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JPH05292586

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
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DESCRIPTION JPH05292586
[0001]
FIELD OF THE INVENTION The present invention relates to a novel drip-proof stereo
microphone. More specifically, the present invention relates to a so-called built-in stereo
microphone which is used by being attached to a cabinet such as a video camera, and an object
thereof is to provide a stereo microphone also having a drip-proof structure.
[0002]
2. Description of the Related Art In the case where a video camera is used outdoors, it has been
proposed to use a drip-proof specification in order to prevent the intrusion of water into the
interior due to some rain or water splash.
[0003]
However, although the video camera body can improve the structure of the cabinet and increase
its degree of sealing, it is possible to make the drip-proof specification relatively easily, but the
microphone for recording voice is completely free from the structure It is very difficult to use a
drip-proof specification because it can not be shut off to make a sealed specification, and it is
impossible to use a drip-proof specification for reasons that will be described later, especially in
those where stereo recording is possible. Met.
[0004]
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1
That is, in order to record audio in stereo, generally two unidirectional microphones are used.
In this method, directivity is obtained by input from sound holes before and after the microphone
capsule.
[0005]
By the way, if it is intended to obtain a drip-proof effect without being shut off from the outside
air, it is sufficient to simply exclude the entry of water, simply stated.
[0006]
In recent years, various drip-proof sheets having breathability as well as waterproofness (water
repellency) have been invented.
To briefly explain the principle of these drip-proof sheets, focusing on the fact that molecules of
gas such as air are generally smaller than water droplets, they are smaller than droplets on cloth
and are more preferable than molecules of gas such as air. A large number of large pores are
formed, that is, a porous resin is applied.
[0007]
Therefore, in order to make such a microphone a drip-proof structure, for example, covering the
front and rear sound holes with such a drip-proof sheet, or preventing the front of the cabinet in
which the unidirectional microphone capsule is disposed. It is conceivable to cover it with a drop
sheet.
[0008]
However, such a drip-proof stereo microphone has the following problems.
[0009]
That is, in the former method, even if the drip-proof sheet is attached to the sound hole at the
front but is not attached because the lead wire is at the sound hole at the rear, the lead wire is led
out even if it is attached Since the holes are required, only insufficient waterproof and drip-proof
effects can be obtained.
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2
[0010]
Furthermore, in the latter method as well, since the front and back of the microphone capsule are
covered with the drip-proof sheet and the cabinet, unnecessary echo occurs in the space defined
by the drip-proof sheet and the cabinet, and a stereo microphone is produced. As a result, the
desired directivity characteristics can not be obtained, and the sound may not be in stereo.
[0011]
In order to solve the above-mentioned problems, the drip-proof stereo microphone according to
the present invention has two omnidirectional microphone capsules for both left and right
channels, and the microphone capsules each having a desired distance. A box-like cabinet spaced
apart and a circuit for electrically processing an audio signal outputted from the omnidirectional
microphone to give a stereo effect, and drip-proofing on the front of the sound hole of the
microphone capsule The seat for the seat is attached.
[0012]
Therefore, according to the present invention, the built-in microphone capable of stereo
recording, which has been impossible until now, can be made drip-proof without impairing its
function.
[0013]
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of the drip-proof
stereo microphone according to the present invention will be described below in accordance with
the embodiments shown in the attached drawings.
[0014]
Reference numeral 1 denotes a video camera, and a stereo microphone 3 is integrally provided
on the front of the main body 2 thereof.
[0015]
The stereo microphone 3 is provided in the cabinet 4 having a substantially convex cross section
and the cabinet 4 and is non-directional for both left and right (L, R) channels internally fitted in
the substantially cylindrical drip-proof cases 5. The microphone capsules 6, 6 are not shown in
detail, but sound holes 8, 8 are formed on the front faces 7, 7.
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[0016]
Reference numerals 9 and 9 are mounting holes which are drilled on the left and right sides of
the cabinet 4 and for mounting the drip-proof cases 5.
[0017]
Reference numerals 10 and 10 denote protection nets made of metal mesh or the like, which are
attached so as to cover the entire side surface of the cabinet 4 on which the attachment holes 9
are provided.
Further, an internal space 11 is formed in the cabinet 4.
