JPH06296158

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DESCRIPTION JPH06296158
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
car audio system installed in a vehicle equipped with a car telephone.
[0002]
2. Description of the Related Art In the conventional example of such an on-vehicle audio device,
when the car telephone is in a call state, the volume of all the speakers in the vehicle is muted to
create an environment in which telephone calls can be made easily. It was
[0003]
However, in the above-described conventional on-vehicle audio device, all speakers are muted
regardless of the position of the car telephone in the middle of a call, so that the person other
than the talker is on the telephone call. There is a problem that information such as music from
the speaker can not be enjoyed.
[0004]
In addition, since all the speakers are muted during a call, there is also a problem that the
confidential state can not be maintained even if, for example, the caller does not want to listen to
another same passenger.
[0005]
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The present invention solves such conventional problems, and even while talking on a car
telephone, the same passengers other than the caller can enjoy information such as music from
the speaker, and An object of the present invention is to provide an excellent in-vehicle audio
device capable of maintaining a confidential state of a call.
[0006]
[Means for Solving the Problems] In order to achieve the above object, the present invention
comprises a plurality of speakers and a main unit equipped with volume adjusting means for
adjusting the volume output from the speakers. The in-vehicle audio apparatus installed,
detection means for detecting a signal radiated by a car telephone in the vehicle during a call and
generating a detection signal, and the inner car telephone of the plurality of speakers according
to the detection signal And control means for giving an instruction to mute the volume of the
near speaker to the volume adjustment means.
[0007]
According to the present invention, since the volume of the speaker closest to the car telephone
can be muted during the call of the car telephone according to the above configuration, the same
passenger who is not the talker takes information such as music from the speaker If the caller
does not want to hear the contents of the call, he or she can keep the confidential state.
[0008]
Embodiments of the present invention will be described hereinbelow with reference to the
drawings.
[0009]
FIG. 1 is a schematic block diagram of a car audio system according to an embodiment of the
present invention.
In FIG. 1, a range 1 indicated by a dotted line indicates a compartment of the vehicle.
10 is a main unit (center unit) installed in the vicinity of the driver's seat in the passenger
compartment, in which the CPU 11, which is the control means, performs predetermined signal
processing on audio signals from a sound source (not shown) It has an audio signal processing
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unit 12 that sends out a plurality of channels of output audio signals to be supplied.
The audio signal processing unit 12 is provided with volume adjusting means (not shown) for
muting the output audio signal to be sent in response to a command from the CPU 11.
[0010]
Reference numerals 20a to 20d denote four speaker units (hereinafter simply referred to as
"speakers") connected to the audio signal processing unit 12 of the main body device 10. The
speakers 20a installed on the front right of the vehicle are installed on the front left The speaker
20b is provided with a speaker 20c installed on the rear right side of the vehicle and a speaker
20d installed on the rear left side.
Hereinafter, the term "speaker 20" is used to refer to the speaker as a whole.
[0011]
Reference numeral 30 denotes a mobile telephone installed in the vehicle, which emits a signal of
light of a specific infrared pulse train when it is off-hooked.
Reference numerals 40a to 40d denote sensor light receiving units provided in the vicinity of the
speakers 20a to 20d, respectively, and detecting means for detecting an infrared signal radiated
from the car phone 30.
Hereinafter, when the sensor light receiving unit is generically referred to as the sensor light
receiving unit 40.
Also, A to D are passengers of this vehicle.
[0012]
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Note that these sensor light receiving units 40 are provided in the speaker 20, and although not
shown in FIG. However, the sensor light receiving unit of the main body device 10 also has a
function of receiving infrared light from the remote control device.
[0013]
FIG. 2 is an external perspective view of the car phone 30 in FIG. In FIG. 2, 31 is a key operation
unit for inputting a dial number, 32 is a display unit, 33 is a speaker unit, and 34 is a microphone
unit. Reference numeral 35 denotes a sensor light emitting unit, which emits infrared light in
response to the off-hook when an incoming call is received, as described above. A switch 36
emits infrared light modulated by a predetermined command code (which will be described later)
in response to pressing. FIG. 3 is a block diagram showing the internal configuration of the
mobile telephone 30 shown in FIG. In FIG. 3, blocks indicated by the same reference numerals as
those in FIG. 2 indicate the same components, and the description thereof will be omitted.
