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DESCRIPTION JP2018007243

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DESCRIPTION JP2018007243
Abstract: To provide an audio device with improved sound quality capable of outputting single
and differential signals. An audio apparatus according to an embodiment of the present invention
is an analog device which receives a digital left channel signal and a digital right channel signal
and outputs first and second analog left signals and first and second analog right signals. A first
output port comprising first to fifth conductors, to which the first and second analog left signals,
the first and second analog right signals and the ground voltage are respectively applied to the
first to fifth conductors A sixth output port provided with sixth to ninth conductors, to which the
first and second analog left signals and the first and second analog right signals are applied to
the sixth to ninth conductors; When the audio jack having the first to third terminals is inserted
into the first output port, the first and second conductors are connected to the first terminal, and
the third and fourth conductors are connected to the second terminal. And the fifth conductor is
connected to the third terminal [Selected figure] Figure 2
Audio device and audio output port
[0001]
The techniques described below relate to audio devices and audio output ports.
[0002]
Conventional audio devices have only one output port.
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An audio jack into which a single-ended signal is input is inserted into the output port. This audio
jack has three terminals, and a single left signal, a single right signal, and a ground voltage are
respectively input to the three terminals through the output port.
[0003]
Recently, audio devices having additional output ports have been sold according to various
demands from consumers. An audio jack into which a differential signal is input is inserted into
the additional output port. This audio jack has four terminals, and the differential left signal and
the differential right signal are input to the four terminals through additional output ports,
respectively.
[0004]
Korean Published Patent No. 2015-0081710
[0005]
Accordingly, the present disclosure provides an audio device having an output port that outputs
a single signal and an output port that outputs a differential signal.
[0006]
Also, the present disclosure provides an audio device that reduces or eliminates the sound quality
degradation caused by the resistance component of the analog switch by removing some or all of
the analog switch located between the amplifier and the output port. is there.
[0007]
Also, the present disclosure provides an audio device with improved sound quality by increasing
the current drive capability to an audio jack into which a single signal is input.
[0008]
An audio device according to an embodiment receives an input of a digital left channel signal and
a digital right channel signal, and outputs an analog module outputting first and second analog
left signals and first and second analog right signals; A first output port comprising a fifth
conductor to which the first and second analog left signals, the first and second analog right
signals and the ground voltage are respectively applied to the first to fifth conductors; And a
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second output port to which the first and second analog left signals and the first and second
analog right signals are applied to the sixth to ninth conductors. When an audio jack having first
to third terminals is inserted into the first output port, the first and second conductors are
connected to the first terminal, and the third and fourth conductors are connected. Coupled to
said second terminal, said fifth conductor is connected to the third terminal.
[0009]
The audio output port according to an embodiment is an audio output port into which an audio
jack having first to third terminals is inserted, and the first audio output port is connected to the
first terminal when the audio jack is inserted. A conductor; a second conductor connected to the
first terminal when the audio jack is inserted; a third conductor connected to the second terminal
when the audio jack is inserted; the audio jack is inserted A fourth conductor coupled to the
second terminal; and a fifth conductor coupled to the third terminal when the audio jack is
inserted.
[0010]
Also, an audio apparatus according to an embodiment includes: a first output port into which a
first audio jack to which a single left signal, a single right signal, and a ground voltage are applied
is inserted; first and second differential left signals; A second output port into which a second
audio jack to which a first and second differential right signals are applied is inserted; whether or
not the first audio jack is inserted into the first output port; and the second output port into the
second output port A control unit that generates a control signal according to at least one of
whether the second audio jack is inserted; and digital-to-analog conversion and amplification of
the digital left channel signal to obtain a differential analog left signal and two single analog
signals. Outputting a signal selected by the control signal from among one analog left signal,
digital-to-analog converting the digital right channel signal, and And width, including an analog
module for outputting a signal selected by the control signal from the differential analog right
signal and two single analog right signal.
