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The present invention relates to an electroacoustic transducer, in particular a single one,
arranged in a casing, at least one acoustic inlet, in particular for stationary mounting on an
assembly unit, console or lining of a motorized vehicle. The present invention relates to a casing
of a microphone provided with a directional transducer, in particular a casing of a hand-free
BACKGROUND OF THE INVENTION Hand-free microphones for use in car telephones or for
internal communication inside a vehicle transmit useful sound coming from the speaker, as well
as other sound sources such as engine noise and vehicle noise. The disturbance noise is to be
suppressed, thereby ensuring that the speech of the speaker (talker) is well communicated. While
it is preferable to use a directional microphone for this, directional microphones also have
disadvantages. In other words, directional microphones are highly sensitive to solid-borne sound,
and operate in the air flow that is generated by the air flow of the vehicle or generated by the
wind when the window is open or when the vehicle is generally open. And generate an
interference sound.
The use of hand-free devices in motorized vehicles contributes significantly to traffic safety.
However, the interference from various sources often impairs the speaker's familiarity with
speech, which prevents them from talking intensively and, in turn, the necessary concentration
for traffic events. There is a risk of lowering it. While the quality of wireless transmission is often
sufficient, the quality of pick-up of words by microphones is often not sufficient.
Usually, directional microphones are covered with a molding of an open-cell foam material which
calms the turbulence that strikes the microphone holon's diaphragm in order to reduce such
disturbances. By making the foam material body larger, it is possible to reduce the effect of
disturbing noise generated on the surface of the foam material. However, in this case, the
frequency response and directivity of the microphone are negatively affected. Adopting such a
configuration in a vehicle is also limited by the space available and the requirement to secure the
driver's visibility.
It is known from DE 10 2005 021 067 B1 to incorporate a microphone capsule in an acoustic
filter in a handset in order to reduce wind noise. The filter is composed of the respective
chambers and the communication channels, and the mounting points of the microphone capsule
are exactly preset as are the locations of the sound inlets. Such a mounting situation can only be
created in a cost-intensive manner, and additionally requires a large space. Such an approach
sharpens rather than solves the problem of solid-borne sound that is of little concern in the case
of a handset.
[Patent Document 1] European Patent Publication No. EP 0707403A
As described above, the vehicle can be easily installed around the driver's seat of the motor
vehicle without increasing the required space, and in that case, in terms of both the solid
propagation noise and the wind noise. There is a need for a microphone with improved
characteristics over conventional microphones.
An object of the present invention is to provide such a microphone.
SUMMARY OF THE INVENTION In the present invention, the microphone capsule is resiliently
supported in a casing which, in the mounted state, mounts the assembly unit, the console or the
lining of the motor vehicle. And an acoustic entrance disposed in the area of the surface or in the
immediate vicinity thereof.
In this way, on the one hand, it succeeds in significantly reducing the solid-borne sound and, on
the other hand, the taking in of the sound takes place in the area of the surface around the
casing, ie the air flow is This is done in the region where it is formed in layers, so that the wind
noise is removed in a simple and reliable manner.
Embodiments of the present invention are illustrated by the drawings, which are drawn
In the embodiment shown in FIGS. 1 and 2, the casing 7 is composed of two parts, a base 4 and a
cap 1.
The cap 1 has a slit 2 as an acoustic inlet, which is located in a plane perpendicular to the vertical
axis 9 of the casing, ie only schematically of the vehicle part to which the microphone is attached
It is located parallel to the surface 8 shown.
This surface 8 is approximately located in the area where the cap 1 rests on the base 4.
The slits 2 are located just above the surrounding surface 8 so that they are located in the area of
the boundary layer which is formed in layers, as described above, when an air flow occurs.
This layered boundary layer is formed by the surface located in the area of the flow, whatever the
flow, there is no turbulence and therefore the location of the slit 2 which is the acoustic entrance
Then, it is characterized that wind noise does not occur.
