JP2011223313A - Conversion adapter, electronic apparatus, and electronic apparatus system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a conversion adapter, an electronic apparatus and an electronic apparatus system, which are capable of detecting plural kinds of connected apparatuses with a fewer number of terminals, and allow a generic connection and usage.SOLUTION: The conversion adapter 100 is configured such that a resistance value between an output terminal 141, which can be connected to a electronic apparatus 200, and the ground is determined at a first resistance value, indicating that a stereophonic headset is connected, if first and second input terminals 121 and 122, which can be connected to headsets 310 and 320, are connected to the ground. A resistance value between the output terminal 141 and the ground is determined at a second resistance value that is larger than the first resistance value, indicating that a monaural headset is connected, if the first input terminal 121 is connected to the ground and the second input terminal 122 is connected to nothing. The output terminal 141 and ground are made open, indicating that no headset is connected, if the first and second input terminals 121 and 122 are connected to nothing.

Description

  The present invention relates to a conversion adapter, an electronic device, and an electronic device system.

  Some electronic devices such as a mobile phone and a portable music player are configured so that various external devices such as a headset can be connected to a USB connector. The electronic device needs to determine which device is connected when another device is connected, and perform appropriate processing inside the electronic device based on the determined result.

  Patent Document 1 describes a conversion cable for connecting a portable information terminal and an audio device. The conversion cable described in Patent Document 1 includes a cable incorporating a signal line for transmitting a signal from a connection plug for connection to a portable information terminal, an antenna line connected to the connection plug, and formed integrally with the cable. And a connection jack connected to the cable via a high impedance means for cutting off the high-frequency current and connected to the audio device.

  Patent Document 2 describes an electronic device that can determine the connection of a plurality of devices. The electronic device described in Patent Document 2 includes a plurality of devices based on a resistance, a connector connected to another device, a resistance value of the resistor, and a resistance value of a resistor included in the other device connected to the connector. And a detection unit that detects and controls a plurality of parameters. Specifically, the electronic device side is connected to the AD port via a resistor connected to the reference voltage VREF. The connected device side is pulled down to ground using a resistor. By changing the resistance value of the pull-down resistor on the external device side according to the type of the connected device, the electronic device can identify the connected device connected to the connector by measuring the resistance value. The type of a plurality of connected devices can be determined using one terminal of the connector, the number of terminals of the connector can be reduced, and the device can be downsized.

JP 2008-099117 A JP 2008-097298 A

  However, in such a conventional electronic device, since the connected device is identified using only the resistance value of one terminal of the connector, the connected device side needs to have each pull-down resistor according to the type of the device. is there. For this reason, the electronic device cannot generally connect and use a plurality of connection devices. For example, an electronic device cannot use a headset or the like for a micro USB standard connector.

  An object of the present invention is to provide a conversion adapter, an electronic device, and an electronic device system that can detect a plurality of types of connection devices with fewer terminals and can be connected and used for general purposes.

  The conversion adapter of the present invention is connectable to an audio output terminal that can be connected to a stereo or monaural headset, first and second input terminals that can be connected to the headset, an electronic device, and the audio. An audio input terminal connected to the output terminal, and an output terminal connectable to the electronic device, and when the first and second input terminals are connected to the ground, between the output terminal and the ground When the first input terminal is connected to the ground and the second input terminal is not connected anywhere, the resistance value of the output terminal and the ground is When the first resistance value is larger than the first resistance value and the second resistance value indicates monaural headset connection, and the first and second input terminals are not connected anywhere, the output terminal Between ground and adopts a configuration that open showing the unconnected headset.

  The electronic device of the present invention is an electronic device that can be connected to the conversion adapter, a resistance value input terminal that can be connected to the output terminal, a voice that can be connected to the voice input terminal, and that outputs a voice signal. A signal output terminal, wherein when the first resistance value is detected at the resistance value input terminal, a stereo signal is output to the audio signal output terminal, and the second resistance value is set at the resistance value input terminal. When detecting, the structure which outputs a monaural signal to the said audio | voice signal output terminal is taken.

  The electronic device system of this invention takes the structure provided with the said conversion adapter and the said electronic device.

  According to the present invention, it is possible to realize a conversion adapter, an electronic device, and an electronic device system that can detect a plurality of types of connection devices with fewer terminals and can be generally connected and used.

