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JP2009100414

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
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DESCRIPTION JP2009100414
An audio apparatus is configured to be able to detect whether a headphone or the like is
connected to a remote control. An audio apparatus and an external device are provided with a
first terminal unit 9 connectable to an audio device, a second terminal unit 11 connectable to an
external device, and an operation unit K1 for command input. In a remote control device
provided with signal terminals 9c and 9d for audio signal transmission between them, a
command terminal 9b for command transmission, and a ground terminal 9a, a signal connected
to the signal terminal and the ground terminal at the second terminal portion A terminal 11c,
11d, a ground terminal 11a, and a switch terminal 11b are provided, and when the switch
terminal is connected as an external device having a predetermined third terminal portion, the
third terminal portion shorts to the ground terminal. In the other case, the circuit is in the open
state, and between the ground terminal and the command terminal, different resistance values
are selected depending on the combination of the operation state of the operation unit and the
presence or absence of the short circuit. Vinegar resistance circuit R2~R4 provided. [Selected
figure] Figure 2
REMOTE CONTROL DEVICE, AUDIO DEVICE, AUDIO SYSTEM, CONTROL METHOD IN AUDIO
DEVICE, AND PROGRAM
[0001]
The present invention relates to a remote control device for inputting a command to an audio
device, an audio device corresponding to the remote control device, an audio system having the
remote control device and the audio device, a control method for the audio device, and the
control of the audio device. It relates to a program to carry out the method.
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1
[0002]
Conventionally, as a plug used for output to a stereo headphone, online input of a stereo audio
signal, etc., there are a standard 3-pole type plug and a 4-pole type plug.
In the 4-pole type, in addition to the ground and the left and right audio signals to which the 3pole type is connected, the other one pole is used to connect a signal line such as a remote
control. The four-pole type is widely used in wired remote control of portable audio equipment
and the like.
[0003]
FIG. 11 is a circuit diagram showing the main part of a conventional audio apparatus in which
such a four-pole plug can be used. In the figure, reference numeral 1 denotes a microcomputer
for controlling each part of the apparatus and various necessary information processing, and
reference numeral 2 denotes a 4-pole jack for line input to the audio apparatus. The 4-pole jack 2
has a GND terminal 2a connected to ground, a command terminal 2b connected to an ADIN
terminal for A / D conversion input to the microcomputer 1, and an R terminal connected to a
circuit for the right audio channel of the audio device. 2c, and an L terminal 2d connected to the
circuit for the left audio channel of the audio device. Between the power supply (Vdd) of the
device and the ADIN terminal of the microcomputer 1, a resistor R1 for dividing the power
supply voltage Vdd is provided. A 3-pole plug 3 or 4-pole plug 4 can be connected to the 4-pole
jack 2.
[0004]
FIG. 12 is a circuit diagram showing the configuration of a remote control that can be used for
the audio device of FIG. The remote control comprises a four-pole plug 5 which can be connected
to the four-pole jack 2 of the audio device. The four-pole plug 5 includes a GND terminal 5a
connected to each of the terminals 2a to 2d of the four-pole jack 2, a command terminal 5b, an R
terminal 5c, and an L terminal 5d. The GND terminal 5a is connected to the ground, and the
command terminal 5b is connected to the ground through a series circuit of the resistors R2 and
R3. Two terminals short-circuited by depression of the remote control key K1 are connected to
both ends of the resistor R3, respectively.
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[0005]
FIG. 13 shows four types of voltage values input to the ADIN terminal of the microcomputer 1 in
the configuration of FIG. 11 and states corresponding thereto. As shown in FIG. 13, in the
“unconnected” state in which connection to the 4-pole jack 2 is not performed, the power
supply voltage Vdd is input to the ADIN terminal. In the "remote control detection" state where
the 4-pole plug 5 of the remote control is connected to the 4-pole jack 2 and the remote control
key K1 is not depressed, the power supply voltage Vdd is the resistance R1 of the audio device
and the resistances R2 and R3 of the remote control The voltage Vdd × R23 / (R1 + R23), which
is the voltage divided in However, R23 is a resistance value which added the resistance value of
resistance R2 and R3, and R1 is a resistance value of resistance R1.
[0006]
In the state of "remote control detection (key pressed)" in which the 4-pole plug 5 of the remote
control is connected to the 4-pole jack 2 and the remote control key K1 is pressed, both ends of
the resistor R3 are shorted. And Vdd × R2 / (R1 + R2), which is a voltage divided by the resistor
R2. On the other hand, in the state of "no remote control & 3-pole plug" in which a normal 3-pole
plug is connected to 4-pole jack 2, GND terminal 2a and command terminal 2b of 4-pole jack 2
are shorted, and command terminal 2b is grounded Therefore, 0 [V] is input.
[0007]
Therefore, the microcomputer 1 refers to any of the states in the "state" column based on the
voltage value input to the ADIN terminal by referring to the correspondence between the
"voltage" column and the "state" column shown in FIG. It can be determined whether there is.
[0008]
FIG. 14 shows control by the microcomputer 1 which is possible when the 4-pole jack 2 is used
as a headphone terminal in the configuration of FIG.
As shown in FIG. 14, when the externally connected device connected to the four-pole jack 2 is a
“three-pole headphone” having a three-pole plug 3, as shown in FIG. Since V] is input, the
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microcomputer 1 can perform control to invalidate the output from the built-in speaker based on
this.
