JP2010273175

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DESCRIPTION JP2010273175
The present invention provides an audio output device capable of outputting an audio by
preventing the wraparound of high frequency noise even when an external device is connected
without providing a separate part. An audio output device according to the present invention
includes a main body including an analog circuit and a digital circuit, a main body speaker
provided in the analog circuit and connected to a speaker amplifier, and an external device
connectable to the external device; A common connector having a connector terminal common to
a connector terminal of the device, an analog switch connected to the common connector and
capable of disconnecting an electrical connection between the connector of the external device
and the analog circuit, the analog switch And a controller for controlling the analog circuit and
the digital circuit, and when a charger as the external device is connected to the common
connector, the controller controls the connector of the external device and the analog. The analog
switch is controlled to disconnect the electrical connection with the circuit. [Selected figure]
Figure 1
Voice output device
[0001]
The present invention relates to an audio output device.
[0002]
Conventionally, in an audio output device connected to an external device (headset, charger, etc.)
via a common connector, noise of digital circuits on a sub-board in the audio output device
depends on the type of external device to be connected , And may get into analog circuits on the
same board.
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[0003]
With reference to FIG. 4 and FIG. 5, the wraparound of the above-described noise in the
conventional audio output device 80 will be described.
FIG. 4 is a diagram showing a state in which a conventional audio output device 80 is connected
to a headset 88 which is an external device, and FIG. 5 is a diagram showing a conventional audio
output device 80 connected to a charger 90 which is an external device. It is a figure which
shows the state which was carried out.
[0004]
The conventional audio output device 80 includes a main board 81, a sub board 82, an analog
GND 83, a digital GND 84, a speaker amplifier 85, a main body speaker 86, and a common
connector 87.
[0005]
The main substrate 81 includes an analog circuit 93 and a digital circuit 94.
In each of the circuits 93 and 94 on the main board 81, various electronic parts for performing
processing for outputting sound from the main body speaker 86 are mounted.
The analog circuit 93 and the digital circuit 94 share a common GND 95.
[0006]
The sub substrate 82 is connected to the main substrate 81 by a wire such as an analog GND 83
and a digital GND 84. The sub substrate 82 includes an analog circuit 96, a digital circuit 97, and
a common connector 87 for connecting to an external device. In each circuit on the sub substrate
82, various electronic components for performing processing for outputting sound from the main
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body speaker 86 are mounted. The analog circuit 96 includes a main body speaker 86 and a
speaker amplifier 85 connected to the main body speaker 86. The audio processed by each
circuit provided on the main substrate 81 and the sub substrate 82 is amplified by the speaker
amplifier 85 and output from the main body speaker 86.
[0007]
The common connector 87 comprises three terminals A, B, C. The configuration of each terminal
of the common connector 87 is common to the connector terminal of the external device to be
connected. Among the three terminals of the common connector 87, the terminal B is connected
to each circuit on the main substrate 81 via the analog GND 83. Among the three terminals of the
common connector 87, the terminal C is connected to the digital circuit 97, and each circuit on
the main substrate 81 is connected via the digital GND 84.
[0008]
Next, with reference to FIG. 4, a state in which the audio output device 80 is connected to the
headset 88 which is one of the external devices will be described. As shown in FIG. 4, the headset
88 includes a headset speaker 89 and a common connector 99 connected to the common
connector 87 of the audio output device 80.
[0009]
When the headset 88 is connected to the audio output device 80 through the common
connectors 87 and 99, the audio output device 80 controls the audio from the main body
speaker 86 to the headset speaker 89, whereby Audio is output.
[0010]
As shown in FIG. 4, the headset speaker 89 is connected to the terminals A and B of the common
connector 87 of the audio output device 80 through the terminals A and B of the common
connector 99, respectively.
Then, the terminal B of the common connector 87 of the audio output device 80 is connected to
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the analog circuit 96 of the sub board 82 without passing through the main board 81.
[0011]
Further, as shown in FIG. 4, the terminal C of the common connector 99 on the headset 88 side is
connected to the terminal C of the common connector 87 on the corresponding audio output
device 80 side. The terminal C of the common connector 87 on the audio output device 80 side is
connected to the digital circuit 97 of the sub board 82.
[0012]
Here, inside the headset 88, the terminal C of the common connector 99 on the headset 88 side
is not connected to the terminals A and B of the common connector 99 on the headset 88 side.