The perspective view which shows typically an electronic device system provided with the conversion adapter which concerns on Embodiment 1 of this invention. The circuit diagram which shows the structure of the conversion adapter which concerns on the said Embodiment 1. The circuit diagram which shows the structure of the conversion adapter which concerns on Embodiment 2 of this invention

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

(Embodiment 1)
FIG. 1 is a perspective view schematically showing an electronic device system including a conversion adapter according to Embodiment 1 of the present invention. The present embodiment is an example applied to a conversion adapter that connects an electronic device and a headset.

  As shown in FIG. 1, the electronic device system includes a conversion adapter 100 and an electronic device 200 that can be connected to the conversion adapter 100.

  The conversion adapter 100 connects the electronic device 200 and the connection device 300. The conversion adapter 100 is provided with a micro USB standard connection connector 101 on a main body 100 a and a square connector 103 for connection to the connection device 300 via a cable 102. In the second embodiment to be described later, the connected device is provided with switches 511 and 521 (see FIG. 3).

  The electronic device 200 is a mobile device such as a mobile phone / PHS (Personal Handy-Phone System) or a portable music player. The electronic device 200 can be applied to a portable device such as a PDA (Personal Digital Assistants: portable information terminal) or a portable game machine.

  The connection device 300 is an external device that can be connected to the electronic device 200, for example, a stereo headset 310 and a monaural headset 320.

  Stereo headset 310 includes square connector 311, stereo earphone 312, and earphone microphone 313. The square connector 311 can be connected to the square connector 103 of the conversion adapter 100.

  Similarly, the monaural headset 320 includes a square connector 321, a monaural earphone 3222, and an earphone microphone 323. The square connector 321 can be connected to the square connector 103 of the conversion adapter 100.

  The square connectors 311 and 321 have the same shape, and either the stereo headset 301 or the monaural headset 302 can be connected to the square connector 103 of the conversion adapter 100.

  FIG. 2 is a circuit diagram showing a configuration of the conversion adapter 100. 2A is a configuration example when a stereo headset 310 is connected to the conversion adapter 100, and FIG. 2B is a configuration example when a monaural headset 320 is connected to the conversion adapter 100. FIG.

  As shown in FIG. 2, the conversion adapter 100 includes audio output terminals 111 and 112 that can be connected to a stereo headset 310 or monaural headset 320, a microphone input terminal 113 that can be connected to earphone microphones 313 and 323, and a stereo head. A first input terminal 121 and a second input terminal 122 that can be connected to the set 310 or the monaural headset 320 are provided.

  In addition, the conversion adapter 100 can be connected to the electronic device 200, and the audio input terminals 131 and 132 connected to the audio output terminals 111 and 112, the microphone output terminal 133 connectable to the earphone microphones 313 and 323, An output terminal 141 connectable to the electronic device 200.

  The audio output terminals 111 and 112, the microphone input terminal 113, the first input terminal 121, and the second input terminal 122 are connection terminals of the rectangular connector 103 for connecting the connection device 300.

  The audio input terminals 131 and 132, the microphone output terminal 133, and the output terminal 141 are connection terminals of the connection connector 101 for connecting the electronic device 200. The connection connector 101 has a connection terminal with a small number of pins (for example, 5 pins) such as a micro USB connector.

  When the first input terminal 121 and the second input terminal 122 are connected to the ground, the conversion adapter 100 uses the resistance value between the output terminal 141 and the ground as the first resistance value indicating stereo headset connection. When the first input terminal 121 is connected to the ground and the second input terminal 122 is not connected anywhere, the resistance value between the output terminal 141 and the ground is larger than the first resistance value, and the monaural head When the first resistance value indicating the set connection is the second resistance value, and the first input terminal 121 and the second input terminal 122 are not connected anywhere, the output terminal 141 and the ground are opened to indicate that the headset is not connected. To do.

  The conversion adapter 100 has one end connected to the first input terminal 121 and the other end connected to the output terminal 141, the first resistor 151 having a resistance value R1, and one end connected to the second input terminal 122. A second resistor 152 having a resistance value R2 and having the other end connected to the output terminal 141.

  The conversion adapter 100 has the following relationship, where the first resistance value is Rst and the second resistance value is Rmo.