[0009]
When the externally connected device connected to the 4-pole jack 2 is a “4-pole remote
control headphone” having a remote control as shown in FIG. 12, Vdd × R23 / (R1 + R23) is
input to the ADIN terminal. On the basis of this, the microcomputer 1 can perform control to
invalidate the output from the built-in speaker. When the externally connected device connected
to the 4-pole jack 2 is “a remote control using only two of the four poles” as shown in FIG. 12,
Vdd × R23 / (R1 + R23) is input to the ADIN terminal. On the basis of this, the microcomputer 1
can perform control to make the output from the built-in speaker effective.
[0010]
When these external devices are headphones with remote control or remote control using only
two poles, the input voltage to the ADIN terminal is equal and they can not be distinguished. It
corresponds only to either case. However, since the resistance values of the resistors R2 and R3
in the remote control are different between the case of headphones with remote control and the
case of the remote control using only two poles, distinction can be made, in that case It can
respond to any case.
[0011]
On the other hand, when no externally connected device is connected, the power supply voltage
Vdd is input to the ADIN terminal, so that based on this, the microcomputer 1 can make the
output from the built-in speaker effective. In this manner, the microcomputer 1 can determine
the externally connected device according to the voltage value of the ADIN terminal, and control
whether the built-in speaker is enabled or disabled.
[0012]
FIG. 15 shows control by the microcomputer 1 which is possible when the 4-pole jack 2 is used
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as a microphone terminal in the configuration of FIG. As shown in FIG. 15, in this case as well as
in the case of FIG. 14, the microcomputer 1 uses the "three-pole microphone" as the externally
connected device connected to the four-pole jack 2 according to the voltage value of the ADIN
terminal. It is possible to determine whether the "microphone with remote control with 4 poles",
"remote control using only 2 poles among 4 poles", or "not connected", and to control whether
the built-in microphone is enabled or disabled.
[0013]
Also in this case, it is not possible to distinguish between the case where the externally connected
device is a microphone with a remote control having a four-pole plug and the case where it is a
remote control using only two poles out of four. It corresponds only to either case. However, also
in this case, the resistance values of the resistors R2 and R3 in the remote control can be coped
with in both cases by setting different values for the microphone with remote control and the
remote control using only two poles.
[0014]
As an audio apparatus which can selectively connect any of headphones with a remote control
having a four-pole plug and headphones without a remote control having a three-pole plug, the
one described in Patent Document 1 is also known. ing.
[0015]
JP-A-4-316299
[0016]
However, according to the prior art shown in FIG. 11, a 3-pole jack is further provided for a
remote control using only two poles, and a headphone or an external microphone can be
connected to the 3-pole jack. Although it becomes possible to use the remote controller and the
headphone or the microphone together, there is a problem that it is not possible to detect
whether the headphone or the external microphone is connected to the three-pole jack.
[0017]
That is, when the remote control using only two poles is connected to the audio apparatus, the
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built-in speaker or built-in microphone is not invalidated as shown in FIG. 14 and FIG.
Then, even if a 3-pole jack is provided to the remote control and a headphone or a microphone is
connected, the microcomputer 1 can not detect that.
For this reason, when a headphone or a microphone is connected to such a remote control, the
built-in speaker or the microphone can not be automatically turned off.
As a result, a three-pole jack can not be provided substantially for a remote control using only
two poles. This limits the function of the audio device when both the remote control terminal and
the headphone or microphone terminal can not be provided to the audio device main body due to
size and cost constraints.
[0018]
SUMMARY OF THE INVENTION It is an object of the present invention to enable an audio
apparatus to detect whether a headphone or a microphone is connected to a remote control
using only two poles, in view of the problems of the prior art. It is in.
[0019]
In order to achieve this object, a device according to a first aspect of the invention comprises a
first terminal portion used for connection to a predetermined audio device, a second terminal
portion used for connection to an external device, and the audio device An operation unit for
inputting a command to the device, the first terminal unit including a signal terminal for
transmitting an audio signal between the audio device and an external device, a command
terminal for transmitting the command, and a ground terminal; The two-terminal unit includes a
signal terminal and a ground terminal connected to the signal terminal and the ground terminal,
and a switch terminal, and the switch terminal is connected to one having a predetermined third
terminal unit as the external device. The third terminal section short-circuits to the ground
terminal, otherwise it is in an open state, and between the ground terminal and the command
terminal, the operation state of the operation section Characterized by comprising a resistor
circuit showing a different resistance value depending on the combination of the presence or
absence of a short circuit.
[0020]
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6
Here, as the remote control device, for example, the one shown in FIG. 2 described later
corresponds.
As the first terminal portion, the second terminal portion, and the third terminal portion, for
example, the four-pole plug 9, the four-pole jack 11, and the three-pole plug 10 in FIG.
As a resistance circuit, what is shown, for example to below-mentioned FIG. 4 (a) and (b)
corresponds. As the resistance value which varies depending on the combination of the operation
state of the operation unit and the presence or absence of the short circuit, for example, R234,
R24, R23 and R2 in FIG. 3 described later and (R2 + 3), R3 and (R2 + R34 in FIG. And R34 apply.
