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JP2016184876

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Notice
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complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
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DESCRIPTION JP2016184876
Abstract: A stereo sound can be obtained by a plurality of sound collection methods. SOLUTION:
A nondirectional microphone unit 10, a bidirectional side channel microphone unit 20 disposed
orthogonal to the direction of a sound collection axis outside the nondirectional microphone unit
10, and a nondirectional microphone A right channel microphone unit 30 disposed at a
predetermined angle with respect to the side channel microphone unit 20 in a plane including a
sound collection axis on the outside of the unit 10, and a collection on the outside of the
nondirectional microphone unit 10. It has a left channel microphone unit 40 disposed at a
predetermined angle with respect to the side channel microphone unit 20 and the right channel
microphone unit 30 in a plane including the sound axis. [Selected figure] Figure 1
ステレオマイクロホン
[0001]
The present invention relates to stereo microphones.
[0002]
As a sound collection method of stereo sound from which a response characteristic with a good
directional frequency can be obtained, there is known a sound collection method in which a
plurality of microphone units are arranged close to each other, such as an XY method or an MS
method.
[0003]
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1
In the XY method, the right channel unidirectional microphone unit and the left channel
unidirectional microphone unit are disposed to the right and to the left, respectively.
In addition, in the MS method, a unidirectional microphone unit for the mid channel and a bidirectional microphone unit for the side channel are arranged with their directivity axes
orthogonal to each other.
[0004]
In addition, about the stereo microphone, the technique which made the angle of the directional
axes of the ribbon microphone unit with which right channel and left channel are alternately
arrange | positioned by 90 degrees for circumferential direction alternately is disclosed (for
example, patent document 1) reference).
[0005]
Patent No. 5574494
[0006]
Although the XY method and the MS method have their respective advantages, as described
above, since the types and arrangement of the microphone units required for each method are
different, it is necessary to obtain stereo sound by a plurality of sound collection methods with
one stereo microphone. was difficult.
[0007]
An object of the present invention is to provide a stereo microphone capable of obtaining stereo
sound by a plurality of sound collection methods.
[0008]
The present invention provides an omnidirectional microphone unit, a bidirectional side channel
microphone unit disposed orthogonal to the direction of the sound collection axis outside the
omnidirectional microphone unit, and an outer surface of the omnidirectional microphone unit.
Of the bi-directional right channel microphone unit arranged at a predetermined angle to the side
channel microphone unit in a plane including the sound collection axis in one direction, and the
sound collection axis outside the nondirectional microphone unit It is characterized by having a
side channel microphone unit and a bi-directional left channel microphone unit disposed at a
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2
predetermined angle with respect to the right channel microphone unit in a plane including.
[0009]
According to the present invention, stereo sound can be obtained by a plurality of sound
collection methods.
[0010]
FIG. 1 is a plan view showing an embodiment of a stereo microphone according to the present
invention.
They are the front view (a) which shows the external appearance of a ribbon microphone unit,
and a side view (b).
It is a side view of the stereo microphone of FIG.
It is a circuit diagram of the stereo microphone of FIG.
It is a top view which shows another embodiment of the stereo microphone based on this
invention.
[0011]
Stereo Microphone (1) Hereinafter, an embodiment of a stereo microphone according to the
present invention will be described with reference to the drawings.
[0012]
Arrangement of Stereo Microphone As shown in FIG. 1, the stereo microphone 100 according to
the present embodiment picks up sound around the direction of the sound collection axis S.
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The stereo microphone 100 has a nondirectional microphone unit 10.
The stereo microphone 100 has a side channel microphone unit 20, a right channel microphone
unit 30, and a left channel microphone unit 40 outside the nondirectional microphone unit 10.
[0013]
For the omnidirectional microphone unit 10, for example, a condenser microphone unit is used.
In addition, as the nondirectional microphone unit 10, microphone units other than the
condenser microphone unit can also be used.
[0014]
The side channel microphone unit 20, the right channel microphone unit 30, and the left channel
microphone unit 40 are bi-directional microphone units, respectively.
For example, a ribbon microphone unit is used for the side channel microphone unit 20, the right
channel microphone unit 30, and the left channel microphone unit 40.
[0015]
The side channel microphone unit 20 is disposed such that the directional axis D1 is orthogonal
to the sound collection axis S of the stereo microphone 100.
