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JPS5463816

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DESCRIPTION JPS5463816
Fl specification ░ 1, name of the invention
In-vehicle speaker device
3. Detailed Description of the Invention The present invention relates to an in-vehicle speaker
device for listening in a vehicle compartment of a car, and the in-vehicle speaker device capable
of reproducing high-quality sound even in a vehicle interior in which the mounting of the speaker
is limited in space. To provide First, a conventional speaker apparatus of this type will be
described together with FIGS. In Figs. 1A and 1H, 1 is a car body, 2 and 2 'are front seats
installed in the car, 3 is a rear seat, 4 is a noseble and 5 is a front seat 2 and 2' in the passenger
compartment. A danshboard provided at the front, a rear bord 6 provided at the rear of the rear
seat, and a speaker 7.7 ? attached to the rear board 6 are provided for the left and right stereo
signals from the car stereo device. Applied to and reproduced. In the prior art shown in FIGS. 1A
and 1B, since the speaker 7.7 'is mounted on the rear hood e having a relatively large mounting
space, there is no problem in mounting the speaker, and the front seat 2-- The sound
characteristics at the driver's seat are also good sound pressure frequency characteristics as
shown in FIG. 4, but there is an unnatural sound that sounds like a rear part. In FIG. 4, L is a
sound pressure frequency characteristic of only the left speaker 7 ', and R is a sound pressure
frequency characteristic of only the right speaker 7. FIGS. 2A and 2B are prior art examples in
which the unnatural listening condition of the prior art example is improved, and 8, 8 'are
provided on the front side (cowl side) of the front seat 2.2' in the vehicle interior. EndPage: left
and right speakers at 11 ░, and left and right stereo signals are applied to the speakers 8 and 8
'and reproduced. Although the naturalness is eliminated, as shown in FIG. 2C, the installation of
the speakers 8 and 8 'has a small space, so that the sound radiated to the rear of the speakers ?
and 8' wraps forward, in particular the bass is canceled. Had the disadvantage of FIG. 5 shows
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the sound pressure frequency characteristics of the conventional example shown in FIG. The
present invention eliminates the above-mentioned disadvantages of the prior art, and in the
following, an embodiment of the present invention shown in FIG. 3A. Description will be made
with B. In FIGS. 3A and 3H, 9 is a bass speaker attached to the dash board 6, and 1o and 1? are
treble speakers attached to the front side (cowl side) of the passenger compartment. FIG. 3C
shows the electric circuit of this embodiment, ", 11.11" are input terminals to which the left and
right stereo signals are applied, 12 is an adder for adding the left and right stereo signals, 13 is
an Low-pass filters 14, 14 'are high-pass filters, 1, 5, 16.17 are amplifiers respectively, and 18 is
a variable attenuator.
The two thin high-pitched speakers are mounted on the front side of the vehicle room with ample
space. There is no difficulty in mounting the speakers and all the speakers are arranged in front
of the single room. No natural listening is possible, and only the hitting and extinguishing of the
bass as in the conventional example shown in FIG. 2 occurs, and reproduction is possible over the
entire area as shown in FIG. . In FIG. 6, T indicates the sound pressure frequency characteristics
of all the speakers, L indicates the sound pressure frequency characteristics of the low sound
speaker 9 only, and the sound pressure frequency characteristics of the H "id high sound speaker
10 'only. The on-vehicle speaker device of the present invention is configured as described above,
and according to the present invention, the following effects can be obtained. + 7t (1) You can
install the speaker without difficulty by using the space of the narrow car cabin. (2) The sound is
heard from the front and natural listening becomes possible. (3) The low frequency band is not
canceled, and flat sound pressure frequency characteristics can be obtained over the entire area.
4. Brief Description of the Drawings FIGS. 1A and 1B are respectively a side view and a plan view
showing an outline of a conventional in-vehicle speaker device, and FIG. 2A. ?B? is a side view
and a plan view schematically showing another conventional in-vehicle speaker device, FIG. 2C is
a cross-sectional top view of a main part of the same device, and FIGS. FIG. 3C is an electric
circuit diagram of the same device, and FIG. 4 is a sound pressure frequency characteristic
diagram of the conventional example shown in FIG. FIG. 5 is a sound pressure frequency
characteristic diagram of the conventional example shown in FIG. 2, and FIG. 6 is a sound
pressure frequency characteristic diagram of the embodiment of the present invention. 1 иии и и и
Body, 2, 2 и и и и и и и и и Front seat, 3 и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и -\ 6 ░ ░ ░ rear
'-1-9 ░' for the bass 7 "-force и 1 o и 10 'и и и и и и и и Loudspeaker, 11', 1.1 'и и и? ? ? ? ? ? ? ?
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? ? ?иииииamplifier. Name of agent Attorney Nakao et al. 1 person EndPage: 2 Fig. 1 Fig. 2 Fig. 3
WEndPage: ?
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