[0011]
The audio device according to the present disclosure has the advantage of being able to reduce
or eliminate the audio degradation caused by the resistive component of the analog switch by
removing some or all of the analog switch located between the amplifier and the output port. is
there.
[0012]
Also, the audio device according to the present disclosure has the advantage that the sound
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quality can be improved by increasing the current drive capability to the audio jack into which a
single signal is input.
[0013]
FIG. 1 is a view showing an audio apparatus according to a first embodiment of the present
invention.
FIG. 2 is a view showing an audio apparatus according to a second embodiment of the present
invention.
FIG. 3 is a view for explaining an example of an audio output port applicable to the first output
port of the audio apparatus according to the second embodiment shown in FIG.
FIG. 4 is a view for explaining another example of the audio output port applicable to the first
output port of the audio apparatus according to the second embodiment shown in FIG.
FIG. 5 is a view showing an audio apparatus according to a third embodiment of the present
invention.
[0014]
While the technology described below can be variously modified and can have various
embodiments, specific embodiments are illustrated and described in detail in the drawings.
However, this is not intended to limit the technology described below to a specific embodiment,
and is understood to include all modifications, equivalents, or alternatives included in the spirit
and technical scope of the technology described below. It should be.
[0015]
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Although the terms first, second, A, B, etc. may be used to describe various components, the
corresponding components are not limited by the terms, but merely for the purpose of
distinguishing one component from other components. Used only in
For example, the first component may be named as a second component without departing from
the scope of the technology described below, and likewise the second component may be named
as a first component.
The term "and / or" includes any and all combinations of one or more of the associated listed
items or any of the associated listed items.
[0016]
In the terms used herein, the singular term is to be understood as including the plural, unless the
context clearly indicates otherwise, the term "including" is a feature described. It is meant that
there are numbers, steps, acts, components, parts or combinations thereof, and one or more
other features or numbers, steps, acts, components, parts or It should be understood that it does
not exclude the presence or the possibility of combining these.
[0017]
Before the detailed description of the drawings, it should be clearly stated that the division to
each component in the present specification is merely divided into the function of the main
component that each component is in charge of.
That is, two or more components described below may be combined into one component, or one
component may be divided into two or more functions according to more subdivided functions.
Then, each of the components described below can additionally perform some or all of the
functions of other components in addition to the main function of which it is in charge. It is
needless to say that some of the main functions each of which is in charge may be exclusively
performed by other components.
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[0018]
Also, in carrying out the method or method of operation, each step of the method may occur out
of the order given, unless a specific order is explicitly stated in the context.
That is, each process may occur in a specified order, may be performed substantially
simultaneously, and may be performed in the opposite order.
[0019]
FIG. 1 is a view showing an audio apparatus according to a first embodiment. Referring to FIG. 1,
the audio apparatus includes an analog module 110, an analog switch 120, a first output port
130 and a second output port 140.
[0020]
The analog module 110 performs digital-analog conversion and amplification on the digital left
channel signal (L channel) and the digital right channel signal (R channel) to obtain differential
left signals (L +, L−) and differential right signals (R +, R-) is output. The analog switch 120 is an
output port selected by the control signal (Ctrl) among the first and second output ports 130,
140 for the differential left signal (L +, L-) and the differential right signal (R +, R-). To
communicate. When the control signal (Ctrl) corresponds to outputting to the first output port
130, the switches (121 to 124) are connected as indicated by solid lines in the drawing.
Therefore, a positive differential left signal (L +) and a positive differential right signal (R +) are
connected to the first output port 130. When the control signal (Ctrl) corresponds to output to
the second output port 140, the switches 121 to 124 are connected as indicated by dotted lines
in the drawing. Therefore, the differential left signal (L +, L−) and the differential right signal (R
+, R−) are connected to the second output port 140.