[0021]
In this configuration, when the first terminal unit is connected to the audio apparatus and the
third terminal unit is not connected to the second terminal unit, the switch terminal is in the
open state, and the resistance circuit is in the open state. The resistance value corresponding to
the operation state of the operation part in. When the audio device detects this resistance value,
it can perform control when the external device having the third terminal portion is not
connected to the remote control. When the first terminal unit is connected to the audio device
and the third terminal unit is connected to the second terminal unit, the switch terminal is in the
short-circuited state, and the resistance circuit is operated in the shorted state. Indicates the
resistance value corresponding to the operation state. When the audio device detects this
resistance value, it can perform control in the case where an external device having the third
terminal portion is connected to the remote control.
[0022]
A remote control device according to a second aspect of the present invention is the remote
control device according to the first aspect, wherein the first terminal portion and the second
terminal portion are four pole terminals, the third terminal portion is a three pole terminal, and
the third terminal portion is And a ground terminal for shorting between the ground terminal
and the switch terminal in the second terminal part when connected to the second terminal part.
[0023]
An audio apparatus according to a third aspect of the present invention has a signal terminal, a
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command terminal, and a ground terminal respectively corresponding to the signal terminal, the
command terminal, and the ground terminal of the first terminal portion in the remote control
device according to the first or second aspect. For each voltage value that can be input to the
connection terminal unit, a resistor provided between the power supply of the device and the
command terminal of the connection terminal unit, acquisition means for acquiring the voltage
value of the command terminal, and Among control of a predetermined device, the control device
is characterized by further comprising control means for performing a control corresponding to
the voltage value acquired by the acquisition means.
[0024]
An audio apparatus according to a fourth aspect of the present invention is the audio terminal
according to the third aspect, wherein the control means is a control corresponding to the
voltage value when the voltage value acquired by the acquisition means is a ground potential.
Control necessary to use an external device that is supposed to be directly connected to the
device, and the voltage value acquired by the acquisition means is not short circuited between
the command terminal and the ground terminal in the remote control device If the value
corresponds to the case, control is performed so that the external device is not used, and if the
voltage value acquired by the acquisition unit is a value corresponding to the case where the
short circuit occurs, It is characterized by performing control necessary for using an external
device assumed to be connected via a remote control device.
[0025]
An audio apparatus according to a fifth aspect of the present invention is the audio terminal
according to the third aspect, wherein the control means is a control corresponding to the
voltage value when the voltage value acquired by the acquisition means is the ground potential.
Control is performed such that the input / output impedance or the input / output level in the
first unit becomes a predetermined first state, and the voltage value acquired by the acquisition
unit does not cause a short circuit between the command terminal and the ground terminal in the
remote control device Control is performed so that the input / output impedance or input /
output level at the connection terminal portion is in a predetermined second state, and the
voltage value acquired by the acquisition unit is the short circuit. If it is a value corresponding to
the occurrence, the input / output impedance or the input / output level at the connection
terminal portion becomes the first state. And performing Do control.
[0026]
An audio apparatus according to a sixth aspect of the present invention is the audio terminal
according to the third aspect, wherein the control means is a control corresponding to the
voltage value when the voltage value acquired by the acquisition means is the ground potential.
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Control to output an audio signal by stereo, and the voltage value acquired by the acquisition
means is a value corresponding to the case where a short circuit does not occur between the
command terminal and the ground terminal in the remote control device. Performs control to
output an audio signal in monaural from the connection terminal unit, and the voltage value
acquired by the acquisition unit is a value corresponding to a case where the short circuit occurs.
A control is performed to output an audio signal in stereo from the terminal unit.
[0027]
An audio system according to a seventh invention comprises the remote control device according
to the first or second invention and the audio device according to any one of the third to sixth
inventions.
[0028]
According to an eighth aspect of the present invention, there is provided a control method of an
audio apparatus, wherein a signal terminal, a command terminal and a ground terminal
respectively corresponding to the signal terminal, the command terminal and the ground
terminal of the first terminal portion in the remote control device according to the first and
second aspects. A control method in an audio apparatus comprising: a connection terminal
section having: a power source of the audio apparatus; and a resistor provided between
command terminals of the connection terminal section, an acquisition step of acquiring a voltage
value of the command terminal; A control step of performing control corresponding to the
voltage value acquired in the acquisition step among each control for the device predetermined
for each voltage value that can be input to the command terminal; .
[0029]
A program according to a ninth aspect of the present invention is a connection terminal having a
signal terminal, a command terminal and a ground terminal respectively corresponding to the
signal terminal, the command terminal and the ground terminal of the first terminal portion in
the remote control device according to the first or second invention. An acquisition procedure for
acquiring a voltage value of the command terminal to an audio apparatus comprising a unit, a
power supply of the audio apparatus, and a resistor provided between the command terminals of
the connection terminal unit, and each of which may be input to the command terminal Among
control of each of the predetermined devices with respect to the voltage value, a control
procedure for performing one corresponding to the voltage value acquired in the acquisition step
is executed.
[0030]
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9
According to the present invention, in the remote control device, the signal terminal and the
ground terminal connected to the signal terminal and the ground terminal of the first terminal
portion, and the second terminal portion provided with the switch terminal are provided. Shortcircuited to the ground terminal by the third terminal when connected with one having the third
terminal, and open otherwise, and the operation between the ground terminal and the command
terminal is performed. Since the resistance circuit showing different resistance values is provided
according to the combination of the operation state of the unit and the presence or absence of
the short circuit, the audio device can check the presence or absence of connection of the
external device to the remote control device based on the resistance value. It can be detected.
