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JP2005223505

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DESCRIPTION JP2005223505
PROBLEM TO BE SOLVED: To provide an on-vehicle acoustic reproducing device capable of
effectively separating a sound to the rear seat side and a sound to the front seat side when
different sounds are reproduced in a vehicle compartment. SOLUTION: In a car-mounted audio
reproduction apparatus including a sound source A, a sound source B, ..., a sound source X, front
seat side speakers 14FL and 14FR and rear seat side speakers 14RL and 14RR, a microcomputer
16 outputs to the rear seat side The sound source condition of the sound to be output is different
from the sound source of the sound to be output to the front seat side, and another sound source
state is detected, and another sound source state is detected. Control to change directivity.
Specifically, the direction of the front seat speaker and / or the rear seat speaker is changed.
Alternatively, the rear seat dedicated speaker is exposed and driven toward the rear seat.
[Selected figure] Figure 3
Automotive sound reproduction device
[0001]
The present invention relates to an on-vehicle acoustic reproduction device that includes a
plurality of sound sources and a plurality of speakers and simultaneously reproduces different
sounds in a vehicle compartment.
[0002]
In recent years, in a vehicle, an on-vehicle sound reproducing apparatus (car audio apparatus)
mounted on an instrument panel is freely operated even from the rear seat side, and a voice
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different from a voice heard on the front seat side is It has become possible to listen to the music
(for example, see Patent Document 1 below).
Furthermore, it is also becoming possible to enjoy video from a television (TV), DVD, etc. on the
rear seat side.
[0003]
Thus, as shown in FIG. 1, the first type of on-vehicle acoustic playback device that enables unique
audio listening on the rear seat side is a front speaker (front And a rear speaker (rear seat side
speaker) disposed near the rear seat to output voices from different sound source signals. In this
case, since the passenger in the rear seat can also hear the sound from the front speaker, there is
a problem that the mixing of the sound makes it difficult to hear the sound of the rear speaker.
[0004]
In addition, the second type of on-vehicle audio reproduction device that enables unique audio
listening on the rear seat side is, as shown in FIG. 2, an output of audio from the same sound
source signal from the front speaker and the rear speaker. The rear seat side is made to output
the sound by the different sound source signals from the headphones. In this case, there is a
problem that the rear seat occupants have to wear headphones one by one.
[0005]
Japanese Patent Laid-Open No. 2002-75284
[0006]
The present invention has been made in view of the above-mentioned problems, and its object is
to emit the sound to be emitted to the rear seat side and the front seat side when different
sounds are reproduced in the vehicle compartment An object of the present invention is to
provide an on-vehicle acoustic reproduction device capable of effectively separating it from a tobe-sound.
[0007]
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2
In order to achieve the above object, according to a first aspect of the present invention, there is
provided an on-vehicle acoustic reproducing device comprising a plurality of sound sources and
a plurality of speakers and capable of simultaneously outputting the plurality of sound sources
from the plurality of speakers. Detection means for detecting a different sound source state in
which the sound source of the sound to be output to the rear seat side is different from the sound
source of the sound to be output to the front seat side; There is provided a vehicle-mounted
audio reproduction apparatus comprising: control means for performing control to change the
directivity of sound radiated from the plurality of speakers.
[0008]
Further, according to a second aspect of the present invention, in the on-vehicle acoustic
reproduction device according to the first aspect of the present invention, the detection means
detects the different sound source state based on the operation state of the sound source
selection circuit. .
[0009]
Further, according to the third aspect of the present invention, in the on-vehicle acoustic
reproduction device according to the first aspect of the present invention, the detection means
determines the different sound source state based on the power on state of the rear seat display.
To detect
[0010]
Further, according to a fourth aspect of the present invention, in the on-vehicle acoustic
reproduction device according to the first aspect of the present invention, the control means
controls the front seat speaker and / or the front seat side speaker when the other sound source
state is detected. Or change the direction of the rear seat speaker.
[0011]
Further, according to a fifth aspect of the present invention, in the on-vehicle acoustic
reproduction device according to the first aspect of the present invention, the control means is
directed toward the rear seat when the different sound source state is detected. The seat
dedicated speaker is exposed and driven.
[0012]
In the vehicle-mounted audio reproduction apparatus according to the present invention, the
above-described configuration is effective when the different sounds are reproduced in the
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vehicle compartment, the sound to be emitted to the rear seat side and the sound to be emitted to
the front seat side Separated.
[0013]
Hereinafter, embodiments of the present invention will be described with reference to the
accompanying drawings.
[0014]
FIG. 3 is a block diagram showing the configuration of an embodiment of a vehicle-mounted
sound reproduction device according to the present invention.
In the figure, each of a sound source A, a sound source B,..., A sound source X is an AM tuner, an
FM tuner, a broadcast receiver such as a TV tuner or a recording medium playback device such
as a cassette deck, a CD player, a DVD player.
Audio signals from the respective sound sources are led to a front seat side source selector 10F
and a rear seat side source selector 10R as a sound source selection circuit.