[0021]
The audio apparatus according to the first embodiment has the following problems. First, the
analog switch 120 may be implemented as a complementary metal-oxide semiconductor (CMOS)
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switch or the like, which causes the addition of a resistive component. The addition of the
resistance component causes the sound quality of the headphones or earphones connected to the
output ports 130, 140 to deteriorate. Second, when the control signal (Ctrl) corresponds to
output to the second output port 140, all outputs (L +, L-, R +, R-) of the analog module 110 are
connected to the second output port 140 Although it is used, when the control signal (Ctrl)
corresponds to output to the first output port 130, a part (L +, R +) of the outputs (L +, L-, R +, R-)
of the analog module 110 Is coupled to the first output port 130 and utilized, and the rest (L-, R-)
are not utilized. This can cause losses in terms of circuit and power efficiency.
[0022]
FIG. 2 is a view showing an audio apparatus according to a second embodiment. Referring to FIG.
2, the audio apparatus includes an analog module 210, a first output port 220, a second output
port 230, and a controller 240.
[0023]
The analog module 210 receives the digital left channel signal (L channel) and the digital right
channel signal (R channel), and receives the first and second analog left signals (L1, L2) and the
first and second analog right signals (R1). , R2). The analog module 210 outputs first and second
analog left signals (L1, L2) obtained by performing digital-analog conversion and amplification
on the digital left channel signal (L channel), and outputs the digital right channel signal (L The
first and second analog right signals (R1, R2) obtained by performing digital-to-analog
conversion and amplification for R channel) are output.
[0024]
The analog module 210 operates in a differential mode or a single-ended mode according to a
control signal (Ctrl). When the analog module 210 operates in the differential mode, the analog
module 210 operates with the first and second analog left signals (L1, L2) operating in the
differential mode and the first and second analog right signals operating in the differential mode
Output (R1, R2). One of the first and second analog left signals (L1, L2) operating in the
differential mode corresponds to a positive left signal, and the remaining one signal has an
opposite polarity to the positive left signal. It corresponds to a negative left signal. One of the
first and second analog right signals (R1, R2) operating in the differential mode corresponds to a
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positive right signal, and the remaining one signal has the opposite polarity to the positive right
signal. It corresponds to a negative right signal. When the analog module 210 operates in a
single mode, the analog module 210 operates with the first and second analog left signals (L1,
L2) operating in a single mode and the first and second analog right signals operating in a single
mode Output (R1, R2). The first and second analog left signals L1 and L2 operating in a single
mode correspond to a single left signal having the same polarity as each other. The first and
second analog right signals (R1, R2) operating in a single mode correspond to a single right
signal having the same polarity as one another.
[0025]
The analog module 210 comprises a digital to analog converter 211 and an amplifier 212. The
digital-to-analog converter 211 performs digital-to-analog conversion on the digital left channel
signal (L channel) and the digital right channel signal (R channel). The amplifier 212 outputs first
and second analog left signals (L1, L2) and first and second analog right signals (R1, R2)
obtained by performing amplification on the output of the digital-analog converter 211. Do.
[0026]
The analog-to-digital converter 211 may be embodied using two chips AK4375 sold by Asahi
Kasei Electronics as an example. When the analog module 210 operates in the differential mode,
the digital left channel signal (L channel) is input to the first input of the first AK 4375, and the
digital left channel signal (L channel) is inverted to the second input. Input the signal converted
to polarity. The digital right channel signal (R channel) is input to the first input terminal of the
second AK 4375, and a signal obtained by converting the digital right channel signal (R channel)
to the opposite polarity is input to the second input terminal. When the analog module 210
operates in the single mode, the digital left channel signal (L channel) is input to the first and
second inputs of the first AK 4375, and to the first and second inputs of the second AK 4375.
Input digital right channel signal (R channel).
