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JP2017123537

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DESCRIPTION JP2017123537
Abstract: A high-quality uni-directional microphone capable of realizing uni-directionality while
suppressing the sound quality deterioration of a ribbon microphone. SOLUTION: A unidirectional
condenser microphone 2 and bi-directional ribbon microphones 3 and 4 are provided, and a
collection of the unidirectional condenser microphone in a direction of 180 ° of a sound pickup
axis of the bi-directional ribbon microphone. The output axis of the bi-directional ribbon
microphone is offset by the output level of the unidirectional condenser microphone. [Selected
figure] Figure 1
Unidirectional microphone
[0001]
The present invention relates to a unidirectional microphone, and to a unidirectional microphone
that can realize unidirectionality with less deterioration in sound quality.
[0002]
Bidirectional ribbon microphones are considered to have good sound quality, and because of
mass control, good directional frequency response can be obtained in the frequency band above
the low resonance frequency.
However, in order to achieve unidirectionality or non-directionality, it is necessary to use a long
damping acoustic tube. In addition, since the length of the braking acoustic tube is limited, it is
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difficult to obtain a good directional frequency response.
[0003]
On the other hand, a unidirectional condenser microphone can realize a good directional
frequency response even if it is small. Therefore, it is desirable that uni-directionality can be
realized with the sound quality of a good bi-directional ribbon microphone. Also, by making it
unidirectional, it is possible to suppress the occurrence of howling at the time of loud sound.
[0004]
Conventionally, it is known that adding the output levels of a bi-directional ribbon microphone
element and a non-directional condenser microphone element results in uni-directionality. That
is, when the output level of the bi-directional ribbon microphone element shown in the
directional frequency characteristic graph of FIG. 6 (a) and the output level of the nondirectional
condenser microphone element shown in the directional frequency characteristic graph of FIG.
As shown in FIG. 6C, a single directivity characteristic is obtained in which the output level in the
0 ° direction is increased.
[0005]
In Patent Document 1, the applicant discloses a stereo microphone having one non-directional
condenser microphone unit and two bi-directional ribbon microphone units. In this stereo
microphone, the directivity axes of the two bi-directional ribbon microphone units are arranged
to form a predetermined angle in the same plane with respect to the central axis of the directivity
axis of the stereo microphone, and the omnidirectional The microphone unit has an acoustic
terminal disposed close to the acoustic terminal of the bi-directional microphone unit. According
to this stereo microphone, it is possible to obtain a stereo microphone that is excellent in
directional frequency characteristics.
[0006]
JP, 2015-111812, A
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2
[0007]
However, in the case of adding uni-directionality by adding the bi-directional ribbon microphone
element and the output level of the non-directional condenser microphone element, half of the
output level shown in FIG. 6C is non-directional. There is a problem that the sound quality is
deteriorated by the addition because it is the sound of the condenser microphone.
[0008]
The present invention has been made focusing on the above-described points, and it is an object
of the present invention to provide a high-quality uni-directional microphone capable of realizing
uni-directionality while suppressing deterioration in the sound quality of a ribbon microphone.
Do.
[0009]
In order to solve the problems described above, a unidirectional microphone according to the
present invention includes a unidirectional condenser microphone and a bi-directional ribbon
microphone, and the sound collecting axis of the bi-directional ribbon microphone is 180 °. The
sound pickup axes of the unidirectional condenser microphones are arranged so that the 0 °
directions of the sound pickup axes of the unidirectional condenser microphones coincide with
each other, and the 180 ° output level of the bidirectional ribbon microphone is the output level
of the unidirectional condenser microphones. It is characterized by being reduced by
It is preferable that two bi-directional ribbon microphones be provided, and the two bi-directional
ribbon microphones be symmetrically disposed on the left and right of one of the condenser
microphones.
[0010]
By this configuration, the level in the 180 ° direction of the sound collection axis of the bidirectional ribbon microphone is reduced by the output level of the uni-directional condenser
microphone, so that the sound quality of the ribbon microphone is not impaired. Directivity can
be realized.
Moreover, howling can be prevented when this unidirectional microphone is used for speech.
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[0011]
It is possible to obtain a high-quality uni-directional microphone capable of realizing unidirectionality while suppressing the sound quality deterioration of the ribbon microphone.
