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JP2011114623

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DESCRIPTION JP2011114623
Abstract: To provide an audio recorder capable of coping with various scenes while being
compact. An audio recorder is roughly divided into a recorder main body and a pair of
microphone units. Each microphone unit includes a holder 22 rotatable in a plane parallel to the
top surface of the recorder body 12 and a microphone 24 having a single directivity. In the initial
posture in which the long axes of the two holders 22 are substantially parallel to the long axis of
the recorder body 12, the microphones 24 are such that the directivity axis K intersects with the
directivity axis K of the other microphone 24. The pointing axis K is installed inside the holder 22
in a posture in which the pointing axis K is inclined with respect to the long axis of the lens.
[Selected figure] Figure 2
Voice recorder
[0001]
The present invention relates to a portable audio recorder that collects and stereo records audio
through two microphones.
[0002]
Currently, there are many portable audio recorders that can record in stereo.
Many such audio recorders have a vertically elongated, substantially rectangular main body and
two microphones. By providing two microphones in this way, stereo recording becomes possible.
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Also, in many cases, the two microphones are often arranged in a form that protrudes from the
short side of the recorder main body, for reasons of storability and visual stability.
[0003]
However, many of such conventional audio recorders have a problem that it is difficult to obtain
a wide stereo feeling and to cope with various scenes because the distance between two adjacent
microphones is small. That is, when recording voices output from a relatively narrow range, such
as singing voice of one vocal, it is desirable to perform stereo recording at a small intermicrophone distance. Therefore, in such a case, suitable recording can be performed even with a
conventional audio recorder. On the other hand, when recording sounds output from a relatively
wide range, such as in an orchestra, it is difficult to sufficiently capture the spread of sound if the
distance between the microphones is small. Furthermore, in a state where two microphones are
in close proximity, it is difficult to preferably collect sound even when sounds are output from
various places (people) such as a conference. That is, in the conventional audio recorder in which
the distance between the microphones is small, there is a problem that a scene that can be
suitably recorded is limited.
[0004]
Therefore, a large number of audio recorders have been proposed which can change the distance
and posture of two microphones. For example, when the direction substantially parallel to the
upper surface of the recorder body is defined as horizontal and the direction orthogonal to the
upper surface of the recorder body is defined as vertical, two microphones can be rotated about
the vertical axis in Patent Documents 1 and 2 An audio recorder is disclosed. Further, Patent
Documents 3 and 4 disclose an audio recorder capable of swinging two microphones about a
horizontal axis. Further, Patent Document 5 proposes an audio recorder in which two
microphones rotate around a horizontal axis and a vertical axis.
[0005]
JP, 2008-311802, A JP, 58-161387, A JP, 2007-43510, A JP, 2004-254074, A JP, 2007214914, A
[0006]
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However, in patent documents 1 and 2, it is installed so that a directional axis of each
microphone may become parallel to a major axis of a holder (or microphone unit) which stores
the microphone concerned.
In this case, in order to cross the directional axes of the two microphones, it is necessary to
rotate the two holders inward. Conversely, in Patent Literatures 1 and 2, in order to cross the
directivity axes of the two microphones, it is necessary to provide a space between the two
holders to allow inward rotation, and hence the recorder It is necessary to make the short pieces
longer than necessary, which may lead to an increase in the size of the recorder body. In Patent
Documents 1 and 2, since the microphone can be rotated only about the vertical axis, it has been
difficult to cope with more various scenes.
[0007]
Further, the audio recorders disclosed in Patent Documents 3 and 4 can swing the microphone
only around the horizontal axis, and therefore, there is a problem that it is difficult to cope with
more various scenes. Further, in Patent Document 3, the rocking axis when rocking the
microphone is different from the major axis of the microphone holder. Therefore, when the
microphone holder is swung, the microphone holder protrudes beyond the thickness of the
recorder main body, and there is a problem that the apparatus is easily enlarged. Furthermore,
Patent Document 4 can avoid the problem of miniaturization because the microphone structure
is completely incorporated in the recorder body, but has a problem that the swing range is
limited to about 90 degrees.
[0008]
Also in Patent Document 5, there is a problem that the apparatus tends to be large because the
microphone holder protrudes beyond the thickness of the recorder main body with the rotation.