Therefore, in the audio output device 80, the digital circuit 97 of the sub substrate 82 of the
audio output device 80 is independent of the analog circuit on the same substrate via the headset
88 connected via the common connectors 87 and 99. There is. Therefore, even if high frequency
noise is generated in the digital circuit 97 of the sub substrate 82 of the audio output device 80,
the high frequency noise is not introduced to the analog circuit 96 on the same substrate.
[0013]
A state in which the audio output device 80 is connected to the charger 90, which is one of the
external devices, will be described with reference to FIG. As shown in FIG. 5, the charger 90
includes a common connector 98 for connecting to the common connector 87 of the audio
output device 80. Although not shown, the charger 90 includes a circuit for obtaining power
from various electronic components for charging the audio output device 80, an external
commercial power source, etc., and via the common connectors 87 and 98, The power is supplied
to the audio output device 80.
[0014]
When the charger 90 is connected to the audio output device 80 through the common connector
87, 99, the audio output device 80 controls each circuit on the respective boards 81, 82 to
obtain power from the charger 90, and the audio The output device 80 is ready for charging.
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[0015]
Japanese Patent Application Laid-Open No. 11-25203
[0016]
As shown in FIG. 5, the charger 90 is connected to the terminals A and B of the common
connector 87 of the audio output device 80 through the terminals A and B of the common
connector 98, respectively.
Then, the terminal B of the common connector 87 of the audio output device 80 is connected to
the analog circuit 96 of the sub board 82 without passing through the main board 81.
[0017]
Further, as shown in FIG. 5, the terminal C of the common connector 98 of the charger 90 is
connected to the terminal C of the common connector 87 on the side of the corresponding audio
output device 80.
The terminal C of the common connector 87 on the audio output device 80 side is connected to
the digital circuit 97 of the sub board 82.
[0018]
Here, inside the charger 90, the terminal C of the common connector 98 is connected to the
terminal B of the common connector 98. Therefore, the audio output device 80 is connected by
the charger 90 connected by the common connectors 87 and 98, and the digital circuit 97 of the
sub substrate 82 of the audio output device 80 is connected with the analog circuit 96 on the
same substrate. I did not. Therefore, when high frequency noise is generated in the digital circuit
97 of the sub-substrate 82 of the audio output device 80, the high frequency noise is leaked to
the analog circuit 96 on the same substrate. The high frequency noise is amplified by the speaker
amplifier 85 included in the analog circuit 96 and output from the main body speaker 86.
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[0019]
Therefore, when the audio output device 80 is connected to the charger 90 via the common
connectors 87 and 98, the high frequency noise generated in the digital circuit 97 is included in
the analog circuit 96 by looping into the analog circuit 96. The amplified signal is amplified by
the speaker amplifier 85 and output from the main body speaker 86. In this case, the
conventional audio output device 80 can not be used in a state where the conventional audio
output device 80 is connected to the charger 90. In addition, although it is possible to prevent
the noise from coming around as described above by changing the terminal structure of the
common connector 87, the terminal structure 87 of the common connector is common to the
terminal structure of the common connector of the external device and is simple. Even if the
terminal structure of the common connector 87 on the audio output device 80 side is changed,
the terminal structure of the common connectors on a plurality of different external device sides
must also be changed, which is not easy. Furthermore, Patent Document 1 discloses an electronic
device having an earphone jack provided with a separate part to prevent the wraparound of high
frequency noise, but separate parts are provided to prevent the wraparound of high frequency
noise. So it will be expensive.
[0020]
An object of the present invention is to provide a voice output device capable of voice output by
preventing the wraparound of high frequency noise even when an external device is connected
without providing a separate part.
[0021]
The present invention provides a main body including an analog circuit and a digital circuit, a
main body speaker provided in the analog circuit and connected to a speaker amplifier, and a
connector which can be connected to an external device and which is common to the connector
terminal of the external device A common connector having a terminal, an analog switch
connected to the common connector and capable of disconnecting the electrical connection
between the connector of the external device and the analog circuit, the operation of the analog
switch, the analog circuit, and And a controller configured to control the digital circuit, and when
a charger is connected to the common connector as the external device, the controller electrically
connects the connector of the external device to the analog circuit. An audio output device for
controlling the analog switch to be disconnected is provided.
[0022]
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In the above audio output device, the control unit can be controlled to turn on / off the power
supply of the speaker amplifier, and when a headset including a speaker as the external device is
connected to the common connector, the control unit is By controlling the power of the speaker
amplifier to ON, sound is output from the main body speaker and the speaker of the headset.
[0023]
According to the audio output device according to the present invention, even when an external
device is connected without providing a separate part, it is possible to output audio while
preventing the wraparound of high frequency noise.
