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JP2006109467

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
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DESCRIPTION JP2006109467
The present invention provides a microphone that achieves desired directivity characteristics and
accuracy. The invention comprises a microphone, in particular in a housing (1) having at least
one housing opening (5), two pressure gradient capsules (6, 7), each of which is acoustically
transmittable on the front side of the diaphragm And at least one optionally subdivided voice
input aperture (6a, 7a) connected with the at least one optionally split voice input aperture (6b,
7b) acoustically connected to the back side of the diaphragm A hands-free device with a
diaphragm. In order to obtain a compact configuration and directional characteristics that appear
simultaneously with it, an audio input opening (6a, 7a) connected to the front of the diaphragm
in an acoustically transmittable manner and an audio input opening connected to the rear side of
the diaphragm (6b, 7b) are respectively provided in the plane (6c, 7c) of the pressure gradient
capsule (6, 7). [Selected figure] Figure 2
Microphone with two pressure gradient capsules
[0001]
The invention relates to a microphone, in particular at least one housing opening formed in one
housing, comprising two pressure gradient capsules, each of the cells having a diaphragm and
acoustically coupled to the front of the diaphragm. A hands-free device comprising two possibly
subdivided audio input openings and at least one possibly subdivided audio input opening
acoustically coupled to the back side of the diaphragm.
[0002]
04-05-2019
1
A conventional microphone, called combined stereo, is known in which two separate microphone
capsules are located independently of one another.
In order to obtain the desired directional characteristics, the two capsules placed on top of one
another are rotated relative to one another so that the axes of their respective diaphragms are at
an angle to one another. The capsule head is open to the environment and consists essentially of
a metal mesh, resulting in an audio input opening in all directions.
[0003]
There is a large demand for small, space-saving, unobtrusive, robust microphones that are not
subject to mechanical influences (eg shock, vibration etc.), but high quality and at the same time
intentional adjustment of directional characteristics And, at the time of operation, for example, it
is not possible to install a telephone such as a vehicle or an airplane, or to attach a button to a
collar of a shirt, and can be performed barely by a conventional microphone.
[0004]
For this reason, there is a need for certain small, coincidental microphones that have the
sensitivity and, unlike conventional microphones that do not take up space, have the possibility
of changing the directivity characteristics or even exceeding them.
[0005]
According to the invention, these objects consist in that on the input face of the sound input
openings acoustically connected on the front side of the diaphragm and sound input openings
connected acoustically on the back side of the diaphragm An audio input aperture, located in
each of the pressure gradient capsules of each closed in a direction perpendicular to the input
surface and connected to the housing aperture so as to be acoustically transmittable, is first
mentioned as facing at least one space This is achieved by the microphone.
The closed boundaries of the space perpendicular to the input surface prohibit sound from
reaching the input surface and the opening respectively.
[0006]
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2
In this way, with minimal space conditions, it is possible to achieve directional characteristics and
preferred directions, which are most suitable for use in a vehicle conference room or cockpit.
By arranging the pressure gradient capsules parallel and preferentially in a row with one
another, there is no problem in producing very small microphones with very good acoustic
properties. This type of microphone is a button size, and can be arranged as a hands-free device
mounted on a console or shirt collar or the like without a noticeable eye. The above-mentioned
microphones are particularly suitable for being arranged on so-called interfaces, for example the
control panel of a vehicle, a wall or a table surface. With the above interface microphone, direct
sound is preferentially picked up, leaving the reverberant part, ie the reflector part small.
[0007]
The present invention further provides the following means.
[0008]
(Item 1) In a housing (1) having at least one opening (5), a microphone for a hands-free device
comprising two pressure gradient capsules (6, 7), each of the capsules being acoustically
transmittable At least one optionally subdivided audio input aperture (6a, 7a) connected to the
front side of the diaphragm (13), and possibly at least one acoustically connected back side of the
diaphragm (13) The microphone (13) has a diaphragm (13) with finely divided audio input
openings (6b, 7b), and the microphone is connected to the front side of the diaphragm (13) so as
to transmit the sound. 7a) and an audio input opening (6b, 7b) connected to the back side of the
diaphragm (13) so as to be able to transmit sound, and their input surfaces (6c, c) located in each
of the pressure gradient capsules (6, 7) above, the diaphragms (13) of the pressure gradient
capsules (6, 7) being arranged essentially parallel to one another, the voice input openings (6a) ,
6b, 7a, 7b) are directed in at least one space (8, 8 ') closed in a direction perpendicular to the
input face (6c, 7c) and acoustically connected to the housing opening (5) A microphone
characterized by being
[0009]
(Item 2) The item (1) is characterized in that the pressure gradient capsules (6, 7) are arranged in
line with each other with the input face (6c, 7c) designated as the front face running parallel to
the diaphragm face. Description microphone.
