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JP2015527851

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DESCRIPTION JP2015527851
Abstract A method, system and apparatus for reducing noise during recording are described. The
noise reduction microphone accessory (100, 600) includes a foam structure (102). The first
cavity (108) extends into the foam structure from the first opening (110) on the surface of the
foam structure. Microphones (304, 406) are inserted into the first cavity. A second cavity (104)
extending into the foam structure from a second opening (106) on the surface of the foam
structure is configured to receive sound from the sound source. The first cavity is in fluid
communication with the second cavity within the foam structure such that a bond is formed
between the first cavity and the second cavity. The junction, the sound cavity and the seal of the
microphone act to shield the microphone's sound receiving element from sounds other than
those received through the second opening. [Selected figure] Figure 3
Noise reduction microphone accessories
[0001]
The present invention relates to reducing unwanted noise picked up by a microphone, for
example, when recording a performance.
[0002]
This application claims priority to US Patent Application Serial No. 13 / 605,589 filed September
5, 2012 and US Patent Application Serial Number 13 / 766,371 filed February 13, 2013 Do.
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These prior applications are incorporated herein by reference in their entirety for all purposes.
[0003]
When the microphone is used to record a performance in a space where processing for recording
sound is not performed, the microphone may pick up a sound unrelated to the performance.
Ambient noise or "room tone" may include noise generated in the space, such as the noise of a
room air conditioner or computer fan. Noise such as traffic noise coming into the space from the
outside may also contribute to the ambient noise level. Ambient noise picked up by the
microphone during performance recording may impair the quality of the recording.
[0004]
Furthermore, the playing sound may be reflected by the inner surface of the space, for example, a
wall, a ceiling, a floor, furniture and the like. When the reflected sound wave reaches the
microphone, the reflected sound wave may be out of phase with the sound wave transmitted
directly from the player to the microphone. These reflected sound waves may be picked up by
the microphone as muddy sound or echo of the performance.
[0005]
Due to these problems, performances are often recorded in a room specially processed for
recording. For example, the interior surface of the room can be treated with a sound absorbing
material to reduce reflections of the playing sound in the room. The windows and doors of the
room can be reinforced or built with materials designed to reduce the ingress of external noise
into the space. Additional measures can be taken to reduce mechanical noise in the room. By
these means, processing the room for recording may require costly and complex attempts.
Furthermore, if the recording is done in the house, it may not be desirable to change the
appearance of the room to suit the recording as needed.
[0006]
Portable recording booths can be assembled in a room that has not been processed for recording.
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The portable recording booth may have walls and ceilings treated with a sound absorbing
material to reduce the amount of reflected sound picked up by the microphone. Booths are
expensive, require complex assembly processes, and may occupy a significant amount of indoor
space when assembled.
[0007]
Embodiments of the present invention solve these and other problems.
[0008]
Methods and apparatus for noise reduction using portable microphone accessories are described.
[0009]
According to one embodiment, the accessory for the microphone comprises a foam structure.
The first cavity extends into the foam structure from a first opening in the surface of the foam
structure.
The first cavity is configured such that the microphone is at least partially sealed in the cavity
such that the sound receiving element of the microphone is completely within the structure. A
second cavity extending into the foam structure from a second opening in the surface of the foam
structure is configured to receive sound from the sound source. The first cavity is in fluid
communication with the second cavity within the foam structure to form a junction between the
first cavity and the second cavity. The junction, the sound cavity and the seal of the microphone
act to shield the sound receiving element of the microphone from sounds other than those
received through the second opening.
[0010]
In another embodiment, a system for noise reduction includes a microphone and means for
placing the microphone in a structure such that the sound receiving element of the microphone
is at least partially sealed inside the structure. . The cavity extends from an opening in the
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surface of the structure to a second position in the structure and an air gap is arranged between
the second position and the sound receiving element when the microphone is held by the
mounting means It is supposed to be.
