, 14 ... bi-directional microphone. Figure 1 Figure 2 Figure
4 Figure 3-49-
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a microphone
system having a single directional characteristic in which a wing directional microphone and a
diffractive object of sound waves are combined. As is well known, in the ordinary state, the
phylogenetic microphone has one 80 $ characteristic (opola pattern) as shown in FIG. This is the
characteristic in the case of placing the i-type iphone having bi-directionality in a free space in
retrospection, and in the case where there is an object that self-proclaims a sound wave in the
vicinity of the microphone, this C1411 Until the end of the day 4-. The present invention is
extremely directional using such a tk1L directional microphone field phone (1)! I would like to
obtain an Ikehon device. In the well-known cardioid microphone, the book has a heart-shaped
characteristic and is good, but in this case, the two mountain portions forming the heart-shaped
form become obstructive. The present invention is superior to such a cardioid microphone. Has a
unidirectional character! We propose an microphone device. FIG. 2 is a schematic plan view of
the six inventions, in which the bidirectional microphone 2 is SO-tested with 10% spacing on the
surface of a wooden cylinder 10 having a diameter of 17--about 90 in the 90 v direction. It
became clear that an attenuation of about 10 to 16 CIB was obtained. In addition, in the range of
90 degrees direction to 18 of direction, the attenuation characteristics equal to or less than the
above case 4 are exhibited. That is, it shows the characteristic that the latter half of the student
registration of 8 in FIG. 1 is lost. However, in the above embodiment, when a wooden cylinder is
used as the diffractive object and a single sphere is used, a result similar to 4 (8) can be
obtained), the seat change is reduced by about 6 dB / act I 11 degrees in the low l l l l l region It
became clear. Therefore, as the above-mentioned diffractive object, about 20 Ktld of glass wool
which is a sound absorbing material is incorporated into a cylinder of 17 countries in diameter,
and the same experiment as described above is performed using this. Good results were obtained
without any loss of properties. Thus, in the present invention, a very good unidirectional acoustic
transducer can be constructed by using a bi-directional acoustic transducer on the surface of a
spherical or cylindrical support member. . FIG. 5 shows an application example of a unidirectional microphone according to the present invention, which is a one-point microphone
device for 4-channel sound collection. That is, as described above, if bi-directional microphones
4, 5.6 and 7 are arranged at equal intervals in the upper part of the surface of diffractive object
60 using a wooden or sound absorbing material as shown in FIG. In the conventional case,
microphone tubes are simply juxtaposed every 901, and when the sound source is placed in one
normal image of the microphone φ 9, the two microphones that are adjacent to each other (3)
cause cross talk of -6 an However, as mentioned above, the directivity is excellent and crosstalk
hardly occurs!
An microphone device can be obtained. That is, the back half of the 80 character characteristic is
lost in each of the microphones 4 to 7 described above. Ideal characteristics are obtained. FIG. 4
shows another application example of the unidirectional microphone according to the present
invention, in which nondirectional microphones 9 and 10 are respectively disposed at positions
of 9Of each of the left and right sides of the surface of the dummy head 811! It is made to be
attached to the front side (front side) of the pick-up object 11.12 of Ichloho / 9.101i earlobe. In
addition, 13.14 is a bi-directional microphone a / mounted at a predetermined distance behind
(τ, a predetermined distance) of the dummy dot 8. Therefore, it is possible to measure the
flexibility with the pinaural i sound using a dummy head-as described above, the above bidirectionality y (chlophone is fixed to the surface of a copper or other copper diffraction object
such as wood). Since the sensitivity in the low range is lowered in the case of (4), it is possible to
make a flat characteristic over almost the entire frequency band by electrical correction or in
combination with other microphones. . As described above, the present invention mounts a bidirectional acoustic transducer on the surface of a spherical or cylindrical support member,
thereby making it possible to obtain a microphone device with excellent uni-directional O
characteristics. It can be obtained with a simple configuration, has a wide range of application,
and is of great practical value.
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