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JP2017046289

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
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DESCRIPTION JP2017046289
Abstract: The present invention provides an electronic device capable of detecting whether a plug
of a four-pole plug earphone has been inserted into an earphone jack or whether a plug of an
extension cable for the four-pole plug earphone has been inserted. According to a voltage of a
node ND3 on a wire between a microphone sound processing unit 151 and a terminal D (MIC) of
an earphone jack 12, a first four-pole plug is an earphone. The first case in which the second
four-pole plug of the extension cable inserted in the jack 12 or having the connector to which the
first four-pole plug of the fourth-pole plug earphone is connected is inserted in the earphone jack
12 Alternatively, it is determined whether the second four-pole plug of the extension cable
having a connector to which the first four-pole plug of the four-pole plug earphone is not
connected is the second case inserted in the earphone jack 12. [Selected figure] Figure 15
Electronics
[0001]
The present disclosure relates to an electronic device.
[0002]
Conventionally, a device is known that can identify which one of a plurality of types of earphone
plugs has been inserted into an earphone jack.
[0003]
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1
For example, mobile phones equipped with a 5-pole earphone jack shared by a 4-pole plug and a
5-pole plug are known.
The 4-pole plug transmits a microphone signal, a left audio signal, a right audio signal, and a
ground voltage, and the 5-pole plug transmits a PTT switch signal, a microphone signal, a left
audio signal, a right audio signal, and a ground voltage.
[0004]
When the plug is inserted, a tone signal is output from the third jack terminal.
At this time, if the 4-pole plug is inserted, the tone signal is output as a leak signal from the first
jack terminal via the 4-pole earphone, and the leak signal is input to the control circuit after
being amplified. On the other hand, when the 5-pole plug is inserted, the leak signal is not
output. Such a configuration makes it possible to identify which one of the 4-pole plug and 5pole plug has been inserted.
[0005]
JP, 2013-66149, A
[0006]
By the way, it is necessary to detect whether the plug of the 4-pole plug earphone has been
inserted into the earphone jack or whether the plug of the extension cable for the 4-pole plug
earphone has been inserted.
[0007]
Therefore, an object of the present disclosure is to provide an electronic device capable of
detecting whether a plug of a four-pole plug earphone is inserted into an earphone jack or
whether a plug of an extension cable for a four-pole plug earphone is inserted. It is.
[0008]
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2
The electronic device of an embodiment includes an earphone jack connectable to one end of a
four-pole plug earphone and one end of an extension cable.
The four-pole plug earphone includes a first four-pole plug having a first terminal, a second
terminal, a third terminal, and a fourth terminal in order from the tip, and a microphone having
an output terminal and a ground terminal.
The third terminal of the first four pole plug is configured to connect to the ground terminal of
the microphone, and the fourth terminal of the first four pole plug is configured to connect to the
output terminal of the microphone.
[0009]
The extension cable includes a second four-pole plug having a first terminal, a second terminal, a
third terminal, and a fourth terminal in order from the tip, and a connector connectable to a fourpole plug earphone.
[0010]
When the four-pole plug earphone is not connected to the connector of the extension cable, the
third and fourth terminals of the second four-pole plug are opened.
When the 4-pole plug earphone is connected to the connector of the extension cable, the third
terminal of the second 4-pole plug is configured to be connected to the ground terminal of the
microphone of the 4-pole plug earphone, and the second four The fourth terminal of the pole
plug is configured to connect to the output terminal of the microphone of the four pole plug
earphone.
[0011]
The earphone jack includes a first terminal, a second terminal, a third terminal, a fourth terminal,
and a fifth terminal.
[0012]
When the first four pole plug or the second four pole plug is inserted into the earphone jack, the
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fifth terminal of the earphone jack is the fourth terminal of the first four pole plug or the second
terminal of the second four pole plug. The fourth terminal of the earphone jack is configured to
connect to the four terminals, and is configured to connect to the third terminal of the first fourpole plug or the third terminal of the second four-pole plug.
[0013]
The electronic device is further connected to a first node on a wire between the microphone
audio processing unit configured to connect to the fifth terminal of the earphone jack, and the
microphone audio processing unit and the fifth terminal of the earphone jack Depending on the
voltage of the first node and the pull-up resistor configured to be switched on, the current state is
that the first four-pole plug has been inserted into the earphone jack, or the first of the fourthpole plug earphones The first case in which the second four-pole plug of the extension cable with
the connector to which the four-pole plug is connected is inserted into the earphone jack, or the
first four-pole plug of the four-pole plug earphone is not connected And a controller configured
to determine whether the second four-pole plug of the extension cable having the connector is
the second case inserted in the earphone jack.
[0014]
According to one embodiment, it is possible to detect whether the plug of the four-pole plug
earphone has been inserted into the earphone jack or whether the plug of the extension cable for
the four-pole plug earphone has been inserted.
[0015]
It is a figure showing the composition of the personal digital assistant of an embodiment.
It is a figure showing a three-pole plug earphone.