[0027]
The first output port 220 includes first to fifth conductors C1 to C5. First and second analog left
signals (L1, L2), first and second analog right signals (R1, R2), and ground voltage (GND) are
applied to first to fifth conductors (C1 to C5), respectively Ru. When the first audio jack 250
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having the three terminals 251 is inserted into the first output port 220, the first and second
conductors C1 and C2 may be any one of the three terminals 251. , And the third and fourth
conductors (C3, C4) are connected to the second terminal, which is one of the other three
terminals 251, and the fifth conductor is connected to the first terminal. The third terminal 251
is connected to a third terminal, which is one of the remaining terminals. When the first audio
jack 250 is inserted into the first output port 220, the first conductor (C1) is directly connected
to the first terminal without passing through another conductor (eg, C2), and the second
conductor (C2) is directly connected to the first terminal without passing through another
conductor (eg, C1), and the third conductor (C3) is directly connected to the second terminal
without passing through another conductor (eg, C4) And the fourth conductor (C4) is directly
connected to the second terminal without passing through another conductor (e.g., C3). The first
audio jack 250 can have an additional terminal (an example: a terminal for a microphone, not
shown), and accordingly, the first output port 220 also has an additional conductor (not shown)
be able to.
[0028]
The second output port 230 includes sixth to ninth conductors C6 to C9. First and second analog
left signals (L1, L2) and first and second analog right signals (R1, R2) are applied to sixth to ninth
conductors (C6 to C9), respectively. When the second audio jack 260 having four terminals 261
to 264 is inserted into the second output port 230, the sixth to ninth conductors (C6 to C9) are
connected to the four terminals 261 to 264, respectively. Be done. Although the drawing shows
an example in which four terminals 261 to 264 are embodied in the form of four metal bars, if
one cylindrical metal bar is different from one another in the same manner as the first audio jack
250, Thus, four terminals 261 to 264 may be implemented.
[0029]
The control unit 240 detects whether the first audio jack 250 is inserted into the first output port
220, and outputs a control signal (Ctrl) corresponding thereto. When the first audio jack 250 is
inserted into the first output port 220, the control unit 240 controls the first and second analog
left signals L1 and L2 and the first and second analog right signals R1 and R2 to be single. The
analog module 210 is controlled to operate in one mode. Also, during at least a part of the period
in which the first audio jack 250 is not inserted into the first output port 220, the control unit
240 controls the first and second analog left signals L1 and L2 and the first and second analog
right signals. Control the signals (R1, R2) to operate in differential mode.
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[0030]
The first audio jack 250 is an audio jack to which a single left signal, a single right signal, and a
ground voltage (GND) are input through three terminals 251. The second audio jack 260 is an
audio jack to which a differential left signal is input through the first and second terminals 261
and 262 and a differential right signal is input through the third and fourth terminals 263 and
264.
[0031]
The analog module 210 outputs two single analog left signals L1 and L2 and two single analog
right signals R1 and R2 when the first audio jack 250 is inserted into the first output port 220. .
Two single analog left signals L1 and L2 are applied to the first terminal of the first audio jack
250 through the first and second conductors C1 and C2 of the first output port 220. Also, two
single analog right signals R1 and R2 are applied to the second terminal of the first audio jack
250 through the third and fourth conductors C3 and C4 of the first output port 220.
[0032]
The analog module 210 outputs the differential analog left signal (L1, L2) and the differential
analog right signal (R1, R2) during at least a part of the period when the first audio jack 250 is
not inserted into the first output port 220 Do. The differential analog left signal (L1, L2) and the
differential analog right signal (R1, R2) are transmitted through the sixth to ninth conductors (C6
to C9) of the second output port 230 to the first to the second audio jacks 260. The voltage is
applied to the fourth terminals 261-264. At this time, the differential analog left signal (L1, L2) is
also applied to the first and second conductors (C1, C2) of the first output port 220, but the first
and second conductors (C1, C2) ) Are not electrically connected to each other, no power
consumption occurs in the first and second conductors (C1, C2). The differential analog right
signal (R1, R2) is also applied to the third and fourth conductors (C3, C4) of the first output port
220, but the third and fourth conductors (C3, C4) Are not electrically connected to each other, no
power consumption occurs in the third and fourth conductors (C3, C4).
