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JPS5531384

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
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DESCRIPTION JPS5531384
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an explanatory view showing the arrangement
of power according to the present invention, and FIG. 2 is a circuit diagram showing a connection
between each speaker and an amplifier showing an embodiment of the present invention, FIG. 3
is a table showing the relationship between the switching position of the changeover switch and
the actuating speaker in the embodiment of FIG. 2, and FIG. 4 is a circuit diagram similar to FIG.
2 showing another embodiment of the present invention. 1-4 ...... speaker, 5 ...... rear parcel tray,
6 ...... backseat, 8,9 ...... occupant, 10.12 ... ... power amplifier, (amp), 11 ...... selector switch, 13 ...
... Trimmer volume, 14 ...... Boriumuyu, knit.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a loudspeaker
device for a vehicle such as a car. In the prior art, for example, the rear speakers in a car have
been mounted as a left-right pair at both ends of the reservoir cell tray. Therefore, the left and
right speaker positions have a large ratio of distances to the occupants in the rear seat and the
occupants respectively, so the volume of sound heard from the left and right speakers can not be
balanced at the time of stereo broadcast reception or tape reproduction. It was turned to the side
of the nearer speaker, and a good stereo effect was not inserted. 3 If it was corrected by the
balance adjustment of the car radio body or the amplifier, then the stereo balance in the front
seat would be lost. It became a result. The present invention has been made to solve the abovementioned problems. The presence of the rear seat in the vehicle parcel tray and the presence of
the occupant in the rear seat are respectively 2-to-symmetrical with respect to the signals of
different channels. A total of four speakers are provided, one for each set of playback, and all or
part of them can be selected and operated, and it is also good for the rear seat in any of the left
and right seat positions and also for the front seat. An object of the present invention is to
provide a speaker apparatus for a vehicle in which a stereo feeling can be obtained. Hereinafter,
an embodiment of the present invention will be described with reference to the attached
drawings. FIG. 1 is a view showing the arrangement of speakers, in which two sets of speakers 1,
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2 and 6.4 can be embedded and arranged in a vehicle parcel tray 50 of a vehicle. The speakers 1
and 2 are disposed symmetrically with respect to the occupant 8 in the rear seat 6, and the
loudspeakers 6.4 are disposed symmetrically relative to the occupant 9 in the seat. FIG. 2 is a
view showing a connection relationship between each speaker and a power amplifier (hereinafter
referred to as “amplifier 1”). 10 is a 2-channel amplifier and inputs a right channel signal
(hereinafter referred to as "R signal") and a left channel 7 non-unified signal (hereinafter referred
to as "L signal"), and low cycle-3 = wave amplification and output Do. Then, an R signal is
supplied to the speakers 1 and 6 and an L signal is supplied to the speakers 2 and 4 through the
4-circuit 4-contact switch 11. The changeover switch 11 is connected such that when the
movable contact is switched to the fixed contact point IL2, a signal is supplied to a speaker
shown by .smallcircle. In FIG. Therefore, when the changeover switch 11 is set to "A", all four
speakers 1 to 4 operate, L4 = 5 from the speaker 1.6, and R signals from the speakers 2 and 4
are reproduced. Therefore, the occupant 8 in the buttock seat 6 has speakers 1 and 2 VC, the
occupant 9 in the seat has speakers 3 and 4, and the occupant in the front seat has a sense of
stereo by the speakers 1 and 4 respectively. It is possible to get
Further, when the occupant 8 is present only in the rear seat 6, the changeover switch 11 is set
to 10 ", and when there are nine passengers only in the presence, the changeover switch 11 is set
to" ha ". Only the speakers 1 and 2 for the seat or the speakers 6 and 4 for the seat are operated,
and when there are no occupants in the rear seat 6, "two" and the speaker for the outside and for
the outside If only 1 and 4 are operated, better stereo feeling can be obtained. In addition, the
switching position of "I" of the changeover switch 11 may be deleted so that all the four speakers
1 to 4 are not operated at the same time. . Next, FIG. 4 is a circuit diagram of another
embodiment of the present invention. When all four speakers 1 to 4 are operated at the same
time, the speakers 2 and 3 at the central portion interfere with each other and the sense of stereo
is lost. It was something that was not to be feared. That is, the central speakers 2 and 6 are
operated with the difference signal of the appropriately weighted R signal and L signal. In this
embodiment, the speakers 1 and 4 at both ends of the rear parcel tray are driven by the R and L
signals from the amplifier 10, respectively. On the other hand, the L signal from the amplifier 10
is supplied to the plus terminal of the central speaker 2 and the R signal with the power from the
amplifier 12 is supplied to the minus terminal. It is driven. The speaker 3 is similarly driven by
the signal of R-L /. Here, the 5-value of に is varied by adjusting the semi-fixed volume 16 at the
front stage of the amplifier 12. Further, the volume adjustment of the whole is performed by the
volume unit 14. The effects of this arrangement will be described below. Referring to FIG. 1,
assuming that the ratio of the distance between one occupant 8 and the speakers 2 and 6
disposed at the central portion of the rear bar cell tray 5 is temporarily 1: 1.4, Then, the level of
the reproduction sound by the speaker 3 at the position of the one occupant 8 is approximately
half the level of the reproduction sound by the speaker 2. ここで。 When the signal of L−R / 2
from the speaker 2 is reproduced from the speaker 6 by I (when the signal of −l / 2 (K−2) is
reproduced), the reproduced sound to be heard by one passenger 8 is from both speakers 2 ° 6
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The acoustic power of is synthesized as in the previous level ratio 1: 1/2 as follows. (L− 且) +1
(R−upper) Once ■, 2224 In addition, approximately 1⁄4 of the reproduced sound of the old
signal from the speaker 4 farthest from the occupant 8 or the R signal reproduced from the
speaker 1 Because it can be synthesized and heard at the level, 3/4-1 + 1/4 L = L, and the R
signal and the L signal 6- can be heard in perfect balance.
Very good stereo effects are obtained. Similarly, for the passenger 9 in the seat, the synthesized
sound of the speakers 2, 6 and 3 / 4H is heard, and further, about 1/4 R from the speaker 1 is
synthesized, and an R signal synthesized from the speaker 1.2.3 However, the L signal from the
speaker 4 can be heard in a well-balanced manner. Here, the reason why the value of K is made
variable by the semi-fixed volume 16 is that the relative position of the speakers 2 and 6 against
the occupants 8.9 differs depending on the car @ VC, so that the level balance of best single
character correction is obtained. To make adjustments. By combining the embodiment shown in
FIG. 2 and the embodiment shown in FIG. 4, the above-mentioned signal is supplied to each of the
speakers 1 to 4 only when all four speakers are operated at the same time. In addition to
providing a balanced stereo effect for both the left and the right passenger in the rear seat of the
vehicle, the present invention also provides the front seat passenger 7- The effect is further
enhanced because the stereo effect is satisfactory to a certain extent, and the most effective lspeaker combination can be selected according to the seating position of one passenger.
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