[0024]
A block diagram showing the configuration of the audio output device 100 according to the
present embodiment. A diagram showing the audio output device 100 connected to the headset
8. A diagram showing the audio output device 100 connected to the charger 10. Conventional
audio output device 80 Shows a state in which the audio output device 80 is connected to the
headset 90.
[0025]
Hereinafter, embodiments of the present invention will be described with reference to the
drawings.
[0026]
FIG. 1 is a block diagram showing the configuration of the audio output device 100 of this
embodiment.
As shown in FIG. 1, the audio output device 100 of this embodiment includes a main board 1, a
sub board 2, an analog GND 3, a digital GND 4, a speaker amplifier 5, a main body speaker 6, and
a common connector 7. A CPU 11 and an analog switch 12 are provided.
[0027]
On the main substrate 1, a CPU 11, an analog circuit 13, and a digital circuit 14 are provided.
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The CPU 11 controls the analog circuit 13 and the digital circuit 14 on the main board 1 and the
analog circuit 16 and the digital circuit 17 on the sub board 2 to output sound to the main
speaker 6 on the sub board 2. .
Further, on the main substrate 1, the analog circuit 13 and the digital circuit 14 have a common
GND 15 which is a common ground of both circuits.
[0028]
The sub substrate 2 is connected to the main substrate 1 by an analog GND 3 and a digital GND 4
or the like.
The sub substrate 2 includes an analog switch 12, an analog circuit 16, a digital circuit 17, and a
common connector 7 for connecting to an external device.
The audio processed by each circuit provided on the main substrate 1 and the sub substrate 2 is
amplified by the speaker amplifier 5 and output from the main body speaker 6.
The power on / off of the speaker amplifier 5 is controlled by the CPU 11 on the main board 1.
When the power of the speaker amplifier 5 is ON, sound is output from the main body speaker 6.
When the power of the speaker amplifier 5 is OFF, no sound is output from the main body
speaker 6.
[0029]
The analog switch 12 switches the connection between the common connector 7 on the sub
substrate 2 and the analog GND 3. The analog switch 12 operates under the control of the CPU
11. When the analog switch 12 is turned off by the control of the CPU 11, the terminal B of the
common connector 7 is disconnected from the analog circuit 16 on the sub substrate 2.
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[0030]
Next, with reference to FIG. 2, a state in which the audio output device 100 is connected to the
headset 8 which is one of the external devices will be described. As shown in FIG. 2, the headset
8 includes a headset speaker 9 and a common connector 18 connected to the common connector
7 of the audio output device 100. When the headset 8 is connected to the audio output device
100 via the common connectors 7 and 18, the CPU 11 of the audio output device 100 controls
the output of audio from the main body speaker 6 to the headset speaker 9, thereby the headset
speaker Audio is output from 9.
[0031]
As shown in FIG. 2, the headset speaker 9 is connected to the terminals A and B of the common
connector 7 of the audio output device 100 through the terminals A and B of the common
connector 18, respectively. The terminal B of the common connector 7 of the audio output device
100 is connected to the analog circuit 16 of the sub board 2 via the analog switch 12.
[0032]
Further, as shown in FIG. 2, the terminal C of the common connector 18 on the headset 8 side is
connected to the terminal C of the corresponding common connector 7 on the audio output
device 100 side. The terminal C of the common connector 7 on the audio output device 100 side
is connected to the digital circuit 17 of the sub board 2.
[0033]
Here, inside the headset 8, the terminal C of the common connector 18 is not connected to the
terminal B of the common connector 18. Therefore, the digital circuit 17 of the sub substrate 2 of
the audio output device 100 is independent of the analog circuit 16 on the audio output device
100 by the headset 8 connected via the common connectors 7 and 18. . Therefore, even if high
frequency noise is generated in the digital circuit 17 of the sub substrate 2 of the audio output
device 100, the high frequency noise is not introduced to the analog circuit 16 on the same
substrate.
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[0034]
Further, the CPU 11 of the audio output device 100 controls the analog circuit 13 and the digital
circuit 14 on the main board 1 and the analog circuit 16 and the digital circuit 17 on the sub
board 2 to the main body speaker 6 on the sub board 2. Control to output voice is performed. In
the audio output device 100 of this embodiment, when the power supply of the speaker amplifier
is turned on and the headset 8 is connected, the analog switch 12 provided between the terminal
of the common connector 7 and the analog GND 3 is not disconnected. The CPU 11 can control
the analog switch 12. By such control, it is also possible to simultaneously output sound from the
headset speaker 9 of the headset 8 and the speaker 6 of the main body.