[0009]
Therefore, it is an object of the present invention to provide an audio recorder which is compact
and can cope with various scenes.
[0010]
The audio recorder according to the present invention comprises a substantially rectangular
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main body and a pair of microphone units protruding from one side of the main body and
arranged close to each other, each of the microphone units being rotated in a plane parallel to
the upper surface of the main body A movable holder and a microphone having a single
directivity, in the initial posture in which the long axes of the two holders are substantially
parallel to the long axis of the main body, the pointing axis is the direction of the other
microphone And a microphone installed inside the holder in a posture in which the pointing axis
is inclined with respect to the long axis of the holder so as to intersect with the axis.
[0011]
In a preferred embodiment, each holder is further pivotable about the longitudinal axis of the
holder.
Further, it is desirable that the two holders rotate in a plane around an axis provided in the
vicinity of a corner which is near both ends of one side of the main body.
Furthermore, it is also preferable that the pair of microphone units protrude from a short side of
the substantially rectangular main body, and the short side has a length equivalent to twice the
width of the microphone unit.
[0012]
According to the present invention, the microphone is installed in an inclined state with respect
to the holder, and since the holder is rotatable in a plane parallel to the upper surface of the main
body, the width of the recorder main body can be kept small. It can respond to various scenes.
[0013]
FIG. 1 is a perspective view of an audio recorder according to an embodiment of the present
invention.
It is a schematic top view around a microphone unit.
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It is a schematic top view around a microphone unit. It is a schematic top view around a
microphone unit. FIG. 10 is a schematic top view around a microphone unit in a conventional
audio recorder. FIG. 10 is a schematic top view around a microphone unit in a conventional audio
recorder.
[0014]
Hereinafter, embodiments of the present invention will be described with reference to the
drawings. FIG. 1 is a perspective view of an audio recorder 10 according to an embodiment of the
present invention. Further, in FIG. 2, the microphone units 14 a and 14 b (hereinafter, when the
two are not distinguished, subscripts a and b are omitted and referred to as “microphone unit
14”. It is a schematic top view of a periphery of other members similarly. In the following
description, a direction substantially parallel to the upper surface of the recorder main body 12
will be referred to as a horizontal direction, and a direction substantially orthogonal to the upper
surface will be referred to as a vertical direction.
[0015]
The voice recorder 10 is a device that digitizes voice collected by the two microphone units 14
and then records the voice in a storage medium such as a non-volatile memory. The audio
recorder 10 of the present embodiment is roughly divided into a substantially rectangular
recorder body 12 and a pair of microphone units 14 disposed so as to protrude from a short side
of the recorder body 12.
[0016]
The recorder body 12 is substantially flat as a whole and has a vertically long rectangular
parallelepiped shape. The recorder body 12 incorporates an electronic circuit that performs
various signal processing on the sound collected by the microphone unit 14, a non-volatile
memory as a storage medium, a power supply such as a battery, and the like. The electronic
circuit also includes a controller that switches the content of various signal processing in the
relative positional relationship of the microphone 24 described later. On the surface of the
recorder main body 12, a plurality of operation buttons 16 for receiving an instruction from the
user, a liquid crystal panel 20 for presenting various information to the user, and the like are
provided. Furthermore, the operation button 16 and a plurality of terminal holes 18 and the like
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are also provided on the side surface of the recorder body 12.
[0017]
The pair of microphone units 14 are disposed adjacent to each other so as to protrude from one
short side which is the upper end side of the vertically long recorder body 12. Each microphone
unit 14 is roughly divided into a microphone 24 for actually collecting sound and a holder 22 for
holding the microphone 24.
[0018]
The microphone 24 has directivity of unity and is installed in the holder 22 with its pointing axis
K inclined with respect to the long axis of the holder 22. The inclination angle of the pointing
axis K is not particularly limited, but in the present embodiment, the inclination angle of the
pointing axis K with respect to the long axis of the holder 22 is about approximately so that the
pointing axes K of the two microphones 24 are orthogonal in the initial state described later. The
microphone 24 is installed at an angle of 45 degrees.