[0010]
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(Item 3) The front faces (6c, 7c) of the two pressure gradient capsules (6, 7) face each other, and
the space (8) is formed between the pressure gradient capsules (6, 7) The microphone according
to any one of Items 1 and 2, characterized in that:
[0011]
The front side (6c, 7c) of the two pressure gradient capsules (6, 7) are separated from one
another and are each directed to the associated space (8 '), item 1 and The microphone according
to any one of 2.
[0012]
(Item 5) The voice input opening (6a, 7a) connected to the front side of the diaphragm (13) to
transmit sound and the voice input opening connected to the back side of the diaphragm (13) to
transmit sound. The microphone according to any one of Items 3 and 4, characterized in that (7b,
6b) face away from each other.
[0013]
(Item 6) At least one pressure gradient capsule (6, 7) is supported in the housing (1) so as to be
rotatable on the surface of the diaphragm (13). The microphone according to any one of the
preceding claims.
[0014]
(Item 7) The capsule (6, 7) is disposed between the housing bottom (3) and the housing front (2)
that is essentially parallel to the bottom and preferably closed and slightly curved. The housing
opening (5) is located in the wall (4) and protrudes from the housing front face (2) to the housing
bottom (3) The microphone according to any one of items 1 to 6, characterized in that.
[0015]
8. A microphone according to claim 7, characterized in that the housing opening (5) runs
essentially parallel to the housing front (2).
[0016]
(Item 9) The voice channel (9) is disposed between the space (8), or optionally the space (8 ') and
the housing opening (5), of items 2 to 8 The microphone according to any one of the preceding
claims.
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[0017]
(Item 10) The voice channel (9) and / or space (8), or optionally, two spaces (8 ') are
characterized by being at least partially filled with foam, fibers, wool or the like The microphone
according to item 9, to be.
[0018]
(Item 11) The microphone according to any one of items 9 and 10, wherein the audio channel (9)
has a step, a rib, or the like in the middle thereof.
[0019]
(Item 12) The extension of the space (8, 8 ') parallel to the input face (6c, 7c) is at least twice as
large as the width of the space (8, 8'), preferably at least five times larger. The microphone
according to any one of the preceding claims, characterized in that it is more preferably at least
10 times larger.
SUMMARY The present invention comprises a microphone, in particular a housing having at
least one housing opening, at least one optionally subdivided with two pressure gradient
capsules, each of which is acoustically connected to the front side of the diaphragm A hands-free
device comprising a diaphragm with an audio input opening and at least one optionally split
audio input opening connected in acoustic communication to the back side of the diaphragm.
In order to obtain a compact construction and simultaneously appearing directional
characteristics, the pressure gradient capsule is an audio input aperture connected acoustically to
the front of the diaphragm and an audio input aperture acoustically connected to the rear side of
the diaphragm Are provided on the plane of.
[0020]
The invention will be described in detail below with reference to the drawings.
[0021]
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5
FIG. 1 shows a conventional electrostatic pressure gradient capsule 6 comprising a diaphragm 13
mounted on a diaphragm ring 14.
A diaphragm 13 is installed by means of a spacer ring 15 in order to keep the holes away from
the suitably formed electrode 16.
On one side of the electrode 16 facing away from the diaphragm 13 a so-called acoustic friction
part 17 is provided to acoustically adjust the microphone capsule 6.
The front side 6c has at least two openings, of which one opening 6a allows sound waves to be
input to the front side of the diaphragm 13 and the other opening 6b extends beyond the
components of the capsule The sound wave is allowed to be input to the back side of the
diaphragm 13 through the second conduit composed of the portions 18a, 18b and 18c of
However, the basic feature of the capsule 6 is that both openings 6a, 6b are formed on the same
side of the capsule 6, while the other features described above can be developed in another way.
The above-mentioned pressure gradient capsules are disclosed, for example, in EP 1351549 A2
or the corresponding US 2003 165 251.
Both prior art documents are incorporated herein by reference.