[0031]
Further, in the audio apparatus, the control means is provided to perform, among the control for
the apparatus predetermined for each voltage value that can be input to the command terminal,
the control corresponding to the voltage value input to the command terminal. When the first
terminal portion of the remote control device is connected to the connection terminal portion,
whether or not an external device having a third terminal portion is further connected to the
remote control device is detected as a voltage value of the command terminal, Control can be
performed according to the presence or absence of the connection of the external device.
[0032]
FIG. 1 is a circuit diagram showing the main part of an audio apparatus according to an
embodiment of the present invention.
As shown in the figure, the audio apparatus includes a microcomputer 1 for controlling each part
of the apparatus and various necessary information processing, a 4-pole jack 2 for line input, a
microphone 7 built in the apparatus body, and an audio circuit of an audio apparatus. Input
selector 8 for switching the input to the 4-pole jack 2 and the microphone 7, and between the
ADIN terminal for A / D conversion input of the microcomputer 1 and the power supply (Vdd) of
the device to divide the power supply voltage Vdd It has a resistance R1 for pressing.
The microphone 7 is configured by the microphones 7L and 7R for the left and right channels.
[0033]
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The 4-pole jack 2 has a GND terminal 2a connected to the ground, a command terminal 2b
connected to the ADIN terminal of the microcomputer 1, and an R terminal 2c for the right audio
channel connected to the input selector 8 and a left audio channel. An L terminal 2d is provided.
A 3-pole plug 3 or 4-pole plug 4 can be connected to the 4-pole jack 2.
When the 4-pole plug 4 is connected, each 4-pole is connected to the terminals 2 a to 2 d of the
4-pole jack 2.
When the three-pole plug 3 is connected, the command terminal 2b of the four-pole jack 2 is
connected to the GND terminal 2a and is in a grounded state.
[0034]
The input selector 8 has a first switch for switching the input to the circuit for the right audio
channel of the audio device between the R terminal 2c of the 4-pole jack 2 and the microphone
7R, and 4 poles for the input to the circuit for the right audio channel of the audio device. A
second switch is provided to switch between the L terminal 2d of the jack 2 and the microphone
7L.
The control of the input selector 8 is performed by the microcomputer 1 based on the input
voltage to its ADIN terminal.
The microcomputer 1 controls each part of the apparatus based on a built-in program.
For example, based on the input voltage to the ADIN terminal, control the input or output
impedance or input or output level in the 4-pole jack 2, output the audio signal from the 4-pole
jack 2 in monaural or in stereo Control can be performed.
[0035]
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11
FIG. 2 is a circuit diagram showing the configuration of a remote control that can be used for the
audio device of FIG.
The remote control comprises a four-pole plug 9 connectable to the four-pole jack 2 of the audio
device, a four-pole jack 11 connectable to the three-pole plug 10, and a remote control key K1.
This remote control is for selectively inputting ON / OFF binary values to the audio apparatus by
the remote control key K1. The user can use the remote control key K1 to instruct, for example,
the audio device to start and stop recording.
[0036]
The four-pole plug 9 includes a GND terminal 9 a connected to each of the terminals 2 a to 2 d of
the four-pole jack 2, a command terminal 9 b, an R terminal 9 c, and an L terminal 9 d. The GND
terminal 9a is connected to the ground. The command terminal 9b is connected to the ground via
a series circuit of resistors R2, R3 and R4. Two terminals of the remote control key K1 are
connected to both ends of the resistor R3, respectively, and both ends of the resistor R3 are
shorted when the remote control key K1 is pressed.
[0037]
The four-pole jack 11 has a GND terminal 11a connected to ground, a switch terminal 11b
connected to a connection point between the resistors R3 and R4, an R terminal 11c connected
to the R terminal 9c of the four-pole plug 9, and a four-pole plug An L terminal 11d connected to
an L terminal 9d of 9 is provided. The three-pole plug 10 is for line input, and is connected to an
external microphone or headphones. The three-pole plug 10 has a GND terminal 10a for ground,
an R terminal 10c for the right audio channel, and an L terminal 10d for the left audio channel.
When connected to the four-pole jack 9, the GND terminal 10a functions as a switch that
connects the terminals 11a and 11b and shorts both ends of the resistor R4.
[0038]
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FIG. 3 shows an example of control of the selector 8 by the microcomputer 1. In the table of the
figure, six types of voltage values input to the ADIN terminal of the microcomputer 1 are shown
in the "voltage" column. The state related to the 4-pole jack 2 corresponding to these voltage
values is shown in the "state" column, and the selector position of the corresponding input
selector 8 is shown in the "selector position" column. As shown in the figure, the power supply
voltage Vdd is input to the ADIN terminal in the "unconnected" state where nothing is connected
to the 4-pole jack 2. Based on this, the microcomputer 1 selects the microphone 7 which is a
"built-in microphone" as an input to the audio circuit by the selector 8, and makes the
microphone 7 capable of recording.
[0039]
On the other hand, in the "remote control insertion" state in which the remote control is
connected to the audio apparatus without the 3-pole plug 10 being connected and the remote
control key K1 is not pressed, the power supply voltage Vdd is connected to the resistor R1, the
resistors R2 and R3, and A voltage value Vdd × R234 / (R1 + R234) divided with R4 is input to
the ADIN terminal. Here, R234 is the sum of the resistances R2, R3 and R4 of the resistors R2, R3
and R4, and R1 is the resistance of the resistor R1. The microcomputer 1 selects the microphone
7 based on this voltage value.
