JP2003058977A - Portable electronic equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To switch output of sound signals to a loudspeaker and an earphone without using a switch having mechanical operations. SOLUTION: This portable electronic equipment is constituted so that a base and an emitter of a transistor Tr1 are conducted by insertion of an earphone plug 10a into an earphone jack 11 and voltage Vcc is generated in a collector of the transistor Tr1. Thus, a relay switch 12 switches the sound signal to be outputted from a sound signal output device 13 so that it is outputted to an amplifier 15a. The amplifier 15a amplifies the sound signal and outputs it to the earphone jack 11.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a portable electronic device, and more particularly to a portable electronic device for switching audio output signals to an earphone and a speaker.

[0002]

2. Description of the Related Art At present, electronic devices have become smaller, easier to carry, and can be carried anywhere. Moreover, some of these electronic devices output a voice and use the voice in accordance with the voice to improve convenience. For example, HHT that performs meter reading business for electricity, gas, etc.
Some (hand-held terminals) are handheld and used around the home to perform meter reading according to the voice.

Such portable electronic devices often have two types of audio outputs, a speaker output and an earphone output. This is because it may be difficult to use the speaker output alone, making it difficult to hear, such as when the surrounding noise is loud.
In addition, the sound from the speaker may be annoying to the surroundings. For this reason, sound is also output from the earphone so that the sound can be heard directly by the ear.

To output the voice output from the earphone, the earphone plug is connected to the earphone jack of the portable electronic device. At the same time, the portable electronic device detects that the earphone plug is connected and switches the output of the audio signal from the speaker to the earphone. FIG. 8 shows a schematic circuit diagram of a conventional earphone detection device. 8 includes an earphone plug 100 and an earphone jack 101.
And a switch 102 and a resistor R3.

The earphone plug 100 is inserted into the earphone jack 101, and at the same time, the earphone jack 101 is inserted.
The switch 102 is opened and closed by contacting a switch opening and closing portion of the switch 102 provided at the innermost part of the switch 102.

The earphone jack 101 has an opening for inserting the earphone plug 100, and a switch 102 at the innermost portion of this opening. Earphone jack 101
Is electrically connected to the portion of the switch 102 that opens and closes the switch.

The switch 102 comprises an opening / closing part 102a which is a part for opening and closing the switch, and a contact 102b which is in contact with the part for opening and closing the switch. Opening / closing part 10
2a, earphone plug 100 is earphone jack 10
When it is inserted into the connector 1, it is pushed by the tip of the earphone plug 100 to come into contact with the contact 102b and close the switch. When it is not inserted, the opening / closing part 102a opens the switch. Further, the contact 102b is connected to the power supply Vcc via the resistor R3.

The operation of the earphone detecting device shown in FIG. 8 will be described below. When the earphone plug 100 is not inserted into the earphone jack 101, the switch 10
2 is open, and a potential difference Vcc is generated at the terminal a.

When the earphone plug 100 is inserted into the earphone jack 101, the opening / closing part 102a is pushed by the tip of the earphone plug 100 and contacts 102b.
And the potential difference is not generated at the terminal a.

That is, the potential difference generated at the terminal a is detected to switch the voice output to the earphone and the speaker.

[0011]

As described above, in the prior art, a switch for opening and closing by operation is provided for detecting the insertion of the earphone plug into the earphone jack, and the tip of the earphone plug is attached to the opening and closing portion of the switch. They were in contact with each other and moved to open and close the switch. Such a switch involving mechanical operation has a short useful life. In addition, there is a problem that a switch involving mechanical operation is expensive.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a portable electronic device in which the earphone jack can be used for a long time and the manufacturing cost is low.

[0013]

According to the present invention, in order to solve the above problems, a portable electronic device for switching an audio output signal to an earphone and a speaker has an earphone jack having a first terminal and a second terminal. An earphone plug that is inserted into the earphone jack and contacts the first terminal and the second terminal to electrically connect the first terminal and the second terminal, and the first terminal and the second terminal A discrimination signal generation circuit for generating a discrimination signal as to whether or not the earphone plug is connected to the earphone jack based on the continuity of
There is provided a portable electronic device comprising:

According to the above structure, by inserting the earphone plug into the earphone jack having the first terminal and the second terminal, the earphone plug comes into contact with the first terminal and the second terminal, The terminal and the second terminal are electrically connected via the earphone plug. The determination signal generation circuit determines whether or not electricity is conducted between the first terminal and the second terminal, and outputs the result as a determination signal. The output of the audio signal to the speaker and the earphone is switched by this discrimination signal.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, an embodiment of a portable electronic device of the present invention will be described with reference to the drawings by taking a case where it is applied to an HHT as an example.

