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JPH05252586

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DESCRIPTION JPH05252586
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to
speaker devices, and more particularly to the placement of high-pitched speakers used in
automobiles.
[0002]
2. Description of the Related Art The method used when good sound reproduction is required is
required to consist of broadcasting in the frequency band desired by several speakers rather than
a single speaker. However, when this is done, the broadcasted frequency band is not treated
equally by all speakers. Rather, in such a case, it is usual, for example, to have high frequency
sound, mid frequency sound and low frequency sound radiated by different speakers, each being
specially matched to the sound area to be broadcast Ru. A crossover network or a speaker
splitting network is placed between the amplifier output and the speakers to enable high
frequency sounds radiated from high tone speakers and low frequency sounds radiated from low
band speakers. Such a speaker splitting network is a very common component, and its mode of
operation does not need to be discussed further.
[0003]
For example, if high-tone speakers, medium-tone speakers and low-pitch speakers are combined
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in a speaker box, the speaker box configured in this way may not be suitable sound even if the
individual speakers are of the best quality. Such drawbacks within certain limitations are
accommodated by the use of an equalizer. Methods in the operation of the equalizer are
generally known and need not be described in detail here.
[0004]
Proper adjustment of the concept of boxes is relatively simple if it is a problem to arrange a box
suitable for large regular spaces (hereinafter referred to as space concepts).
[0005]
However, if the arrangement of the boxes is formed in the interior space of a car, the optimum
method is considerably more difficult than the optimum method in the case of the space concept.
The main reason for this is that the interior of the car is a narrow space, and the presence of the
seat and upholstery produces a strong damping effect. Furthermore, because the space available
for installing the loudspeakers and the entire loudspeaker box in a motor vehicle is extremely
limited, it can, for example, be placed in different positions in different parts of the motor car
without being close to each other. Speakers transmitting channels are generally effective. As
already described in connection with the spatial concept, this type of optimum is not obtained
enough by the acoustic properties that are characteristic of the spatial concept, but the acoustic
reproduction of the car is improved by the use of an equalizer.
[0006]
Since the use of the equalizer does not achieve the optimum of the acoustical properties in the
interior of the vehicle or is achieved only conditionally, the various concepts make it possible to
optimize the acoustics for a specific position in the vehicle, such as the driver's seat. It is
proposed to be limited to asking. However, such an arrangement suffers from the fact that the
optimization of the acoustical properties at a particular position necessarily leads to acoustical
deterioration at all other positions.
[0007]
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SUMMARY OF THE INVENTION It is an object of the present invention to provide a loudspeaker
system which does not have the above mentioned drawbacks and which provides an improved
spatial acoustic reproduction, at least with regard to high tones, and which is substantially
independent of the seat position of the listener. I assume.
[0008]
SUMMARY OF THE INVENTION This problem is solved by providing a housing part having a
generally funnel-shaped recess.
The top and bottom regions of the recess are generally semi-circular and the bottom region is
somewhat smaller than the top region. Two straight lines of approximately equal length joining
the ends of the arcs of the top area and joining the corresponding ends of the arcs that delimit
the bottom area form an angle α of less than 180 ° inside the recess . (Two straight lines define
two flat sidewall portions of the recess) Also, this problem places one of the treble speakers in
one of the flat sidewall portions and the second treble in the other flat sidewall portions Resolved
by placing the speakers. Therefore, both speakers radiate sound pressure in the direction of the
side wall portion of the concavely curved concave section in a vertical cross section as viewed
from the top. Furthermore, the longitudinal axes of the two speakers intersect at an angle β,
which is the angle β = 180 ° −α. According to the applicant's insights, the good acoustic
reproduction characteristics achieved by the loudspeaker device according to the invention can
be realized in the case where the proposed loudspeaker device is installed in both the left and
right halves of the dashboard of the automobile The windshield is obtained by being directly
transmitted to the driver's seat and the passenger's seat without interfering with the radiation of
sound. Substantially independent of the seat position is due to the two treble speakers being set
at an angle with the circular curvature of the housing part to ensure substantially uniform
radiation of high frequency sound in the vehicle. When the loudspeaker device according to the
invention is coupled to a motor vehicle as described above, it has the additional advantage of
being effective for acoustical improvement at high frequencies, as was not achieved by the
equalizer.
[0009]
Advantageous embodiments and further developments of the invention are revealed in claims 2
to 5. Forming an angle β equal to about 30 ° is particularly effective, and this value has been
found to provide optimal sound reproduction in a number of different vehicles. The same can
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also be said for the characteristics (tilt) of the side wall part in a high-pitched loudspeaker
installed as disclosed in claim 5. This does not mean that the angles discussed must be limited to
these particular values. Rather, the domain of the determined value is used in a sufficient range.
[0010]
The invention will now be described in detail with reference to the drawings. The speaker device
1 according to the invention is essentially formed from the housing part 2. The housing part 2
has a circular outer shape and is provided with a generally funnel-shaped recess 4 located at its
center. The semicircular upper region 5 of the recess and the semicircular lower region 6
somewhat smaller than the upper region 5 are the arcs of the upper region 5 or the lower region
6 (in the respective planes of these regions) and their ends 8 Are formed to intersect so as to
form an angle .alpha. Inside the recess. The treble speakers 3.1 and 3.2 are installed in the flat
wall portions 9.1 and 9.2 of the recess 4 (straight lines 7.1 or 7.2 respectively).
[0011]
As can be easily seen from the drawing, the carrot-shaped (cone-shaped) high-pitched speakers
3.1, 3.2 used here are additionally provided with an acoustic diffuser. As clarified in more detail
by FIG. 3, the side wall portions 9.1 and 9.2 are each set at an angle of about 30 ° to the
horizontal bottom area 6 of the recess. The angle .beta., Which is the convergence angle of the
center line (longitudinal axis) of the two treble speakers 3.1 and 3.2, is about 30.degree. In FIG. 1,
since the angle .alpha. Formed by the two straight lines 7.1 and 7.2 is about 150.degree. is there.
[0012]
The recessed shape of the side wall portion 9.3 of the recess 4 is clearly shown by FIG. FIG. 3
shows that the side wall portions 9.1 and 9.2 in which the treble speakers are installed are planar
surfaces.
[0013]
The perspective view of the loudspeaker device according to the invention shown in FIG. 2 shows
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that the transition 10.1 at the end 8 of the semicircular side wall portion 9.3 further joining to
the side wall portions 9.1 and 9.2 is substantially curved. This curved shape has the advantage
that it further improves the acoustical properties of the loudspeaker arrangement according to
the invention.
[0014]
The symmetrical arrangement of the two treble speakers 3.1 and 3.2 in the example presented
here does not represent an essential feature of the invention. For example, there is no reason
why the speaker 9.1 should not be installed at an angle of 10 ° to the line AA of FIG. 1, in which
case the other speaker is installed at an angle of 20 ° to the line AA. A variation of such a
loudspeaker device 1 allows installation at a specific angle to match the acoustic reproduction to
a specific car or / or to optimize it for this specific type of car To allow further improvement of
the acoustical properties in the high frequency range. However, it must be remembered that in
this connection, stereophonic sound reproduction of the car requires housing parts with these
specific angle values provided on each side of the dashboard. This means a considerable increase
in the cost of embossing.
[0015]
When the housing part 2 is formed in a motor vehicle, attention should be drawn to the fact that
its recess 4 is of course covered by a suitable grid.
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