[0040]
In this state, in the state of "remote control insertion (key depression)" when remote control key
K1 is pressed, both ends of resistor R3 are shorted, so the power supply voltage Vdd is divided
by resistor R1 and resistors R2 and R4. The compressed voltage value Vdd × R24 / (R1 + R24) is
input to the ADIN terminal. Here, R24 is the sum of the resistances R2 and R4 of the resistors R2
and R4. Based on this voltage value, the microcomputer 1 maintains the selection of the
microphone 7, interprets this voltage value as an instruction to start recording, and starts
recording based on the audio signal from the microphone 7. When the depression of the remote
control key K1 is released, the recording is stopped, and the state of "remote control inserted"
before the start of the recording is returned.
[0041]
Further, in the case of "remote control & line input detection" in which the remote control to
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which the three-pole plug 10 is connected is connected to the audio apparatus and the remote
control key K1 is not pressed, both ends of the resistor R4 are short-circuited. A voltage value
Vdd × R23 / (R1 + R23), which is a voltage value obtained by dividing the voltage Vdd by the
resistor R1 and the resistors R2 and R3, is input to the ADIN terminal. Here, R23 is the sum of
the resistances R2 and R3 of the resistors R2 and R3. Based on this voltage value, the
microcomputer 1 selects the line input from the 4-pole jack 2 by means of the selector 8 to
enable recording using an external microphone.
[0042]
In this state, in the state of "remote control & line input detection (key depression)" in which
remote control key K1 is pressed, the voltage value of the power supply voltage Vdd divided by
resistor R1 and resistor R2 is Vdd x R2 / ( R1 + R2) is input to the ADIN pin. Based on this, the
microcomputer 1 maintains the selection of the line input, interprets the input of the voltage
value as an instruction to start recording, and starts recording based on the audio signal from the
external microphone. When the depression of the remote control key K1 is released, the
recording is stopped, and the state of "remote control & line input detection" before the start of
the recording is returned.
[0043]
On the other hand, in the state of "3-pole plug (without remote control)" in which the normal 3pole plug 3 connected to the external microphone is directly connected to the 4-pole jack 2 of
the audio device, the terminal 2b of the 4-pole jack 2 is grounded And 0 [V] is input to the ADIN
terminal. Based on this, the microcomputer 1 selects the line input through the 4-pole jack 2 and
makes it possible to record using an external microphone.
[0044]
According to the present embodiment, in the remote controller, since the resistor R4 shorted
when the 3-pole plug 10 is connected to the 4-pole jack 11 is provided between the resistor R3
for detecting remote control key press detection and the ground, the microcomputer 1 The
presence or absence of connection of the three-pole plug 10 to the remote controller can be
detected based on the input voltage of the ADIN terminal which changes due to the short circuit
of R4. Therefore, with a simple configuration, the audio device can detect the presence or
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absence of connection of the three-pole plug 10 to the remote control, and appropriately control
which one of the built-in microphone or the external microphone connected to the three-pole
plug 10 is used. .
[0045]
FIG. 4 is a circuit diagram showing main parts of a remote control according to another
embodiment in comparison with main parts of the remote control shown in FIG. FIG. 4A shows
the main part of the remote control of FIG. 2 described above, and the main part of the
embodiment corresponding to this is shown in FIG. 4B. The remote control of FIG. 2 includes the
remote control key K1 for shorting the resistor R3 in the series circuit of the resistors R2, R3 and
R4 and the switch S1 for shorting the resistor R4 as shown in FIG. 4A. However, the switch S 1 is
configured by the GND terminal 11 a and the terminal 11 b of the four-pole jack 11 and the
terminal 10 a of the three-pole plug 10.
[0046]
On the other hand, in the remote control of FIG. 4B, the resistor R4 is connected in parallel to the
resistor R3 and the remote control key K1 is provided in parallel to the resistor R2, and the
switch S1 is further connected to the resistor R4 and the ground It is made to provide between.
The other configuration is the same as that of the remote control of FIG.
[0047]
FIG. 5 shows an example of control by the microcomputer 1 when the remote control of FIG. 4B
is used for the audio apparatus of FIG. However, here, the case where a headphone or a
microphone is connected as an externally connected device is described. The contents of the
"state" column, the "voltage" column, and the "built-in speaker (microphone)" column in FIG. 5 are
the same as the contents of the "state" column, the "voltage" column, and the "selector position"
column in FIG. It corresponds. That is, even when the remote control of FIG. 4B is used, similar
control can be performed as to whether or not the externally connected device is used based on
the voltage value of the ADIN terminal. Only the voltage value of the ADIN terminal, which is the
basis of control, differs from that of the remote control of FIG. 4 (a).
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[0048]
That is, in the state of "main body jack open (not connected)" in which nothing is connected to
the 4-pole jack 2, the power supply voltage Vdd is input to the ADIN terminal. Based on this, the
microcomputer 1 validates the built-in speaker or built-in microphone as an output from the
audio circuit or an input to the audio circuit, and enables an output from the built-in speaker or
an input from the built-in microphone.
