JP2006186925

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DESCRIPTION JP2006186925
PROBLEM TO BE SOLVED: To provide an on-vehicle center speaker which enables hands-free
calling and does not bring discomfort on the appearance. SOLUTION: The center speaker 1
incorporates a communication module (Bluetooth module 30) for exchanging signals with an
external device by a wireless method, and also incorporates a microphone 6. The microphone 6
is installed at a substantially central position of the dashboard 5 of the car, and as a result, the
directivity to the driver's seat and the passenger's seat is improved. [Selected figure] Figure 1
Car center speaker
[0001]
The present invention relates to a novel on-vehicle center speaker for realizing so-called handsfree communication and the like in an automobile.
[0002]
For example, for the purpose of further improving the usability of the mobile phone, it is desired
to realize a so-called hands-free type mobile phone.
In particular, in automobiles, the use of mobile phones is greatly restricted, and hands-free
calling is necessary even in consideration of safety and the like.
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[0003]
Under such circumstances, hands-free kits for using a mobile phone in a car are commercially
available, but both require a microphone and a speaker to be connected to the mobile phone by a
connection cord, and the connection is troublesome. At the same time, there is a disadvantage
that the connecting cords get in the way in the car.
[0004]
Therefore, the applicant of the present invention has proposed a Bluetooth voice communication
apparatus for a car that enables wireless hands-free use of a mobile phone in a car (see Patent
Document 1).
This Bluetooth audio communication device for a car incorporates a Bluetooth module, a speaker,
and a microphone in a housing equipped with a cigarette lighter plug part, and the cigarette
lighter plug part is inserted into a cigarette lighter socket of a car to carry a Bluetooth-equipped
mobile phone. The wireless network with the telephone is established, and the received sound of
the mobile phone is amplified from the speaker, and the transmitted sound is transmitted to the
mobile phone through the microphone. JP 2004-72259 A
[0005]
However, in the case of the in-vehicle voice communication device described in Patent Document
1, the cigarette lighter socket is closed, and when it is inserted into the cigarette lighter socket,
there is a sense of discomfort in appearance.
[0006]
The present invention has been proposed for the purpose of solving the drawbacks of such
conventional ones, and it is an object of the present invention to realize hands-free
communication by using a center speaker for surround.
That is, the object of the present invention is to provide an on-vehicle center speaker that not
only functions as a center speaker for surround sound in sound reproduction, but also enables
hands-free calling and does not cause any sense of discomfort in appearance.
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[0007]
In order to achieve the above-mentioned object, the on-vehicle center speaker of the present
invention is characterized in that it incorporates a communication module for transmitting and
receiving signals to and from an external device by a wireless method and also incorporates a
microphone.
[0008]
A so-called surround system has become widespread as an on-vehicle audio device, and a
surround speaker has come to be used.
And in a surround system, a center speaker is installed corresponding to a center channel. In a
car-mounted surround system, a center speaker is often installed on a dashboard in a car.
[0009]
On the other hand, various hands-free kits etc. are commercially available to realize hands-free
calling in a car, but all will have microphones and speakers installed separately from the audio
system, which may cause discomfort etc. in appearance The cause of
[0010]
In the present invention, as the speaker in the hands-free call, the microphone is incorporated in
the center speaker as well as the center speaker.
Therefore, it is not necessary to separately install a speaker or a microphone for hands-free
communication, and the sense of incongruity or the like on the appearance is eliminated. Further,
since the center speaker is installed at the center of a dashboard in a car, if a microphone is
installed here, the directivity to the driver's seat and the front passenger seat can be sufficiently
secured.
[0011]
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According to the present invention, since hands-free calling can be performed wirelessly in a car,
the trouble of connecting the connection cord is eliminated, and the connection cord does not get
in the way in the car. In addition, since the microphone is built in the center speaker for audio
reproduction, it is not necessary to separately install a microphone and a speaker for hands-free
communication, and it is possible to eliminate an uncomfortable feeling on the appearance and
the like.
[0012]
Hereinafter, an on-vehicle center speaker to which the present invention is applied will be
described in detail with reference to the drawings.