[0016]
The right channel microphone unit 30 is arranged to form a predetermined angle θ1 (for
example, 120 °) with the side channel microphone unit 20 in a plane including the sound
collection axis S.
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The directional axis D2 of the right channel microphone unit 30 is arranged to form a
predetermined angle α1 (for example, 60 °) with the directional axis D1 of the side channel
microphone unit 20 in a plane including the sound collection axis S.
[0017]
The left channel microphone unit 40 is arranged to form a predetermined angle θ2 (for
example, 120 °) with the right channel microphone unit 30 in a plane including the sound
collection axis S. The directional axis D3 of the left channel microphone unit 40 is disposed to
form a predetermined angle α2 (for example, 60 °) with the directional axis D2 of the right
channel microphone unit 30 in a plane including the sound collection axis S.
[0018]
Further, the left channel microphone unit 40 is disposed to form a predetermined angle θ3 (for
example, 120 °) with the side channel microphone unit 20 in a plane including the sound
collection axis S. The directional axis D3 of the left channel microphone unit 40 is arranged to
form a predetermined angle α3 (for example, 60 °) with the directional axis D1 of the side
channel microphone unit 20 in a plane including the sound collection axis S.
[0019]
The right channel microphone unit 30 and the left channel microphone unit 40 are disposed at
the same angle in the same plane with respect to the side channel microphone unit 20. That is,
the figure by the line connecting the intersections at which each two of the three directivity axes
D1, D2 and D3 intersect is an equilateral triangle, and the nondirectional microphone unit 10 is
disposed at the center (centroid).
[0020]
Note that θ1, θ2, and θ3 may not be equal angles as described above but may be different
angles.
[0021]
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FIG. 2 is a front view (a) and a side view (b) showing the appearance of the ribbon microphone
unit used as the side channel microphone unit 20. As shown in FIG.
[0022]
As shown in FIG. 2B, in the side channel microphone unit 20, rectangular ribbon-shaped
diaphragms 21 are arranged in parallel at an interval.
Further, in the side channel microphone unit 20, a protective plate 23 for protecting each of the
ribbon diaphragms 21 is disposed.
As shown in FIG. 2A, the protective plate 23 has a plurality of holes 24 formed therein. The holes
24 allow sound waves to pass. The sound waves passing through the holes 24 vibrate the ribbon
diaphragm 21.
[0023]
The oscillated ribbon diaphragm 21 crosses the magnetic flux of the permanent magnet (not
shown) disposed around the ribbon diaphragm 21. Then, the ribbon diaphragm 21 generates an
electrical signal corresponding to the sound wave. Thus, the side channel microphone unit 20
performs electroacoustic conversion.
[0024]
The right channel microphone unit 30 and the left channel microphone unit 40 have the same
structure as the ribbon microphone unit used in the side channel microphone unit 20, so the
description will be omitted.
[0025]
FIG. 3 is a side view of the stereo microphone 100, depicting only the nondirectional microphone
unit 10 and the side channel microphone unit 20. As shown in FIG.
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As shown in FIG. 3, in the stereo microphone 100, the acoustic terminal of the nondirectional
microphone unit 10 is disposed near the middle in the longitudinal direction of the diaphragm
21 of the side channel microphone unit 20. Also in the right channel microphone unit 30 and the
left channel microphone unit 40, the acoustic terminals of the nondirectional microphone unit 10
are located near the middle in the longitudinal direction of the diaphragm 21.
[0026]
Circuit Configuration of Stereo Microphone FIG. 4 shows a circuit diagram of the stereo
microphone 100. In the stereo microphone 100, the output OMNI of the omnidirectional
microphone unit 10 is separated into two systems via an impedance converter. The output OMNI
thus separated is independently and independently adjusted in output level by the variable
resistor VR11 and the variable resistor VR12 in each system, and is output through the buffer
amplifier.
[0027]
The output BS of the side channel microphone unit 20 can adjust the output level by the variable
resistor VR2 after passing through the transformer. The output BS of the side channel
microphone unit 20 passes through the buffer amplifier and becomes the output S of the side
signal of the stereo microphone 100.
[0028]
The output BR of the right channel microphone unit 30 can be adjusted in output level by a
variable resistor VR3 after passing through a transformer. The output BR of the right channel
microphone unit 30 is added to one of the outputs OMNI of the nondirectional microphone unit
10 through the buffer amplifier (BR + OMNI) to be the output R of the right signal of the stereo
microphone 100.