It is a figure showing 4 pole plug earphone.
FIG. 6 shows an extension cable for a four-pole plug earphone.
It is a figure showing the state where the extension cable for 4 pole plugs was connected with 4
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4
pole plug earphones.
FIG. 5 represents the connection of the components in a three-pole plug earphone. FIG. 4
represents the connection of the components in a four-pole plug earphone. FIG. 17 illustrates
connection of components in an extension cable 93 for a four-pole plug earphone. It is a figure
showing the connection of the component in the state where the extension cable for 4 pole plug
earphones and 4 pole plug earphones were connected. It is a figure showing an earphone jack. It
is a figure for demonstrating an example of the azimuth on the inner surface of the earphone jack
plug insertion hole of terminal A, A ', B, C, D. FIG. It is a figure showing the state where the 3 pole
plug contained in 3 pole plug earphone was inserted in the earphone jack. It is a figure showing
the state where the 4 pole plug contained in 4 pole plug earphone was inserted in the earphone
jack. It is a figure showing the state where the 4-pole plug contained in the extension cable of 4pole plug earphone was inserted in the earphone jack. It is a figure for demonstrating the
structure for determining the kind of inserted plug in a portable terminal. It is a figure showing
the connection relation of the component of a portable terminal, and the component of 3 pole
plug earphone when 3 pole plug contained in 3 pole plug earphone is inserted in an earphone
jack. It is a figure showing the connection relation of the component of a portable terminal, and
the component of 4 pole plug earphone when the 3 pole plug contained in 4 pole plug earphone
is inserted in an earphone jack. It is a figure showing the connection of the component of a
portable terminal, and the component of the extension cable for 4 pole plug earphones when the
4 pole plug contained in the extension cable for 4 pole plug earphones is inserted in an earphone
jack. It is a figure showing the correspondence with voltage VD of node ND3 and the inserted
plug. It is a flowchart showing the identification procedure of the type of the inserted plug in 1st
Embodiment, and the control procedure according to the type of plug. It is a flowchart showing
the identification procedure of the type of the inserted plug in 2nd Embodiment, and the control
procedure according to the type of plug. It is a figure showing the example of the screen which
requires directions to a user. FIG. 23 is a flowchart showing the identification procedure of the
type of the inserted plug and the control procedure according to the type of the plug in the third
embodiment.
[0016]
Hereinafter, embodiments will be described with reference to the drawings. First Embodiment
The following description will be made using a portable terminal such as a smartphone as an
embodiment of the electronic device.
[0017]
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5
FIG. 1 is a diagram showing the configuration of the mobile terminal 1 according to the
embodiment. Referring to FIG. 1, the portable terminal 1 includes a central processing unit (CPU)
2, an antenna 961, a microphone 62, a speaker 63, a display 65, a touch panel 66, a memory
966, and an audio processing unit 3. , And an earphone jack 12. The CPU 2, the audio processing
unit 3, and the memory 966 constitute a control unit 521.
[0018]
The earphone jack 12 is connectable to a three-pole plug earphone 91, a four-pole plug earphone
92, and an extension cable 93 for the four-pole plug earphone.
[0019]
The CPU 2 can perform overall control and can also perform classification of the inserted
earphone.
[0020]
The antenna 961 can transmit and receive radio signals to and from a radio base station.
The touch panel 66 can receive an input from the user.
[0021]
The display 65 can display an image sent from the CPU 2.
The memory 966 can store various data.
[0022]
The microphone 62 can output the input audio signal to the audio processing unit 3. The speaker
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63 can reproduce the audio signal sent from the audio processing unit 3.
[0023]
When nothing is inserted into the earphone jack 12 or when the extension cable 93 is inserted
into the earphone jack 12 (however, the 4-pole plug earphone is not inserted into the other end)
An audio signal can be set to be outputable only to the speaker 63 of the portable terminal 1.
[0024]
The voice processing unit 3 is an extension cable 93 in which the four-pole plug earphone 92 is
connected to the other end when the three-pole plug earphone 91 is inserted into the earphone
jack 12 or when the four-pole plug earphone 92 is inserted. When is inserted, an audio signal
can be set to be output to the earphone jack 12.
[0025]
In the audio processing unit 3, when nothing is inserted in the earphone jack 12, the three-pole
plug earphone 91 is inserted in the earphone jack 12, or the extension cable 93 is inserted in the
earphone jack 12 (however, When the four-pole plug earphone is not inserted at the other end),
only the audio signal from the microphone 62 of the portable terminal 1 can be set to be input
enabled.
[0026]
When the four-pole plug earphone 92 is inserted into the earphone jack 12 or when the
extension cable 93 to which the four-pole plug earphone 92 is connected is inserted at the other
end, the voice processing unit 3 Only audio signals can be set to be input enabled.
[0027]
FIG. 2 is a diagram showing the three-pole plug earphone 91. As shown in FIG.
The three-pole plug earphone 91 includes a three-pole plug 51, a cable 81, a silicone cap 13a for
the left ear, a housing 16a and a speaker 17a, a silicone cap 13b for the right ear, a housing 16b
and a loudspeaker 17b. .