[0019]
The holder 22 is a member that holds the microphone 24. The holder 22 (22a, 22b) is
independently rotatable in a horizontal plane centering on a vertical axis m1 provided in the
vicinity of the corner of the recorder main body 12, and the long axis (horizontal axis m2) of the
holder 22 Are independently rotatable around each other.
[0020]
If it demonstrates more concretely, the holder 22 of this embodiment is divided roughly into the
substantially rectangular cavity 26 which incorporates the microphone 24, and the connection
body 28 which connects the said cavity 26 and the recorder main body 12. As shown in FIG. The
hollow body 26 is a substantially rectangular hollow member in which the microphone 24 is
incorporated, and its thickness is approximately equal to the thickness of the recorder body 12
and its width is approximately equal to one half of the short side length of the recorder body 12 .
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Therefore, as shown in FIG. 2, when the two holders 22 are arranged adjacent to each other, the
two holders 22 will fit within the width and thickness of the recorder 10.
[0021]
The connector 28 is a member for connecting the holder 22 to the recorder body 12, and the
base end of the connector 28 is rotatably mounted around a vertical axis m <b> 1 provided near
the corner of the recorder body 12. In addition, a hollow body 26 containing a microphone 24 is
rotatably attached to the other end of the connecting body 28 about the horizontal axis m2. That
is, according to the present embodiment, the holder 22 can be rotated about two vertical axes m1
and m2. The rotation range of each axis is not particularly limited as long as it is mechanically
acceptable, but in this embodiment, it can rotate about 90 degrees around the vertical axis m1
and about 90 degrees around the horizontal axis m2. It is like that.
[0022]
In the following description, as shown in FIG. 2, the major axes of the two holders 22 are parallel
to the major axis of the recorder body 12, and the upper surface of the holder 22 is substantially
parallel to the upper surface of the recorder body 12. The state is called "initial state". And in this
embodiment, in this initial state, each microphone 24 is installed in the holder 22 in a posture in
which the directivity axes Ka and Kb of the two microphones 24 are substantially orthogonal,
that is, a posture in which the so-called XY arrangement is made. .
[0023]
The recorder 10 thus configured can cope with various scenes while being compact. That is, in
order to preferably perform stereo recording, it is desired to appropriately change the relative
positional relationship between the two microphones 24 according to the situation of the sound
source to be recorded.
[0024]
For example, in the case of recording a sound source output from a relatively narrow range such
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as singing voice of one vocal, it is desirable to record in a state in which the two microphones 24
are in close proximity and the directivity axis K is orthogonal It is assumed. On the other hand, in
the case of recording a sound source output from a relatively wide range such as an orchestra, it
is desirable that the directional axes Ka and Kb of the two microphones 24 be widely spread.
Furthermore, when audio is output from multiple directions as in a conference, it is desirable that
the directional axes Ka and Kb of the microphone 24 also be oriented in multiple directions.
[0025]
According to the recorder 10 of the present embodiment, such various situations can be coped
with. That is, when recording a sound source output from a relatively narrow range, such as a
vocal voice of one vocalist, the major axes of the two holders 22 are parallel to the major axis of
the recorder body 12 as shown in FIG. And the upper surface of the holder 22 may be in an
initial state in which the upper surface of the holder 22 is substantially parallel to the upper
surface of the recorder body 12. In this initial state, since the two microphones 24 are close to
each other and their directional axes Ka and Kb are orthogonal, it is possible to record voice with
a sense of depth.
[0026]
On the other hand, when recording a sound source output from a relatively wide range as in an
orchestra, the two holders 22 are rotated in the horizontal plane in a direction away from each
other, and the angle formed by both holders 22 exceeds 90 degrees. It may be moved to a
position which is desirably 180 degrees. That is, the state as illustrated in FIG. 3A may be set. In
this state, the two microphones 24 are separated, and the two directional axes Ka and Kb spread
more largely. As a result, it is possible to record sounds output from a relatively wide range like
an orchestra with a wide sense.
[0027]
When the angle formed by the two holders 22 is more than 90 degrees as described above, the
sound captured by the two microphones 24a and 24b is horizontally reversed. That is, in the
initial state, the microphone 24a that functions as an L microphone that collects the sound on the
left side functions as an R microphone that collects the sound on the right side in the state of FIG.
