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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 and FIG. 2 show the in-vehicle arrangement of
the conventional speaker system, FIG. 3 shows the block diagram of the 3D stereo device, and
FIG. 4 shows the in-vehicle arrangement of the speaker system of the invention. Figure showing
FIG. 5 (a). The mouth shows the in-vehicle positional relationship of the speaker system, and FIG.
6 shows the sound pressure frequency characteristics of the low range. 4L ...... left treble
loudspeaker systems A, 4R ...... right treble speaker system, the speaker system for 5 ······ bass, 6
...... dashboard)%, l
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an on-vehicle 3D
stereo device. With the spread of in-vehicle stereo devices, there is no limit to the claim of the
feature of good reproduction sound. The desire for a stereo device to cover the audio frequency
range makes the speaker system particularly large and incarcerated. The size of the speaker
system that can be mounted on the vehicle is that an enclosure with an internal volume of 1 to 3
liters incorporates a speaker with a diameter of 10 to 12, and the installation location is as
shown in FIG. As shown in FIG. 2, there are small ones installed on the left and right on the tray
panel 7 behind the short circle, as shown in FIG. Those built inside the left and right doors give
the driver and passengers a near-pinaural playback sound, and when listening for a long time 3
there is a defect that causes physiological discomfort, there is a wrinkle and there is a shortage of
bass . When installed on the left and right on the tray panel, the former is not accompanied by
physiological discomfort, but there are people with unnaturalness, with sounds being heard from
the rear. There is no shortage of bass in the former, but it is still not enough. The present
invention is intended to eliminate the fault of obliqueness, and the purpose is to give a sense of
natural sound without physiological discomfort and measure the expansion of the sound to the
lowest frequency range. It is to provide a car-mounted 3D stereo device for obtaining good
reproduced sound. Next, an embodiment of the present invention will be described with
reference to FIGS. Figure 3 shows a 3D stereo universal glock diaphragm, IL, 2L, 4L show left
channel amplifier, bypass filter, treble car speaker system respectively, lR12R14R shows right
channel amplifier, A bypass filter and a speaker system for high-pitched sound are shown, 3L and
3R are low-pass filters respectively, and 5 is a speaker system for bass. If the cutoff frequency of
the bypass filters 24L and 2R is selected to be about 250 Hz or more and the cutoff frequency of
the low pass filters 3L and 3R to about 250 Hz or less, it can be empirically confirmed that the
stereo feeling is not lost. FIG. 4 shows a high sound speaker system 4L and a 4R1 bass speaker
system 5 disposed in the dash panel, and the left and right of the W1 high sound speaker system
4L and 4R from the center line of the car while in the car Deviation of each FL, FR. Assuming that
the deviation of the bass speaker system from the center line of the car to the front passenger
seat is FC, and the angle f with the horizontal line of the bass speaker system is θ, the angle is 0
≦ n ≦ 90 ° O ≦ Fc ≦ W / 43 W / It is mounted so as to satisfy the formula shown by 8 ≦ FL
<W / 23 W / 8 ≦ FR <W / 2.
However, since the low frequency speaker system 5 is mounted with the radiation surface
directed to the apex at the focal position of the horn-shaped concave section having a
substantially parabolic surface, the sound wave emitted from the low frequency speaker system 5
is reflected on the wall of the apex Under the effect of radiation, the radiation efficiency is
improved, and the sound pressure is increased. The rise in sound pressure is about 3 dB between
about 30 and 800 Hz, as shown by the same wave number characteristics in FIG. The output is
about twice that, when it is driven, it produces effects such as times, and it can eliminate the
sense of lack of bass. Also, since the reproduced sound is heard from the front, the physiological
discomfort due to the pinaural sound as described above and the sense of direction of the
unnatural sound coming from behind in the car can be completely eliminated.