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[0028]
By inserting the three-pole plug 51 into the earphone jack 12 of the portable terminal 1, the
three-pole plug earphone 91 and the portable terminal 1 are connected.
[0029]
FIG. 3 is a diagram showing the four-pole plug earphone 92. As shown in FIG.
The four-pole plug earphone 92 includes a four-pole plug 52, a cable 82, a microphone 28, a
silicone cap 23a for the left ear, a housing 26a and a speaker 27a, a silicone cap 23b for the
right ear, a housing 26b and a loudspeaker And 27b.
[0030]
By inserting the four-pole plug 52 into the earphone jack 12 of the portable terminal 1, the fourpole plug earphone 92 and the portable terminal 1 are connected.
[0031]
FIG. 4 is a view showing an extension cable 93 for a four-pole plug earphone.
The extension cable 93 for the four-pole plug earphone includes a four-pole plug 53, a cable 83,
and a connector 29.
[0032]
Four-pole plug 53 has the same shape and characteristics as four-pole plug 52 included in fourpole plug earphone 92.
The extension cable 93 and the portable terminal 1 are connected by inserting the four-pole plug
53 into the earphone jack 12 of the portable terminal 1.
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8
[0033]
The connector 29 is connected to the four-pole plug 52 included in the four-pole plug earphone
92, whereby the extension cable 93 of the four-pole plug earphone and the four-pole plug
earphone 92 are connected.
[0034]
FIG. 5 is a diagram showing a state in which the extension cable 93 for the four-pole plug is
connected to the four-pole plug earphone 92.
[0035]
When the four-pole plug 52 included in the four-pole plug earphone 92 is connected to the
connector 29 included in the extension cable 93 for the four-pole plug, a four-pole plug earphone
whose cable length is extended is formed.
[0036]
FIG. 6 is a diagram showing connection of components in the three-pole plug earphone 91. As
shown in FIG.
The three-pole plug 51 included in the three-pole plug earphone 91 is a plug conforming to the
EIAJ (Electronic Industries Association of Japan) standard.
The diameter of the three-pole plug 51 is 3.5 mm.
The three-pole plug 51 includes a left audio terminal (L) (first terminal), a right audio terminal (R)
(second terminal), and a ground terminal (GND) (third terminal) in order from the tip.
The portions shown in black in FIG. 6 are made of an insulator.
[0037]
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9
The speaker 17a included in the three-pole plug earphone 91 can have an input terminal 95a
and a voltage input terminal (ground terminal) 96a for grounding.
The speaker 17 b included in the three-pole plug earphone 91 can have an input terminal 95 b
and a voltage input terminal (ground terminal) 96 b for grounding.
[0038]
The left audio terminal (L) can be connected to the input terminal 95a of the speaker 17a. The
right audio terminal (R) can be connected to the input terminal 95b of the speaker 17b. The
ground terminal (GND) can be connected to the ground terminal 96a of the speaker 17a and the
ground terminal 96b of the speaker 17b.
[0039]
FIG. 7 is a diagram showing connection of components in four-pole plug earphone 92. Referring
to FIG. The four-pole plug 52 included in the four-pole plug earphone 92 is a plug conforming to
the EIAJ standard. The diameter of the four-pole plug 52 is 3.5 mm. In addition, the signal
arrangement of the four-pole plug 52 conforms to the Cellular Telephone Industry Association
(CTIA). The four-pole plug 52 has a left audio terminal (L) (first terminal), a right audio terminal
(R) (second terminal), a ground terminal (GND) (third terminal), and a microphone terminal in
order from the tip. (M) (fourth terminal)
[0040]
The speaker 27a included in the four-pole plug earphone 92 can have an input terminal 71a and
a voltage input terminal (ground terminal) 72a for grounding. The speaker 27 b included in the
four-pole plug earphone 92 can have an input terminal 71 b and a voltage input terminal
(ground terminal) 72 b for grounding. The microphone 28 can have an output terminal 74 and a
voltage input terminal (ground terminal) 73 for ground.
[0041]
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10
The left audio terminal (L) can be connected to the input terminal 71a of the speaker 27a. The
right audio terminal (R) can be connected to the input terminal 71b of the speaker 27b. The
ground terminal (GND) can be connected to the ground terminal 72a of the speaker 27a, the
ground terminal 72b of the speaker 27b, and the ground terminal 73 of the microphone 28. The
microphone terminal (M) can be connected to the output terminal 74 of the microphone 28.
[0042]
FIG. 8 is a diagram showing connection of components in the extension cable 93 for the fourpole plug earphone.
[0043]
The four-pole plug 53 included in the extension cable 93 is similar to the four-pole plug 52.
The left audio terminal (L), the right audio terminal (R), the ground terminal (GND), and the
microphone terminal (M) are open.
[0044]
FIG. 9 is a diagram showing connection of components in a state in which the extension cable 93
for the four-pole plug earphone and the four-pole plug earphone 92 are connected.