[0015]
Each of source selectors 10F and 10R selects an audio signal from one sound source based on a
control signal from microcomputer 16.
Next, the front seat side power amplifier 12F and the rear seat side power amplifier 12R amplify
the power of the selected front seat side and rear seat side audio signals.
The front seat side left speaker 14FL and the front seat side right speaker 14FR convert the
power-amplified front seat side audio signal into a sound wave and radiate it.
Similarly, the rear left speaker 14RL and the rear right speaker 14RR convert the power-
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amplified rear audio signal into a sound wave and emit the sound wave.
[0016]
A drive unit 18F is provided for driving the front speakers 14FL and 14FR under the control of
the microcomputer 16 so that the front speakers 14FL and 14FR can change the direction to the
left or right.
Similarly, the rear seat side speakers 14RL and 14RR are provided with a drive unit 18R under
the control of the microcomputer 16 to drive them so that they can change the direction to the
left and right.
[0017]
The microcomputer 16 detects whether it is in the normal mode or another sound source mode.
Here, the normal mode means that the sound source of the sound to be output to the rear seat
side is the same as the sound source of the sound to be output to the front seat side, and the
separate sound source mode is output to the rear seat side It means that the sound source of the
sound to be played is different from the sound source of the sound to be outputted to the front
seat side.
[0018]
Specifically, when the source selectors 10F and 10R both select the same sound source, the
microcomputer 16 recognizes that it is in the normal mode, while when the source selectors 10F
and 10R select different sound sources, the microcomputer 16 separately Recognize that you are
in sound source mode.
[0019]
Alternatively, the microcomputer 16 recognizes that the rear seat display is in the different
sound source mode when the rear seat display is powered on when the rear seat TV apparatus is
attached, but the power is not switched on. It is also possible to recognize when in the normal
mode.
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[0020]
In the normal mode, the front seat speakers 14FL and 14FR and the rear seat speakers 14RL and
14RR are directed substantially perpendicularly to the side of the vehicle, as shown in FIG.
However, when it is detected that the microcomputer 16 has shifted to another sound source
mode, as shown in FIG. 5, the front seat side speakers 14FL and 14FR are located on the front
side of the vehicle and the rear seat side speakers 14RL and 14RR. The drive units 18F and 18R
are controlled so as to change the direction to the rear side of the vehicle.
[0021]
Thus, even if different sounds are emitted from the front seat side speakers 14FL and 14FR and
the rear seat side speakers 14RL and 14RR, they are prevented from being mixed and hard to
hear.
In addition, a certain effect is acquired only by changing the direction about only one of a front
seat side speaker or a rear seat side speaker.
[0022]
Alternatively, when a transition from the normal mode to another sound source mode is detected,
the microcomputer 16 exposes and drives the rear seat dedicated speaker toward the rear seat.
That is, in the normal mode, the front seat side speakers 14FL and 14FR and the rear seat side
speakers 14RL and 14RR emit the same sound in the state shown in FIGS. 6 (A) and 6 (B).
[0023]
However, when transitioning to another sound source mode, as shown in FIGS. 7A and 7B, the
rear seat dedicated speaker 14RS is exposed, and the sound to be emitted from the rear seat side
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speakers 14RL and 14RR is the rear seat. The control by the microcomputer 16 is executed so
that the radiation from the dedicated speakers 14RS and the radiation from the rear seats 14RL
and 14RR are stopped.
[0024]
The rear seat dedicated speaker 14RS may be exposed to any of a ceiling, a rear door, a seat, a
rear side trim, a back door, etc. as long as directivity of sound to the rear seat can be secured.
[0025]
Thus, even if different sounds are emitted from the front seat side speakers 14FL and 14FR and
the rear seat dedicated speaker 14RS, they will not be mixed and difficult to hear.
[0026]
It is a block diagram which shows one structural example of the conventional vehicle-mounted
sound reproduction apparatus.
It is a block diagram which shows the other structural example of the conventional vehiclemounted sound reproduction apparatus.
FIG. 1 is a block diagram showing a configuration of an embodiment of a vehicle-mounted audio
reproduction device according to the present invention.
It is a top view which shows the operation state of the normal mode in one Embodiment of this
invention.
It is a top view which shows the operation state of another sound source mode in one
embodiment of the present invention. It is a figure which shows the operation state of the normal
mode in other embodiment of this invention, Comprising: (A) is a side view, (B) is a top view. It is
a figure which shows the operation state of another sound source mode in other embodiment of
this invention, Comprising: (A) is a side view, (B) is a top view.
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Explanation of sign
[0027]
10F: Front seat side source selector 10R: Rear seat side source selector 12F: Front seat side
power amplifier 12R: Rear seat side power amplifier 14FL ... Front seat side left speaker 14FR ...
Front seat side right speaker 14RL ... Rear seat side left speaker 14RR ... Rear seat side right
speaker 14RS ... Rear seat dedicated speaker 16 ... Microcomputer 18F ... Front seat side speaker
drive unit 18R ... Rear seat side speaker drive unit
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