[0011]
In a further embodiment, the method for reducing noise comprises housing the microphone in a
first cavity in the foam structure through the first opening of the foam structure. The microphone
extends through the first cavity and into the second cavity in the foam structure. The second
cavity is in fluid communication with the first cavity within the foam structure and extends from
the second opening in the surface of the foam structure. The playing sound is received from the
playing source via the second cavity. Sound waves incident on the outer surface of the second
cavity are attenuated by the foam structure.
[0012]
According to another embodiment, the accessory for the microphone comprises a foam structure.
The first cavity extends from the surface of the foam structure into the foam structure. The first
cavity is configured to at least partially seal the portable device within the cavity. The accessory
also has a second cavity extending into the foam structure from a second opening in the surface
of the foam structure. The second opening receives the sound from the sound source. The first
cavity is in fluid communication with the second cavity inside the foam structure to form a
junction between the first cavity, the second cavity, and the seal of the portable device It has
become. The junction acts to shield the sound receiving element of the microphone coupled to
the portable device from sounds other than those received through the second opening.
[0013]
For a better understanding of the nature and advantages of the present invention, reference
should be made to the following description and the accompanying drawings. However, it should
be understood that the drawings are presented for illustrative purposes only and should not be
construed as limiting the scope of the present invention.
[0014]
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3 illustrates an exemplary noise reduction microphone accessory, according to one embodiment.
7 illustrates an exemplary pop filter according to one embodiment. FIG. 7 illustrates the insertion
of pop filters and microphones into an exemplary noise reduction microphone accessory,
according to one embodiment. FIG. 7 is a front view of an exemplary noise reduction microphone
accessory shown mounted in a shock mount, according to one embodiment. 7 is an exemplary
flowchart of a process for noise reduction during recording using a noise reduction microphone
attachment, according to one embodiment. Fig. 6 illustrates an exemplary noise reduction
microphone accessory having a cavity configured to receive a portable device.
[0015]
Embodiments of the present invention relate to reducing noise during recording capture with a
noise reduction microphone accessory. Noise can refer to any unwanted sound, i.e., sounds that
the microphone does not want to be detected during recording. For example, it may be desirable
to reduce noise such as ambient noise and reflections of sound waves generated from the playing
source. The noise reduction microphone accessory can reduce the amount of noise the
microphone picks up during recording.
[0016]
The noise reduction microphone accessory is typically a foam structure, such as a foam sphere.
The noise reduction microphone accessory can have two openings. The microphone may be
inserted into one of the first hollow cavities ("microphone cavities") in the foam structure through
one of the openings. The second opening may be located near a sound source, such as a singer or
a musical instrument. Sound emitted from the sound source travels through the second opening
into the second hollow cavity ("sound cavity"). The microphone cavity and the sound cavity can
be crossed so as to allow the sound from the sound source to be transmitted to the microphone
through the sound cavity. In some embodiments, the microphone can extend through the
microphone cavity and into the sound cavity. In another embodiment, the microphone can be
coupled to a portable device that extends through the microphone cavity and into the sound
cavity.
[0017]
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The microphone can be attached to the foam structure by an elastic connection between the
microphone and the foam structure. The resilient connection can form a seal around the casing
of the microphone. The seal can reduce the amount of noise that enters the sound cavity through
the microphone cavity.
[0018]
In some embodiments, a microphone coupled to a portable device can be used with the noise
reduction microphone accessory. When the term "microphone" is used herein, other devices with
portable devices or microphone accessories can be used. For example, a portable device can
extend through the microphone cavity such that a microphone coupled to the portable device
extends into the sound cavity.
[0019]
The structure surrounding the sound cavity (e.g. foam) is a sound attenuating material that
attenuates the sound waves incident on the outer surface of the sound cavity and attenuates the
sound waves transmitted through the structure into the sound cavity be able to. In some
embodiments, the structure can absorb sound incident on the external surface of the noise
reduction microphone accessory. The structure may further attenuate sound waves incident on
the interior surface of the sound cavity to attenuate sound waves traveling from the sound cavity
through the structure to the exterior of the structure. The structure can further absorb noise
incident on the inner surface of the sound cavity. The playing sound received at the opening and
entering the sound cavity can be directed along the sound cavity to the microphone.