[0045]
The left audio terminal (L) of the four-pole plug 53 included in the extension cable 93 is
connected to the four-pole plug earphone 92 in the left audio terminal (L), so the input terminal
71a of the speaker 27a included in the four-pole plug earphone 92 is Connected
The right audio terminal (R) of the four-pole plug 53 included in the extension cable 93 is
connected to the four-pole plug earphone 92 on the right audio terminal (R) of the four-pole plug
earphone 92. Connected The ground terminal (GND) of the four-pole plug 53 included in the
extension cable 93 is connected to the four-pole plug earphone 92, so the ground terminals 72a
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11
and 4a of the speaker 27a included in the four-pole plug earphone 92 It is connected to the
ground terminal 72 b of the speaker 27 b included in the pole plug earphone 92 and the ground
terminal 73 of the microphone 28 included in the four pole plug earphone 92. Because the
extension cable 93 is connected to the four-pole plug earphone 92, the microphone terminal (M)
of the four-pole plug 53 included in the extension cable 93 is connected to the output terminal
74 of the microphone 28 included in the four-pole plug earphone 92 Be done.
[0046]
FIG. 10 shows the earphone jack 12. As shown in FIG. 10, a plug insertion hole 600 is formed
inside the earphone jack 12.
[0047]
Terminal A '(DET) (first terminal), terminal A (LCH) (second terminal), terminal B (RCH) (third
terminal) in order from the back side on the inner surface of plug insertion hole 600 of earphone
jack 12 , Terminal C (GND) (fourth terminal), and terminal D (MIC) (fifth terminal).
[0048]
FIG. 11 is a view for explaining an example of the azimuth on the inner surface of the plug
insertion hole 600 of the earphone jack 12 of the terminals A, A ′, B, C, D.
[0049]
FIG. 11A is a cross-sectional view of the plug insertion hole 600 shown in FIG. 10 along the line
I-I '.
The terminal A ′ (DET) is disposed at an azimuth of 90 ° on the inner surface of the radius r1
of the plug insertion hole 600.
[0050]
Terminal A (LCH) is arranged at an azimuth angle of 180 ° on the inner surface of radius r 1 of
plug insertion hole 600.
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12
[0051]
FIG. 11B is a cross-sectional view taken along the line II-II ′ of the plug insertion hole 600
shown in FIG.
Terminal B (RCH) is arranged at an azimuth of 0 ° on the inner surface of radius r 2 of plug
insertion hole 600.
ただし、r2>r1である。
[0052]
FIG. 11C is a cross-sectional view taken along the line III-III ′ of the plug insertion hole 600
shown in FIG. Terminal C (GND) is arranged at an azimuth angle of 0 ° on the inner surface of
radius r2 of plug insertion hole 600.
[0053]
FIG. 11D is a cross-sectional view taken along line IV-IV ′ of the plug insertion hole 600 shown
in FIG. Terminal D (MIC) is arranged at an azimuth angle of 180 ° on the inner surface of radius
r 2 of plug insertion hole 600.
[0054]
FIG. 12 is a diagram showing a state in which the three-pole plug 51 included in the three-pole
plug earphone 91 is inserted into the earphone jack 12.
[0055]
Referring to FIG. 12, when the three-pole plug 51 is inserted into the earphone jack 12, the
three-pole plug 51 can be connected to the earphone jack 12 as follows.
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13
[0056]
The left audio terminal (L) can be connected to the terminal A (LCH) and the terminal A '(DET).
The right audio terminal (R) can be connected to the terminal B (RCH).
A ground terminal (G) can be connected to the terminal C (GND) and the terminal D (MIC).
[0057]
FIG. 13 is a diagram showing a state in which four-pole plug 52 included in four-pole plug
earphone 92 is inserted into earphone jack 12.
[0058]
When the four-pole plug 52 is inserted into the earphone jack 12, it can be connected to the
earphone jack 12 as follows.
[0059]
The left audio terminal (L) can be connected to the terminal A (LCH) and the terminal A '(DET).
The right audio terminal (R) can be connected to the terminal B (RCH).
The ground terminal (G) can be connected to the terminal C (GND). The microphone terminal (M)
can be connected to the terminal D (MIC).
[0060]
FIG. 14 is a diagram showing a state in which the four-pole plug 53 included in the extension
cable 93 of the four-pole plug earphone is inserted into the earphone jack 12.
[0061]
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14
When the four-pole plug 53 is inserted into the earphone jack 12, it can be connected to the
earphone jack 12 as follows.
[0062]
The left audio terminal (L) can be connected to the terminal A (LCH) and the terminal A '(DET).
The right audio terminal (R) can be connected to the terminal B (RCH).
The ground terminal (G) can be connected to the terminal C (GND). The microphone terminal (M)
can be connected to the terminal D (MIC).
[0063]
FIG. 15 is a diagram for describing a configuration for determining the type of the inserted plug
in the portable terminal 1.