[0049]
When the remote control is connected to the audio device without the 3-pole plug 10 being
connected and the remote control key K1 is not pressed, the power supply voltage Vdd is divided
by the resistor R1 and the resistors R2 and R3 in the "with remote control" state. The compressed
voltage value Vdd × (R2 + R3) / (R1 + R2 + R3) is input to the ADIN terminal. However, R1, R2,
and R3 are each resistance value of resistance R1, R2, and R3. The microcomputer 1 makes the
built-in speaker or the built-in microphone effective based on this voltage value.
[0050]
In this state, in the state of "with remote control (key pressed)" when remote control key K1 is
pressed, both ends of resistor R2 are shorted. Therefore, a voltage obtained by dividing power
supply voltage Vdd by resistors R1 and R3 The value Vdd × R3 / (R1 + R3) is input to the ADIN
terminal. Based on this voltage value, the microcomputer 1 maintains the effectiveness of the
built-in speaker or built-in microphone, interprets this voltage value as an instruction to start
reproduction or recording, and outputs the reproduced sound from the built-in speaker or from
the built-in microphone Start recording. When the depression of the remote control key K1 is
released, the reproduction or the recording is stopped, and the state of "with remote control" is
returned.
[0051]
Further, in the case of "with remote control & 3-pole plug" in which the remote control to which
the 3-pole plug 10 is connected is connected to the audio device and the remote control key K1
is not pressed, the switch S1 is turned on. A voltage value of Vdd × (R2 + R34) / (R1 + R2 +
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R34), which is a voltage value divided by the resistor R1 and the resistors R2, R3 and R4, is input
to the ADIN terminal. However, R34 is the resistance value by the parallel circuit of resistance R3
and R4. Based on this voltage value, the microcomputer 1 invalidates the built-in speaker or
built-in microphone, and enables output or recording by the headphone or microphone
connected to the three-pole plug 10.
[0052]
In this state, in the state of "remote control & 3-pole plug present (key pressed)" when remote
control key K1 is pressed, the voltage value Vdd x R34 which is a voltage value obtained by
dividing power supply voltage Vdd by resistor R1 and resistors R3 and R4. / (R1 + R34) is input
to the ADIN terminal. Based on this, the microcomputer 1 maintains the invalidation of the builtin speaker or built-in microphone, interprets the input of the voltage value as an instruction to
start reproduction or recording, and outputs the reproduced sound from the headphone or the
external microphone Start recording based on the audio signal. When the pressing of the remote
control key K1 is released, playback or recording is stopped, and the state of "remote control &
3-pole plug present" is returned.
[0053]
On the other hand, in the state of "no remote control (direct three-pole plug)" in which the
normal three-pole plug 3 connected to the headphone or external microphone is directly
connected to the four-pole jack 2 of the audio device, the command terminal of the four-pole jack
2 2b is grounded and 0 [V] is input to the ADIN terminal. On the basis of this, the microcomputer
1 invalidates the built-in speaker or built-in microphone, and makes it possible to output or
record sound using a headphone or an external microphone.
[0054]
According to the present embodiment, since the resistor R4 is provided in the remote control to
form a parallel circuit with the resistor R3 when the three-pole plug 10 is connected to the fourpole jack 11, the microcomputer 1 changes due to a short circuit of the resistor R4. The presence
or absence of connection of the three-pole plug 10 to the remote controller can be detected
based on the input voltage of the ADIN terminal. Therefore, with the simple configuration, the
audio apparatus can detect the presence or absence of connection of the three-pole plug 10 to
10-05-2019
17
the remote control, and appropriately control whether the built-in speaker or built-in microphone
is to be enabled or disabled.
[0055]
In the above-mentioned embodiment, when it is detected that an external microphone or
headphone is connected to the 4-pole jack 11 of the remote control, an embodiment which
enables disabling the built-in microphone or the built-in speaker will be described. However, the
function of detecting the presence or absence of connection to such a remote control can also be
applied for other purposes. For example, based on the detection result of the presence / absence
of connection of the external microphone, it is possible to perform display such that the user can
recognize which of the built-in microphone and the external microphone is enabled.
[0056]
In addition, when a four-pole plug whose terminal corresponding to the terminal 11b of the fourpole jack 11 is opened is connected to the remote control, the switch S1 shown in FIG. It can be
distinguished from the case where the plug 10 is connected. It is also possible to distinguish the
products connected to the 4-pole jack 11 by utilizing this point, and to set the operation mode
suitable for each. For example, although it is assumed that a commercially available three-pole
type microphone or headphone is connected to the four-pole jack 11 in the above embodiment, a
dedicated cable or four-pole plug is additionally provided to these. Assuming that headphones
are connected, the output impedance, the output voltage, etc. should be switched to ones suitable
for the remote control depending on whether a commercially available product or a dedicated
product is connected. it can.
[0057]
FIG. 6 shows the configuration of an adapter connectable to the 4-pole jack 11 of the remote
control. This adapter enables the 4-pole jack 11 of the remote control to double as an output to
headphones and a line output as a terminal for output from the audio device. That is, this adapter
includes a four-pole plug 61 connectable to the four-pole jack 11 and a three-pole jack 62 for
line output, and is used when the output from the four-pole jack 11 is used as a line output.
When outputting from the four-pole jack 11 to the headphone, the three-pole plug of the
headphone is directly connected to the four-pole jack 11 without using this adapter.