In order to save space and make it visually attractive without acoustical disadvantages, the
capsule can basically be placed on the back side of the coplanar or flat mounting surface.
[0022]
2 and 3 show a microphone according to the invention with two pressure gradient capsules 6,7.
Since these capsules are basically arranged parallel to one another and preferably arranged in a
row, their input faces 6c, 7c and the diaphragm 13 are also parallel to one another.
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The input surface is a surface where the voice input opening is open.
The possible configurations of each capsule are shown in detail in FIG. 1 and in FIGS.
The important features of these pressure gradient capsules are that the voice input openings 6a
and 7a extending to the front side of the diaphragm 13 and the voice input openings 6b and 7b
extending to the back side of the diaphragm are arranged on the input face of the capsule It is in.
As shown in FIG. 1, the diaphragm is essentially parallel to the input surface. In this case, the
input face is designed as the front face. In one embodiment of the invention, it would also be
possible to make the input face perpendicular to the diaphragm.
[0023]
At the same time, a directional characteristic (FIG. 1) which is asymmetrical to the diaphragm
axis 19 is achieved by all the sound input aperture configurations of the input surface. For
example, using the special capsule type described in EP 1351549 A2 or the corresponding US
2003 165 251, the arrangement of two capsules arranged in parallel and simultaneously in a
row, ie two conventional capsules showing the most space saving arrangement As compared to
microphones, it is possible to realize asymmetric directional characteristics without loss of
quality. In the case of the microphone according to the invention, the special capsule type
described in EP 1351549 A2 or US 2003 165 251 is used.
[0024]
One basic feature of the microphone according to the invention is that the voice input opening of
the pressure gradient capsule faces the slit-like space 8 or the two slit-like spaces 8 'and is closed
in the direction perpendicular to the input faces 6c, 7c. The point is. In the embodiment shown in
FIG. 2, this closed limit or boundary is the input face of the adjacent pressure gradient capsule,
while in the embodiment shown in FIG. 3, the sound input openings are acoustically connected to
one another. Facing in the same direction as the direction of the two slit-like spaces 8 'and closed,
for example, in a direction perpendicular to the input face by a surface or wall integral with or
formed by the wall of the housing ing. The input face of each capsule is thereby directed to one
associated space 8 '(FIG. 3). The spaces 8, 8 'have extensions in a direction parallel to the input
04-05-2019
7
surface which is preferably at least twice as large as in the direction perpendicular to the input
surface. In a preferred embodiment, the extension parallel to the input surface is at least five
times larger than the width of the slit-like space 8, 8 'and in a particularly preferred embodiment
the slit-like space 8 in the direction perpendicular to the input surface, At least 10 times larger
than the width of 8. This is basically a split or slit. The embodiment described above not only
saves space but also narrows the spaces 8, 8 and can increase the difference between the two
signals of the capsule.
[0025]
For example, in the case of a circular capsule, the spaces 8, 8 'are disc-shaped, and in the case of
a rectangular capsule, it is in the form of a rectangular parallel pipe. Lateral voice input to the
spaces 8, 8 'can be continuous or can be provided at certain locations, which has an influence on
the directivity of the entire microphone.
[0026]
The closed boundaries allow the sound to travel in the lateral direction of the space 8, 8
'essentially parallel to the diaphragm or input surface. The mode of operation of the microphone
according to the invention will be described in detail below with reference to FIG. The sound
waves reaching the space 8 from the left first reach the sound input opening 7 a which extends
to the front side of the diaphragm of the capsule 7. At almost the same time, the sound waves
reach the sound input opening 6 b extending to the back side of the diaphragm of the capsule 6.
Then, due to the delay, the sound wave reaches the sound input opening 7 b extending to the
back side of the diaphragm of the capsule 7 and reaches the sound input opening 6 a extending
to the front side of the diaphragm of the capsule 6. Thus, in this diametrically opposed
configuration, the two pressure gradient capsules generate signals with different information that
makes it possible to combine the signal processing with the signal processing.
[0027]
On the other hand, the voice input openings 6a, 7a and the voice input openings 6b, 7b directly
face each other (not shown) and can be simply added, but no information is detected from there
basically the same signal Output However, rotating the capsule only slightly apart from one
another processes two different signals. For this purpose, two selection directions, similar to the
04-05-2019
8
clock hands, are rotated relative to one another and to the housing. For this purpose, the capsule
can be rotatably supported. This is done, for example, by means of screws or levers projecting
from the housing.