[0064]
The audio processing unit 3 includes a microphone audio processing unit 151, a first audio
output unit 152, and a second audio output unit 153.
[0065]
The microphone sound processing unit 151 includes an amplifier 5 and an ADC (Analog to
Digital Converter) 4.
The input of the amplifier 5 can be connected to the terminal D (MIC) of the earphone jack 12.
The amplifier 5 can amplify an audio signal output from the terminal D (MIC). The ADC 4 can
convert the audio signal output from the amplifier 5 into a digital signal.
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15
[0066]
The first audio output unit 152 includes a DAC (Digital to Analog Converter) 6 and an amplifier
7. The DAC 6 can convert the digital audio signal for the left ear into an analog audio signal. The
amplifier 7 can amplify or attenuate the audio signal output from the DAC 6. The output of the
amplifier 7 can be connected to the terminal A (LCH) of the earphone jack 12.
[0067]
The second audio output unit 153 includes a DAC 8 and an amplifier 9. The DAC 8 can convert
the digital audio signal for the right ear into an analog audio signal. The amplifier 9 can amplify
or attenuate the audio signal output from the DAC 8. The output of the amplifier 9 can be
connected to the terminal B (RCH) of the earphone jack 12.
[0068]
The voltage setting unit 154 includes a first pull-up resistor R1 (= 100 kΩ), a first pull-down
resistor R2 (= 10 kΩ), a second pull-up resistor R3 (= 2.2 kΩ), and a ground power supply 155
Equipped with
[0069]
The first pull-up resistor R1 is connected between a node ND1 on the wiring between the
terminal A ′ (DET) of the earphone jack 12 and the CPU 2 and the power supply voltage VDD (=
2 V) for pull-up. be able to.
[0070]
The first pull-down resistor R 2 can be connected between the ground power supply 155 and a
node ND 2 on the wire between the terminal A (LCH) of the earphone jack 12 and the first audio
output unit 152.
[0071]
The second pull-up resistor R3 is a node ND3 on the wiring between the terminal A (MIC) of the
earphone jack 12 and the microphone audio processing unit 151 and a bias voltage MICBIAS (=
1.8 V) for pull-up. It can be connected between.
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16
[0072]
The ground power supply 155 is connected to the terminal C (GND) of the earphone jack 12.
The CPU 2 has an ADC (Analog to Digital Converter) 372 and a GPIO (General Purpose Input /
Output) interface 11.
The GPIO interface 11 has a terminal GPIO_0.
[0073]
Terminal GPIO_0 can be connected to node ND1.
The terminal GPIO can receive the voltage DET of the node ND1.
[0074]
ADC 372 can be connected to node ND3.
The ADC 372 can convert the analog voltage value of the node ND3 into a digital value.
[0075]
FIG. 16 is a diagram showing a connection between the components of portable terminal 1 and
the components of three-pole plug earphone 91 when three-pole plug 51 included in three-pole
plug earphone 91 is inserted into earphone jack 12. .
[0076]
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17
The speaker 17a connected between the left audio terminal (L) and the ground terminal (G) of
the three-pole plug 51 is represented by a resistance RX (= 8 Ω) when represented by an
equivalent circuit.
The speaker 17 b connected between the right audio terminal (R) and the ground terminal (G) of
the three-pole plug 51 is represented by a resistance RY (= 8 Ω) in the equivalent circuit.
[0077]
When the three-pole plug 51 is inserted into the earphone jack 12, the node ND1 can be
connected to the power supply voltage VDD via the first pull-up resistor R1 (= 100 kΩ). The
node ND1 can be further connected to the ground power supply 155 via the terminal A ′ (DET),
the left audio terminal (L), the terminal A (LCH), and the first pull-down resistor R2 (= 10 kΩ).
Node ND1 is further connected to ground power supply 155 through terminal A '(DET), left audio
terminal (L), resistor RX (= 8.OMEGA.), Ground terminal (G), and terminal C (GND). Can. Since the
value of the resistance RX is small, the voltage of the node ND1 is pulled down to be low level (L),
and the detection signal DET input to GPIO_0 becomes low level (L).
[0078]
When the three-pole plug 51 is inserted into the earphone jack 12, the node ND3 can be
connected to the bias voltage MICBIAS via the second pull-up resistor R3 (= 2.2 kΩ). The node
ND3 is further connected to the ground power supply 155 through the terminal D (MIC) and the
ground terminal (G), and therefore becomes approximately 0V. As a result, the digital value
obtained by the ADC 372 becomes a value close to "0".
[0079]
FIG. 17 is a diagram showing a connection between the components of portable terminal 1 and
the components of four-pole plug earphone 92 when three-pole plug 52 included in four-pole
plug earphone 92 is inserted into earphone jack 12. .
[0080]
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The speaker 27a connected between the left audio terminal (L) and the ground terminal (G) of
the four-pole plug 52 is represented by a resistance RX (= 8Ω) when represented by an
equivalent circuit.
