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JPH04175099

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DESCRIPTION JPH04175099
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
stereo microphone suitable for application to, for example, a video camera. SUMMARY OF THE
INVENTION The present invention relates to a stereo microphone suitable for application to, for
example, a video camera or the like, wherein a plurality of microphones are separated at a
predetermined interval to perform stereo sound collection. By providing an arm and rotatably
supporting the end of the arm so that each microphone can be moved in and out, it is possible to
reproduce the realism of a compact yet powerful stereo It is a thing. 2. Description of the Related
Art In recent years, the performance of music bands and the like has been photographed on
video, and high performance stereo microphones have been sought for this purpose.
Conventionally, when collecting sound in a video camera, a one-point microphone is often used.
The one-point microphone is an integrated microphone for the left and right channels, and can
be made smaller and lighter, which is particularly effective for a small video camera. In this case,
in order to give a stereo feeling with a one-point microphone, signals obtained by the left and
right microphones are specially processed to generate a phase difference between the left and
right signals. [Problems to be Solved by the Invention] However, in such a conventional example,
although a reduction in size and weight of the microphone can be achieved, there is a problem
that a sufficient stereo feeling can not be obtained. That is, when performing stereo sound
collection, it is usually necessary to separate the left and right microphones by about 20 cm in
order to obtain a sufficient stereo feeling, but in the method of specially processing the signal
obtained by the one point microphone, It is difficult to clarify the localization, and in the
conventional example, there is a problem that the present-step sound lacks a sense of presence.
The present invention has been made in view of the foregoing points, and an object of the
present invention is to provide a small stereo microphone capable of reproducing a realistic
stereo presence. (Means for Solving the Problems) The stereo microphone of the present
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invention is, for example, as shown in FIGS. 1 (A) to 1 (D) (a plurality of microphones (IL). In a
stereo microphone which performs stereo sound collection by separating (IR) at a predetermined
interval, each microphone (IL), (IR) is provided with an arm (2L), (2R) of a predetermined length,
and this arm (IR) 2L) The ends of (2R) are rotatably supported so that the microphones (IL) and
(IR) can be attached and detached freely.
[Operation] In the present invention having the above configuration, since the end of the arm is
rotatably supported, the distance between the microphones changes as the arm rotates.
Therefore, if sound is collected with the microphones separated, it is possible to generate a phase
difference of signals necessary to obtain sufficient stereo spacing, and the localization of sound
becomes clear. On the other hand, when not picking up sound or by picking up the microphones
while keeping the microphones close to each other when there is no need for a sense of reality,
the operation of separating the microphones can be omitted, and the space for the entire
microphone is small ( Become. [Embodiment] An embodiment of a stereo microphone according
to the present invention will be described below with reference to FIGS. 1 to 3. FIG. FIG. 1 (8) to
(D) show the whole construction of this embodiment. In the figure, (IL) and (IR) are microphones
having known configurations, each consisting of a microphone (IL) for the left channel and a
microphone (IR) for the right channel, each of which has single directivity. Stereo sound
collection is possible. The microphones (IL) and (IR) are attached to one end of the arms (2L) and
(2R) in a swingable state, respectively, and the arms (2L) and (2R) have their other ends rotated
with each other. It is supported freely and can be opened and closed. ここで、マイクロホン
(IL)、(11? And arms (2L), (2R) are mounted so as to swing or open and close in the
same plane, and are configured to move in the direction of arrow a or a2. The microphones (IL)
and (IR) are pressed in the direction of the arrow a2 by a spring (not shown) at the connection
with the arms (2L) and (2R), but as shown in FIG. 1 (C) IL), (IR) holding part (IOL). Stoppers are
formed on the tip of the (IOR) and the tips of the arms (2L) and (2R) to hold the microphones
(LL) and (IR) at an angle of about 45 ′ ′ ′ to the arms (2L) and (2R) It is supposed to On the
other hand, arms (2L) and (2R) are also pressed in the direction of arrow a1 by springs not
shown, but as shown in the figure, stoppers are formed on the other end of each arm (2L) and
(2R) The arms (2L) and (2R) are held at an angle of about 90 °. The housing (3) is formed with
an elongated groove (4) to accommodate the arms (2L), (2R).
