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The present invention relates to a stereo microphone device used in a tape recorder. 2.
Description of the Related Art In general, a stereo microphone device aims at recording with a
sense of presence by picking up different sounds from two microphones. Conventional stereo
microphone devices can be classified into two types: directional and omnidirectional
microphones. FIG. 3 shows a stereo microphone device when a directional microphone is used.
FIG. 3 & shows the structure, and the directional microphones 1 and 2 are placed on the same
plane plate 3 at a fixed angle. FIG. 3 shows the characteristics, and stereo characteristics are
obtained by installing two directional microphones at an angle. Further, FIG. 4 a shows the
configuration of a stereo microphone device when two nondirectional microphones are used. The
stereo characteristics as shown in FIG. 4 are obtained by arranging two nondirectional micros, 7
on the same plane plate 8 with a constant distance in the same direction. However, when two
directional microphones as shown in FIG. 3 are used, it is necessary to make the directional
microphone an angle, so the microphone structure becomes three-dimensional, and When using
two omnidirectional microphones as shown in the figure, if the distance between the
omnidirectional microphones is too narrow, the separation of the left and right sounds will be
worse, and if it is too wide, it will be difficult for the center sound to enter the microphone Had
the problem of Therefore, in view of the above problems, the present invention uses an
omnidirectional microphone that is easy to attach and has a planar structure, and has a sufficient
stereo feeling even when the distance between the two omnidirectional microphones is narrow.
The present invention provides a stereo microphone device that can obtain Means for Solving the
Problems In order to solve the above problems, the stereo microphone device of the present
invention is provided with 7-dots in adjacent portions of the grilles of two microphones arranged
on the same plane. By covering it, the separation of the left and right channels is improved so
that a sense of stereo can be obtained. The present invention obtains stereo feeling by the above-
described configuration. That is, by covering the inside of the grille with the hood, the sound
from the left sound source entering the right microphone is less and the sound from the right
sound source is greater, and the sound from the right sound source entering the left microphone
as well There will be less sound from the right source. In this way, by providing a hood as a
sound insulator inside two microphones next to each other and making it difficult for sound from
one side of the left or right to enter, it is composed of nondirectional microphones arranged on
the same plane Even with such a stereo microphone device, sufficient stereo feeling can be
Embodiments of the present invention will be described below with reference to the drawings. 1
and 2 show stereo microphone devices arranged on the same plane in an embodiment of the
present invention. In FIG. 1, grills 17 and 17 having sound holes are formed in an arc shape at
adjacent portions of the cabinet 11. And the adjacent part of this grill 17.17 is noise-insulated by
the microphone hood 12.12. The nondirectional microphones 13-2L, 13-b are disposed behind
the grille 1a with the hood 12 and each of the nondirectional microphones 13- &, 13-b is
attached by a mounting rubber 18.18. It is attached to the inner surface of the cabinet 11. Each
of the grills 17.17 is bonded to the inner surface of the cabinet 11 by an adhesive 19. In such a
stereo microphone device, the output from the sound source 14 first enters the right microphone
13-b as 16. At this time, since the output from the sound source 14 advances to the microphone
13-a on the left side like 16, no sound is input because the sound is blocked by the hood 12. The
same applies to the case where the sound source 14 is on the left side. The left and right
microphones 13-and 13-b are sealed by the mata and the attachment rubber 18 to reduce the
sound leakage on the left and right. That is, in the present embodiment, directivity of the input of
the microphone can be given by the cover of the hood 12 or directivity can be given to the nondirectional microphone on the same plane, thereby obtaining a stereo feeling. be able to. Effects
of the Invention As described above, according to the present invention, since a sense of stereo
can be obtained even with a nondirectional microphone on the same plane, price is lower than
that of a conventional directional microphone, and the directivity of the two microphones is The
stereo microphone device can be easily configured because there is no need to match it. 8 In
addition, since it can be used on the same plane in comparison with the stereo microphone
device with the conventional directional microphone, the use range of the entire microphone is
expanded In particular, it has the advantage of being able to realize miniaturization and thinning.
Brief description of the drawings
FIG. 1 is a sectional view showing an embodiment of a stereo microphone device according to the
present invention, FIG. 2 is an external perspective view of a tape recorder using the device, and
FIGS. 3 and 4 show a conventional stereo microphone device. And a are structural schematic
diagrams, and b is a directional characteristic diagram.
マイク、17・・・・・・グリル。 Name of Agent Attorney Nakao Toshio and 1 other person jl---
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