[0018]
The drip-proof cases 5, 5 are made of materials such as synthetic rubber, and it is apparent from
FIGS. 2 and 3 that cylindrical holders 12 and 12 and caps 13 and 13 are closed at one end. The
cap portions 13 and 13 have a substantially annular shape in which sound transmission holes 14
and 14 corresponding to the sound holes 8 and 8 of the microphone capsules 6 and 6 are
formed on the front surface.
Then, a cloth coated with, for example, a tetrafluoroethylene resin, that is, a porous drip-proof
sheet 15, 15 which transmits air but does not transmit water is glued so as to cover the sound
transmission holes 14, 14. ing.
[0019]
Thus, the microphone capsules 6, 6 are internally fitted to the holder portions 12, 12, and
further, the cap portions 13, 13 are externally fitted to the front portions of the holder portions
12, 12 from the outside. It becomes isolated and has a drip-proof structure.
Then, the control cases 5, 5 are mounted in the mounting holes 9, 9 of the cabinet 4 respectively.
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[0020]
Further, since the cap portions 13 and 13 of the drip-proof cases 5 and 5 have a diameter larger
than that of the mounting holes 9 and 9, the drip-proof cases 5 and 5 fit in the mounting holes 9
and 9, respectively. In this state, the cap portions 13, 13 close the space between the mounting
holes 9, 9 and the holder portions 12, 12, and the degree of sealing between the internal space
11 and the outside becomes high.
[0021]
Furthermore, while the drip-proof sheets 15, 15 are porous to allow air permeation, the dripproof sheets 15, 15 are provided between the outside and the microphone capsules 6, 6 in order
to prevent water permeation (water repellency). Even in the interposed state, the sound recording
performance is not impeded.
[0022]
Next, a method for enabling stereo recording by using two omnidirectional microphones will be
described. This method is described in detail in the specification and drawings of Japanese Patent
Application No. 2-132051. To explain briefly.
[0023]
That is, as shown in FIG. 4, reference numeral 16 denotes a stereo arithmetic processing circuit,
which comprises buffer amplifiers 17, 17, delay circuits 18, 18, attenuators 19, 19, adders 20,
20, and equalizers 21, 21.
[0024]
The sound waves recorded by the microphone capsules 6, 6 are converted into electric signals,
are respectively input to the delay circuits 18, 18 through the buffer amplifiers 17, 17, and are
further input to the adders 20, 20 through the attenuators 19, 19. It is input.
[0025]
In this case, the output signals of the attenuators 19, 19 are inverted in polarity, and the L-side
output signal is input to the R-side adder 20, and the R-side output signal is input to the L-side
adder 20. The adders 20 and 20 also receive the output signals of the buffer amplifiers 17 and
17, respectively.
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[0026]
Then, the output signals of the adders 20 and 20 are output to the output terminals 22 and 22 as
audio signals of L channel and R channel via the equalizers 21 and 21, respectively.
[0027]
Then, in the stereo microphone 3 of the present invention, a relatively high sound having a
frequency of 6 KHz or more is already given a sense of stereo by the structure of the cabinet 4
when it is received by the microphone capsules 6, 6. Also, relatively low-pitched sound having a
frequency of 6 KHz or less is electrically processed by the circuit as described above to give a
stereo feeling.
[0028]
Thus, the omnidirectional microphone capsule 6, 6 is internally fitted in the drip-proof case 5, 5,
and the front of the sound hole 8, 8 is covered by the porous drip-proof sheet 15, 15. Therefore,
it is possible to prevent the intrusion of water without disturbing the sound recording.
[0029]
Moreover, the sound collected by the microphone capsules 6, 6 for the left and right channels of
the microphone 3 has a stereo effect due to the structure of the cabinet 4 itself and the electrical
processing, so that a compact built-in stereo microphone can be realized.
[0030]
As is apparent from the above description, according to the drip-proof stereo microphone of the
present invention, the microphone capsule has the property of transmitting air to a position
corresponding to the front of the sound hole and not transmitting water. By internally fitting in a
drip-proof case using a porous drip-proof sheet, a high drip-proof effect can be obtained without
impairing the sound recording performance.
[0031]
Furthermore, the structure of the cabinet gives a sense of stereo to relatively high sound, and
gives a sense of stereo to a relatively low sound by a circuit that performs electrical processing.
[0032]
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Therefore, it becomes possible to manufacture a built-in stereo microphone having a drip-proof
effect, and a video camera, which has been miniaturized in recent years, can be stereo-recorded
and can also have a drip-proof capability. Can answer the needs of products that are becoming
more diversified.
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