Rst = (R1 × R2) / (R1 + R2)
Rmo = R1
According to the simulation by the present inventor, the conversion adapter 100 preferably has a first resistance value within ± 5% of 287 kΩ and a second resistance value within ± 5% of 797 kΩ. Verified. Further, it was verified that the conversion adapter 100 preferably has R1 within ± 5% of 797 kΩ and R2 within ± 5% of 449 kΩ. Incidentally, there are 437 kΩ, 442 kΩ, 453 kΩ, 464 kΩ, and the like as the resistance value within ± 5% of 449 kΩ of R2.

  The electronic device 200 includes a resistance detection circuit 210, an S / M determination unit 220, and an audio control unit 230.

  The resistance detection circuit 210 is connected to the output terminal 141 of the conversion adapter 100 and detects the resistance of the output terminal 141. Specifically, the resistance detection circuit 210 has a pull-up resistor (not shown) connected to the reference voltage, and a potential value based on a voltage dividing ratio between this resistor and the resistance of the conversion adapter 100 connected to the output terminal 141. Thus, the resistance of the output terminal 141 is detected.

  The S / M determination unit 220 includes, for example, a comparator, and determines the type of the connected device 300 by comparing the resistance value detected by the resistance detection circuit 210 with a predetermined reference voltage. Here, the S / M determination unit 220 determines stereo headset connection / monaural headset connection / non-connection.

  The voice control unit 230 performs voice control based on the determination result determined by the S / M determination unit 220. For example, in the case of stereo headset connection, the audio control unit 230 outputs a stereo signal to the audio input terminals 131 and 132 (Lch, Rch) of the connection connector 101 of the conversion adapter 100. In the case of monaural headset connection, the audio control unit 230 mixes stereo signals to create a monaural signal, and outputs the monaural signal to the audio input terminal 131 (Lch) of the connection connector 101 of the conversion adapter 100. In addition, the audio control unit 230 optimally adjusts the output level in either case of the stereo headset connection / monaural headset connection. Furthermore, the voice control unit 230 stops the voice output to the connection connector 101 of the conversion adapter 100 when not connected.

  Hereinafter, a method of using the conversion adapter 100 configured as described above will be described.

  The electronic device 200 can be connected to an arbitrary connection device 300 via the conversion adapter 100. As described above, the conversion adapter 100 is used for both stereo and monaural without distinction. The conversion adapter 100 also includes specifications such as the shape and pin arrangement of the connection connector 101 for connecting the electronic device 200 and specifications such as the shape and pin arrangement of the rectangular connector 103 for connecting the connection device 300. Are common to each other. Therefore, the conversion adapter 100 can connect the various electronic devices 200 and the connection device 300 to each other.

  The conversion adapter 100 displays the resistance values of stereo headset connection / monaural headset connection / non-connection at the output terminal 141 according to the ground connection state of the first input terminal 121 and the second input terminal 122. Specifically, the conversion adapter 100 has the following resistance values between the output terminal 141 and the ground.

  When the first input terminal 121 and the second input terminal 122 are connected to the ground, the conversion adapter 100 uses the resistance value between the output terminal 141 and the ground as the first resistance value indicating stereo headset connection. And For example, the first resistance value is within ± 5% of 287 kΩ.

  In the conversion adapter 100, when the first input terminal 121 is connected to the ground and the second input terminal 122 is not connected anywhere, the resistance value between the output terminal 141 and the ground is larger than the first resistance value. The second resistance value indicates a monaural headset connection. For example, the second resistance value is within ± 5% of 797 kΩ.

  When the first input terminal 121 and the second input terminal 122 are not connected anywhere, the conversion adapter 100 opens between the output terminal 141 and the ground to indicate that the headset is not connected.

  As described above, the conversion adapter 100 has resistance values of stereo headset connection / mono headset connection / non-connection.

  The electronic device 200 can connect a general-purpose connection device 300 through the conversion adapter 100.

  The resistance detection circuit 210 is connected to the output terminal 141 of the conversion adapter 100 and detects the resistance of the output terminal 141.

  Based on the resistance value detected by the resistance detection circuit 210, the S / M determination unit 220 determines whether the connected device 300 is connected to the stereo headset, connected to the monaural headset, or not connected.

  The voice control unit 230 performs voice control based on the determination result determined by the S / M determination unit 220.