Reference numeral 37 denotes a CPU that controls the car telephone 30, and reference numeral
38 denotes a power supply unit that supplies power.
[0014]
FIG. 4 is a block diagram showing the internal configuration of the main unit 10 shown in FIG. In
FIG. 4, blocks indicated by the same reference numerals as those in FIG. 1 indicate the same
components, and the description thereof will be omitted. In FIG. 4, reference numeral 13 denotes
a sensor light receiving unit provided in the main unit 10, which can receive infrared rays from a
remote controller (not shown) and can also receive infrared rays from the above-described car
phone 30. Reference numerals 14 to 16 denote a radio, a tape mechanism, and a CD mechanism
as music information sources controlled by the CPU 11, respectively. Reference numeral 17
denotes a display unit for displaying necessary information such as an operation state under
control of the CPU 11, and reference numeral 18 denotes a key operation unit for inputting
various operation commands. A power supply unit 19 supplies power to the main unit 10.
[0015]
FIG. 5 is a front view of the speaker 20 of the 3-way system installed in the vehicle. The speaker
20 is installed at a corner portion of the vehicle compartment as shown in FIG. As shown in FIG.
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5, the speaker 20 is provided with a sensor light receiving unit 40 for receiving infrared light
emitted from a car telephone.
[0016]
FIG. 6 is a flow chart showing an outline of the operation of the audio setting in the call state of
the mobile telephone by the CPU 11 of the main unit 10.
[0017]
The CPU 11 determines whether or not the detection signal is received from the sensor light
receiving unit 13 (step S11), and when it is received, the levels of the detection signals input
from the sensor light receiving units 40a to 40d are compared (step S12).
Since each detection signal is a signal corresponding to the level of the signal radiated from car
telephone 30, by comparing the levels of the detection signals, the difference in distance between
each sensor light receiving unit 40a to 40d and car telephone 30 Will be detected.
[0018]
It is determined whether or not there is a difference between these levels (step S13). If there is a
level difference, the sensor light receiving unit for the detection signal of the maximum level is
selected (step S14). Here, among the passengers A to D, as shown in FIG. In such a case, the level
of the signal radiated from the mobile telephone 30 is highest at the sensor light receiving unit
40c. Therefore, in this case, a command to mute the volume of the speaker 20c near the position
of the selected sensor light receiving unit 40c, that is, a command to attenuate the audio signal
supplied to the speaker 20c is sent to the volume control means of the audio signal processing
unit 12. Give (step S15).
[0019]
In step S13, when there is no level difference in the detection signals from the respective sensor
light receiving units 40a to 40d, the position of the car telephone 30 is present at the center of
the compartment, so the volume of all the speakers 20a to 20d A command to mute the sound is
given to the volume adjustment means (step S16).
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[0020]
As described above, in the above embodiment, it is possible to mute the volume of the speaker
closest to the position of the car telephone 30 by determining the position of the car telephone
30 by the level difference of the signal radiated from the car telephone 30. Become.
However, even if the volume of the speaker closest to the position of the car phone 30 is muted,
it may be considered that the volume of the speaker should be further attenuated if the call
volume from the car phone 30 is small or the call content is important. Be It is also conceivable
that the infrared rays radiated from the car phone 30 are irregularly reflected in the interior of
the vehicle, and the volume of the other speakers other than the closest speaker is accidentally
muted.
[0021]
Therefore, as a countermeasure in such a case, pressing the switch 36 shown in FIG. 2 and FIG. 3
radiates the infrared light modulated by the command code which is the volume attenuation
command to the sensor light receiving unit 13 of the main unit 10 The speaker volume can be
attenuated in predetermined level units. In addition, it is possible to load in the CPU 11 by
detecting this also by the sensor light receiving unit 40 of each speaker.