3A. Similarly, in the initial state, the microphone 24b that functions as an R microphone that
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collects sound on the right side functions as an L microphone that collects sound on the left side
in the state of FIG. 3A.
[0028]
As described above, even if the sound captured by the microphones 24a and 24b is reversed left
and right, unless the signal processing in the subsequent stage of the microphones 24a and 24b
is changed, it is needless to say that appropriate sound recording can not be performed.
Therefore, in the present embodiment, a sensor (not shown) for detecting the rotation angle of
each holder 22 is provided in advance, and the directions of the directional axes Ka and Kb of the
two microphones 24a and 24b are monitored. . Then, when the orientations of the directional
axes Ka and Kb of the two microphones 24 are reversed left and right, the controller notifies the
user of an alarm and urges the reverse operation of the LR. In response to this notification, when
the user operates the operation button 16 to instruct inversion of the LR, the controller uses the
output signal from the microphone 24a as the audio signal of the right channel and the output
signal from the microphone 24b to the left. Vary the signal processing to be stored as the
channel's audio signal. On the contrary, when the directions of the two directional axes Ka and
Kb return to the left and the right, the controller notifies an alarm again to prompt the LR reverse
operation again. In this state, when the user instructs to invert the LR again, the controller stores
the output signal from the microphone 24a as the left channel audio signal and the output signal
from the microphone 24b as the right channel audio signal. Return to signal processing. With
this configuration, stereo recording can be appropriately performed even if the relative positional
relationship of the microphones 24 is changed.
[0029]
In the present embodiment, the inversion of the LR is performed by a manual operation by the
user, but the LR inversion may be automatically performed within the recorder 10. That is,
according to the angle of the directional axis K of the two microphones 24 detected by the
sensor, the controller determines whether the output signal from each of the microphones 24 is
to be processed as the right channel or the left channel. The content of the signal processing may
be switched automatically.
[0030]
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Next, consider the case where speech is output from multiple directions, such as a meeting or a
debate. In such a case, since the voice is often output from an unspecified direction, the
directional axis of the microphone is not only in the horizontal direction but also in the vertical
direction (height direction for accurate sound collection and recording) ) Also need to be
adjusted. Therefore, in such a case, for example, as illustrated in FIG. 3B, after rotating the two
holders 22 by 90 degrees in the horizontal direction, respectively, the holder 22 is further
directed such that the directivity axis K of the microphone 24 faces obliquely upward. May be
turned 90 degrees around the horizontal axis m2. In this state, the sound around the recorder
body 12 can be accurately captured. Further, since the holders 22a and 22b can be
independently rotated about the vertical axis m1 and the horizontal axis m2, the sound collection
direction can be freely set according to the recording environment. As a result, even when audio
is output from an unspecified direction, such as in a meeting or a debate, accurate recording can
be performed.
[0031]
As apparent from the above description, according to the present embodiment, the relative
positional relationship between the two microphones 24a and 24b can be changed as
appropriate, so that accurate recording can be performed even in various situations.
[0032]
By the way, as is clear from the above description, in the present embodiment, the microphone
24 is provided to be inclined with respect to the holder 22.
With such a configuration, the recorder 10 can be further miniaturized. This will be described in
comparison with the prior art disclosed in Patent Documents 1 and 2. In the recorder 10
disclosed in Patent Documents 1 and 2, as shown in FIGS. 4A and 4B, the microphone 24 is
installed such that the major axis of the holder 22 and the directional axis K of the microphone
24 are parallel. Even in this configuration, by rotating the holder 22 in the horizontal plane, the
two microphones 24 suitable for recording sound output from a narrow range are close and the
directional axis K intersects, a so-called state of XY arrangement (see FIG. It is possible to achieve
the 4A state, the sense of depth feeling) and the state where the two microphones 24 suitable for
recording audio output from a wide range are separated (the state of FIG. 4B, the feeling of
wideness feeling) .
[0033]
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10
However, in a state in which the long axis of the holder 22 and the directional axis K of the
microphone 24 are parallel to each other, the two holders 22a and 22b themselves must be
inclined in a direction to approach each other in order to achieve the XY arrangement. In order
to make this inclination possible, a distance W which allows the holder 22 to incline must be
provided in advance between the two holders 22. Due to the provision of the interval W, the
width of the recorder body 12 tends to be large, and there is a problem that downsizing of the
recorder 10 is hindered.