Incidentally, the groove (4) has a length of a concave arm (2L), (2R), and in the vicinity of the
opening, a taber (4a) having an angle of about 90 ° is formed. ing. A slit (5) is formed on the
back of the housing (3) in parallel with the groove (4). Then, as shown in FIGS. 1 (A) and 1 (D),
the necks (6a) of the projections (6) provided at the connecting portions of the arms (2L) and
(2R) are fitted with the slits (5). It has become. As a result, the arms (2L) and (2R) slide along the
slits (5) and can be inserted into and removed from the groove (4) of the housing (3). The
microphones (IL) and (IR) are operated by a switch (not shown), and can pick up sound even
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when housed in the housing (3). As shown in FIGS. 1 (A)-(D) and 2 (A)-(C), the recesses (3a), (3b)
formed in the bottom and top of the housing (3) , A mounting screw (7) for attaching to the video
camera (V) is passed from the bottom side to the top side, and this mounting style 7) is a knob
provided on the bottom side of the housing (3) It is rotatable by 7a). Also, a projection (8) is
provided in the recess (3b) on the top surface of the housing (3) in proximity to the attachment
means 7). The projection (8) serves to prevent the rotation of the housing (3) when the housing
(3) is attached to the video camera (V). On the other hand, on the bottom of the housing (3), there
are a tripod hole (9) for attaching a tripod (not shown) and a hole (11) for inserting a rotation
preventing protrusion (not shown). It is formed. Incidentally, on the side surface of the housing
(3), a connection portion (12) for supplying an audio signal to the video camera (V) is provided.
That is, the connection terminal (13a) (for example, a pin jack or the like) of the connection cord
(13) is fitted into the connection portion (12). FIG. 3 shows a state in which the present
embodiment is attached to a video camera CV). As shown in the figure, the stereo microphone
(M) according to the present embodiment can be attached to the bottom of the video camera (v).
That is, although a tripod screw hole and a rotation preventing hole (not shown) are provided on
the bottom of the video camera (V), the tripod screw 7) and the projection provided on the
housing (3) of this embodiment are provided. (8) corresponds to these, and insert the tripod for
use 7) and the projection (8) into the above-mentioned hole, and rotate the knob (7a) of the
mounting screw (7) mentioned above to obtain stereo The microphone (M) is fixed to the video
camera (V).
Next, the operation of this embodiment will be described. As shown in FIG. 1 (C), when the
grooves (4) of the housing (3) are pulled out in the direction of the arrow b1 of the arms (2L) and
(2R), the arms (2L) and (2R) are not shown. The spring opens in the direction of arrow A1 to
form an angle of approximately 90 °. As a result, the microphones (IL) and (IR) provided at the
tip of the arms (2L) and (2R) are positioned approximately 20 cm apart. In this case, since the
microphones (IL) and (IR) are configured to form an angle of about 45 ° in the direction of the
arrow a2 with respect to the arms (2L) and (2R), the microphones (IL) and (IR) Become almost
parallel. Therefore, according to the present embodiment, the microphone (LL). Stereo sound
collection can be performed in a state where the (IR) is sufficiently separated, and thereby, even
when photographing a performance of a music band or the like with a video camera, to obtain a
sound full of sense of localization with clear localization of sound Can. In this embodiment, in
addition to the fact that the arms (2L) and (2R) are respectively pressed by the springs in the
direction of the arrow a1, that is, the opening direction, substantially right angles formed in the
groove (4) of the housing (3) The arms (2L) and (2R) do not close due to vibration because they
abut against the taber (4a) that forms the lower end, and they do not rotate in the direction of the
arrow a or the arrow a2. As a result, in the present embodiment, it is possible to always perform
stable stereo sound collection. When the arms (2L) and (2R) are pulled out, the necks of the
projections (6) provided at the connecting portions of the arms (2L) and (2R) contact the ends
(5a) of the slits (5). Because the arms (2L) and (2R) can not be pulled out because they are in
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contact with each other, the contact points between the arms (2L) and (2R) and the housing (3)
increase, so the arms (2L) ), (2R) can be supported with certainty. On the other hand, when the
arms (2L) and (2R) are accommodated in the groove (4), the tips of the arms (2L) and (2R) or the
microphone (IL), (11? ) By hand, close the arms (2L) and (21'l) and slide it in the direction of the
arrow b2. In this case, although the microphones (LL) and (IR) abut each other, since they are
attached in a swingable manner, no problems occur in the arrow a, the relief in the force
direction, and the accommodation. As shown in FIG. 1 (C), the shapes of the microphones (IL) and
(IR) are made in advance so that the microphones (IL) and (IR) become parallel when the arms
(2L) and (2R) are accommodated. It is desirable to set the positional relationship etc. with the
arms (2L) and (211).