FIG. 1 shows an H according to a first embodiment of the present invention.
It is a figure showing the circuit composition of HT. 1 includes an earphone 10, an earphone jack 11, a relay switch 12, a voice output device 13, a speaker 14, amplifiers 15a and 15b, resistors R1 and R2, and a transistor T.
It consists of r1. Here, FIG. 2 is a perspective view of the HHT as seen from the back side. As shown in the figure, an earphone jack 11 is provided on the side surface of the HHT and a speaker 14 is provided on the back surface.

The earphone 10 has an earphone plug 10a, and when it is connected to the earphone jack 11, it is possible to listen to the sound. Earphone plug 10a
It is a male terminal in the shape of a cylinder, and is divided into a conducting portion 10aa which comes into contact with a detection terminal which will be described later, and a portion for inputting a voice signal which will be described later with an insulator interposed therebetween.

The earphone jack 11 is made of, for example, plastic having an excellent insulating property, and the voice terminal 1 is provided therein.
1a and the detection terminal 11b are fixed. The earphone jack 11 is fixed to the side surface of the HHT shown in FIG.

The voice terminal 11a is the earphone plug 10a.
When it is connected, it contacts the part of the earphone plug 10a for inputting the audio signal and transmits the audio signal to the earphone 10. A conventional method may be used as a method of contacting the voice terminal 11a with the earphone plug 10a, and a detailed description thereof will be omitted. The audio terminal 11a is connected to the audio output device 13 via the amplifier 15a and the relay switch 12.

The detection terminal 11b is the earphone plug 10a.
Is a terminal for detecting that is connected. Here, FIG. 3 is a diagram for explaining the detection terminal, where (a) is a front view, (b) is a side view, and (c) is a perspective view. The detection terminal 11b shown in the figure is the first detection terminal 11ba.
And a second detection terminal 11bb. The first detection terminal 11ba and the second detection terminal 11bb have a plate shape. The first detection terminal 11ba and the second detection terminal 11bb are connected to the conducting portion 10a of the earphone plug 10a.
a, which is slightly narrower than the diameter of the earphone plug 10a so as to come into contact with a without gap, and the conducting portion 1 of the earphone plug 10a.
0aa is arranged so as to face each other at an interval allowing insertion and removal.

The first detection terminal 11ba is connected to the resistor R1 and the base terminal of the transistor Tr1. Second
The detection terminal 11bb of is connected to the emitter terminal of the transistor Tr1 and the ground.

The relay switch 12 is a transistor Tr.
The output destination of the audio signal output from the audio output device 13 is switched according to the voltage output from the collector terminal 1. The relay switch 12 outputs the audio signal output from the audio output device 13 to the amplifier 15a when the voltage output from the collector terminal is Vcc. When the voltage from the collector terminal is 0V, the audio signal output from the audio output device 13 is output to the amplifier 15b.

The voice output device 13 outputs a voice signal of voice guidance for using HHT to the relay switch 12, for example. The speaker 14 is the voice output device 13
The signal output from the relay switch 12 and the amplifier 1
Received via 5b and utters a voice.

The amplifier 15a receives the audio signal output from the audio output device 13 via the relay switch 12, amplifies the audio signal, and outputs the amplified audio signal to the earphone jack 11. The amplifier 15b receives the audio signal output from the audio output device 13 via the relay switch 12, amplifies the audio signal, and outputs the amplified audio signal to the speaker 14.

The transistor Tr1 has a base terminal, a collector terminal, and an emitter terminal. The base terminal is connected to the resistor R1 and the first detection terminal 11ba. In addition, the collector terminal has a resistor R2 and a relay switch 1
2 is connected. The second detection terminal 11bb and the ground are connected to the emitter terminal.

The resistor R1 has a transistor Tr at one end thereof.
1 is connected to the base terminal and the other end is connected to a power supply having a voltage Vcc. The resistor R2 has one end connected to the collector terminal of the transistor Tr1 and the other end having a voltage Vcc.
Connected to a power source having.