  As described in detail above, according to the present embodiment, the conversion adapter 100 includes the first input terminal 121 and the second input terminal 122 that can be connected to the stereo headset 310 or the monaural headset 320, and the electronic And an output terminal 141 that can be connected to the device 200. When the first input terminal 121 and the second input terminal 122 are connected to the ground, the conversion adapter 100 uses the resistance value between the output terminal 141 and the ground as the first resistance value indicating stereo headset connection. When the first input terminal 121 is connected to the ground and the second input terminal 122 is not connected anywhere, the resistance value between the output terminal 141 and the ground is larger than the first resistance value, and the monaural head When the first resistance value indicating the set connection is the second resistance value, and the first input terminal 121 and the second input terminal 122 are not connected anywhere, the output terminal 141 and the ground are opened to indicate that the headset is not connected. To do.

  By using the conversion adapter 100, a conventional headset can be used as it is with fewer terminals. For example, a stereo headset 310 or a monaural headset 320 having a micro USB connector can be used as it is. Further, the electronic device 200 can discriminate a plurality of types of connection devices with only one terminal of the output terminal 141, the number of terminals of the connection connector 101 can be reduced, and the device can be downsized.

(Embodiment 2)
The second embodiment is an example of a conversion adapter including a terminal to which a switch is connected.

  FIG. 3 is a circuit diagram showing a configuration of conversion adapter 400 according to Embodiment 2 of the present invention. 3A shows a configuration example when the stereo headset 510 is connected to the conversion adapter 400, and FIG. 3B shows a configuration example when the monaural headset 520 is connected to the conversion adapter 400. FIG. The same components as those in FIG. 2 are denoted by the same reference numerals, and description of overlapping portions is omitted.

  The external appearance of the stereo headset 510 / monaural headset 520 that can be connected to the conversion adapter 400 is substantially the same as FIG.

  As shown in FIG. 3, the stereo headset 510 is a stereo headset with a remote control that further includes a switch 511 in addition to the stereo headset 310 of FIG. 2. Similarly, the monaural headset 520 is a monaural headset with a remote control provided with a switch 521 in addition to the monaural headset 320 of FIG.

  The conversion adapter 400 includes a third input terminal 423 that can be connected to the switches 511 and 521.

[When the third input terminal 423 is connected to the ground]
When the third input terminal 423 is connected to the ground by the operation of the switches 511 and 521, the conversion adapter 400 has a resistance value between the output terminal 141 and the ground that is smaller than the first resistance value, and the switch 511. , 521, the third resistance value indicating the operation. For example, the third resistance value is within ± 5% of 47 kΩ.

  The conversion adapter 400 has one end connected to the first input terminal 121 and a third resistor 403 having a resistance value R3, and one end connected to the second input terminal 122 and a fourth resistor 404 having a resistance value R4. The other end of the third resistor 403, the other end of the fourth resistor 404, and the other end of the fifth resistor 405. Is connected.

  The conversion adapter 400 has the following relationship, where the first resistance value is Rst and the second resistance value is Rmo.

Rst = R5 + (R3 × R4) / (R3 + R4)
Rmo = R5 + R3
The conversion adapter 400 preferably has a third resistance value within ± 5% of 47 kΩ.

[When the third input terminal 423 is opened]
The conversion adapter 400 has one end connected to the first input terminal 121 and a third resistor 403 having a resistance value R3, and one end connected to the second input terminal 122 and a fourth resistor 404 having a resistance value R4. The other end of the third resistor 403, the other end of the fourth resistor 404, the fifth resistor 405, and the third resistor 405. The other end of the input terminal 423 is connected.

  The conversion adapter 400 has the following relationship, where the first resistance value is Rst, the second resistance value is Rmo, and the third resistance value is Rsw.

Rst = R5 + (R3 × R4) / (R3 + R4)
Rmo = R5 + R3
Rsw = R5
According to the simulation by the present inventor, in the conversion adapter 400, R3 is within ± 5% of 750 kΩ, R4 is within ± 5% of 353 kΩ, and R5 is within ± 5% of 47 kΩ. Was verified to be preferable. Incidentally, there are 348 kΩ, 357 kΩ, 360 kΩ, and the like as the resistance value within ± 5% of 353 kΩ of R4.

  Hereinafter, a method of using the conversion adapter 400 configured as described above will be described. The basic operation is the same as that of the conversion adapter 100 of FIGS.

  Further, the conversion adapter 400 is connected to the ground connection / opening of the third input terminal 423 connected to the switches 511 and 521.

