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JPS61184143

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DESCRIPTION JPS61184143
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
sun visor speaker system for performing high-frequency reproduction correction of a carmounted speaker system, and more particularly to optimize reproduction of a stereo sound field
according to the arrangement of occupants. 2. Description of the Related Art There is a system in
which a tune-up speaker for high-frequency reproduction correction is embedded in a sun visor
above the windshield in a car-mounted speaker system. Fig. 3 (a) is the example-11 is the driver's
seat, 12 is the passenger seat, 21.22 is the sun visor in front of each seat, 31.32 is the right and
left sun visor embedded in R and L channels It is a tune amplifier speaker. If the sound field
balance of the speaker 31.32 is adjusted with reference to the driver's seat 1, the position of the
sound image C can be localized in the middle of the speaker 31.32 as shown in FIG. [Problems to
be Solved by the Invention] The above-mentioned sound image balance is optimum for the
occupant (driver) X seated in the driver's seat 11, but for the occupant (assistant) Y seated in the
passenger seat 12, the right side Since the volume from the speaker 31 is extremely smaller than
the volume of the left speaker 32, the sound image balance is not optimum, and the sound image
C 'on the passenger seat side is generally localized in front of the assistant Y due to the volume
difference. For this reason, the assistant Y loses a sense of stereo. On the other hand, if the
assistant Y is adjusted so as to obtain a proper sound image balance, the sense of stereo
disappears on the driver's seat side. Therefore, when a total of two drivers and assistants are
seated in the front seat in the vehicle interior, the volume of the left and right speakers 31. 32
can not be equalized to enjoy an insufficient balance state. However, even if such adjustment is
made, it will be extremely inconvenient if it becomes only one driver and readjustment must be
made to obtain an optimum sound image balance. The present invention seeks to improve this
point. [Means for Solving the Problems] FIG. 1 is a principle diagram of the present invention, in
which two tune-up speakers 31.33 are provided on the right and left of the sun visor 21 of 11
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examples of the driver's seat. 22 also has two chain-up speakers 32. 34 on the right and left.
Compared with FIG. 3, the speaker 33 is added to the left side of the sun visor 21 on the right
side, and the speaker 34 is added to the right side on the left side of the sun visor 22. The
speaker 33 is used in the R channel in the same manner as the speaker 31 in the case of the
driver X alone, and at this time, the speaker 34 is used in the L channel in the same manner as
the speaker 32. On the other hand, when the driver X and the assistant Y get on the vehicle, the
speakers 31. 34 are used for the R channel, and the speakers 32. 33 for the L channel.
[Operation] When the above speaker switching is performed, in the case of only one driver, the
speakers 31 ° 33 of the sun visor 21 on the right side are all used for R channel reproduction,
and the speakers 32. 34 of the sun visor 22 on the left side are all If used for channel playback.
Therefore, by adjusting the volume balance between the left and right by balance control, it is
possible to localize the sound image A, which gives the driver X a stereo feeling, in the middle of
the sun visor 21 and 22. On the other hand, when the driver X and the assistant Y get on the
vehicle, the speaker system of the sun visor 21.22 is made independent and the two sound
images B and C are localized in front of each person. That is, the right side speaker 31 of the sun
visor 21 reproduces the R channel, but the left side speaker 33 reproduces the L channel to
localize the sound image B having a stereo feeling in front of the driver X. The left speaker 32 of
the sun visor 22 reproduces the L channel, but the right speaker 34 regenerates the R channel to
localize the sound image C having a stereo feeling in front of the assistant Y. In this case, in terms
of volume, the speakers 31 and 33 are equal, and the speakers 32 and 34 are equal. In this way,
it is possible to obtain an optimal sound image balance for each driver, even in the case of one
driver and in the case of two drivers and assistants, by switching the speaker system described
above. FIG. 2 shows an embodiment of the present invention, which is a circuit diagram of
speaker switching (built in a sun visor). In the figure, S + = Ss is a two-contact switch (other types
may be used) switched in conjunction, 31.32 is for the distribution of the output of the right and
left power amplifiers 41.42, and 83 to S6. Is for switching the speaker input in each sun visor. In
the illustrated circuit state, the L channel signal is switch S2. S3. The signal is supplied to the
speaker 32.34 of the sun visor 22 through Sa, and the signal of the R channel is a switch S1, S5.
It is supplied to the speakers 31 and 33 of the right speaker 21 through S6. This is the case
where the sound image A is formed in FIG. 1 (b). The balance adjustment in this case is
performed before the power amplifier 41.42. On the other hand, when all the switches 31 to S6
are switched to the opposite state to that shown, the L channel signal is switched to the switch
S2. Switch 32 to the speaker 32 through S3. It is supplied to the speaker 33 through Ss. On the
other hand, the R channel signal is switch S +. Switch 34 to S34 through S4.
It is supplied to the speaker 31 through Sa. As a result, two sound images B and C are formed as
shown in FIG. Prior to this switching, when the balance is adjusted so that the sound image A is
formed in the switch state of FIG. 2, the sound images B and C both have a sense of stereo but
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there is a difference in volume (sound pressure) B side is large). In particular, the balance control
circuit (not shown) is also switched when this point is a problem, and when the sound images B
and C are formed, interlocked switching is performed so that the output levels of the power
amplifier 41. 42 become equal. Just do it. Although switches 81 to S6 may be operated manually,
seating sensors are provided on driver's seat 11 and passenger's seat 12 (only on the side of
passenger's seat 12 may be provided), and the seating condition is judged from the sensor output
to automatically It can also be switched in the same manner. For example, while the seating
sensors of the 12 front passenger seats are off, the switch 5I-36 is in the state of FIG. 2 and the
switches S1 to Ss are switched to the opposite side to those shown in FIG. . In the above
description, all four speakers 31 to 34 are used even in the case of only the driver X, but one
speaker is used for each of the left and right sun visors 21 and 22 (the remaining speakers are It
is also conceivable to do not use it. However, when the load of the amplifier 41.42 is two parallel
connected (if the impedance of one speaker is 8Ω, two parallel 4Ω) and only one single (8Ω)
Because it fluctuates, it is necessary to connect dummy (8 Ω) in parallel (even if the volume is
lowered) in order to enjoy the fluctuation (the sound pressure changes) or to avoid it, one by one
There is no advantage to using a speaker. [Effects of the Invention] As described above, according
to the present invention, a single sound image mode in which a pair of tune-up speakers are built
in each of the left and right sun visors, and each speaker pair is reproduced one by one as a pair,
and each speaker pair Since it is possible to switch to a multitone image mode in which both
channels are divided and reproduced by two speakers, even in the case of a driver alone, even
when the driver and the assistant are seated, an optimal stereo feeling for each person is
obtained. Have the advantage of
[0002]
Brief description of the drawings
[0003]
FIG. 1 is an explanatory view of the principle of the present invention, FIG. 2 is a circuit diagram
showing an embodiment of the present invention, and FIG. 3 is an explanatory view of a
conventional sun visor speaker system.
In the figure, 11 is a driver's seat, 12 is a passenger seat, 21 and 22 is a sun visor, 31 to 34 are
tune-up speakers, 41.42 is a power amplifier, A, B and C are sound images, and S + to S6 are
changeover switches. . Applicant: Fujitsu Ten Ltd. Attorney Attorney Atsushi Aoyan Figure 2
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