[0028]
FIGS. 2 and 3 show a preferred embodiment and are characterized in that the two capsules either
face each other (FIG. 2) or face each other (FIG. 3). The special effects obtained by this
configuration are shown below. That is, the direction of vibration or impact, whose inertia causes
deflection of the diaphragm with respect to the capsule housing. In a vehicle, vibrations occur
almost vertically. In a horizontal configuration diaphragm, for example, a console acting as an
interface generates unwanted interference noise in a conventional microphone. By means of the
microphone according to the invention, interference signals induced as a result of the inertia of
the diaphragm are eliminated when the individual signals are brought together. The reason for
this is the fact that although two diaphragms flex in the same direction, one capsule is in the
head with respect to the other capsule, thus forming a signal that is phase shifted by 180
degrees. However, this compensation relates only to the voice of the human body, not to the
voice coming from the space 8 laterally or around the two spaces 8 'in the example of FIG.
[0029]
There are three possibilities to influence and adjust the characteristics of the inventive
microphone.
[0030]
First, the configuration of the front-side audio input aperture determines the directional
characteristics of the capsule taken into account by itself, which of course also determines the
characteristics of the synthesized signal.
There is no need to make the configuration of the sound input aperture of one capsule the same
as the aperture of the second capsule, so it can be another directional characteristic. The
directional characteristics of the composite signal are determined by individual microphone
capsules (kidney-shaped, hyperkidney-shaped acoustic modulation). It is not necessary to
combine the two capsules acoustically equally with kidney bean or super kidney bean, it is
likewise possible to combine green bean or super kidney bean with a single microphone.
04-05-2019
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[0031]
Second, the formed signals are affected at each other at the location of the two capsules. The
sound input openings of the two capsules can be changed relative to each other and to the
housing, since they can be reversed in a plane perpendicular to each other and to the housing
without giving up the requirement of parallelism. In this way, preference directions can be
generated which can be adjusted as well as the hands of the watch. Thus, for example, when
using the microphone of the present invention in a vehicle, one beam can be focused in the
direction of the driver and the other beam can be focused in the direction of the passenger. Also,
the capsule can be rotated to stack two beams so that only the voice coming from the driver's
direction can be heard.
[0032]
Finally, the separately removed signals of the two capsules can be weighted and filtered prior to
combining the signals by signal processing, for example to remove jamming signals and / or
select certain audio signals. The directional characteristics may be affected, and the sensitivity
may be optimized.
[0033]
FIG. 2 shows an embodiment of a microphone according to an embodiment of the invention
comprising a housing 1.
The microphone comprises a closed housing front 2 and a wall 4 projecting towards the housing
bottom 3 from the outer circumference of the housing front 2. In the example embodiment, the
housing front face 2 is somewhat curved, and it may be conceivable that it is curved in the area
of the flat housing front face 2 or its edge. It is important that the front of the housing is closed,
i.e. without an open slit etc, and that the inside of the microphone is covered. In this way, dust
and dirt preferably accumulated on the front face 2 of the housing are prevented from entering
the inside of the microphone system, and the system is better protected from mechanical
influences.
[0034]
04-05-2019
10
The voice input opening 5 is formed in the wall 4 and protrudes from the housing front surface 2
in the direction of the bottom 3 of the housing. In the exemplary embodiment, the housing
opening 5 is essentially essentially parallel to the housing bottom 3 and parallel to the opposite
housing front face 2, but of course an inclined or perpendicular opening is also possible. This
laterally formed housing opening 5 ensures that the sound to be converted can reach the inside
of the microphone without being disturbed, while at the same time forming a barrier against the
impurities present in the air, Can degrade the characteristics of the microphone or even disable it
if it reaches the inside of the microphone without interference.
[0035]
In the housing 1 itself, there are two pressure gradient capsules 6, 7 arranged one above the
other. The capsules 6, 7 are designed such that the two audio input openings 6a, 6b, 7a, 7b of
one capsule are formed on the same side as the capsule housing, the front face 6c or 7c. Either of
the two audio input openings is acoustically connected to the back side of the diaphragm, while
the other side is acoustically connected to the front side of the diaphragm. Examples of pressure
gradient capsules as described above are described in EP 1351549 A2 or the corresponding US
2003165251, which are hereby incorporated by reference. Due to the two sound input openings
formed at a distance from each other, it is possible to realize an asymmetrical directional
characteristic about the diaphragm axis. Notwithstanding the asymmetric directional
characteristics that may change depending on the orientation of the two voice input apertures.