[0020]
FIG. 1 shows a side view of a noise reduction microphone accessory according to one
embodiment. The noise reduction microphone attachment 100 can include a structure 102
having a sound cavity 104 and a microphone cavity 108. In some embodiments, structure 102 is
a foam having sound absorbing properties. For example, structure 102 can be a polyurethane
foam, such as an open cell polyurethane foam. The foam is 40 to 150 pounds per 50 square
inches (lb./50 in <2>), for example 65 to 70 lbs. / 50 in <2>, for example 70 lb. It is possible to
have an Indentation Force Deflection (IFD) at 25% deformation, / 50 in <2>. The foam may have
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a density threshold of 1.5 to 3.5 pounds per cubic foot (PCF), for example 2.45 to 2.65 PCF, for
example 2.5 PCF. Polyurethane foams can be produced in molds. The foam can be made with a
skin layer or can be made without a skin layer or modified to have no skin layer. In a preferred
embodiment, the foam has no skin layer.
[0021]
The structure 102 can have a spherical shape. As described below, the spherical shape allows the
noise reduction microphone accessory to be supported in the buffer mount. Polyurethane foam
may discolor over time, but such discolouration is relatively inconspicuous in foams having a
spherical shape (compared to other shapes) as the spherical surface is uniformly exposed to air It
can be done. The structure 102 may be a sphere having a diameter in the range of 2 inches to 30
inches, for example 4 inches to 12 inches, for example 7.6 inches. The spherical shape can also
facilitate the installation of the noise reduction microphone accessory in the buffer mount. This
allows the noise reduction microphone accessory to be used with the microphone mounted on a
microphone stand with a buffer mount.
[0022]
The sound cavity 104 can extend from the opening 106 on the surface of the structure 102. In
some embodiments, the sound cavity 104 has a cylindrical shape. The cylindrical shape may
allow for equal sound absorption and / or reflection around and within the circumference of the
sound cavity 104. It will be appreciated that due to the sound absorbing properties of the
material from which the structure 102 can be constructed, the reflection of sound generated
within the sound cavity 104 can be low or negligible. The sound cavity 104 may have a diameter
in the range of 1 inch to 12 inches, for example 4 inches to 5 inches, for example 41/4 inches.
The sound cavity 104 may have a length in the range of 3 inches to 15 inches, for example 5
inches to 6 inches, for example 51/2 inches. The distance from the sound cavity 104 to the outer
surface of the structure 102 may be in the range of 1 inch to 6 inches, eg, 11⁄2 inches to 3
inches, eg 2 inches.
[0023]
The microphone cavity 108 can extend from the opening 110 on the surface of the structure
102 and intersect the sound cavity 104. In some embodiments, the microphone cavity 108 has a
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cylindrical shape. The cylindrical shape allows the microphone cavity 108 to accommodate
microphones having various casings such as cylindrical casings, rectangular casings and the like.
The microphone can be inserted into the microphone cavity 108 through the opening 110. The
microphone can extend through the microphone cavity 108 into the sound cavity 104. The
microphone cavity 108 may have a diameter in the range of 1/2 inch to 3 inches, for example 1
inch to 2 inches, for example 13/4 inches. The microphone cavity 108 may have a length in the
range of 1 inch to 6 inches, for example 11⁄2 inches to 3 inches, for example 2 inches.
[0024]
In some embodiments, the microphone cavity 108 can have a rectangular, square, elliptical, or
other non-circular cross section to receive a microphone, portable device, or other device having
a non-circular cross section. For example, a microphone used with the microphone accessory 100
can be coupled to a portable device such as a mobile phone having a rectangular cross section.
The microphone cavity 108 can have a rectangular cross-sectional area configured to receive a
portable device having a rectangular cross-sectional area. When the portable device is inserted
into the microphone cavity 108, the microphone cavity 108 can seal the portable device into the
cavity. Alternatively, a microphone having a cross-sectional area different from the crosssectional area of the microphone cavity 108 by inserting a conversion insertion part, for
example, a conversion cross-sectional insertion part from a circular cross-sectional shape into a
rectangular cross-sectional shape into the microphone cavity 108 Devices or other devices may
be housed. The conversion insert may include one or more pieces of foam material. When
inserted into the microphone cavity 108 with the device, the conversion insert may seal the
device into the microphone cavity 108.