The operation of the HHT shown in FIG. 1 will be described below. First, the earphone plug 10a of the earphone 10
However, the case where it is not connected to the earphone jack 11 will be described.

The earphone plug 10a of the earphone 10 is
When not connected to the earphone jack 11, the first detection terminal 11ba and the second detection terminal 11bb are electrically open. Therefore, the voltage Vcc from the power source is input to the base terminal of the transistor Tr1 via the resistor R1, and the transistor Tr1 is turned on.
The collector terminal and the emitter terminal become conductive. That is, the collector terminal of the transistor Tr1 has the same voltage (0V) as the ground and is input to the relay switch 12.

The relay switch 12 is a transistor Tr.
A voltage of 0 V is input from the collector terminal of 1 and the switch is switched to the speaker 14 side. That is, the audio signal output from the audio output device 13 is output to the amplifier 15b and sent to the speaker 14.

Next, the earphone plug 10 of the earphone 10
The case where a is connected to the earphone jack 11 will be described. Earphone plug 10a of earphone 10
When connected to the earphone jack 11, the earphone plug 1
The conducting portion 10aa of 0a contacts the first detection terminal 11ba and the second detection terminal 11bb. Therefore, the base terminal of the transistor Tr1 is the first detection terminal 11ba,
It will be connected to the ground via the conducting portion 10aa and the second detection terminal 11bb. Therefore, the transistor T
The voltage of the base terminal of r1 becomes 0V, and the transistor T
The collector terminal and the emitter terminal of r1 are turned off. That is, the voltage Vcc of the power supply is generated at the collector terminal of the transistor Tr1 via the resistor R2 and input to the relay switch 12.

The relay switch 12 is a transistor Tr.
The voltage Vcc is input from the collector terminal of No. 1 and the switch is switched to the earphone jack 11 side. That is, the audio signal output from the audio output device 13 is the amplifier 15a.
Output to the earphone jack 11.

By the way, the first detection terminal 11ba and the second detection terminal 11ba
Although the detection terminals 11bb are formed in a plate shape so as to be opposed to each other, the shape is not limited to this shape and arrangement as long as the detection terminals 11bb can come into contact with the conduction portion 10aa of the earphone plug 10a and can conduct electricity. For example, the plate-shaped conducting portion 10aa shown in FIG.
It is also possible to form one mountain shape on the surface side that contacts with to enhance the contact. Further, the first detection terminal 11ba and the second detection terminal 11bb may be arranged vertically. Similarly, the conducting portion 10a of the earphone plug 10a
The shape of a is not limited to the cylindrical shape as long as it can contact the first detection terminal 11ba and the second detection terminal 11bb.

Further, instead of the relay switch 12, FIG.
You may use the switch circuit shown in. The switch circuit shown in FIG. 4 includes AND circuits Z1 and Z2 and an inverter circuit Z3. The terminal a shown in FIG. 4 is connected to the audio output device 13 shown in FIG. 1, the terminal b is connected to the collector terminal of the transistor Tr1, the terminal c is connected to the amplifier 15a, and the terminal d is connected.
Is connected to the amplifier 15b.

In the switch circuit shown in FIG. 4, terminal b
When the voltage Vcc is input from the collector terminal of the transistor Tr1 to the transistor Tr1, the audio signal input to the terminal a is output to the terminal c. When 0V is input to the terminal b from the collector terminal of the transistor Tr1, the audio signal input to the terminal a is output to the terminal d.

As described above, the base terminal of the transistor Tr1 is connected via the first detection terminal 11ba, the conducting portion 10aa of the earphone plug 10a, and the second detection terminal 11bb.
The voltage between the emitter terminals was changed, and signals corresponding to these voltages were output to the collector terminal. And
The output signal is used to switch the output of the audio signal to the earphone 10 and the speaker 14. Therefore, the contacts of the switch are not opened / closed with mechanical operation, so that the earphone jack can be used for a long period of time.

FIG. 5 shows H according to the second embodiment of the present invention.
It is a figure showing the circuit composition of HT. In the HHT of FIG. 5, the same components as those in FIG. 1 are designated by the same reference numerals and the description thereof will be omitted.