[0013]
FIG. 1 shows the installation of the center speaker in a car.
The center speaker 1 incorporates a speaker 2 for expanding music, voice and the like, and is
installed on a dashboard 5 in a car provided with a steering wheel 3 and various meters 4.
[0014]
For example, in the case of a 5.1ch surround system, in addition to the left and right speakers, a
rear speaker, a center speaker, etc. are installed, and the center speaker 1 functions as a center
speaker of the 5.1ch surround system.
[0015]
Usually, the center speaker 1 is only used for sound field reproduction in the surround system,
and has only a function as a speaker.
On the other hand, the center speaker 1 of the present invention has a voice communication
function for hands-free calling, and in order to realize this, the microphone 6 and the wireless
communication means (not shown) are provided. ) Is built-in.
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[0016]
The center speaker 1 is installed at a central position of the dashboard 5, that is, at a position
between the driver's seat and the front passenger's seat with the speaker 2 facing the driver.
Therefore, if the microphone 6 is installed on the installation surface of the speaker 2, it faces the
driver or the passenger in the front passenger seat. Therefore, the directivity of the microphone
6 to the driver's seat and the passenger's seat is improved.
[0017]
Furthermore, in the center speaker 1, a Bluetooth module (not shown), which is a communication
module for exchanging signals with an external device (such as a portable telephone) by a
wireless method. ) Is built-in. Bluetooth is a standard for performing two-way communication by
wirelessly connecting various devices such as computers, mobile phones, home appliances, and
in-vehicle electronic devices using a 2.4 GHz frequency band, and a host that performs
communication control One to seven slaves are wirelessly connected to this, and packet-based
data communication and real-time voice communication can be performed. Specification version
as of 2001 Ver. In 1.1, the downlink data transmission rate is 721 kbps and the uplink is 57.6
kbps (maximum), and three voice channels of 64 kbps are additionally provided.
[0018]
FIG. 2 shows a configuration example of a car-mounted surround system. In addition to the
center speaker 1, the left and right front speakers 12 and 13, the woofer 14 and the rear
speakers 15 and 16 are connected to the in-vehicle audio device 11, and sound field
reproduction by the 5.1 ch surround system is performed. Here, the in-vehicle audio device 11 is
connected to the center speaker 1 and the signal thereof is input. In addition, a signal from the
Bluetooth module 30 is also input. For example, in the call mode, the input mode is switched ,
The call voice of the mobile phone is played back.
[0019]
FIG. 3 is a block diagram showing the configuration of the voice communication unit for realizing
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hands-free calling in the center speaker 1. As described above, in addition to the speaker 2, the
Bluetooth module 30 is built in the center speaker 1, and the microphone 6 is attached. Here, the
Bluetooth module 30 includes a microcomputer 31, a receiving unit 32, a transmitting unit 33,
and a selector 34 that switches antenna connection between the receiving unit 32 and the
transmitting unit 33. The audio signal output from the microphone 6 is converted to digital form
by the A / D converter 35 and input to the microcomputer 31. The digital audio signal output
from the microcomputer 31 is converted to analog from the D / A converter 36 to the speaker 2
It is output.
[0020]
If the center speaker 1 having the above configuration is installed on the dashboard 4 of a car,
the driver or the passenger on the front passenger seat talks hands-free via the mobile phone
without being aware of the microphone 6 be able to. Since the microphone 6 is built in the center
speaker 1, there is no sense of discomfort in appearance. In addition, when not talking, this can
be used as a center speaker of the 5.1ch surround system to enjoy sound field reproduction.
[0021]
It is a schematic perspective view which shows the installation state of the vehicle-mounted
center speaker to which this invention is applied. It is a schematic diagram which shows
schematic structure of a 5.1ch surround system. It is a block diagram which shows the structure
of the audio ¦ voice communication part for handsfree calling.
Explanation of sign
[0022]
Reference Signs List 1 center speaker 2 speaker 3 handle 4 meter 5 dashboard 6 microphone 30
Bluetooth module 31 microcomputer 32 reception unit 33 transmission unit 34 selector 35 A / D
converter 36 D / A converter
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