The speaker 27 b connected between the right audio terminal (R) and the ground terminal (G) of
the four-pole plug 52 is represented by a resistor RY (= 8 Ω) when represented by an equivalent
circuit. The microphone 29 connected between the microphone terminal (M) and the ground
terminal (G) of the four-pole plug 52 is represented by a resistor RZ when represented by an
equivalent circuit. The value of the resistor RZ is several kΩ to several MΩ.
[0081]
When the four-pole plug 52 is inserted into the earphone jack 12, the detection signal DET input
to the GPIO_0 becomes low level (L) as in the case where the three-pole plug 51 is inserted into
the earphone jack 12.
[0082]
When the four-pole plug 52 is inserted into the earphone jack 12, the node ND3 can be
connected to the bias voltage MICBIAS via the second pull-up resistor R3 (= 2.2 kΩ).
The node ND3 can be further connected to the ground power supply 155 via the terminal D
(MIC), the microphone terminal (M), the resistor RZ, and the ground terminal (G). As a result, the
voltage of the node ND3 is MICBIAS × {RZ / (RZ + R3)}. When the value of RZ is large, the
voltage of the node ND3 is large, and when the value of RZ is small, the voltage of the node ND3
is small. As the value of RZ is larger, the voltage of the node ND3 becomes closer to the bias
voltage MICBIAS.
[0083]
The components of the portable terminal 1 when the four-pole plug 53 of the extension cable 93
having the connector 29 to which the four-pole plug earphone 92 is connected is inserted into
the earphone jack 12, the extension cable 93 and the four-pole plug earphone 92 The connection
relationship with the component elements of is the same as in FIG.
[0084]
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19
FIG. 18 shows components of the portable terminal 1 when the 4-pole plug 53 included in the
extension cable 93 for 4-pole plug earphone is inserted into the earphone jack 12 and
components of the extension cable 93 for 4-pole plug earphone It is a figure showing the
connection relation of.
However, it is assumed that the four-pole plug earphone 92 is not connected to the connector 29
of the extension cable 93.
[0085]
The left audio terminal (L), the ground terminal (G), the right audio terminal (R), and the
microphone terminal (M) of the four-pole plug 53 are opened.
[0086]
When the four-pole plug 53 is inserted into the earphone jack 12, the detection signal DET input
to the GPIO_0 becomes low level (L) as in the case where the three-pole plug 51 is inserted into
the earphone jack 12.
[0087]
The node ND3 can be connected to the bias voltage MICBIAS via a second pull-up resistor R3 (=
2.2 kΩ).
The node ND3 can be further connected to the microphone terminal (M) via the terminal D (MIC).
Since the microphone terminal (M) is open, the voltage of the node ND3 becomes MICBIAS.
[0088]
FIG. 19 is a diagram showing the correspondence between the voltage VD of the node ND3 and
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20
the inserted plug. In the present disclosure, as shown in FIG. 19, the CPU 2 identifies the type of
the inserted plug by the magnitude of the voltage of the node ND3.
[0089]
The CPU 2 can determine that the inserted plug is the three-pole plug 51 included in the threepole plug earphone 91 when the voltage of the node ND3 is less than the threshold TH1. A value
close to “0” can be set as the threshold TH1. This state is hereinafter referred to as a third
case.
[0090]
When the voltage of node ND3 is equal to or greater than threshold TH1 and less than threshold
TH2, CPU 2 includes four-pole plug 52 or connector in which the inserted plug is included in
four-pole plug earphone 92 (when the value of Rz is small). It can be determined that the fourpole plug 53 included in the extension cable 93 to which the plug earphone 92 (when the value
of Rz is small) is connected. A value close to MICBIAS can be set as the threshold TH2. This state
is hereinafter referred to as a first case.
[0091]
When the voltage of the node ND3 is equal to or higher than the threshold TH2, the CPU 2 is
either the first case or the four-pole plug 53 included in the extension cable 93 in which the fourpole plug earphone 92 is not connected to the connector It can be determined that Hereinafter,
the state of the four-pole plug 53 included in the extension cable 93 where the inserted plug is
not connected to the four-pole plug earphone 92 is referred to as a second case. CPU 2 further
determines that the current state is the first case when the temporal fluctuation of the voltage of
node ND 3 is equal to or higher than the predetermined value, and the current state is the second
when the fluctuation of the voltage of node ND 3 is less than the predetermined value. It can be
determined that this is the case. When the four-pole plug 53 of the extension cable 93 with the
four-pole plug earphone 92 connected to the four-pole plug 52 or the connector 29 is inserted
into the earphone jack 12, the surrounding audio is represented from the microphone 28 of the
four-pole plug earphone 92 This is because an audio signal is output to the earphone jack 12.
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[0092]
Here, an average value of the difference between the audio signal within a predetermined time
and a predetermined reference value or a maximum value of the difference between the audio
signal within a predetermined time and the predetermined reference value as the time variation
of the voltage of node ND3. Can be used.
[0093]
FIG. 20 is a flowchart showing a procedure of identifying the type of the inserted plug in the first
embodiment and a control procedure according to the type of the plug.