[0034]
On the other hand, in the present embodiment, since the microphones 24 are installed in an
inclined manner with respect to the holder 22 in advance, the XY arrangement, that is, a state in
which the sense of depth is emphasized can be realized without the holder 22 being inclined. As
a result, it is not necessary to provide extra spacing between the two holders 22 in order to
realize the XY arrangement. In other words, if necessary electronic circuits and the like can be
accommodated, the width of the recorder body 12 can be suppressed to about the width of two
holders 22. As a result, further miniaturization of the recorder body 12 can be expected.
[0035]
Further, in the present embodiment, the vertical axis m1 which is the rotation axis of the holder
22 is provided in the vicinity of the corner of the recorder main body 12. By providing the pivot
shaft at this position, the holder 22 can be pivoted to over 90 degrees while avoiding
interference between the holder 22 and the recorder body 12. On the other hand, as shown in
FIGS. 4A and 4B, when the pivot shaft m1 is provided at a position away from the corner, the
holder 22 interferes with the recorder main body 12 when the holder 22 is inclined to some
extent. As a result, there arises a problem that the rotation range of the holder 22 is limited. In
the present embodiment, in order to avoid such a problem, the pivot shaft m1 is provided in the
vicinity of the corner of the recorder body 12.
[0036]
That is, in the present embodiment, it is possible to switch between the recording mode in which
the sense of depth is emphasized (the state of FIG. 3A) and the recording mode in which the wide
sense is emphasized (the state of FIG. There is.
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[0037]
Therefore, in the present embodiment, as described above, since the holder 22 can be rotated on
both the horizontal axis m2 and the vertical axis m1, more various scenes can be coped with.
[0038]
In the present embodiment, since the long axis of the microphone 24 and the long axis of the
holder 22 are not parallel to each other, the direction of the directional axis K of the microphone
24 may be difficult to grasp even if the holder 22 is viewed.
Therefore, it is desirable to present the orientation of the directional axes K of the two
microphones 24 to the user as necessary.
Although various methods can be considered as this presentation method, for example, a light
source that emits light parallel to the directional axis K of the microphone 24 is installed in the
vicinity of the microphone 24 so that the direction of the directional axis K can be grasped by the
direction of the light. May be Further, based on the output from the sensor that detects the
rotation angle around the horizontal axis m2 and the vertical axis m1 of the holder 22, the
posture of each holder 22 and, consequently, the pointing axis K of the microphone 24 built in
the holder 22. The orientation of the image may be calculated, and an image indicating this may
be displayed on the liquid crystal panel 20.
[0039]
Further, in the present embodiment, the user determines the proper positional relationship of the
microphone 24, and the user manually rotates the holder 22. However, such a series of
operations may be automatically performed on the recorder 10 side. For example, a motor or the
like is incorporated in the rotating portion of the holder 22 so that the holder 22 can be
automatically rotated. In addition, when recording starts, the user is allowed to display in
advance several possible scenes on the liquid crystal panel 20 etc., and have one desired scene
selected from the displayed scenes. Then, the motor may be driven so that the microphones 24
are arranged according to the selected scene. For example, when a scene of "voice recording" is
selected, the two holders 22 are rotated so as to be in the initial state. In addition, when the scene
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“meeting” is selected, the holder 22 may be rotated about the horizontal axis m2 and the
vertical axis m1 so as to be in the state of FIG. 3B. Also, as a matter of course, the form of the
directional axis K of the microphone 24 may be selected instead of selecting the scene. Further,
the signal level of the sound collected by the microphone 24 or the sound signal level output
from the microphone 24 is monitored, and the directivity axis K of the microphone 24 is directed
in the direction in which the sound collection or output sound signal level becomes highest. Thus,
the holder 22 may be controlled to rotate.
[0040]
10 audio recorder, 12 recorder main body, 14 microphone units, 16 operation buttons, 18
terminal holes, 20 liquid crystal panels, 22 holders, 24 microphones, 26 hollow bodies, 28
connected bodies, Ka, Kb pointing axes.
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