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18
[0058]
The four-pole plug 61 includes terminals 61 a to 61 d connected to the terminals 11 a to 11 d of
the four-pole jack 11 when connecting to the four-pole jack 11. The three pole jack 62 includes
terminals 62a, 62c and 62d connected to the terminals 61a, 61c and 61d of the four pole plug
61, respectively. The terminal 61b of the four-pole plug 61 remains open. Therefore, when the
remote control is connected to the audio device, the microcomputer 1 can distinguish the case
where the adapter of FIG. 6 is connected to the remote control from the case where the usual
three-pole plug is connected to the remote control it can. However, when the adapter of FIG. 6 is
connected to the remote control or when nothing is connected, no distinction is made because
the switch S1 (FIG. 4) of the remote control is in the OFF state.
[0059]
The microcomputer 1 distinguishes the case where the normal three-pole plug 10 is connected to
the remote control connected to the audio device and the case where the adapter of FIG. 6 is
connected, and the output impedance and the output according to each case. Switch the voltage.
Therefore, when the headphone having the three-pole plug 10 is connected to the remote
control, and the adapter of FIG. 6 is the line output connected to the remote control, an
appropriate output impedance or output voltage can be set. . Therefore, the adapter shown in
FIG. 6 can make it possible to combine the output via the remote control of the audio device with
the output to a normal headphone and the line output via the adapter or the output to a
dedicated headphone. .
[0060]
7 shows each state related to the 4-pole jack 2 when the audio signal is output from the 4-pole
jack 2 in the configuration provided with the audio device of FIG. 1, the remote control of FIG. 2
and the adapter of FIG. In response, the output mode adopted by the microcomputer 1 is shown.
The contents of the "state" column in FIG. 7 are the same as the contents of the "state" column in
FIG. However, the state of "with remote control" and "with remote control (key pressed)" includes
the case where the adapter of FIG. 6 is connected to the remote control. In the "Output mode"
column, the output impedance or output level of the audio signal is made "line output" for line
output, or "headphone output for normal headphone output, corresponding to each state in the"
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19
state "column. Show what The voltage of the ADIN terminal corresponding to each state in the
"state" column is the same as in the case of FIG. 3 or FIG. Therefore, also in this case, the
microcomputer 1 can identify each state based on the voltage of the ADIN terminal, and set the
output mode to "line output" or "headphone output". In the “line output” mode, the outputs of
the left and right channels are set to be output levels and output impedances suitable for line
output. In the “headphone output” mode, the outputs of the left and right channels are set to
be output levels and output impedance suitable for headphones.
[0061]
That is, as shown in FIG. 7, the remote control of FIG. 2 is connected to the state of “main body
jack open (not connected)” in which nothing is connected to the jack 2 of the audio device, and
In the state of "with remote control" and "without remote control (key pressed)" when the remote
control key K1 is pressed and not pressed, the microcomputer 1 sets the output mode to "line
output". However, in the state of "with remote control" and "with remote control (key pressed)",
the adapter of Fig. 6 is connected to the remote control, and the 3-pole plug for line output is
connected to the adapter. Is included.
[0062]
On the other hand, the remote control of FIG. 2 is connected to the 4-pole jack 2, a normal 3-pole
plug is connected to this remote control, and the remote control key K1 is pressed and not
pressed. In the state of remote control & 3-pole plug present (key pressed) and in the state of "no
remote control (direct 3-pole plug)" in which a normal 3-pole plug is directly connected to 4-pole
jack 2, microcomputer 1 is Set the output mode to "Headphones output".
[0063]
8 shows an example of control by the microcomputer 1 when an audio signal is input from the 4pole jack 2 in the configuration provided with the audio apparatus of FIG. 1, the remote control
of FIG. 2 and the adapter of FIG.
The contents of the "state" column in the figure are the same as the contents of the "state"
column in FIG. The "input" column indicates whether the microcomputer 1 uses the built-in
microphone or the line input according to the contents of the "state" column.
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20
[0064]
2 is connected to the 4-pole jack 2, and the remote control key K1 is pressed. In the case of "with
remote control" and "without remote control (key pressed)", the microcomputer 1 adopts the
input from the microphone and controls the device so that the input impedance and input level
suitable for it are obtained. Do. However, in the state of "with remote control" and "with remote
control (key pressed)", the adapter of Fig. 6 is connected to the remote control, and the 3-pole
plug for line input is connected to the adapter. Is included.
[0065]
On the other hand, the remote control of FIG. 2 is connected to the 4-pole jack 2, a normal 3-pole
plug is connected to this, and the remote control key K1 is pressed and not pressed. In the case
of “with 3-pole plug (key pressed)” and “without remote control (direct 3-pole plug)” in
which a normal 3-pole plug is directly connected to 4-pole jack 2, microcomputer 1 is a line
Adopt an input and control the device to have an appropriate input impedance and input level.
[0066]
FIG. 9 shows a configuration of an adapter for converting stereo output into monaural output as
another example of the adapter connected to the remote control of FIG.
This adapter comprises a four-pole plug 91 connectable to the four-pole jack 11 of the remote
control and a jack 92 for monaural output. The four-pole plug 91 includes terminals 91 a to 19 d
connected to the terminals 11 a to 11 d of the four-pole jack 11 when connecting to the fourpole jack 11. The jack 92 includes GND terminals 92 a and signal terminals 92 d connected to
the terminals 91 a and 91 d of the four-pole plug 91, respectively. The terminals 91b and 91c of
the 4-pole jack 91 remain open. Therefore, the microcomputer 1 to which the remote control of
FIG. 2 is connected can distinguish the case where the adapter of FIG. 9 is connected from the
case where a normal three-pole plug is connected to the remote control. However, when the
adapter of FIG. 9 is connected to the remote control or when nothing is connected, the switch S1
is in the OFF state (FIG. 4) in both cases, and no distinction is made.