[0094]
Referring to FIG. 20, in step S102, CPU 2 determines the level of detection signal DET.
When the three-pole plug 51, the four-pole plug 52, or the four-pole plug 53 is inserted in the
earphone jack 12, the node ND1 is at the low level (L) as described above.
[0095]
If the detection signal DET is at the low level (L), the process proceeds to step S103.
In step S103, the CPU 2 determines that the three-pole plug 51, the four-pole plug 52, or the
four-pole plug 53 is inserted into the earphone jack 12.
[0096]
In step S104, the ADC 372 can convert the voltage of the node ND3 into a digital value VD.
[0097]
In step S105, when the digital value VD output from the ADC 372 is less than the threshold TH1,
the process proceeds to step S106, and when the digital value VD is greater than or equal to the
threshold TH1, the process proceeds to step S107.
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22
[0098]
In step S106, the CPU 2 can determine that the current state is the third case.
The third case refers to the case of the three-pole plug 51 in which the plug inserted in the
earphone jack 12 is included in the three-pole plug earphone 91 as described above.
[0099]
In step S107, when the digital value VD output from the ADC 372 is greater than or equal to the
threshold TH1 and less than the threshold TH2, the process proceeds to step S108, and when the
digital value VD is greater than or equal to the threshold TH2, the process proceeds to step S109.
[0100]
In step S108, the CPU 2 can determine that the current state is the first case.
In the first case, as described above, the four-pole plug 52 whose plug inserted in the earphone
jack 12 is included in the four-pole plug earphone 92 or the extension cable 93 where the fourpole plug earphone 92 is connected to the connector 29 This refers to the case of the four-pole
plug 53 included.
[0101]
In step S109, when the time variation of digital value VD is less than predetermined value THV,
the process proceeds to step S110, and when the time variation of digital value VD is equal to or
more than predetermined value THV, the process proceeds to step S111.
[0102]
In step S110, the CPU 2 can determine that the current state is the second case.
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The second case refers to the case of the four-pole plug 53 included in the extension cable 93 in
which the plug inserted in the earphone jack 12 is not connected to the connector 29 as
described above.
[0103]
In step S111, the CPU 2 can determine that the current state is the first case.
[0104]
If it is determined in step S112 that the current state is the third case, the process proceeds to
step S113, and if it is determined in step S114 that the current state is the first case, the process
The process proceeds to step S115, and when it is determined in step S116 that the current state
is the second case, the process proceeds to step S117.
[0105]
In step S113, the audio processing unit 3 can set the audio signal to be outputable to the
earphone jack 12 through the first audio output unit 152 and the second audio output unit 152.
The audio processing unit 3 can be set to be capable of inputting (meaning can be accepted) an
audio signal from the microphone 62 of the portable terminal 1.
[0106]
In step S115, the audio processing unit 3 can set the audio signal to be outputtable to the
earphone jack 12 through the first audio output unit 152 and the second audio output unit 152.
The audio processing unit 3 can set the audio signal input from the earphone jack 12 to the
microphone audio processing unit 151 to be input enabled (meaning acceptable).
[0107]
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In step S117, the audio processing unit 3 can set the audio signal to be able to be output to the
speaker 63 of the portable terminal 1.
The audio processing unit 3 can be set to be capable of inputting (meaning can be accepted) an
audio signal from the microphone 62 of the portable terminal 1.
[0108]
As described above, according to the present embodiment, the plug of the 4-pole plug earphone
(including the earphone of the extension plug with the 4-pole plug connected to the connector) is
inserted into the earphone jack based on the potential of node ND3. It is possible to determine
whether the plug of the extension cable for the 4-pole plug earphone without the 4-pole plug
earphone connected to the connector is inserted or the plug of the 3-pole plug earphone is
inserted.
[0109]
Second Embodiment The present embodiment takes into consideration the case where the time
variation of the audio signal from the microphone 28 of the four-pole plug earphone 92 is small
and is less than the threshold THV.
[0110]
FIG. 21 is a flowchart showing the identification procedure of the type of the inserted plug and
the control procedure according to the type of the plug in the second embodiment.
[0111]
The difference between the flowchart of FIG. 21 and the flowchart of FIG. 20 is as follows.
In step S109, when the variation of the digital value VD is less than the predetermined value, the
process proceeds to step S309, and when the variation of the digital value VD is equal to or more
than the predetermined value, the process proceeds to step S111.
[0112]
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25
In step S309, the CPU 2 can display an instruction request message 251 for the user as shown in
FIG.
[0113]
In step S302, the plug inserted by the user touching the OK button 252 is the four-pole plug 52
of the four-pole plug earphone 92 (four-pole extension cable 93 with the four-pole plug
earphone 92 connected to the connector 29). When it is instructed that the plug 53 is included,
the process proceeds to step S111, and when the user does not touch the OK button 252, the
process proceeds to step 303.
[0114]
In step S303, the CPU 2 can determine that the current state is the second case.
[0115]
In step S111, the CPU 2 can determine that the current state is the first case.