The above capsules can only take small volumes. The feasibility of the acoustic adjustment of the
individual microphone capsules allows all directional characteristics between spherical and
"eight" or octagonal shapes.
[0036]
In the embodiment of FIG. 3, the front sides of the two capsules are rotated away from one
another and are each directed to the space 8. Two identical slit-like spaces 8 'are bounded in a
direction perpendicular to the respective front face 6c or 7c by means of a closed plane or wall
which is integral with the housing or is part of the housing. Two spaces 8 'are connected so as to
be acoustically transmittable with the housing opening 5 preferably through an audio channel
which has room for foam or the like for acoustic friction or dust capture.
04-05-2019
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[0037]
In the example embodiment, only one opening is provided in the front and back side audio inputs
6a, 6b, 7a, 7b of the individual capsules. However, it is also conceivable to form several possibly
small openings arranged in one group of frontal audio inputs and possibly similar openings
arranged in the front-rear audio input openings.
[0038]
A tear-like space 8 is formed between the two capsules 6, 7 (FIG. 2). Arrange the capsules so that
the audio input openings of the two capsules are directed to this space 8. A space 8 is connected
to the housing opening 5 so as to be in acoustic transmission via the audio channel 9. The sound
channel 9 may be filled with a foam for acoustic friction. It would also be conceivable to provide
a direct fit close to the lateral input or support of the housing in the combination of the
embodiments of FIGS. In FIG. 2, the mesh mechanism 12 runs along the peripheral wall 4 of the
microphone, which is arranged closely to the edge 11 connected to the housing bottom and is
connected to the housing front 2 and the housing bottom via the interconnection 10 The housing
opening 5 connected to several parts is subdivided by ribs. In this example, the housing is
configured in two parts, and the cover comprising the housing front face 2 and the wall 4 can be
removed from the housing face together with the opening 5 in the wall. Subdivision into any
other cover and housing base would also be conceivable. The covers can be removed, for
example, to allow easy access to the capsules upon their assembly and replacement.
[0039]
The capsules 6, 7 are mounted on the housing 1 by means of the support members shown only
schematically in FIGS. For example, the type of support members, such as fasteners, adhesives,
spaces between capsules, clamps, etc., are not critical to the invention and can be implemented
by those skilled in the art.
[0040]
The audio channel 9 connecting the housing opening 5 and the tear-off space 8 may have steps,
ribs or the like during its manufacture. On the one hand, they are used for acoustic friction, on
04-05-2019
12
the other hand, they prevent the ingress of dust inside the microphone. For this purpose, the
audio channel 9 can be filled with foam or the like.
[0041]
Of course, it is not necessary to provide the housing openings 5 evenly around the circumference
of the housing, nor to provide one continuous housing opening. However, this has the advantage
of minimizing disturbances due to wind and other air movement. For example, one individual
housing opening or several housing openings may also be present. However, this is provided
non-uniformly for the directional characteristics already specified by the housing.
[0042]
Due to space limitations, it is preferable to place the capsule parallel to the housing bottom 3 and
the housing front 2. The front faces 6c, 7c of the two capsules are essentially parallel to one
another. This compact arrangement saves space and also provides a broad spectrum for signal
processing due to the simultaneous use of two microphones with their own directional
characteristics. Adaptive signal processing algorithms can process, weight, or filter the signals of
different individual capsules independently of one another before combining those signals
together or combining them into one overall signal. In this way, the desired directional
characteristics and preferred direction are realized, making it easier to dispense with signal
supply. One important feature is the fact that by means of an individual evaluation of the
individual frequency ranges, it is possible to achieve uni-directional characteristics which are
essentially independent of the frequency. Digital adaptive signal processing allows the
disturbance noise of the minimized synthetic microphone usage environment to be adapted in
real time to the surroundings, thereby further improving the quality of the call.
[0043]
In the case of both embodiments (FIGS. 2 and 3), the preferred embodiment is such that the
audio input openings 6b and 7b extending to the back side of the diaphragm are essentially
opposite to the audio input openings 7a and 6a extending to the front of the diaphragm In order
to be placed in the capsule. For this reason, two independent signals are acquired and their
weighting, filtering, etc. are then put together to realize the entire microphone system and the
desired directivity and sensitivity.
