JPH042450B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a sun visor speaker system that performs high frequency reproduction correction for a vehicle-mounted speaker system.
In particular, it attempts to optimize the reproduction of a stereo sound field according to the arrangement of passengers.

[Conventional technology]

There is an in-vehicle speaker system in which a tune-up speaker for correcting high-frequency reproduction is embedded in the sun visor above the windshield. Figure 3a is an example, where 11 is the driver's seat, 12 is the passenger seat,
21, 22 are sun visors in front of each seat, 31, 32
are R and L channel tune-up speakers embedded in the left and right sun visors. When the sound field balance of the speakers 31 and 32 is adjusted with reference to the driver's seat 11, the position of the sound image C can be localized between the speakers 31 and 32, as shown in FIG.

[Problem that the invention seeks to solve]

The above sound image balance is optimal for passenger (driver) Since the volume is extremely lower than the volume of the speaker 32, the sound image balance is not optimal, and generally, the sound image C' on the passenger seat side is localized in front of the passenger Y due to the difference in volume. For this reason, assistant Y loses the stereo feeling. On the other hand, if the sound image balance is readjusted to be optimal for assistant Y, the stereo effect will disappear on the driver's seat side. Therefore, when a total of two people, the driver and the assistant, are seated in the front seats in the vehicle interior, the only way is to equalize the volumes of the left and right speakers 31 and 32 so that both of them can enjoy an unsatisfactory balanced state. However, even if such adjustment is made, if there is only one driver, readjustment must be made to obtain the optimum sound image balance, which is extremely inconvenient.

The present invention attempts to improve this point.

[Means for solving problems]

FIG. 1 is a diagram showing the principle of the present invention, in which two tune-up speakers 31 and 33 are provided on the right and left of the sun visor 21 on the driver's seat 11 side, and two tune-up speakers 31 and 33 are provided on the right and left of the sun visor 22 on the passenger seat 12 side. It is equipped with up-up speakers 32 and 34. Compared with FIG. 3, the right sun visor 21 has a speaker 33 added to the left side, and the left sun visor 22 has a speaker 34 added to the right side. When only driver X is present, the speaker 33 is used in the R channel like the speaker 31, and in this case the speaker 34 is used in the L channel like the speaker 32. On the other hand, when driver X and assistant Y are on board, the speakers 31 and 34 are
The speakers 32 and 33 are used for the L channel.

[Effect]

When the speaker switching described above is performed, if there is only one driver, the speaker 3 of the right sun visor 21
1 and 33 are both used for R channel reproduction,
Also, the speakers 32 and 34 of the left sun visor 22
Both are used for L channel reproduction. Therefore, by adjusting the left and right volume balance using the balance control, it is possible to localize the sound image A, which provides a stereophonic effect for the driver X, near the middle of the sun visors 21 and 22.

On the other hand, when the driver X and the assistant Y get on board, the speaker systems of the sun visors 21 and 22 are made independent, and the two sound images B and C are localized in front of each person. That is, the right speaker 31 of the sun visor 21 reproduces the R channel, while the left speaker 33 reproduces the L channel to localize the sound image B with a stereo effect in front of the driver X. Furthermore, the left speaker 32 of the sun visor 22 reproduces the L channel, while the right speaker 34 reproduces the R channel, creating a stereophonic sound image C in front of the assistant Y.
localize.

In this case, the volumes of the speakers 31 and 33 are equal, and the volumes of the speakers 32 and 34 are equal. In this way, by switching the speaker system as described above, it is possible to obtain the optimal sound image balance for each person, whether there is a single driver or a driver and two assistants.

〔Example〕

FIG. 2 is an embodiment of the present invention, showing a speaker switching circuit configuration (built into a sun visor). In the figure, S ₁ to _{S 6} are two-contact type switches (other types may be used) that switch in conjunction with each other, and S ₁ and S ₂ are on the right,
For distributing the output of the left power amplifiers 41 and 42,
_S3 to _S6 are for speaker input switching within each sun visor. In the illustrated circuit state, the L channel signal is supplied to the speakers 32, 34 of the sun visor 22 through switches S ₂ , S ₃ , and S ₄ , and the R channel signal is supplied to the right speaker through switches S ₁ , S ₅ , and S ₆ . 21 speakers 31 and 33. This is the case when sound image A is formed in FIG. 1b. In this case, balance adjustment is done by power amplifier 4.
This was done before 1.42.

On the other hand, if all the switches S ₁ to _{S 6} are switched to the opposite state from that shown in the figure, the L channel signal is sent to the speaker 32 through the switches S ₂ and S ₃ , and to the speaker 32 through the switches S 2 and S 3.
It is supplied to the speaker 33 through S ₂ and S ₅ . On the other hand, the R channel signal is supplied to the speaker 34 through switches S ₁ and S ₄ and to the speaker 31 through switches S ₁ and S ₆ . As a result, two sound images B and C are formed as shown in FIG. 1b.

Prior to this switching, if the balance has been adjusted so that sound image A is formed in the switch state shown in Figure 2, sound images B and C both have a stereo feel, but there is a difference in volume (sound pressure). B side is larger). If this point is a particular problem, the balance control circuit (not shown) should also be of a switching type, and when forming sound images B and C, it should be switched in conjunction so that the output levels of the power amplifiers 41 and 42 are equal. That's fine.
In addition, the switches S ₁ to _{S 6} may be operated manually, but it is also possible to provide a seating sensor in each of the driver's seat 11 and the passenger seat 12 (only the passenger seat 12 side may be used), and determine the seating situation from the sensor output. It is also possible to switch automatically. For example, while the seating sensor on the passenger seat 12 side is off, switches S ₁ to S ₆ are set to
The state shown in the figure is maintained, and when the sensor is turned on, the switches S ₁ to S ₆ are switched to the side opposite to that shown in the figure.

Also, in the above explanation, even if there is only driver
All of the speakers 31 to 34 are used, but one each is used for the right and left sun visors 21 and 22.
It is also possible to use one speaker at a time (the remaining speakers are not used). However, the load on the amplifiers 41 and 42 is significantly different between when two speakers are connected in parallel (if the impedance of one speaker is 8Ω, two speakers in parallel are 4Ω) and when only one speaker is connected (8Ω). Since it fluctuates, it is necessary to either enjoy the fluctuation (sound pressure changes) or to avoid it by connecting a dummy (8Ω) in parallel (even if you do this, the volume will decrease).
There is no advantage to using each speaker.

〔Effect of the invention〕

As described above, according to the present invention, a tune-up speaker pair is built into each of the left and right sun visors, and two speakers in each speaker pair are used in a single sound image mode in which each speaker pair is set and one channel is reproduced. Since it is possible to switch to a multi-tone image mode in which both channels are played separately, it has the advantage of providing the optimal stereo feeling for each person, whether it is the driver alone or the driver and assistant are seated. .

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram 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 diagram of a conventional sun visor speaker system. In the diagram, 11 is the driver's seat, 12 is the passenger seat, 21, 2
2 is a sun visor, 31 to 34 are tune-up speakers, 41 and 42 are power amplifiers, A, B, and C.
is a sound image, and S ₁ to S ₆ are changeover switches.

Claims (1)

[Claims] 1 A pair of tune-up speakers is installed in each sun visor in front of the driver's seat and front passenger seat, and a single sound image mode in which each speaker pair is grouped together and plays one channel at a time, and two speakers in each speaker pair play one channel each. A sun visor speaker system characterized by comprising a circuit for switching between a multitone image mode and a multitone image mode.