Therefore, according to the present embodiment, since the arms (2L) and (2R) can be
accommodated in the housing (3) when imaging is not performed, the configuration can be made
compact. Also, it can protect the arms (21,), (2R) from accidental impact. Also, as in the case of
photographing a person, landscape, etc., when less stereo anger is required, sound can be
collected with the arms (2L) and (2R) housed in the housing (3). As a result, it is possible to save
time and effort for pulling out the arms (2L) and (2R) and to simplify the operation. Although the
present embodiment is configured to be applicable to a video camera, the present invention is
not necessarily limited to this. For example, the present invention can also be applied to audio
equipment such as a small-sized tape recorder. FIG. 4 shows another embodiment of the stereo
microphone according to the present invention. In the following, parts corresponding to the
above embodiment will be described with the same reference numerals. In the present
embodiment, an attachment member (20) for attachment to the video camera (v) is provided on
the bottom surface of the housing (3), and the attachment member (20) Attachment is possible to
the accessory attachment part (121 not shown) of v). Mounting member (20): Yes, the mounting
bracket (20a) corresponding to the accessory mounting portion for mounting accessories such as
a video light, and the fastening of the mounting bracket (20) for fixing the mounting member
(20) ¥ I A material (20b). Then, by fitting this mounting bracket (20b) into the accessory removal
part of the video camera (v) and rotating the fastening member (20b), as shown in FIG. 5, the
stereo microphone (M) becomes a video camera ( It is fixed to the accessory attachment of v).
According to the present embodiment, it is possible to attach to the video camera (v) more stably
and, as shown in FIG. 5, the stereo microphone (M) is positioned above the video camera (v).
Therefore, the video camera (v) can be safely placed. The other configurations and operations are
the same as those of the above-described embodiment, and hence the description thereof is
omitted. FIGS. 6 and 7 show still another embodiment of the stereo microphone according to the
present invention, and in the following, parts corresponding to those of the above embodiment
will be described with the same reference numerals. The stereo microphone (m) of this
embodiment is of the type directly fixed to the video camera (V) as shown in FIG. 7, smaller in
size and lighter in weight than the above embodiment.
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Then, arms (31L) and (31R) are disposed in parallel to the upper and lower portions of the base
(30), and long microphones (32R) and (32L) are provided at the tips of the arms (31R) and (31L).
Each is fixed. Here, the upper arm (31R) is rotatably mounted on the left side of the base (30),
and the microphone (32R) for the right channel attached to the arm (31R) is the base (30). It is
arranged to be vertical on the right side). On the other hand, the lower arm (31L) is rotatably
mounted on the left side of the base (30), and this arm (3) L) the microphone (32I,) for the left
channel attached is It is disposed vertically on the left side of the base (30). Also, a micro-sinch
(33) is provided on the top of the base (30), and the upper arm (3117) is pulled out in the
direction of the arrow C1 to make a microphone (32R). (32 L) is to be operated. And each micro
camera 7 (32R), (32+,) is electrically connected to the video camera (v). When the present
embodiment is used, as shown in the seventh time, the arms (31R) and (31L) are respectively
drawn in the direction of the arrow C8 to open them. As a result, the microphones (32R) and
(32L) are separated by about three times the distance of the base (30), and it becomes possible to
obtain a powerful stereo sound as in the above embodiment. On the other hand, when shooting is
not performed, AR J, (31R). (31L) are respectively rotated in the direction of arrow C2 to close
them, and the microphones (32R) and (32L) are returned to their original positions. The arms
(31R), (31L) and the base (30) are locked by locking members (not shown) at the positions
shown in FIG. 6 and FIG. As described above, according to the present embodiment, in addition to
being able to obtain a powerful stereo sound, there is an effect that downsizing and weight
reduction of the device can be achieved. The present invention is not limited to the above
embodiment, and various modifications can be made within the scope of the present invention.
As described above, in the present invention, each microphone is provided with an arm of a
predetermined length, and the end of the arm is rotatably supported so that each microphone
can freely contact or separate. By doing this, it is possible to reproduce a stereo sound with a
clear and realistic sound localization without increasing the size of the device.
[0002]
Brief description of the drawings
[0003]
1 (A) to 1 (D) show the whole construction of an embodiment of the stereo microphone according
to the present invention, and FIG. 1 (8) is a bottom view, FIG. 1 (B) is a left side view, FIG. (C) is a
partially broken plan view, FIG. (D) is a partially broken right side view, and FIGS. 2 (A) to 2 (C)
show the condition of use of the embodiment. ) Is a perspective explanatory view showing a state
in which the arm is opened and a state in which a tripod spring passes through, FIG. 11 (B) is a
perspective explanatory view showing a state in which the arm is accommodated, and FIG. FIG. 3
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is a perspective view showing the same embodiment attached to a video camera, and FIG. 4 is a
lower perspective view showing the entire configuration of another embodiment of the stereo
microphone according to the present invention, FIG. The figure is a perspective view showing the
same embodiment attached to a video camera, and FIG. Perspective view showing an overall
configuration example, FIG. 7 is a perspective view showing a state of attaching the same
embodiment in the video camera.
In the figure, (IL), (IR) are microphones, (2L), (211) are arms, (3) is a housing, (4) is a groove, and
(5) is a slit. Fig.4 Fig.6 Fig.7 A water filled figure of the thirteen IJ's and No. Kanura 13 in Fig. 6
Fig. 7
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