[0067]
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21
10 shows an example of control by the microcomputer 1 in the case where an audio signal is
output from the 4-pole jack 2 in the configuration provided with the audio apparatus of FIG. 1,
the remote control of FIG. 2 and the adapter of FIG. The contents of the "state" column in the
figure are the same as the contents of the "state" column in Figs. 7 and 8. The state of "with
remote control" and "with remote control (key pressed)" includes the case where the adapter of
FIG. 9 is connected to the remote control. The "output mode" column indicates whether the
output of the audio signal is only monaural from the L terminal 2a or stereo from the L terminal
2a and the R terminal 2b corresponding to each state in the "state" column. . The voltage value of
the ADIN terminal corresponding to each state in the "state" column is the same as in the case of
FIG. 7 or FIG. Therefore, also in this case, the microcomputer 1 can identify each state based on
the voltage of the ADIN terminal and set the output mode to monaural or stereo.
[0068]
That is, as shown in FIG. 10, in the state of “main body jack open (not connected)” in which
nothing is connected to the 4-pole jack 2 of the audio device, and in FIG. The microcomputer 1
sets the output mode to monaural in the state of "with remote control" and "with remote control
(key pressed)" in which the remote control key K1 is pressed and not pressed. However, in the
state of “with remote control” and “with remote control (key pressed)”, the adapter of FIG. 9
is connected to the remote control, and further, a plug for monaural output is connected to the
jack 92 thereof. The case is included. On the other hand, the remote control of FIG. 2 is
connected to the 4-pole jack 2, a normal 3-pole plug is connected to this, and the remote control
key K1 is pressed and not pressed. In the case of “with 3-pole plug (key pressed)” and
“without remote control (direct 3-pole plug)” in which a normal 3-pole plug is directly
connected to 4-pole jack 2, the microcomputer 1 outputs Set the mode to stereo. Thus, the 4-pole
jack 11 of the remote control can be used for both monaural and stereo output.
[0069]
The present invention can be appropriately modified and implemented without being limited to
the above embodiment. For example, in the above description, the remote control key is used to
input an on / off binary command, but instead, a plurality of sets of the resistor R3 and the
remote control key K1 are used to input more commands. It may be possible.
[0070]
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22
It is a circuit diagram showing an important section of an audio device concerning one
embodiment of the present invention. It is a circuit diagram which shows the structure of the
remote control which can be used for the apparatus of FIG. It is a figure which shows the
example of control of the selector by the microcomputer in the apparatus of FIG. It is a circuit
diagram showing the important section of the remote control concerning another embodiment. It
is a figure which shows the example of control by a microcomputer in the case of using the
remote control of FIG.4 (b) for the audio apparatus of FIG. It is a figure which shows the structure
of the adapter which can be connected to 4 pole jack of the remote control of FIG. FIG. 7 is a
diagram showing a control example in a configuration provided with the audio device of FIG. 1,
the remote control of FIG. 2 and the adapter of FIG. 6; FIG. 7 is a diagram showing another
control example in the configuration provided with the audio device of FIG. 1, the remote control
of FIG. 2, and the adapter of FIG. 6. It is a figure which shows another example of the adapter
connected to the remote control of FIG. It is a figure which shows the example of control in the
structure provided with the audio apparatus of FIG. 1, the remote control of FIG. 2, and the
adapter of FIG. It is a circuit diagram showing the principal part of the conventional audio device
which can use 4 pole plug. It is a circuit diagram which shows the structure of the remote control
which can be used for the audio apparatus of FIG. FIG. 12 is a diagram showing four types of
voltage values input to the ADIN terminal of the microcomputer in the configuration of FIG. 11
and states corresponding thereto. FIG. 12 is a diagram showing control by a microcomputer
which is possible when using a 4-pole jack as a headphone terminal in the configuration of FIG.
11; FIG. 12 is a diagram showing control by a microcomputer which is possible when using a 4pole jack as a microphone terminal in the configuration of FIG. 11;
Explanation of sign
[0071]
1: Microcomputer, 2: 4 pole jack, 2a: GND terminal, 2b: command terminal, 2c: R terminal, 2d: L
terminal, 3: 3 pole plug, 4, 5: 4 pole plug, 5a: GND pin, 5b : Command terminal, 5c: R terminal,
5d: L terminal, 7: Microphone, 7L: Left channel microphone, 7R: Right channel microphone, 8:
Input selector, 9: 4 terminals, 9a: GND terminal, 9b: Command terminal, 9c: R terminal, 9d: L
terminal, 10: 3 pole plug, 10a: GND terminal, 10c: R terminal, 10d: L terminal, 11: 4 pole jack,
11a: GND terminal, 11b: switch terminal, 11c: R terminal, 11d: L terminal, 61: 4 pole plug, 61a to
61d: terminal, 62: 3 pole jack, 62a, 62c, 62d: terminal, 91: 4 pole plug, 91a to 91d: terminal, 92:
Jack, 92a: GND terminal, 92d: signal terminals, R1 to R4: resistances, K1: remote control key, S1:
the switch.
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