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JPH1066189

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
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DESCRIPTION JPH1066189
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
vehicle audio system comprising at least two amplifier channels each providing an output signal
capable of driving a loudspeaker in response to a signal from a signal source.
[0002]
2. Description of the Related Art Such an audio device is known from Japanese Patent
Application Laid-Open No. 4-270539. This known device comprises an amplifier unit capable of
driving four loudspeakers. The amplifier unit is arranged to selectively receive an output signal
from a tuner, a magnetic tape cassette device or a CD player. A telephone unit is provided which
comprises a hands-free microphone, which is generally installed on the driver's side of the
vehicle. In order to reproduce the audio signal received by the telephone module during a call,
one of the four loudspeakers of the vehicle is disconnected from the amplifier unit and used as a
telephone loudspeaker.
[0003]
SUMMARY OF THE INVENTION According to such an audio device, the center of acoustic
balance during a call depends on the mounting position of the selected loudspeaker.
Furthermore, the loudness of this loudspeaker can not be changed during the call.
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[0004]
The object of the present invention is to provide an audio device of the type defined in the
introduction, in which the acoustic balance center in a call can be adjusted in a flexible manner.
[0005]
SUMMARY OF THE INVENTION According to the invention, this object is achieved by the audio
device being an audio signal from at least one first signal source or an audio signal from a second
signal source, in particular a telephone unit. To enable the gain factor of the amplifier channel to
be adjusted separately, and the audio device to switch the gain factor of the amplifier channel in
response to the signal source driving the audio device. Achieved by configuring.
[0006]
As the first signal source, for example, a magnetic tape cassette device, a tuner or a CD player can
be considered.
The gain factor of the amplifier channel can be separately set by the control element of the
control unit by the user during operation of the first signal source.
Here, if the telephone unit receives a call or the user wishes to make a call, the second signal
source drives the audio device with the audio signal of the telephone unit. The switching of the
signal source driving the audio device can be performed by the user, for example, if he wants to
make a call, or, for example, if a call comes or the connection is successful, an automatic signal
source switching It can be done soon.
[0007]
The telephone unit generally comprises a hands-free microphone, which is usually located on the
driver's side of the left hand. The acoustic balance center is sufficient from the hands-free
microphone to prevent acoustic feedback between an audio signal generated by a driver
reproduced by the loudspeaker and an audio signal received by the telephone unit It is desirable
to ensure that it is located far away. Thus, when driven by the second signal source, the audio
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2
device preferably provides a gain factor of the amplifier channel such that the acoustic balance
center of the loudspeaker is sufficiently far from the hands-free microphone To fit. However, as
the development of feedback filters has progressed, it is also conceivable to avoid feedback by
means of such feedback filters. At this time, the acoustic balance center in the call can be shifted,
for example, to the driver side so that the passenger is not unnecessarily disturbed by the call.
The gain factor of the separately adjustable amplifier channel allows the acoustic balance center
in a call to be selected separately and flexibly, and thus adapted, for example, to the type of
vehicle and the individual sense of the user It can be done. The playback volume of the audio
signal received by the telephone unit can also be adjusted separately.
[0008]
An advantageous embodiment of the invention is that the audio device shifts the four
loudspeakers by appropriately adjusting the gain balance to the acoustic balance center of these
loudspeakers at an optimum position inside the vehicle. It is characterized in that it comprises at
least four amplifier channels which are driven to be capable.
[0009]
It is a common practice today to carry two loudspeakers in front of the interior of the vehicle,
two loudspeakers in the rear, one in the left and one in the right in each case.
These four loudspeakers can be driven separately by the four amplifier channels of the audio
device, whereby the amplifier balance center of the loudspeakers can be adapted to any position
inside the vehicle. You can move by setting to. If the audio device is driven by an audio signal
from the first signal source, the user can adjust the acoustic balance center by means of a
suitable control unit to suit his personal preferences and needs. . Preferably, when the driver of
the vehicle is alone, the acoustic balance center is adjusted to the driver position on the front left
side. When there are four passengers in the vehicle, the user preferably sets the acoustic balance
center at the center of the interior of the vehicle. Here, if the driver or user wants to make a call,
or if the telephone unit receives a call, the audio device is driven by the telephone unit and the
gain factor of the amplifier channel is changed, the acoustic balance center Move. Now that the
four loudspeakers can be used for the reproduction of the audio signal received by the telephone
unit, the acoustic balance center during a call can be moved to any position inside the vehicle. In
general, this acoustic balance center will be different from the acoustic balance center selected
by the user during operation of said first signal source. The gain factor of the amplifier channel
when driven by the second signal source may be adjusted to avoid acoustic feedback as
described above. The acoustic balance center can be individually adjusted with respect to the
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user's request and the acoustic characteristics inside the vehicle since the acoustic balance center
in a call can be moved to any position inside the vehicle. Can.