The microcomputer 20 operates according to a program stored in a ROM (not shown).
The microcomputer 20 internally has a voice output unit that outputs a voice signal of voice guidance for using HHT, for example. The microcomputer 20 also has an input port PI1, an output port PO1, and an audio output port PO2. The collector terminal of the transistor Tr1 is connected to the input port PI1. The amplifier 21 is connected to the output port PO1. Amplifiers 15a and 21 are connected to the audio output port PO2. The voice output port PO2 outputs the voice signal of the voice guidance for using the HHT described above.

The amplifier 21 has a selector terminal and is connected to the output port PO1 of the microcomputer 20. When an "H" level signal is input to this selector terminal, the audio output port P of the microcomputer 20 is input.
Speaker 1 that amplifies the audio signal output from O2
Output to 4. When the "L" level signal is input, the audio signal from the microcomputer 20 is not output.

The operation of the HHT shown in FIG. 5 will be described below. First, the earphone plug 10a of the earphone 10
However, the case where it is not connected to the earphone jack 11 will be described.

The earphone plug 10a of the earphone 10 is
When not connected to the earphone jack 11, the first detection terminal 11ba and the second detection terminal 11bb are electrically open. Therefore, the voltage Vcc from the power source is input to the base terminal of the transistor Tr1 via the resistor R1, and the transistor Tr1 is turned on.
The collector terminal and the emitter terminal become conductive. That is, the collector terminal of the transistor Tr1 has the same voltage as the ground (0 V), and this voltage is input to the input port PI1 of the microcomputer 20.

The microcomputer 20 detects the voltage of the input port PI1 according to the program stored in the ROM, and outputs 0 from the collector terminal of the transistor Tr1.
When the voltage of V is detected, an "H" level signal is output to the output port PO1. "H" from output port PO1
The level signal is input to the selector terminal of the amplifier 21, and the amplifier 21 amplifies the audio signal from the audio output port PO2 of the microcomputer 20, and the speaker 14
Output to.

Next, the earphone plug 10 of the earphone 10
The case where a is connected to the earphone jack 11 will be described. Earphone plug 10a of earphone 10
When connected to the earphone jack 11, the earphone plug 1
The conducting portion 10aa of 0a contacts the first detection terminal 11ba and the second detection terminal 11bb. Therefore, the base terminal of the transistor Tr1 is the first detection terminal 11ba,
It will be connected to the ground via the conducting portion 10aa and the second detection terminal 11bb. Therefore, the transistor T
The electric potential of the base terminal of r1 becomes 0V, and the transistor T
The collector terminal and the emitter terminal of r1 are turned off. That is, as the voltage of the collector terminal of the transistor Tr1, the voltage Vcc of the power supply is generated via the resistor R2 and is input to the input port PI1 of the microcomputer 20.

The microcomputer 20 detects the voltage of the input port PI1 according to the program stored in the ROM, and when it detects the voltage Vcc of the power source from the collector terminal of the transistor Tr1, outputs the "L" level signal to the output port PO1. Is output. The "L" level signal from the output port PO1 is input to the selector terminal of the amplifier 21, and the amplifier 21 does not output the audio signal from the audio output port PO2 of the microcomputer 20 to the speaker.

In this way, the emitter terminal of the transistor Tr1 via the conducting portion 10aa of the earphone plug 10a, the first detection terminal 11ba, and the second detection terminal 11bb,
The voltage between the base terminals was changed so that signals corresponding to these voltages were output to the collector terminal. Then, the output of the audio signal to the earphone 10 and the speaker 14 is switched by this output signal. Therefore, the contacts of the switch are not opened and closed with mechanical operation,
The earphone jack can be used for a long time.

Further, by using the microcomputer 20, the number of parts can be reduced and the cost can be reduced. FIG. 6 shows H according to the third embodiment of the present invention.
It is a figure showing the circuit composition of HT.

In the HHT shown in FIG. 6, the same parts as those in FIG. 1 are designated by the same reference numerals and the description thereof will be omitted. Audio output device 1
3 outputs the audio signal to the amplifier 15a and the amplifier 30.

The amplifier 30 has a selector terminal and is connected to the collector terminal of the transistor Tr1. When a voltage of 0V is input to this selector terminal, the audio output device 1
The audio signal output from the amplifier 3 is amplified and output to the speaker 14. Also, when the voltage of Vcc is input, the audio signal is not output from the audio output unit.

The operation of the HHT shown in FIG. 6 will be described below. First, the earphone plug 10a of the earphone 10
However, the case where it is not connected to the earphone jack 11 will be described.