[0116]
As described above, according to the present embodiment, even when the time variation of the
audio signal from the microphone 28 of the four-pole plug earphone 92 is small and it can not be
used for plug identification, it is possible to use user assistance. As in the first embodiment, it
becomes possible to identify the type of the inserted plug.
[0117]
Third Embodiment In the present embodiment, when the voltage of the node ND3 is equal to or
higher than the threshold value TH2, the assistance of the user is not based on the time variation
of the audio signal from the microphone 28 of the four-pole plug earphone 92. , Determine
whether the current state is the first case or the second case.
[0118]
FIG. 23 is a flowchart showing the identification procedure of the type of the inserted plug and
the control procedure according to the type of the plug in the third embodiment.
[0119]
In step S107, when the digital value VD output from the ADC 372 is greater than or equal to the
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threshold TH1 and less than the threshold TH2, the process proceeds to step S108, and when the
digital value VD is greater than or equal to the threshold TH2, the process proceeds to step S201.
[0120]
In step S201, the CPU 2 can display on the display 65 an instruction request message 251 for
the user as shown in FIG.
[0121]
In step S202, the plug inserted by the user touching the OK button 252 is the four-pole plug 52
of the four-pole plug earphone 92 (four poles of the extension cable 93 with the four-pole plug
earphone 92 connected to the connector 29). If it is instructed that the plug 53 is included, the
process proceeds to step S203. If the user does not touch the OK button 252, the process
proceeds to step S204.
[0122]
In step S203, the CPU 2 can determine that the current state is the second case.
[0123]
In step S204, the CPU 2 can determine that the current state is the first case.
[0124]
As described above, according to the present embodiment, the type of the inserted plug can be
identified by using the user's assistance, as in the first embodiment.
[0125]
The present disclosure is not limited to the above embodiments, and includes, for example, the
following modifications.
[0126]
(1) Electronic Device In the above embodiment, a portable terminal is described as an example of
the electronic device, but the electronic device of the present disclosure is not limited to the
portable terminal, and may be a personal computer or a tablet. Things are also included.
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[0127]
(2) When the voltage of the user instruction node ND3 is equal to or higher than the threshold
TH1, the CPU 2 requests the user to indicate whether the current state is the first case or the
second case, based on the user's instruction. The current state may be determined.
[0128]
(3) Audio processing unit The microphone audio processing unit 151, the first audio output unit
152, and the second audio output unit 153 process audio signals from the microphone 28
included in the earphones 92, and the audio signals are output as earphones. Although it is for
processing in order to output to the speakers 17a, 17b, 27a, 27b of 91, 92, it does not limit to
this.
The microphone audio processing unit 151, the first audio output unit 152, and the second audio
output unit 153 process the audio signal from the microphone 62 of the portable terminal 1 and
output the audio signal to the speaker 63 of the portable terminal 1 Processing may also be
performed to
That is, the DAC 6, the DAC 8, the amplifier 7, and the amplifier 9 are also used to process the
audio signal sent to the speaker 63 of the portable terminal 1, and the amplifier 5 and the ADC 4
are also capable of processing the audio signal from the microphone 62 of the portable terminal
1 It may be used.
[0129]
(4) Determination In the above embodiment, the portable terminal 1 can be connected to the
three-pole plug earphone 91, the four-pole plug earphone 92, and the extension cable 93 for the
four-pole plug earphone, and the CPU 2 is in the current state Although it is determined that the
first case, the second case, or the third case is determined, the present invention is not limited to
this.
For example, the portable terminal 1 can be connected only to the 4-pole plug earphone 92 and
the extension cable 93 for the 4-pole plug earphone, and the CPU 2 determines whether the
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current state is the first case or the second case. It may be determined.
[0130]
It should be understood that the embodiments disclosed herein are illustrative and nonrestrictive in every respect.
The scope of the present disclosure is indicated not by the above description but by the claims,
and is intended to include all modifications within the meaning and scope equivalent to the
claims.
[0131]
Reference Signs List 1 mobile terminal, 2 CPU, 3 audio processing unit, 11 GPIO interface, 12
earphone jacks, 13a, 13b, 23a, 23b silicon cap, 16a, 16b, 26a, 26b housing, 17a, 17b, 27a, 27b,
63 speakers, 28, 62 microphone, 29 connector, 51 3 pole plug, 52, 53 4 pole plug, 65 display,
66 touch panel, 72 ADC, 71a, 71b, 95a, 95b input terminal, 72a, 72b, 96a, 96b ground terminal,
74 Output terminal 81, 82, 83 cable, 91 three-pole plug earphone, 92 four-pole plug earphone,
extension cable for 93 four-pole plug earphone, 151 microphone sound processor, 152, 153
voice output unit, 154 voltage setting unit, 155 ground, 372 ADC 521 control unit, 961 antenna,
966 memory, L left audio terminal, R right audio terminal, G ground terminal, M microphone
terminal, A, A ', B, C, D earphone jack terminals, R1, R2, R3, RX , RY, RZ resistance.
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