[0010]
Another advantageous embodiment of the invention provides that the gain factor of the amplifier
channel is continuously shifted along an essentially linear path of the acoustic balance center of
the loudspeaker for a predetermined period of time , And is configured to be changed
continuously.
[0011]
By continuously changing the gain factor during a predetermined time period, a non-abrupt,
comfortable and smooth transition between each position of the acoustic balance center is
obtained.
The time period during which the gain factor is varied can be adapted separately to the user's
requirements and to the acoustic characteristics of the interior of the vehicle.
[0012]
Another advantageous embodiment of the invention relates to the gain factor of the amplifier
channel when driven by the second signal source such that the acoustic balance center of the
loudspeaker is located at the same passenger position of the front seat. It is characterized in that
it is configured to adjust.
[0013]
The hands-free microphone of the telephone unit is generally located on the left hand side of the
vehicle near the driver.
In order to avoid the acoustic feedback mentioned above, it is preferable to move the acoustic
balance center of the loudspeaker during a call to the passenger side of the front seat.
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[0014]
Another advantageous embodiment of the invention is characterized in that when driven by the
second signal source, the gain factor which the audio device changes can be adjusted by the
software program by the user. Do.
[0015]
Preferably, the gain factor of the amplifier channel of the audio device when driven by the first
signal source is adjustable by the control unit by the user during operation.
This allows the user to adapt the acoustic balance center of the vehicle's loudspeakers to the
needs of each of the driver and, if any, passengers. Here, when the driver wants to make a call or
receives a telephone call, the driver needs to adjust the gain factor of the amplifier channel
during each call so that acoustic feedback does not occur during the call. It is desirable that there
is no Instead, during a call, it is desirable for the acoustic balance center of the loudspeaker to
move automatically to a certain preset point inside the vehicle. This is possible, for example, by
means of an EEPROM. If the audio device, together with the associated loudspeakers, is
incorporated into a vehicle of a given type, the optimum acoustic balance center of the
loudspeakers during a call can be determined and programmed into the EEPROM. This makes it
possible to optimize the acoustic balance center for any vehicle type. Furthermore, in the audio
device, the associated control unit allows the user to adjust the gain factor of the amplifier
channel separately, thus adjusting the acoustic balance center of the loudspeaker in operation by
the telephone unit. Run a software program that can Once the gain factor of the amplifier
channel is set during operation of the telephone unit, the audio device, when driven by the
telephone unit, automatically changes these gain factors to ensure calls without acoustic
feedback Be done.
[0016]
Another advantageous embodiment of the invention is characterized in that the audio device is
arranged to automatically change the frequency response of the amplifier channel in response to
the signal source driving the audio device.
[0017]
In this way it is possible, for example, to lower the bass during a call and to adapt the frequency
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response of the amplifier channel to the user's personal preferences.
The user presets, for example, the frequency response of the gain factor during a call by means
of a software program.
[0018]
DESCRIPTION OF THE PREFERRED EMBODIMENT The schematic representation in FIG. 1 is a
block diagram of an audio device 1. The audio device 1 comprises an amplifier 2 having a first
amplifier channel 3, a second amplifier channel 4, a third amplifier channel 5 and a fourth
amplifier channel 6. The first amplifier channel 3 has a gain factor V 1, the second amplifier
channel 4 has a gain factor V 2, the third amplifier channel 5 has a gain factor V 3, and the
fourth amplifier channel 6 has a gain It has a rate V4. The first loudspeaker 7, the second
loudspeaker 8, the third loudspeaker 9 and the fourth loudspeaker 10 are connected to the audio
device 1. The amplifier channels 3 to 6 provide the output signals S1 to S4 amplified by the gain
factors V1 to V4. These amplified output signals S1 to S4 drive the loudspeakers 7 to 10.