[0029]
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The output BL of the left channel microphone unit 40 can be adjusted in output level by the
variable resistor VR4 after passing through the transformer. The output BL of the left channel
microphone unit 40 is added to one of the outputs OMNI of the nondirectional microphone unit
10 through a buffer amplifier (BL + OMNI) to become an output L of the left signal of the stereo
microphone 100.
[0030]
Due to the arrangement of the nondirectional microphone unit 10 and the right channel
microphone unit 30 shown in FIG. 1, the output R of the right signal becomes a cardioid having a
directivity axis in the direction of 60 ° around the directivity axis D1. Further, due to the
arrangement of the nondirectional microphone unit 10 and the left channel microphone unit 40,
the output L of the left signal becomes a cardioid having a directivity axis in the direction of -60
° around the directivity axis D1. That is, the stereo microphone 100 can obtain an output of the
XY system by the output R of the right signal and the output L of the left signal.
[0031]
The pointing axes of the right signal output R and the left signal output L can be set by the
directions of the pointing axes D 2 and D 3 of the right channel microphone unit 30 and the left
channel microphone unit 40. The pointing axes of the output R of the right signal and the output
L of the left signal can also be set by adjusting the output level using the variable resistors VR11,
VR12, VR3, and VR4.
[0032]
Further, in the stereo microphone 100, when the output R of the right signal and the output L of
the left signal are added (R + L), the output M of the signal (mid signal) of the mid channel is
obtained. With the output M of the mid signal and the output S of the side channel microphone
unit 20, the stereo microphone 100 obtains an output of the MS system.
[0033]
As described above, according to the stereo microphone 100 according to the present
embodiment, stereo sound according to a plurality of sound collection methods (MS method and
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XY method) can be easily obtained by output addition processing.
[0034]
Moreover, according to the stereo microphone 100 which concerns on this Embodiment, the
sound collection system of several stereo audio | voices can be switched.
[0035]
Further, according to stereo microphone 100 according to the present embodiment, the
orientation of the directional axis is set by changing the arrangement of each microphone unit in
the plane including the sound collection axis S and the setting of the output level of the variable
resistance. Can.
[0036]
Stereo Microphone (2) Hereinafter, another embodiment of the stereo microphone according to
the present invention will be described focusing on differences from the embodiments described
above.
[0037]
The arrangement of the microphone units in the stereo microphone 100 according to the present
embodiment is the same as that of the embodiment described above.
That is, in the stereo microphone 100 shown in FIG. 5, the side channel microphone unit 20, the
right channel microphone unit 30, and the left channel microphone unit 40 are disposed at equal
angles in a plane including the sound collection axis S.
[0038]
The output BR of the right channel microphone unit 30 is added to one of the outputs OMNI of
the nondirectional microphone unit 10 (BR + OMNI) to become an output RF of the right front
signal of the stereo microphone 100.
[0039]
The output BL of the left channel microphone unit 40 is added to one of the outputs OMNI of the
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nondirectional microphone unit 10 (BL + OMNI) to be the output LF of the left front signal of the
stereo microphone 100.
[0040]
In the present embodiment, the output BR of the right channel microphone unit 30 is subtracted
from the output OMNI of the nondirectional microphone unit 10 (OMNI-BR) to obtain the output
LB of the left rear channel of the stereo microphone 100.
[0041]
Similarly, the output BL of the left channel microphone unit 40 is subtracted from the output
OMNI of the omnidirectional microphone unit 10 (OMNI-BL), and the output RB of the right rear
channel of the stereo microphone 100 is obtained.
As in the first embodiment, the outputs BS, BR, BL, and OMNI of the microphone units may be
level-adjusted by variable resistors.
[0042]
As described above, by performing addition and subtraction processing of the outputs of the
microphone units, in the stereo microphone 100, in addition to the outputs RF and LF in the left
and right directions in the ± 60 ° direction with respect to the sound collection axis S Outputs
LB and RB are also obtained.
[0043]
As described above, according to the stereo microphone 100 according to the present
embodiment, in addition to the above description, since the voice behind can be obtained by the
subtraction process of the output, three-dimensional sound collection can be performed. .
[0044]
100 stereo microphone 10 nondirectional microphone unit 20 side channel microphone unit 21
ribbon diaphragm 23 protection plate 24 hole 30 right channel microphone unit 40 left channel
microphone unit
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