  When the third input terminal 423 is connected to the ground by the operation of the switches 511 and 521, the conversion adapter 400 has a resistance value between the output terminal 141 and the ground that is smaller than the first resistance value, and the switch 511. , 521, the third resistance value indicating the operation.

  When the third input terminal 423 is opened, the conversion adapter 400 has one end connected to the first input terminal 121, the third resistor 403 having a resistance value R3, and one end connected to the second input terminal 122. A fourth resistor 404 having a resistance value R4, one end connected to the output terminal 141, and a fifth resistor 405 having a resistance value R5. The other end of the third resistor 403, the fourth resistor The other end of 404, the fifth resistor 405, and the other end of the third input terminal 423 are connected. Here, the conversion adapter 400 has the relationship described above, where the first resistance value is Rst, the second resistance value is Rmo, and the third resistance value is Rsw.

  As described above, the conversion adapter 400 has the respective resistance values of stereo headset connection / mono headset connection / unconnected at the third input terminal 423 ground connection / opening.

  In the electronic device 200, as in the first embodiment, the resistance detection circuit 210 detects the resistance of the output terminal 141, and the S / M determination unit 220 uses the resistance value detected by the resistance detection circuit 210 as a basis. It is determined whether the connected device 300 is connected to the stereo headset / mono headset / not connected.

  The voice control unit 230 performs voice control based on the determination result determined by the S / M determination unit 220.

  For example, in the case where the electronic device 200 is a portable device such as a portable music player, the portable music player or the like is connected to the ground on / off of the third input terminal 423 by the operation of the switches 511 and 521. With respect to music as an audio signal output to the input terminals 131 and 132, changes such as reproduction start / stop, reproduction song advance / reproduction song fast forward / reproduction song rewind, etc. can be added.

  When electronic device 200 is a mobile communication device such as a mobile phone, call start / end control is executed based on ground connection / release of third input terminal 423 by the operation of switches 511 and 521. That is, it is possible to output the call voice to the voice input terminals 131 and 132 when the call starts, and to stop outputting the call voice being output when the call ends, and the mobile phone or the like can be connected to the voice input terminals 131 and 132. The output audio signal can be changed.

  As described above, according to the present embodiment, the conversion adapter 400 further includes the third input terminal 423 connected to the switches 511 and 521. Therefore, the effects of the first embodiment, that is, a plurality of types are provided. Connected devices can be detected with fewer terminals and can be connected and used for general purposes, and controls such as music playback start / stop and call start / end control are executed by operating switches 511 and 521. can do.

  In this embodiment, the conversion adapter including the third input terminal 423 has been described. However, the conversion adapter may not include the third input terminal 423. In that case, the conversion adapter includes the third resistor 403, the fourth resistor 404, and the fifth resistor 405 as described above, and thus has the same effect as that of the first embodiment. That is, a plurality of types of connected devices can be detected with fewer terminals, and can be connected and used for general purposes.

  Further, the connection connector 101 is a micro USB standard connector through the first and second embodiments, but is not limited thereto, a USB A (Standard-A) standard connector, a USB B (Standard-B) standard connector, Alternatively, a connector conforming to the USB standard such as a mini USB standard connector may be used.

  The above description is an illustration of a preferred embodiment of the present invention, and the scope of the present invention is not limited to this.

  In the above embodiments, the names conversion adapter, electronic device, and electronic device system are used. However, this is for convenience of description, and may be a conversion connector, a conversion cable, a portable communication terminal, a control system, or the like. Of course.

  Furthermore, the components constituting the conversion adapter, for example, resistors, types and materials of connector terminals, the number thereof, and connection methods may be any. In addition, the types of electronic devices and connection devices can be changed as appropriate.

  The conversion adapter, the electronic device, and the electronic device system according to the present invention are applicable to a conversion adapter that connects a connection device such as a headset and a mobile terminal such as a mobile phone / PDA. Further, the present invention can be applied to a personal computer or a device in which the personal computer is integrated, and portable devices such as an MP3 player, an HDD player, and a portable game machine.