[0019]
The first signal source is a tuner 11, a magnetic tape cassette device 12 and a CD player 13, and
the second signal source is a telephone unit 14. A tuner 11, a magnetic tape cassette device 12, a
CD player 13 and a telephone unit 14 are coupled to the input of the amplifier 2. The telephone
unit 14 has an antenna 15 and a hands free microphone 16. The audio device 1 comprises a
control unit 17 which is bidirectionally coupled to the amplifier 2, the tuner 11, the magnetic
tape cassette device 12, the CD player 13 and the telephone unit 14. This control unit 17 can be
realized, for example, by a microprocessor. The gain factors V1 to V4 can be separately
controlled by the control unit 17. The control unit 17 further controls which signal source (the
tuner 11, the magnetic tape cassette device 12, the CD player 13 or the telephone unit 14) drives
the amplifier 2. Control unit 17 is coupled to control panel / display unit 18. The control panel /
display unit 18 allows the user to send control information to the control unit 17, which controls
the amplifier 2, the tuner 11, the magnetic tape cassette device 12, the CD player 13 and the
telephone unit 14. Can be transferred by the control unit 17. Furthermore, visual information for
the user can be displayed on the control panel / display unit 18, for example information about
received stations, tracks in the CD player 13.
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[0020]
The four loudspeakers are basically mounted at the four corners inside the vehicle. If the audio
device is driven by an audio signal from one of the first signal sources (tuner 11, magnetic tape
cassette device 12 or CD player 13), the gain factors V1 to V4 of amplifier channel 3 of amplifier
2 are , Can be adjusted separately by the control panel / display unit 18 and the control unit 17.
If the driver of the vehicle is alone, he preferably has a gain factor V1 to V4 of amplifier channels
3 to 6 and an acoustic balance center of the loudspeakers 7 to 10 located near the driver. Will
adjust. However, for example, if there are four fellow passengers in the vehicle, the driver or user
can set the gain factors V1 to V4 such that the acoustic balance center of the loudspeakers 7 to
10 is centered inside the vehicle. It will adjust and as a result will allow the four people to
properly listen to the audio signal. The driver preferably makes this adjustment of the gain
factors V1 to V4 before leaving. Then, if the driver of the vehicle wants to call, he can indicate
this to the control unit 17 by means of the control panel / display unit 18. If the telephone unit
14 receives a telephone call, this is automatically detected by the control unit 17. In any case, the
audio device is not set to the talk state by the control unit 17, ie the audio signal received by the
antenna 15 of the telephone unit 14 is applied to the amplifier 2 and gained by the amplifier
channels 3 to 6 It is amplified by a factor V1 to V4 and transmitted acoustically by the
loudspeakers 7 to 10 to the user. During a call, the acoustic balance center of the loudspeakers 7
to 10 is automatically switched to a predetermined predetermined position by changing the gain
factors V1 to V4 of the amplifier channels 3 to 6. The hands free microphone 16 of the telephone
unit 14 is generally located near the driver on the left hand side of the vehicle, so that a certain
predetermined acoustic balance center of the loudspeakers 7 to 10 during a call, Usually, the
sound balance center is located sufficiently far from the hands-free microphone 16 and an audio
signal uttered by the driver and an audio signal uttered by the other party of the driver and
reproduced by the loudspeakers 7 to 10 Adjust to prevent acoustic feedback between
By properly adjusting the gain factors V1 to V4, it is possible to move the acoustic balance center
during a call to any position inside the vehicle, so that the acoustic characteristics of the
associated vehicle and the driver That is, it can be adapted to the user's wishes and requirements.
Changes in gain factors V1 to V4 occur automatically when the control unit detects an incoming
telephone call or when the user indicates to the control unit by the control panel / display unit
18 that he wishes to make a call. Thus, the user does not have to actively change the gain factor
for a call, and can immediately talk with a predetermined acoustic balance center of the
loudspeakers 7-10.
[0021]
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The setting of the gain factors V1 to V4 at which the amplifier 2 switches when driven by an
audio signal from the telephone unit 14 can be selected by the user, for example, when the audio
device 1 is activated. For this purpose, it is conceivable, for example, to store the gain factor in an
EEPROM 19 which can be accessed by the control unit 17. The control unit 17 can also execute
software which allows the user to select by the control panel / display unit 18 the gain factors
V1 to V4 which the audio device 1 switches during a call. Such selection of gain factors V1 to V4
by the control panel / display unit 18 is very user friendly and can be changed by the user
whenever he wishes.
[0022]
The acoustic balance center of the loudspeakers 7 to 10 during operation of the tuner 11, the
magnetic tape cassette device 12 or the CD player 13 is usually the acoustic balance center
required during operation of the telephone unit 14 to prevent acoustic feedback. Because it is
different, it is advantageous to advance gradually within a predetermined period, unless the
acoustic balance center is changed suddenly. This gradual change to the acoustic balance center
during an audio operation centered on acoustic balance can be achieved by means of the control
unit 17 by corresponding gradual and continuous adjustment of the gain factors V1 to V4. Such
gradual changes between the two acoustic balance centers are experienced smoothly and
comfortably by the user. The period during which the change in gain factors V1 to V4 is adapted
to the acoustic characteristics of the vehicle type and to the personal preferences and
requirements of the user by means of an EEPROM or by means of a software program
implemented in the control unit 17 it can.