[0033]
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When the first audio jack 250 is inserted into the first output port 220 and the second audio jack
260 is inserted into the second output port 230, the analog module 210 outputs two single
analog left signals (L1, L2) and 2 Output a single analog right signal (R1, R2). Two single analog
left signals (L1, L2) are input to the first terminal of the first audio jack 250, and two single
analog right signals (R1, R2) are input to the second terminal of the first audio jack 250. Thus,
the first audio jack 250 operates normally. Also, two single analog left signals (L1, L2) are
respectively input to the first and second terminals 261, 262 of the second audio jack 260, and
two single analog right signals (R1, R2) are as The third and fourth terminals 263 and 264 of the
second audio jack 260 are respectively input. Since the two single analog left signals (L1, L2) are
substantially the same signal, no current flows between the first and second terminals 261, 262
of the second audio jack 260, thus unnecessary current Exhaustion can be prevented. Also, since
the two single analog right signals (R1, R2) are substantially the same signal, no current flows
between the third and fourth terminals 263, 264 of the second audio jack 260, and thus
unnecessary. Current consumption can be prevented.
[0034]
As described above, the audio apparatus according to the second embodiment connects any
analog switch between the output end of the amplifier 212 and the first to fourth and sixth to
ninth conductors (C1 to C4 and C6 to C9). It has not been. Therefore, the audio apparatus
according to the second embodiment can prevent the sound quality deterioration due to the
analog switch.
[0035]
Also, when the first audio jack 250 is connected to the first output port 220, the first and second
analog left signals (L1, L2) are applied to the first terminal of the first audio jack 250, and the
first audio jack The first and second analog right signals (R1, R2) are applied to the second
terminal 250. Therefore, the audio apparatus according to the second embodiment can supply
twice as much current to the first and second terminals of the first audio jack 250 as compared
with the first embodiment.
[0036]
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FIG. 3 is a view for explaining an example of the audio output port 310 applicable to the first
output port 220 of the audio apparatus according to the second embodiment. Referring to FIG. 3,
the audio output port includes a housing 311 and first to fifth conductors C <b> 1 to C <b> 5.
[0037]
The first and second conductors (C1, C2) are located on the same coordinate in the x-axis
direction, and the third and fourth conductors (C3, C4) are located on the same coordinate in the
x-axis direction. The first and second conductors (C1, C2) are not electrically connected to each
other. The third and fourth conductors (C3, C4) are not electrically connected to one another.
Among the first to fifth conductors (C1 to C5), each conductor has a depressed portion inside the
housing 311, and this portion contacts the audio jack 320.
[0038]
When the audio jack 320 is inserted into the audio output port 310, the first conductor (C1)
directly contacts the first terminal 321 without passing through another conductor (example:
C2), and the second conductor (C2) ) Directly contacts the first terminal 321 without passing
through another conductor (example: C1), and the third conductor (C3) directly contacts the
second terminal 322 without passing through another conductor (example: C4). , And the fourth
conductor (C4) directly contacts the second terminal 322 without passing through another
conductor (an example: C3), and the fifth conductor (C5) contacts the third terminal 323.
[0039]
When the audio jack 320 is inserted into the audio output port 310, two single analog left signals
are applied to the first and second conductors (C1, C2), and the third and fourth conductors (C3,.
Two single analog right signals are applied to C4) and a ground voltage is applied to the fifth
conductor (C5).
[0040]
Differential analog left signals are applied to the first and second conductors (C1, C2) during at
least a part of the period when the audio jack 320 is not inserted into the audio output port 310,
and the third and fourth conductors The differential analog right signal is applied to (C3, C4), and
the ground voltage is applied to the fifth conductor (C5).
[0041]
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FIG. 4 is a view for explaining another example of the audio output port 410 applicable to the
first output port 220 of the audio apparatus according to the second embodiment.