04-05-2019
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[0044]
In this way, it is possible to adjust in a desired direction the change in the directional
characteristics transitioning from the spherical characteristics to the kidney bean characteristics
by the octagonal shape characteristics of the kidney bean shape and the super kidney bean
shape. The change of directional characteristics can be performed continuously and adaptively in
real time by the signal processing algorithm and simple rotation of the capsule.
[0045]
In a development of the invention in which the impact and vibration do not play a large role as
described above, the capsules 6, 7 are placed close to one another and their input faces form the
lower limits of the slit 8 with one another. The upper wall of the slit is formed by the interior of
the housing front 2 or a flat surface connected thereto. Compared to the microphone of FIG. 1,
the distance between the housing bottom 3 and the housing front 2 in this embodiment is
somewhat longer. On the other hand, a bottom surface whose diameter is further enlarged is
required. A choice can be made between these two variables depending on the need and space
available.
[0046]
The invention is in no way limited by the above description. Thus, more than one pressure
gradient capsule can also be provided to achieve several preferred directions. The installation of
the capsule of the housing and the capsule of its own housing form only serves a secondary role
and can be modified in various ways.
[0047]
FIG. 4 shows a block diagram schematically illustrating a possible application of the microphone
according to the invention. Each capsule 6, 7 produces a separate signal. Each signal is converted
by A / D converters 20, 21 to enable digital processing of the signals. The adaptive filter 22
processes the signal in the following steps. Finally, the resulting signal is converted by D / A
04-05-2019
14
converter 23. The solid lines in FIG. 4 indicate signals having acoustic information, and the
dotted lines indicate signals that change the characteristics of the adaptive filter 22 (for example,
filter coefficients, algorithms, etc.). On the other hand, two separate control signals of the
controller 24 are processed and analyzed to generate control signals, which control the adaptive
filter 22. On the other hand, a control signal is generated as feedback by the adaptive filter 22
and sent to the controller 24 to perform the implemented function.
[0048]
This will be described in detail in the following two embodiments. In both embodiments, the first
capsule of the microphone is directed to the driver, eg, a vehicle, train, etc., and the second
capsule of the microphone is directed to the second driver.
[0049]
Example 1 The controller 24 has an "voice action" algorithm, an algorithm and an identifier, one
of the two capsules providing speech and jamming signals, and one of the two capsules only
jamming signals. Supply. The adaptive filter 22 suppresses unnecessary capsule inputs (jamming
signals only) and equalizes a desired signal (speech) by, for example, a monaural filter that
improves the intelligibility of the speech. The great advantage of this application is the result of
using two directional capsules, which can pick up only the voice from the desired direction and
suppress disturbing voices from all other directions. On the other hand, the space required for
the microphone is the same as that required for a single capsule microphone, but with much
improved signal to noise ratio.
[0050]
Embodiment 2 The controller 24 has an algorithm which also suppresses interference noise. The
first capsule is again directed to the driver and the second capsule is directed to the second
driver. In the first step, the controller detects which of the two is speaking at the same time. Since
signals not including calls are used by the controller 24 and there may be signals including not
only interference signals but also calls, characteristics of diffuse interference noise of vehicles,
trains, etc. are evaluated. By assessing the disturbing signal, it only serves as a variety of
adjustments, and no longer serves only as a possible source. Moreover, with the algorithm
enabling processing of the speech signal, the jamming signal reference is conventional. However,
04-05-2019
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the microphone according to the invention makes it possible to pick up two co-located
interference signals (desired signal and interference signal), which results in significantly
improved estimation accuracy of interference signals and suppression of interference noises. Let
[0051]
Fig. 6 shows a conventional pressure gradient capsule with sound input openings extending on
the front and back sides of the diaphragm on the same side of the capsule. Fig. 6 is a microphone
according to the invention in which the second voice input openings of the two capsules face
each other. Fig. 6 is an embodiment of a microphone according to the invention in which the
second voice input openings of the two capsules face away from each other. Fig. 2 is a block
diagram showing a possible application of the microphone according to the invention.
Explanation of sign
[0052]
DESCRIPTION OF SYMBOLS 1 housing 2 housing front 3 housing bottom 4 wall 5 housing
opening 6, 7 pressure gradient capsule 6a, 6b, 7a, 7b voice input opening 6c, 7c plane 9 voice
channel 10 interconnection 11 edge 12 mesh mechanism 13 diaphragm 14 diaphragm ring
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