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DESCRIPTION JP2012191336

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DESCRIPTION JP2012191336
An object of the present invention is to obtain a stereo ribbon microphone capable of obtaining a
good stereo sound collecting property without being affected by acoustic characteristics due to a
nearby structure even if a plurality of microphone units are arranged in the same plane. A stereo
ribbon microphone (1) in which four ribbon microphone units (2a, 2b, 2c, 2d) are arranged so
that their directivity axes are located in the same horizontal plane. The four ribbon microphone
units 2a, 2b, 2c and 2d are characterized in that they are alternately used for the right channel
and the left channel in the circumferential direction. [Selected figure] Figure 1
ステレオリボンマイクロホン
[0001]
The present invention relates to a stereo ribbon microphone that can obtain good stereo sound
collection without being influenced by acoustic characteristics due to nearby structures even if a
plurality of microphone units are arranged in the same plane.
[0002]
As described in Patent Document 1, the stereo microphone incorporates two microphone units,
and the output of each unit is a signal of two channels on the left and right.
[0003]
An example of such a stereo microphone is a stereo microphone comprising two bi-directional
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microphone units, the directional axes of each unit being -45 degrees to the left and +45 degrees
to the right of the front of the microphone.
The above sound collection method adopted for stereo microphones is called a bloom line array.
The bi-directional microphone units constituting the bloom line array include an electrostatic
condenser microphone unit and a conductive ribbon microphone unit.
[0004]
Generally, two microphone units constituting a stereo microphone are arranged such that their
directivity axes are in the same horizontal plane. However, in the bidirectional microphone unit
used for the bloom line array, it is not preferable in terms of performance to arrange the units of
the left and right channels next to each other because the characteristics deteriorate unless the
nearby structure is symmetrical with respect to the acoustic center.
[0005]
Japanese Patent Application Laid-Open No. 06-303691
[0006]
For this reason, in a general stereo ribbon microphone, as shown in FIG. 9, two bi-directional
units are used vertically stacked.
In the stereo ribbon microphone 1 of FIG. 9, two ribbon microphone units 2 a and 2 b are
vertically stacked and stored inside the microphone case 3, and the external sound is received
through the shield mesh 4 provided in the microphone case 3. The units 2a, 2b are reached.
[0007]
Further, step-up transformers 5a and 5b are provided in the microphone case 3, and the outputs
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from the ribbon microphone units 2a and 2b are output from the 5-pin connector 7 to an
external device through the step-up transformers 5a and 5b, respectively. . The 5-pin connector 7
is composed of the hot side and cold side terminals of the step-up transformers 5a and 5b, and
the ground terminal. Further, in the microphone case 3, a circuit board 6 having a function as a
buffer amplifier is provided.
[0008]
In the conventional stereo ribbon microphone described above, the directional axes of the two
microphone units are present in different horizontal planes, which is not preferable in stereo
sound collection. Since the directional axes of the two ribbon microphone units stacked one
above the other are not in the same horizontal plane, the vertical (upper and lower) biases of the
sound source are distinguished by the upper and lower microphone units, respectively,
particularly with respect to the proximity sound source. The sound is output as a horizontal
(right and left) bias.
[0009]
In addition, since the ribbon microphone unit needs to make the length of the ribbon as a
diaphragm as long as possible so as to obtain higher sensitivity, the vertical direction of the
ribbon microphone unit (the length direction of the ribbon ) Becomes longer. Therefore,
according to the conventional stereo ribbon microphone in which two ribbon microphone units
are arranged in the vertical direction, the vertical gap between the two ribbon microphone units
becomes large, and the left and right sounds are distinguished and collected as a stereo
microphone. There is a drawback that the performance is reduced.
[0010]
Therefore, in the stereo ribbon microphone, it is desired that the suppression of the influence of
the nearby structure on the acoustic characteristics and the good stereo sound collection by the
arrangement of the microphone units in the same plane.
[0011]
The present invention has been made in view of the above problems, and even if a plurality of
microphone units are arranged in the same plane, it is not affected by the acoustic characteristics
due to the nearby structure, and good stereo sound collection can be obtained. It aims to provide
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a stereo ribbon microphone that can
[0012]
The stereo ribbon microphone according to the present invention is a stereo ribbon microphone
in which four ribbon microphone units are disposed so that the directivity axes are located in the
same horizontal plane, and the four ribbon microphone units are arranged in the circumferential
direction. The main feature is that they are alternately used for the right channel and the left
channel.
[0013]
The present invention can provide a stereo ribbon microphone that can obtain good stereo sound
collection without being affected by the acoustic characteristics of nearby structures even if
multiple microphone units are arranged in the same plane. .
[0014]
It is a longitudinal cross-sectional view which shows the Example of the stereo ribbon
microphone which concerns on this invention.
It is a cross-sectional view of the unit part of the stereo ribbon microphone of FIG.
It is a graph which shows the directional characteristic of the said stereo ribbon microphone unit.
It is a circuit diagram of the said stereo ribbon microphone.
It is a graph which shows the measurement result of the acoustic performance of the ribbon
microphone unit for left channels used for the said stereo ribbon microphone. It is another graph
which shows the measurement result of the acoustic performance of the ribbon microphone unit
for the said left channel. It is a graph which shows the measurement result of the acoustic
performance of the ribbon microphone unit for right channels used for the said stereo ribbon
microphone. It is another graph which shows the measurement result of the acoustic
performance of the ribbon microphone unit for the said right channel. It is sectional drawing
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which shows the example of the conventional stereo ribbon microphone.
[0015]
Hereinafter, embodiments of the stereo ribbon microphone according to the present invention
will be described with reference to the drawings. The same reference numerals as in the
conventional example shown in FIG. 9 denote the same parts.