The earphone plug 10a of the earphone 10 is
When not connected to the earphone jack 11, the first detection terminal 11ba and the second detection terminal 11bb are electrically open. Therefore, the voltage Vcc from the power source is input to the base terminal of the transistor Tr1 via the resistor R1, and the transistor Tr1 is turned on.
The collector terminal and the emitter terminal become conductive. That is, the collector terminal of the transistor Tr1 has the same potential (0 V) as the ground, and this voltage is input to the selector terminal of the amplifier 30.

The amplifier 30 amplifies the audio signal output from the audio output device 13 and outputs the amplified audio signal to the speaker 14 when the voltage of 0 V output from the transistor Tr1 is input to the selector terminal.

Next, the earphone plug 10 of the earphone 10
The case where a is connected to the earphone jack 11 will be described. Earphone plug 10a of earphone 10
When connected to the earphone jack 11, the earphone plug 1
The conducting portion 10aa of 0a contacts the first detection terminal 11ba and the second detection terminal 11bb. Therefore, the base terminal of the transistor Tr1 is connected to the ground via the conducting portion 10aa of the earphone plug 10a. Therefore, the potential of the base terminal of the transistor Tr1 becomes 0V, and the collector terminal and the emitter terminal of the transistor Tr1 are turned off. That is, as for the voltage of the collector terminal of the transistor Tr1, the voltage Vcc of the power supply is generated via the resistor R2 and is input to the selector terminal of the amplifier 30.

The amplifier 30 does not output the audio signal output from the audio output device 13 to the speaker 14, because the voltage Vcc of the power supply output from the transistor Tr1 is input to the selector terminal.

In this way, the emitter terminal of the transistor Tr1 via the conducting portion 10aa of the earphone plug 10a, the first detection terminal 11ba, and the second detection terminal 11bb,
The voltage between the base terminals was changed so that signals corresponding to these voltages were output to the collector terminal. Then, the output of the audio signal to the earphone 10 and the speaker 14 is switched by this output signal. Therefore, the contacts of the switch are not opened and closed with mechanical operation,
The earphone jack can be used for a long time.

By directly connecting the output signal from the collector terminal of the transistor Tr1 to the selector terminal of the amplifier 30, the number of parts can be reduced and the cost can be reduced.

FIG. 7 shows H according to the fourth embodiment of the present invention.
It is a figure showing the circuit composition of HT. In the HHT of FIG. 7, the same parts as those in FIG. 1 are designated by the same reference numerals and the description thereof will be omitted.

The microcomputer 40 operates according to a program stored in a ROM (not shown).
The microcomputer 40 has an input port PI1, a voice output port PO1, and a voice output port PO2. The collector terminal of the transistor Tr1 is connected to the input port PI1. The audio output port PO1 is
It is connected to the amplifier 15a. Audio output port PO2
Is connected to the amplifier 15b. The microcomputer 40 has, for example, a voice output unit that outputs a voice signal of voice guidance for using the HHT,
An audio signal is output to the audio output port PO1 or PO2 according to the voltage input to the input port PI1. Further, the microcomputer 40 has a register inside and switches the output of the audio signal of the audio output port PO1 or PO2 according to the information written in the register. The writing of information to the register is performed, for example, by accessing from a key input device (not shown).

The operation of the HHT shown in FIG. 7 will be described below. First, the earphone plug 10a of the earphone 10
However, the case where it is not connected to the earphone jack 11 will be described.

The earphone plug 10a of the earphone 10 is
When not connected to the earphone jack 11, the first detection terminal 11ba and the second detection terminal 11bb are electrically open. Therefore, the voltage Vcc from the power source is input to the base terminal of the transistor Tr1 via the resistor R1, and the transistor Tr1 is turned on.
The collector terminal and the emitter terminal become conductive. That is, the collector terminal of the transistor Tr1 has the same potential as ground (0 V), and this voltage is input to the input port PI1 of the microcomputer 40.

The microcomputer 40 detects the voltage of the input port PI1 according to the program stored in the ROM, and when it detects the voltage of 0V from the collector terminal of the transistor Tr1, outputs the audio signal to the audio output port PO2. . Therefore, the amplifier 15b amplifies the audio signal from the audio output port PO2 of the microcomputer 40 and outputs it to the speaker 14.