100,400 Conversion adapter 100a Conversion adapter body 101 Connection connector 102 Cable 103 Rectangular connector 111, 112 Audio output terminal 121 First input terminal 122 Second input terminal 131, 132 Audio input terminal 141 Output terminal 151 First resistor 152 Second resistor 200 Electronic device 300 Connection device 310, 510 Stereo headset 320, 520 Mono headset 311, 321 Square connector 312 Stereo earphone 313, 323 Earphone microphone 322 Monaural earphone 403 Third resistor 404 Fourth resistor 405 fifth resistor 423 third input terminal 511, 521 switch

Claims (13)

An audio output terminal that can be connected to a stereo or mono headset;
First and second input terminals connectable to the headset;
An audio input terminal connectable to the electronic device and connected to the audio output terminal;
An output terminal connectable to the electronic device,
When the first and second input terminals are connected to the ground, a resistance value between the output terminal and the ground is a first resistance value indicating a stereo headset connection,
When the first input terminal is connected to the ground and the second input terminal is not connected anywhere, the resistance value between the output terminal and the ground is larger than the first resistance value, and the monaural headset A second resistance value indicating connection;
A conversion adapter that opens between the output terminal and the ground when the first and second input terminals are not connected anywhere, indicating that a headset is not connected. The conversion adapter according to claim 1,
The first resistance value is within ± 5% of 287 kΩ,
The conversion adapter, wherein the second resistance value is within ± 5% of 797 kΩ. The conversion adapter according to claim 1 or 2,
The first resistance value is Rst, the second resistance value is Rmo,
A first resistor having a resistance value R1 having one end connected to the first input terminal and the other end connected to the output terminal;
A second resistor having a resistance value R2 having one end connected to the second input terminal and the other end connected to the output terminal;
Rst = (R1 × R2) / (R1 + R2)
Rmo = R1
Conversion adapter that is. The conversion adapter according to claim 1 or 2,
The first resistance value is Rst, the second resistance value is Rmo,
A third resistor having one end connected to the first input terminal and having a resistance value R3;
A fourth resistor having one end connected to the second input terminal and having a resistance value R4;
One end connected to the output terminal, and a fifth resistor having a resistance value R5,
The other end of the third resistor, the other end of the fourth resistor, and the other end of the fifth resistor are connected,
Rst = R5 + (R3 × R4) / (R3 + R4)
Rmo = R5 + R3
Conversion adapter that is. The conversion adapter according to claim 1 or 2,
A third input terminal connectable to the switch;
When the third input terminal is connected to the ground by the operation of the switch, a resistance value between the output terminal and the ground is smaller than the first resistance value, and indicates the operation of the switch. Conversion adapter with a resistance value of. The conversion adapter according to claim 5,
The conversion adapter, wherein the third resistance value is within ± 5% of 47 kΩ. The conversion adapter according to claim 5 or 6,
The first resistance value is Rst, the second resistance value is Rmo, the third resistance value is Rsw,
A third resistor having one end connected to the first input terminal and having a resistance value R3;
A fourth resistor having one end connected to the second input terminal and having a resistance value R4;
One end connected to the output terminal, and a fifth resistor having a resistance value R5,
The other end of the third resistor, the other end of the fourth resistor, the other end of the fifth resistor, and the third connection terminal are connected,
Rst = R5 + (R3 × R4) / (R3 + R4)
Rmo = R5 + R3
Rsw = R5
Conversion adapter that is. The conversion adapter according to claim 3,
R1 is within ± 5% of 797 kΩ,
The conversion adapter in which R2 is within ± 5% of 449 kΩ. The conversion adapter according to claim 4 or claim 7,
R3 is within ± 5% of 750 kΩ,
R4 is within ± 5% of 353 kΩ,
R5 is a conversion adapter that is within ± 5% of 47 kΩ. An electronic device connectable to the conversion adapter according to any one of claims 1 to 9,
A resistance value input terminal connectable to the output terminal;
An audio signal output terminal that is connectable to the audio input terminal and outputs an audio signal;
When detecting the first resistance value at the resistance value input terminal, a stereo signal is output to the audio signal output terminal;
An electronic device that outputs a monaural signal to the audio signal output terminal when detecting the second resistance value at the resistance value input terminal. An electronic device connectable to the conversion adapter according to any one of claims 5, 6, 7, and 9,
An electronic device that changes an audio signal to be output to the audio input terminal by operating the switch. The electronic device according to claim 10 or 11,
It has a USB standard connector,
The resistance value input terminal and the audio signal output terminal are electronic devices assigned to connection pins of the connection connector.   An electronic device system comprising: the conversion adapter according to any one of claims 1 to 9; and the electronic device according to any one of claims 10 to 12.

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