[0025]
In another embodiment, the microphone attachment 100 can have slits or holes instead of the
microphone cavity 108. For example, the slits or holes just allow cables, such as microphone
cables, to pass from the outside of the microphone attachment 100 to a microphone or portable
device disposed wholly or partially in the sound cavity 104. It can be made large enough. The slit
used instead of the microphone cavity 108 can be located at the position of the opening 110.
Alternatively, a slit can be placed opposite the opening 106 so that the cable through the slit to
the microphone is parallel to the long axis of the sound cavity 104.
[0026]
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The microphone should be located at a distance from the opening 106, for example, in the range
of 1 inch to 8 inches, for example 11⁄2 inches to 4 inches, for example 21⁄2 inches Can. The
microphone is also spaced from the end opposite the opening 106 of the sound cavity, for
example, in a range of 1 inch to 8 inches, for example 2 inches to 5 inches, for example 3 inches
It can also be done. Placing the microphone at a distance from the opening 106 allows noise that
enters the sound cavity 104 to interact with the absorbent interior surface of the sound cavity
104 before reaching the microphone in the microphone cavity 108 . For example, noise may
enter the sound cavity at an angle that is absorbed by the inner surface of the sound cavity 104.
The sound cavity 104 may have minimal impact on the performance sound that travels directly
from the performance source to the microphone.
[0027]
The sound cavity 104 and the microphone cavity 108 can be oriented at various angles to one
another. For example, the longitudinal axis of the sound cavity 104 and the longitudinal axis of
the microphone cavity 108 may be at right angles to one another as shown in the illustrative
example of FIG. In other embodiments, the longitudinal axis of the sound cavity 104 can be
centered with the longitudinal axis of the microphone cavity 108 (e.g., a single cavity extending
through the noise reduction microphone attachment is the microphone cavity and the sound). To
serve as both of the cavities, one end of the cavity can receive the microphone and the other end
of the cavity can receive sound).
[0028]
The playing source may be located near the opening 106 of the sound cavity 104. For example,
the microphone accessory 100 can be positioned such that the opening 106 is aligned with the
singer's mouth and faces the mouth. In another embodiment, 106 can be positioned adjacent to
the instrument. Typically, the opening 106 is placed at the same position as when placing a
microphone in order to record the musical performance sound source. Because the microphone
contains precision components, it can be placed at a sufficient distance from the playing source
to protect the microphone from damage if the microphone does not have a protective cover. In
this way, the microphone can be protected from accidental collisions with the instrument or
player. The foam structure of the noise reduction microphone attachment can protect the
microphone by providing shock resistance. Because the structure of the noise reduction
microphone attachment 100 can protect the microphone from vibration or collisions, the
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opening 106 of the noise reduction microphone attachment 100 is more of a musical source
than when the microphone is arranged without the attachment. It can be placed nearby.
[0029]
In some embodiments, multiple microphone accessories 100 can be used when capturing
performance sounds. For example, if a group of instruments, for example a group of percussions
(e.g. a drum set) is used for the performance, different microphones can be used to
simultaneously record each instrument of the group of instruments. Microphone accessory 100
can be used with each microphone. The openings 106 of the sound cavity 104 of each
microphone accessory of the plurality of microphone accessories can be positioned to face
different parts of the drum set or other musical instrument group. In an exemplary embodiment,
certain microphones may be placed at a close-miked position (eg, 1 to 12 inches, eg, 2 to 4
inches) for each drum of the drum set One or more microphones can be placed in close proximity
to each other for one or more cymbals.
[0030]
In another embodiment, the performances of multiple players may be captured using multiple
microphones and accessories 100 for each microphone. For example, if multiple microphones are
used to simultaneously capture the performance of a music group having one or more singers
and / or one or more musical players, accessory 100 can be used with each microphone . The
openings 106 of the sound cavity 104 of each microphone accessory of the plurality of
microphone accessories may be positioned to face each (or a group) of singers and / or
performers.