[0022]
FIGS. 7 to 11 are flowcharts showing the operation of the on-vehicle acoustic device in which the
flowchart of FIG. 6 is described in more detail.
[0023]
When there is an incoming call to the car phone 30 and any one of the passengers off-hooks it,
infrared rays are radiated from the sensor light emitting unit 35 into the interior of the vehicle.
When the sensor light receiving unit 13 of the main unit (center unit) 10 receives this infrared
light, the CPU 11 detects that the sensor is on, that is, an incoming call (step S21).
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[0024]
When the sensor on is detected, the level of the analog signal photoelectrically converted by the
sensor light receiving unit 40 provided for each speaker is A / D converted into a digital signal,
and the data is stored (set data) in the memory in the CPU 11 (Steps S22 to S29). For example,
the FR sensor level obtained from the sensor light receiving unit 40a of the FR speaker 20a of
FIG. 1 is A / D converted (step S22), and the data is stored as FR data in the memory (step S23).
[0025]
Next, the level of each of these data is compared, and the speaker mode to be muted is
determined according to the comparison result (steps S30 to S70). For example, if the sensor
level from the sensor light receiving unit 40a of the FR speaker 20a is maximum, the FR speaker
20a is set to the mute mode, and if the sensor levels from the RR speaker 20c and the RL speaker
20d are equal and maximum, these two Set both rear speakers in mute mode. Also, when the
sensor levels from all the speakers are equal, all the speakers are put in mute mode.
[0026]
After the determination of the speaker mode, it is determined whether the sensor light receiving
unit 13 of the center unit 10 is on (step S71), and if it is on, the speaker mode is determined
(step S72). Then, mute on processing of the corresponding speaker is performed based on the
determination result (step S73). In this case, in place of the mute on process of the speaker, the
process of reducing the volume level of the audio signal may be performed. If the sensor of the
center unit 10 is off in step S71, the mute of the selected speaker is released (if it is muted) (step
S74). This indicates that the telephone call of the mobile telephone 30 has ended and is on-hook.
[0027]
The measurement of each sensor level need not always be performed, and the timer is set with
the measurement interval of each sensor level set to 500 ms (step S75), and it is determined
whether the timer has ended (step S76). The process proceeds to step S22. If the timer does not
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end, it is determined whether the sensor light receiving unit 13 of the center unit 10 is off (step
S77), and if it is off, the selected speaker is unmuted (step S78).
[0028]
As described above, the position of the car phone 30 is determined by receiving the infrared rays
emitted from the car phone 30 by the sensor light receiving units provided in the speakers
disposed at the respective positions in the cabin and comparing the light reception levels thereof.
Therefore, the speaker closest to the car phone 30 can be muted, and even if there is an
incoming call to the car phone, the same passenger who is not the caller can enjoy information
such as music from the speaker And the caller can keep the call confidential.
[0029]
It is also possible to adjust the volume adjustment of the speaker to a preset mute value in the
test mode and to automatically attenuate to the adjusted mute value when an incoming call is
detected.
[0030]
Also, as another embodiment, in order to determine the position of the car telephone 30,
regardless of the level difference of the signal radiated from the car telephone 30, the phase is
detected, and the position between the car telephone 30 and each speaker is detected. It is also
possible to measure the distance and mute the volume of the speaker closest to the position of
the car phone 30.
[0031]
Furthermore, a means for detecting the volume level of the speaker may be provided in the car
telephone, and radiation of infrared rays may be continued until the volume level falls below a
predetermined value.
[0032]
Furthermore, in the above embodiment, infrared rays are radiated from a car telephone, but the
position detection may be performed by radio waves such as carrier wave signals emitted by the
car telephone.
[0033]
As is apparent from the above embodiments, the present invention provides an audio apparatus
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having a plurality of speakers and a main unit for supplying audio signals to the speakers when
the car telephone is in a talking state. By determining the distance between the speaker and the
car phone and automatically muting the volume of the speaker closest to the position of the car
phone, even if the car phone is in a call, the other passengers who are not on a call are It is
possible to enjoy information such as music from the speaker, and the caller has the excellent
effect of being able to keep the conversation confidential.
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