[0016]
As shown in FIG. 1, in the stereo ribbon microphone 1 according to the embodiment of the
present invention, four ribbon microphone units 2a, 2b, 2c, and 2d are positioned in the same
horizontal plane within the microphone case 3 respectively. It is stored. Audio from the outside
reaches the ribbon microphone units 2a, 2b, 2c and 2d through the shield mesh 4 provided in
the microphone case 3.
[0017]
In the microphone case 3, step-up transformers 5 a and 5 b are provided. The outputs from the
ribbon microphone units 2a and 2b are output from the step-up transformer 5a, and the outputs
from the ribbon microphone units 2c and 2d are output from the 5-pin connector 7 to an
external device through the step-up transformer 5b. The 5-pin connector 7 is composed of the
hot side and cold side terminals of the step-up transformers 5a and 5b, and the ground terminal.
Further, in the microphone case 3, a circuit board 6 having a function as a buffer amplifier is
provided.
[0018]
The ribbon microphone units 2a, 2b, 2c and 2d are disposed in the microphone case 3 so that the
directivity axes are located in the same horizontal plane, as shown in FIG. As is well known, in
each of the ribbon microphone units 2a, 2b, 2c, 2d, a magnetic field is formed between a pair of
elongated rectangular permanent magnets, and a conductive ribbon as a diaphragm is disposed
in the magnetic field. There is. The ribbon is fixed at both ends in the lengthwise direction, and
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receives an acoustic wave, the ribbon vibrates and crosses the magnetic flux of the magnetic
field, and an electrical signal corresponding to the acoustic wave is output from both ends of the
ribbon.
[0019]
The ribbon microphone units 2a and 2b are for the right channel, and the ribbon microphone
units 2c and 2d are for the left channel. The right channel microphone units 2a and 2b are
arranged such that the direction of the sound collection axis, that is, the direction orthogonal to
the surface of the ribbon is inclined 45 degrees to the left with respect to the microphone front
direction, and the sound collection axis becomes parallel. It is arranged in three. The left channel
microphone units 2c and 2d are arranged such that the sound collection axis direction, that is,
the direction orthogonal to the surface of the ribbon is inclined 45 degrees to the right with
respect to the microphone front direction, and the sound collection axis is parallel. It is arranged
in three. In addition, the ribbon microphone units 2a, 2b, 2c and 2d are arranged such that the
angle between the directivity axes of the adjacent ribbon microphone units is 90 degrees. The
acoustic centers of these ribbon microphone units are at the center position of the space
surrounded by each microphone unit as shown by point A in FIG. 2, and when viewed from this
acoustic center A, each ribbon microphone unit is symmetrical. In position. The directional
characteristics of these four ribbon microphone units are shown in FIG.
[0020]
In FIG. 3, the solid line indicates the polar pattern of the ribbon microphone unit for the left
channel, and the dotted line indicates the polar pattern of the ribbon microphone unit for the
right channel. The pointing axis of the ribbon microphone unit for the right channel is inclined
45 degrees to the right with respect to the front direction of the microphone, and the pointing
axis of the ribbon microphone unit for the left channel is inclined 45 degrees to the left with
respect to the front direction of the microphone.
[0021]
The circuit configuration of the above-described stereo ribbon microphone 1 is shown in FIG. The
ribbon microphone units 2a and 2b for the right channel and the ribbon microphone units 2c
and 2d for the left channel are respectively connected in series.
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[0022]
The ribbon microphone units 2a and 2b are connected to the primary winding of the step-up
transformer 5a, and the serial output of the ribbon microphone units 2a and 2b is input to the
primary winding. Both ends of the secondary winding of the step-up transformer 5a are
connected to the hot and cold sides of the balanced output via the buffer amplifiers 6,
respectively.
[0023]
The ribbon microphone units 2c and 2d are connected to the primary winding of the step-up
transformer 5b, and the serial output of the ribbon microphone units 2c and 2d is input to the
primary winding. Both ends of the secondary winding of the step-up transformer 5b are
connected to the hot and cold sides of the balanced output via the buffer amplifier 6,
respectively.
[0024]
An audio signal is output to an external device (not shown) from the 5-pin connector 7
configured by the hot side and cold side terminals of the step-up transformers 5a and 5b
described above and the ground terminal.
[0025]
The measurement results of the acoustic performance of the stereo ribbon microphone according
to the embodiment described above are shown in FIGS.
5 and 6 show the acoustic characteristics of the ribbon microphone unit for the left channel, and
FIGS. 7 and 8 show the acoustic characteristics of the ribbon microphone unit for the right
channel. 6 and 8, A indicates a sound collection characteristic in the 0 degree (front direction)
direction, B indicates the 90 degree (horizontal direction) direction, and C indicates the 180
degree (rear surface) direction. As shown in these figures, both ribbon microphone units for the
left and right channels are bi-directional.
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[0026]
According to the stereo ribbon microphone according to the present invention, since the four
microphone units are arranged symmetrically with respect to the acoustic center, the structure in
the vicinity of the microphone unit inside the microphone unit, which has been a problem in the
conventional stereo ribbon microphone It is possible to effectively suppress the influence on the
acoustic characteristics due to In addition, since the four microphone units are arranged so that
their directivity axes are located in the same plane, the bias of the sound source in the vertical
(vertical) direction is output as the bias in the horizontal (left and right) direction. There is no
sound, and good stereo sound collection can be obtained.
[0027]
1 stereo ribbon microphone 2a, 2b, 2c, 2d ribbon microphone unit 3 microphone case 4 shield
mesh 5a, 5b boost transformer 6 circuit board (buffer amplifier) 7 5-pin connector A acoustic
center
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