[0031]
In a further embodiment, the microphone accessory 100 can be used with a boom microphone or
other microphone used to capture performance sounds in video or other video recordings. The
boom microphone is typically located at one end of the boom pole. The other end of the boom
pole can be manipulated or otherwise manipulated by the boom operator. By placing the boom
microphone near the actor or action but outside the frame of the camera, the boom microphone
can be used to capture performance sound associated with the actor or action. The opening 106
of the sound cavity 104 can be positioned to face an actor or action that is the sound source of
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interest.
[0032]
FIG. 2 shows a pop filter 200 that can be coupled to the noise reduction microphone accessory
according to one embodiment. For example, pop filter 200 can be inserted into opening 106 of
the noise reduction microphone accessory 10 accessory. Pop filters are pops (for example,
sounds that can occur when producing the letters "B" or "P") and sibilants (for example, sounds
that can occur when producing the letters "S" or "Z") Can be used to reduce and / or eliminate
pops that occur when the sound is recorded by the microphone. Pop filter 200 can include a base
206 and a lip 204. Base 206 and lip 204 can be metal, plastic, or other material. Base 206 and
lip 204 can be made as a single piece. The lip 204 can extend over the opening 102 and over the
structure 102. Pop filter 200 can include a mesh 202 that extends across the area defined by the
inner periphery of lip 204. The mesh 202 can be, for example, a polyester, metal, or nylon mesh.
It will be appreciated that a variety of materials or structures can be used as pop filters in
combination with the noise reduction microphone accessory.
[0033]
FIG. 3 illustrates the insertion of elements such as pop filters and microphones into the noise
reduction microphone accessory structure 300 according to one embodiment. Pop filter 302 may
correspond to pop filter 200 described with reference to FIG. The pop filter 302 can be inserted
into the opening 306 of the structure 300. The material of the structure 300 is resilient such that
the pop filter can be inserted into the opening 306 of the structure 300 and held in place relative
to the structure 300 by the material of the structure 300 can do.
[0034]
The microphone 304 can be inserted into the microphone cavity 308 of the noise reduction
microphone accessory 300. The material of the structure 300 can be elastic so that microphones
of different sizes can be accommodated by the microphone cavity 308. In some embodiments,
when the microphone 304 is inserted into the opening 308 of the structure 300, the material of
the structure 300 elastically couples the noise reduction microphone accessory 300 to the
microphone 304. If the base of the microphone 304 is so narrow that it does not fit snugly into
the opening 308, a plug-in, for example a foam collar plug-in, can be placed around the
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microphone casing. In this manner, the diameter of the base of the microphone can be increased
to allow the microphone base to fit snugly within the opening 308. When the microphone 304 is
inserted into the opening 308, the resilient coupling between the casing of the microphone 304
(or the collar fixed firmly around the microphone 304) and the opening 308 can form a seal it
can. The seal can reduce the amount of noise that enters the sound cavity through the
microphone cavity. In some embodiments, the resilient connection between the microphone 304
and the opening 308 can allow the noise reduction microphone attachment to be suspended
from the microphone 304 (ie, FIG. 3 180 degrees) As if rotated to).
[0035]
The microphone 304 can include a sound receiving element 310 and a casing 312. The sound
receiving element 310 can include elements such as a capsule, a diaphragm, and a protective
element. Microphone 304 may be any of a variety of microphones. The type of microphone can
be, for example, a capacitor type, an electret capacitor type, a dynamic type, or the like. Typically,
the microphone 304 is designed for use in a recording studio environment, but it will be
appreciated that other microphones can be used. The microphone 304 can have any polarity
pattern, such as omnidirectional, cardioid, hypercardioid, supercardioid, and the like.
[0036]
Noise reduction microphone accessories can enhance the performance of omnidirectional
microphones for the recording of musical sounds. As will be appreciated by those skilled in the
art, omnidirectional microphones pick up sounds coming directly from the singer and sounds
from other directions (e.g. environmental noise and sound reflected from the playing source) in
approximately the same way It may not be desirable to use to record a performance from a
particular source, such as a song. In contrast, when the noise reduction microphone accessory is
used with a nondirectional microphone, the noise reduction microphone accessory receives the
playing sound directly through the sound cavity and attenuates and / or attenuates the sound
arriving from other directions. It can be absorbed.