Such a measure makes it possible to dispense with a large volume, mechanically stable foam
material of a windproof part, which was conventionally required, and to reduce the frequency
response and the characteristics of the converter associated therewith. , Can be kept without
Inside the casing 7 is elastically supported a unidirectional transducer whose directivity
characteristic is oriented transversely to the symmetry axis of the casing.
The structure and the holding part of the converter are not important to the present invention, so
the detailed description will be omitted.
A person skilled in the art of microphone manufacturing can easily find out the corresponding
solution for a given ambient condition, knowing the invention.
The elastic bearing can be provided by a kind of "floating suspension" on a plurality of rubber
elastic arms or by an elastic support member or by any other method known from the prior art .
The slits 2 may be sealed by acoustic damping material (open-cell foam material, fleece) in a
known manner inside the casing 7, which, in addition to the acoustical action, also dust and
particles Prevent intrusion into the microphone.
The casing 7 can have the mounting member 3 on the casing base 4 or on the cap 1.
When inserting the microphone with the stopper by inserting it into a hole in a wall,
assembly unit, console, etc., the mounting member 3 is a cap 1 that supports the microphone
against tensile force as illustrated. It may be made of snap hooks.
When the microphone is freely attached to the lining or wall member, the wedge formed around
the circumference of the cap 1 can also receive the pressing force.
Depending on the construction, axially oriented ribs 5 can be provided on the outside
circumference of the cap 1 or of the base 4 in order to compensate for possible insertion
A particularly advantageous windproofing action is realized by the fact that the cap 1 does not
disturb the laminar flow of the air flow by its oval shape 6 and by the absence of sharp edges or
The configuration and thickness of the laminar boundary layer of the air flow depend on the flow
generated, surface roughness, pressure changes around the area of interest, etc.
For those skilled in the field of fluid mechanics, knowing the present invention, based on the data
on the installation situation, the thickness of the layered boundary layer is estimated in each case
and determined by some simple experiments in some circumstances, knowing the present
invention Then, it is possible to easily determine the arrangement of the slits 2 in the casing 7.
The invention is not limited to the embodiments described and illustrated above, but can be
varied in many ways.
For example, in particular the slits (or other shaped sound inlets) may be arranged in the base,
the cap taking on substantially only the sealing function. The sound inlet does not have to be in
the form of a slit, and may be made of a penetrating portion such as an oval, a circle, or a
polygon. The casing may be made of any material from which the casing of the electroacoustic
transducer of the prior art is manufactured, and the attachment can also be carried out in
another way than the hooks shown, for example by gluing .
It is important, however, that sound capture only takes place in the area located within the
laminar boundary layer of the air stream flowing through the surrounding surface. The acoustic
inlet is thus located entirely within the area of this boundary layer.
From the above, the present invention can be summarized as follows.
A microphone comprising at least one acoustic inlet, in particular for stationary mounting on a
motor vehicle mounting unit, console or lining, and an electroacoustic transducer, in particular a
unidirectional transducer, arranged in the casing (7), In particular in a hands-free microphone,
the sound inlet (2) is located slightly above the surface (8) surrounding the casing in the
mounted state.
2. The acoustic inlet (2) is located in the area of the layered boundary layer of the surface (8).
3. At least one acoustic inlet (2) has the form of a slit.
4. The sound inlets (2) are arranged rotationally symmetrical, with respect to their axis of
rotation (9).
5. It has an elliptical cross section in the same plane as the surface (8).
6. In the same plane as the surface (8), the corner has a beveled polygonal cross section.
7. It comprises a base (4) and a cap (1), at least one of which holds the mounting member (3).
8. A rib (5) is provided circumferentially in the area of the component to which the casing is
9. It has a radially projecting shoulder which is coplanar with the surface (8).
10. The casing surface roughness is small compared to the thickness of the layered boundary
11. The casing has no edges or corners that disturb the stratified boundary layer.
Brief description of the drawings
1 is a side view showing a casing according to the present invention.
2 is a perspective view showing the casing of FIG.
Explanation of sign
1 cap 2 slit 4 base 7 casing 8 surface
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