Referring to FIG. 4, the audio output port includes a housing 411 and first to fifth conductors C
<b> 1 to C <b> 5.
[0042]
The first and second conductors (C1, C2) are located on different coordinates in the x-axis
direction, and the third and fourth conductors (C3, C4) are located on different coordinates in the
x-axis direction.
The first and second conductors (C1, C2) are not electrically connected to each other.
The third and fourth conductors (C3, C4) are not electrically connected to one another. Among
the first to fifth conductors (C1 to C5), each conductor has a depressed portion inside the
housing 411, and this portion contacts the audio jack 420.
[0043]
When the audio jack 420 is inserted into the audio output port 410, the first conductor (C1)
directly contacts the first terminal 421 without passing through another conductor (example:
C2), and the second conductor (C2) ) Directly contacts the first terminal 421 without passing
through another conductor (example: C1), and the third conductor (C3) directly contacts the
second terminal 422 without passing through another conductor (example: C4). , And the fourth
conductor (C4) directly contacts the second terminal 422 without passing through another
conductor (example: C3), and the fifth conductor (C5) contacts the third terminal 423. When the
audio jack 420 is inserted into the audio output port 410, two single analog left signals are
applied to the first and second conductors (C1, C2), and the third and fourth conductors (C3,.
Two single analog right signals are applied to C4) and a ground voltage is applied to the fifth
conductor (C5).
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[0044]
The differential analog left signal is applied to the first and second conductors (C1, C2) during at
least a part of the period when the audio jack 420 is not inserted into the audio output port 410,
and the third and fourth conductors The differential analog right signal is applied to (C3, C4), and
the ground voltage is applied to the fifth conductor (C5).
[0045]
FIG. 5 is a view showing an audio apparatus according to a third embodiment.
Referring to FIG. 5, the audio apparatus includes an analog module 510, an analog switch 520, a
first output port 530, a second output port 540, and a controller 550.
[0046]
The analog module 510 receives the digital left channel signal (L channel) and the digital right
channel signal (R channel), and receives the first and second analog left signals (L1, L2) and the
first and second analog right signals (R1). , R2). The analog module 510 performs digital-analog
conversion and amplification on the digital left channel signal (L channel) and outputs first and
second analog left signals (L1, L2), and the digital right channel signal (R The first and second
analog right signals (R1, R2) obtained by performing digital-analog conversion and amplification
on the channel) are output. The first and second analog left signals (L1, L2) and the first and
second analog right signals (R1, R2) are output to the first to fourth lines.
[0047]
The analog module 510 operates in a differential mode or a single-ended mode according to a
control signal (Ctrl). When the analog module 510 operates in the differential mode, the analog
module 510 operates with the first and second analog left signals (L1, L2) operating in the
differential mode and the first and second analog right signals operating in the differential mode
Output (R1, R2). When the analog module 510 operates in a single mode, the analog module 510
operates with the first and second analog left signals (L1, L2) operating in a single mode and the
first and second analog right signals operating in a single mode Output (R1, R2).
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[0048]
The analog module 510 comprises a digital to analog converter 511 and an amplifier 512. The
digital-to-analog converter 511 performs digital-to-analog conversion on the digital left channel
signal (L channel) and the digital right channel signal (R channel). The amplifier 512 outputs first
and second analog left signals (L1, L2) and first and second analog right signals (R1, R2)
obtained by performing amplification on the output of the digital-analog converter 511. Do.