[0037]
FIG. 4 is a front view 400 of the noise reduction microphone accessory shown shown installed in
a shock mount, according to one embodiment. In some embodiments, the noise reduction
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microphone attachment 402 can be mounted within the buffer mount 404. The buffer mount is a
mechanical fixture that allows the microphone 406 to be suspended within an elastic body
attached to the microphone stand to minimize the transmission of vibrations from the
microphone stand to the microphone. The shape of the noise reduction microphone attachment
allows it to be used with the microphone 406 mounted in a buffer mount. The noise reduction
microphone accessory can also be used with a microphone attached directly to the microphone
stand.
[0038]
In order to mount the noise reduction microphone attachment 402 in the buffer mount 404, the
noise reduction microphone attachment 402 is mounted in a cradle formed by the upper arm of
the buffer mount 404. In this manner, the noise reduction microphone accessory 402 is held in
place relative to the buffer mount 404 by gravity.
[0039]
FIG. 5 is a flow chart of a process 500 for directing sound during recording using a noise
reduction microphone accessory, according to one embodiment.
[0040]
At block 502, the microphone is inserted into a first opening of the noise reduction microphone
accessory 100, for example, an opening 110 of the microphone cavity 108.
At block 504, the microphone may be extended through the first cavity 108 into the second
cavity of the noise reduction microphone attachment 100, eg, the sound cavity 104. At block
506, the playing source, eg, the singer's mouth, may be placed near the second opening, eg,
opening 106, of the noise reduction microphone accessory. At block 508, a microphone may be
used to record sound waves from the playing source that enter the second cavity via the second
opening.
[0041]
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FIG. 6 shows an exemplary microphone accessory 600 having a microphone cavity 608 of
rectangular cross section. In some embodiments, the microphone cavity 608 can be configured to
receive the portable device 612 with the microphone attachment 614. The microphone cavity
608 can extend from an opening 610 on the surface of the structure 102 and can intersect the
sound cavity 104.
[0042]
Mobile device 612 may be a mobile phone, a tablet, a media player, or other handheld electronic
device. Microphone 614 may be a microphone configured to physically and / or mechanically
couple to a portable device. For example, the microphone 614 can be coupled to the portable
device 612 via a connector of the portable device such as USB, 1/8 inch, 30 pin or other
connector. The microphone 614 can be a small microphone, such as, for example, a Mini Mic
from VeriCorder, a Flexible Mini Capsule microphone from Brando Workshop, or a Mikey from
Blue Microphones. The microphone cavity 608 can have a rectangular or other shaped crosssection configured to receive a device having a microphone attached.
[0043]
The embodiments described herein provide a portable device that can be manufactured at low
cost compared to the cost of existing solutions for noise reduction in a recording environment. A
noise reduction microphone accessory can be used for sound recording in home studios,
outdoors, or other environments to prevent the microphone from picking up unwanted sounds
while playing. The microphone can be inserted into the first opening of the noise reduction
microphone attachment and can extend through the microphone cavity into the sound cavity.
The sound cavity can extend from the second opening of the surface of the noise reduction
microphone attachment. The playing sound source is typically arranged near the second opening.
Sound incident on the outside of the noise reduction microphone accessory is attenuated by the
structure of the noise reduction microphone accessory.
[0044]
While the present invention has been described in terms of particular embodiments, one skilled
in the art will recognize that numerous modifications are possible. Thus, while the invention has
been described in terms of specific embodiments, it will be understood that the invention is
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intended to cover all modifications and equivalents falling within the scope of the following
claims.
[0045]
The present invention relates to reducing unwanted noise picked up by a microphone, for
example when recording a performance.
[0046]
100, 300, 402: microphone attachment 102: structure 104: second cavity (sound cavity) 106,
306: second opening 108, 308, 608: first cavity (microphone cavity) 110, 610: First opening
200, 302: pop filter 304, 406, 614: microphone 310: sound receiving element 312: casing 404:
buffer mount 612: portable device
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