Next, the earphone plug 10 of the earphone 10
The case where a is connected to the earphone jack 11 will be described. Earphone plug 10a of earphone 10
When connected to the earphone jack 11, the earphone plug 1
The conducting portion 10aa of 0a contacts the first detection terminal 11ba and the second detection terminal 11bb. Therefore, the base terminal of the transistor Tr1 is connected to the ground via the earphone plug 10a. Therefore, the potential of the base terminal of the transistor Tr1 becomes 0V, and the collector terminal and the emitter terminal of the transistor Tr1 are turned off. That is, the voltage at the collector terminal of the transistor Tr1 is the voltage Vcc of the power source generated through the resistor R2,
The voltage Vcc from the power supply is input to the input port PI1 of the microcomputer 40.

The microcomputer 40 detects the voltage of the input port PI1 according to the program stored in the ROM, and when detecting the voltage of Vcc from the collector terminal of the transistor Tr1, outputs the audio signal to the audio output port PO1. . Therefore, the amplifier 15a amplifies the audio signal from the audio output port PO1 of the microcomputer 40 and outputs it to the earphone jack 11.

Further, by rewriting the internal register of the microcomputer 40 by key input, the output to the earphone 10 or the speaker 14 can be forcibly switched.

As described above, the emitter terminal of the transistor Tr1 via the conducting portion 10aa of the earphone plug 10a, the first detection terminal 11ba, and the second detection terminal 11bb,
The voltage between the base terminals was changed so that signals corresponding to these voltages were output to the collector terminal. Then, the output of the audio signal to the earphone 10 and the speaker 14 is switched by this output signal. Therefore, the contacts of the switch are not opened and closed with mechanical operation,
The earphone jack can be used for a long time.

By using the microcomputer 40, various programs can be stored in the ROM and various functions can be added. By the way, although the case where the portable electronic device of the present invention is applied to the HHT has been described, it may be applied to other portable electronic devices such as a PDA and a mobile phone.

[0065]

As described above, according to the present invention, the earphone jack has the first terminal and the second terminal.
The earphone plug is brought into contact with the terminal and the second terminal, and it is further configured to determine whether or not there is conduction between the first terminal and the second terminal. As a result, the earphone jack can be used for a long period of time, and the manufacturing cost can be reduced.

[Brief description of drawings]

FIG. 1 is a diagram showing a circuit configuration of an HHT according to a first embodiment of the present invention.

FIG. 2 is a perspective view of the HHT as seen from the back side.

FIG. 3 is a diagram for explaining detection terminals.

FIG. 4 is a diagram showing a switch circuit.

FIG. 5 is a diagram showing a circuit configuration of an HHT according to a second embodiment of the present invention.

FIG. 6 is a diagram showing a circuit configuration of an HHT according to a third embodiment of the present invention.

FIG. 7 is a diagram showing a circuit configuration of an HHT according to a fourth embodiment of the present invention.

FIG. 8 is a diagram showing a schematic circuit configuration of a conventional earphone detection device.

[Explanation of symbols]

10 earphones 10a earphone plug 10aa Conductive part 11 earphone jack 11a audio terminal 11b Detection terminal 11ba First detection terminal 11bb Second detection terminal 12 relay switch 13 Audio output device 14 speakers 15a, 15b, 21, 30 amplifier 20, 40 microcomputer

Claims (5)

[Claims] 1. A portable electronic device for switching an audio output signal to an earphone and a speaker, comprising: an earphone jack having a first terminal and a second terminal; and a first terminal inserted into the earphone jack. An earphone plug that contacts a second terminal and electrically connects the first terminal and the second terminal, and the earphone plug is connected to the earphone jack based on the electrical connection between the first terminal and the second terminal. A determination signal generation circuit that generates a determination signal of whether or not there is a portable electronic device. 2. The mobile phone according to claim 1, further comprising a voice output switching means for outputting the voice output signal to the earphone or the speaker according to the discrimination signal generated by the discrimination signal generating circuit. Electronics. 3. The portable electronic device according to claim 2, wherein the audio output switching means is composed of a microcomputer. 4. The portable electronic device according to claim 1, further comprising speaker output switching means for outputting the audio output signal to the speaker according to the discrimination signal generated by the discrimination signal generation circuit. . 5. The portable electronic device according to claim 4, wherein the speaker output switching means is composed of a microcomputer.