[0049]
The analog-to-digital converter 511 may be implemented using two chips AK4375 sold by Asahi
Kasei Electronics, as an example. When the analog module 510 operates in the differential mode,
the digital left channel signal (L channel) is input to the first input end of the first AK 4375, and
the digital left channel signal (L channel) is inverted to the second input end. Input the signal
converted to polarity. The digital right channel signal (R channel) is input to the first input
terminal of the second AK 4375, and a signal obtained by converting the digital right channel
signal (R channel) to the opposite polarity is input to the second input terminal. When the analog
module 510 operates in the single mode, the digital left channel signal (L channel) is input to the
first and second inputs of the first AK 4375, and to the first and second inputs of the second AK
4375. Input digital right channel signal (R channel).
[0050]
The analog switch 520 comprises a first switch 521 and a second switch 522. The first and
second wires to which the first and second analog left signals L1 and L2 are applied are
connected to the first conductor C1 via the first switch 521. Third and fourth wires to which the
first and second analog right signals R1 and R2 are applied are connected to the second
conductor C2 via the second switch 522. The first switch 521 connects all of the first and second
wires to the first conductor (C1) according to a control signal (Ctrl), or at least one of the first
and second wires is connected to the first conductor (C1). Cut off from). The second switch 522
connects all of the third and fourth wires to the second conductor (C2) according to a control
signal (Ctrl), or at least one of the third and fourth wires is connected to the second conductor
(C2). Cut off from).
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[0051]
The first output port 530 includes first to third conductors C1 to C3. Either the first and second
analog left signals (L1, L2) are applied to the first conductor (C1) by the operation of the first
switch 521, or the first and second analog left signals (L1, L2) And at least one signal is blocked.
Either the first and second analog right signals (R1, R2) are applied to the second conductor (C2)
by the operation of the second switch 522, or the first and second analog right signals (R1, R2)
And at least one signal is blocked. The ground voltage (GND) is applied to the third conductor
(C3). When the first audio jack 560 having the three terminals 561 is inserted into the first
output port 530, the first conductor (C1) may be any one of the three terminals 561. And the
second conductor (C2) is connected to the second terminal, which is one of the other three
terminals 561, and the third conductor (C3) is connected to the other one of the three terminals
561. It is connected to a third terminal which is one remaining terminal. The first audio jack 560
may have an additional terminal (an example: a terminal for a microphone, not shown), and
accordingly, the first output port 530 also has an additional conductor (not shown) be able to.
[0052]
The second output port 540 includes fourth to seventh conductors C4 to C7. First and second
analog left signals (L1, L2) and first and second analog right signals (R1, R2) are applied to the
fourth to seventh conductors (C4 to C7), respectively. When the second audio jack 570 having
four terminals 571 to 574 is inserted into the second output port 540, the fourth to seventh
conductors (C4 to C7) are connected to the four terminals 571 to 574, respectively. Be done.
Although the drawing shows an example in which four terminals 571 to 574 are embodied in the
form of four metal rods, one cylindrical metal rod is made to differ from one another in a similar
manner to the first audio jack 560. Four terminals may be embodied.
[0053]
The control unit 550 controls the control signal (Ctrl) according to at least one of whether the
first audio jack 560 is inserted in the first output port 530 and whether the second audio jack
570 is inserted in the second output port 540. Can be generated. As an example, when the first
audio jack 560 is inserted into the first output port 530, the controller 550 controls the analog
module 510 and the analog switch 520 to operate in a single mode, and the first audio jack 560
is inserted. The controller 550 may control the analog module 510 and the analog switch 520 to
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operate in the differential mode during at least a part of the non-period. In another example,
when the second audio jack 570 is inserted into the second output port 540, the controller 550
controls the analog module 510 and the analog switch 520 to operate in the differential mode,
and the second audio jack 570 is operated. The controller 550 may control the analog module
510 and the analog switch 520 to operate in the single mode during at least a part of the period
in which the H.sub.2 is not inserted. When operating in the single mode, the analog module 510
operates with the first and second analog left signals (L1, L2) operating in the single mode and
the first and second analog right signals (R1, Output R2). Also, when operating in the single
mode, the first switch 521 connects all of the first and second wires to the first conductor (C1),
and the second switch 522 changes all of the third and fourth wires 2 Connect with the
conductor (C2). When operating in the differential mode, the analog module 510 operates with
the first and second analog left signals (L 1, L 2) operating in the differential mode and the first
and second analog right signals (R 1, Output R2). In addition, when operating in the differential
mode, the first switch 521 blocks at least one of the first and second wires from the first
conductor (C1), and the second switch 522 performs the third and fourth operations. At least one
of the wires is disconnected from the second conductor (C2).