[0023]
Obviously, the audio device 1 can also be driven by other signal sources, such as, for example, a
television unit or a navigation system. Similarly, amplifier 2 may comprise more than four
amplifier channels and more than four loudspeakers. The tuner 11, the magnetic tape cassette
device, the CD player and the telephone unit can also be incorporated separately or together into
the audio device 1. Furthermore, the control unit 17 and the amplifier 2 can be realized as
separate devices. Furthermore, it is conceivable for the amplifier 2 to be a preamplifier, which
drives the output amplifier, which drives the loudspeakers 7-10. The audio device 1 with the
amplifier 2 and the control unit 17 and the separate modules coupled to them, ie the tuner 11,
the magnetic tape cassette device 12, the CD player 13 and the telephone unit 14 chosen as an
implementation, are considered as examples only. It should. Furthermore, the amplifier 2 can also
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be realized as a digital signal processor. In this way, it is possible to realize, for example, a time
filter which can filter out unwanted echoes.
[0024]
FIG. 2 schematically shows the interior 20 of the vehicle but does not show it further. According
to FIG. 1, the loudspeaker 8 is placed in the front left corner of the interior 20, the loudspeaker 9
is placed in the front right corner, the loudspeaker 7 is placed in the rear left corner and the
loudspeaker 10 is placed in the rear right corner. In the front left area inside the vehicle, the
driver's seat is shown as a rectangle and the driver's head is shown schematically as a circle. The
hands free microphone 16 of the telephone unit 14 of FIG. 1 is located near the driver's seat 21
at the front left of the interior 20.
[0025]
The first acoustic balance center 23 is shown by way of example at the center of the interior 20
of the vehicle, preferably the audio signal source of FIG. 1 in the case of four passengers (tuner
11, magnetic tape cassette device 12, CD player Used for one audio operation of 13). Now,
during a call, when driven by the telephone unit of FIG. 1, the gain factor of the amplifier channel
of the amplifier 2 of FIG. 1 changes and as a result the acoustic balance center of the
loudspeakers 7, 8, 9 and 10 shifts. Do. The shaded area 27 in FIG. 2 shows the possible position
of the acoustic balance center during a call, ensuring sufficient operation of the hands free
microphone 16 without acoustic feedback. As an example, arrows 24a, 25a and 26a indicate the
path along which the acoustic balance center 23 during audio operation shifts to a possible
acoustic balance center 24, 25 and 26 during a call. The redistribution of arrow 24a preferably
slows between the acoustic balance center 23 and the acoustic balance center 24 by
continuously advancing the shift of the acoustic balance center 23 to the acoustic balance center
24 for a predetermined period of time. To show that a smooth change can be obtained. The
acoustic balance centers 24, 25 and 26 in the figure can be set by the user, for example by an
EEPROM or by a software program. When the audio device 2 of FIG. 1 is driven by an audio
signal from the telephone unit 14 of FIG. 1, the acoustic balance center 23 is automatically
shifted to a preset acoustic balance center, eg 24, during a call.
[0026]
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The audio device according to the invention allows all the loudspeakers mounted on the vehicle
to be used for the reproduction of the audio signal from the car telephone unit. The acoustic
balance center of the loudspeakers in a call can be separately preset and automatically changed
to the preset position in the case of a call.
[0027]
Brief description of the drawings
[0028]
1 is a block diagram of a vehicle audio device according to the present invention.
[0029]
FIG. 24 is a diagram showing the inside of a vehicle equipped with two loudspeakers and a
hands-free microphone.
[0030]
Explanation of sign
[0031]
DESCRIPTION OF SYMBOLS 1 audio device 2 for vehicle 2 amplifier 3, 4, 5, 6 amplifier channel
7, 8, 9, 10 loudspeaker 11 tuner 12 magnetic tape cassette device 13 CD player 14 telephone
unit 15 antenna 16 hands free microphone 17 control unit 18 control panel / Display unit 19
EEPROM 20 Vehicle interior 21 Driver's seat 22 Driver's head 23, 24, 25, 26 Sound balance
center 24a, 25a, 26a Path 27 Possible position
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