[0012]
FIG. 1 is a front view of the unidirectional microphone according to the present invention (a view
from the sound collecting axis 180 ° side).
FIG. 2 is a plan view of the unidirectional microphone of FIG.
FIG. 3 is a side view of the unidirectional microphone of FIG. FIG. 4 is a circuit diagram of the
unidirectional microphone 1 of FIG. 5 (a) to 5 (c) are directional frequency characteristic graphs
of microphone elements constituting the unidirectional microphone shown in FIG. FIGS. 6A to 6C
are directional frequency characteristic graphs of a bidirectional ribbon microphone element and
an omnidirectional condenser microphone element constituting a conventional unidirectional
microphone.
[0013]
Hereinafter, embodiments of the present invention will be described based on the drawings. FIG.
1 is a front view (a view from the sound collecting axis 180 ° side) of the unidirectional
microphone according to the present invention, FIG. 2 is a plan view, and FIG. 3 is a side view.
FIG. 4 is a circuit diagram of the unidirectional microphone 1.
[0014]
As shown, the single directional microphone 1 includes one single directional condenser
microphone 2 and two bi-directional ribbon microphones 3 connected in series symmetrically in
a symmetrical manner so as to sandwich the single directional condenser microphone 2. , 4 (only
one ribbon microphone is shown in FIG. 4). Specifically, the bidirectional ribbon microphones 3
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and 4 are disposed such that 0 ° of the sound collection axis of the unidirectional condenser
microphone 2 coincides with the 180 ° direction of the sound collection axis of the bidirectional
ribbon microphones 3 and 4 The output levels of the unidirectional condenser microphone 2 are
subtracted from the output levels of 3 and 4.
[0015]
FIGS. 5A to 5C show directional frequency characteristic graphs of the microphones. 5 (a) shows
the directional frequency characteristics of the bidirectional ribbon microphones 3 and 4, FIG. 5
(b) shows the directional frequency characteristics of the unidirectional capacitor microphone 2,
and FIG. 5 (c) shows the unidirectional frequency characteristics. 6 shows the directional
frequency characteristics of the dynamic microphone 1.
[0016]
As shown in FIG. 5 (b), the unidirectional condenser microphone 2 has no response in the 0 °
direction of the sound collection axis of the bidirectional ribbon microphones 3 and 4 shown in
FIG. 5 (a). Therefore, at the output of the unidirectional microphone 1, as shown in FIG. 5 (c), the
level in the 180.degree. Direction of the sound pickup axis of the bidirectional ribbon
microphones 3, 4 is reduced to become unidirectional. . That is, only the bi-directional ribbon
microphones 3 and 4 have sensitivity to sound waves from the 0 ° direction of the sound
collection axis of the bi-directional ribbon microphones 3 and 4.
[0017]
In the circuit diagram of FIG. 4, the output (PIN 3) of the unidirectional condenser microphone 2
and the outputs (PIN 2) of the bidirectional ribbon microphones 3 and 4 are balanced and
output, and the difference is generated in the mixer (not shown). The input is dynamic and the
subtraction output is obtained from the mixer. The outputs of the bi-directional ribbon
microphones 3 and 4 are stepped up by a transformer T and output to PIN2. Note that PIN1 is a
ground potential (GND), and one end of the unidirectional directivity condenser microphone 2
and one end of the transformer T are connected.
[0018]
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As described above, according to the present embodiment, the level in the 180 ° direction of the
sound collection axis of the bidirectional ribbon microphones 3 and 4 is reduced by the output
level of the unidirectional capacitor microphone 2. Unidirectionality can be realized without
losing the sound quality of the ribbon microphone. Moreover, howling can be prevented when
this unidirectional microphone is used for speech.
[0019]
In the above embodiment, the two bi-directional ribbon microphones 3 and 4 are arranged
symmetrically with respect to one condenser microphone 2. However, in the present invention,
the present invention is not limited to this configuration. Instead, one bi-directional ribbon
microphone may be used. Moreover, the usage pattern of the unidirectional microphone 1
according to the present invention is not limited, and the microphone can be suitably used as a
hand microphone, a stand microphone, or the like.
[0020]
1 Unidirectional Microphone 2 Unidirectional Condenser Microphone 3 Bidirectional Ribbon
Microphone 4 Bidirectional Ribbon Microphone
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