[0054]
The first audio jack 560 is an audio jack to which a single left signal, a single right signal, and a
ground voltage (GND) are input through three terminals 561. The second audio jack 570 is an
audio jack to which the differential left signal is input through the first and second terminals 571
and 572 and the differential right signal is input through the third and fourth terminals 573 and
574.
[0055]
When operating in single mode, the analog module 510 outputs two single analog left signals
(L1, L2) and two single analog right signals (R1, R2). The two single analog left signals L1 and L2
are all applied to the first terminal of the first audio jack 560 through the first conductor 521 of
the first switch 521 and the first output port 530. Also, two single analog right signals R1 and R2
are all applied to the second terminal of the first audio jack 560 through the second switch 522
and the second conductor C2 of the first output port 530.
[0056]
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When operating in single mode, two single analog left signals (L 1, L 2) and two single analog
right signals (R 1, R 2) are connected to the fourth to seventh conductors of the second output
port 540 ( C4 to C7). At this time, even if the second audio jack 570 is inserted into the second
output port 540, the first and second terminals 571 and 572 of the second audio jack 570 have
substantially the same single analog left signal (L1, L2). ), So that no current flows between the
first and second terminals 571 and 572. In addition, since the single analog right signals (R1 and
R2) substantially the same as each other are applied to the third and fourth terminals 573 and
574 of the second audio jack 570, between the third and fourth terminals 573 and 574 No
current flows to Therefore, unnecessary current consumption can be prevented.
[0057]
When operating in differential mode, the analog module 510 outputs differential analog left
signals (L1, L2) and differential analog right signals (R1, R2). The differential analog left signal
(L1, L2) and the differential analog right signal (R1, R2) are transmitted through the fourth to
seventh conductors (C4 to C7) of the second output port 540 to the first to the second audio
jacks 570. The voltage is applied to the fourth terminals 571 to 574.
[0058]
When operating in the differential mode, at least one of the first and second wires to which the
differential analog left signal (L1, L2) is applied is disconnected from the first conductor (C1) of
the first output port 530. At least one of the third and fourth lines to which the differential
analog right signal R1 or R2 is applied is disconnected from the second conductor C2 of the first
output port 530. If the first and second wires are disconnected from the first conductor (C1) of
the first output port 530 and the third and fourth wires are disconnected from the second
conductor (C2) of the first output port 530, Even if the first audio jack 560 is inserted into the
first output port 530, no current flows in the audio jack 560. Therefore, unnecessary current
consumption can be prevented.
[0059]
As described above, in the audio apparatus according to the third embodiment, any analog switch
is not connected between the output end of the amplifier 512 and the fourth to seventh
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conductors (C4 to C7). Therefore, the audio apparatus according to the third embodiment can
prevent the sound quality deterioration due to the analog switch.
[0060]
In addition, when the first audio jack 560 is connected to the first output port 530, the first and
second analog left signals (L1, L2) are applied to the first terminal of the first audio jack 560, and
the first audio jack The first and second analog right signals (R1, R2) are applied to the second
terminal 560. Therefore, the audio apparatus according to the third embodiment can supply
twice as much current to the first and second terminals of the first audio jack 560 as compared
with the first embodiment.
[0061]
The embodiments and the drawings attached to the present specification merely show a part of
the technical ideas included in the above-described techniques, and the techniques included in
the description and the drawings of the above-described techniques. All modifications and
specific embodiments that can be easily inferred by those skilled in the art within the scope of
the present invention can be said to be included within the scope of the aforementioned
technology.
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