[0035]
A state in which the audio output device 100 is connected to the charger 10 which is one of the
external devices will be described with reference to FIG. As shown in FIG. 3, the charger 10
includes a common connector 19 for connecting to the common connector 7 of the audio output
device 100. Although not shown, the charger 10 includes a circuit for obtaining electric power
from various electronic components for charging the audio output device 100, an external
commercial power source, etc. Power can be supplied to the audio output device 100.
[0036]
When the charger 10 is connected to the audio output device 100 through the common
connectors 7 and 19, the CPU 11 of the audio output device 100 controls each circuit on each of
the substrates 1 and 2 in order to obtain power from the charger 10. , And the voice output
device 100 can be charged.
[0037]
As shown in FIG. 3, the charger 10 is connected to the terminal B of the common connector 7 of
the audio output device 100 through the terminal B of the common connector 19.
The terminal B of the common connector 7 of the audio output device 100 is connected to the
analog circuit 16 of the sub board 2 via the analog switch 12.
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[0038]
Further, as shown in FIG. 3, the terminal C of the common connector 19 of the charger 10 is
connected to the terminal C of the common connector 7 on the corresponding audio output
device 100 side. The terminal C of the common connector 7 on the audio output device 100 side
is connected to the digital circuit 17 of the sub board 2.
[0039]
Here, inside the charger 10, the terminal C of the common connector 19 is connected to the
terminal B of the common connector 19. Therefore, the digital circuit 17 of the sub substrate 2 is
connected to the analog circuit 16 on the same substrate via the charger 10 connected by the
common connectors 7 and 19 and the analog switch 12 of the audio output device 100.
However, as shown in FIG. 3, when the audio output device 100 of the present embodiment
connects the charger 10, the terminal B of the common connector 7 connected to the charger 10
by the disconnection operation of the analog switch 12 is It can be separated from the analog
circuit 16 of the sub substrate 2.
[0040]
Therefore, by disconnecting the terminal B of the common connector 7 and the analog circuit 16
of the sub substrate 2 by the analog switch 12, the digital circuit 17 of the sub substrate 2
located beyond the terminal C of the common connector 7 on the audio output device 100 side.
Is disconnected from the analog circuit on the same board. Therefore, even if high frequency
noise is generated in the digital circuit 17 on the sub substrate 2 of the audio output device 100,
for example, the high frequency noise does not go around to the analog circuit 16 on the sub
substrate 2 of the audio output device 100.
[0041]
As described above, when the audio output device 100 according to the present embodiment is
connected to the charger 10 through the common connectors 7 and 19, the analog switch 12
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uses the analog connector 12 and the analog circuit 16 on the sub board by the analog switch
12. By disconnecting, it is possible to prevent high frequency noise generated in the digital
circuit 17 from entering the analog circuit 16. Therefore, the audio output device 100 of the
present embodiment can be used in a state of being connected to the charger 10. Further, the
voice output device 100 of the present embodiment can be incorporated into a portable terminal
such as a telephone.
[0042]
Although the above-described high frequency noise can be prevented by changing the terminal
structure of the common connector 7, the terminal structure of the common connector 7 is
common to the terminal structures of the common connectors 18 and 19 of the external device.
Even if the terminal structure of the common connector 7 on the audio output device 100 side is
simply changed, the terminal structures of the common connectors 18 and 19 on a plurality of
different external device sides also have to be changed, which is not easy. Therefore, as in the
present embodiment, by providing the analog switch 12 inside the voice output device 100, the
voice output device 100 of the present embodiment is connected to the charger 10 without
changing the terminal structure of the common connector 7. Can be used in
[0043]
The audio output device according to the present invention has an effect that high frequency
noise can be prevented from coming around and audio output can be performed even when an
external device is connected without providing a separate part, and is useful as an audio output
device etc. .
[0044]
80, 100 audio output device 1, 81 main board 2, 82 sub board 3, 83 analog GND 4, 84 digital
GND 5, 85 speaker amplifier 6, 86 main body speaker 7, 18, 19, 87, 98, 99 common connector 8
, 88 headset 9, 89 headset speaker 10, 90 charger 11, 91 CPU 12, 92 analog switch 13, 93
analog circuit (main board) 14, 94 digital circuit (main board) 15, 95 common GND (main board)
) 16, 96 Analog circuit (Sub board) 17, 97 Digital circuit (Sub board)
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