JP3202724B2 - Mobile terminal - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mobile terminal device such as a portable telephone, and more particularly to a mobile terminal device capable of externally inputting digital information.

[0002]

2. Description of the Related Art In recent years, portable telephones, which have become remarkably widespread, have a function of inputting kana characters and the like by operating keys for inputting telephone numbers. This function allows the user to enter the name of the other party when registering an abbreviated number,
A name can be registered together with a telephone number to create a telephone directory.

[0003] However, there are ten types of numeric keys provided on the mobile phone, from "0" to "9".
Kana characters greatly exceed 50 types, including lowercase characters. Therefore, a plurality of kana characters are assigned to one numeric key. For example, the numeric key of "1"
The five characters "A", "I", "U", "E", and "O" are assigned, and in some cases, one
0 types of characters are assigned.

As a result, kana character input in a mobile phone is a very time-consuming and labor-intensive operation. It is possible to increase the number of keys to make it easier to enter kana characters, etc., but this would increase the size and weight of the equipment and make it the most important portability for mobile terminal devices. Will be lost.

[0005]

SUMMARY OF THE INVENTION The present invention has been made to solve such a problem, and it is an object of the present invention to provide a mobile body capable of easily inputting kana characters and the like while maintaining portability. It is to provide a terminal device.

[0006]

In order to achieve the above object, the present invention provides a first terminal, which is one of an earphone terminal and a microphone terminal, and one of the other of the earphone terminal and the microphone terminal. A second terminal;
A mobile terminal device in which an audio signal received from a communication partner is output through the earphone terminal, and an audio signal input through the microphone terminal is transmitted to the communication partner.
A clock generation circuit that generates a clock signal and outputs the clock signal through the first terminal, and a waveform shaping circuit that receives a serial signal synchronized with the clock signal input through the second terminal and shapes the waveform of the serial signal And characterized in that:

Therefore, in the present invention, for example, a keyboard or the like which outputs a signal representing an operated key in the form of a serial signal is connected via the first and second terminals, and a kana character or the like is inputted from the keyboard. Can be. In that case, the output of the keyboard is connected to the second terminal, and the serial signal from the keyboard is supplied to the waveform shaping circuit through the second terminal and shaped. The serial signal after the waveform shaping is converted into a parallel signal by, for example, a CPU built in the mobile terminal device, and a kana character or the like can be specified. The clock signal generated by the clock generation circuit is input to the keyboard through the first terminal, so that the keyboard can generate a serial signal in synchronization with the clock signal. In a keyboard, this clock signal can be rectified to be used as a power source.

That is, in the present invention, for example, a kana character can be input to the mobile terminal device main body using a keyboard in which one key corresponds to one kana character. Compared to a case where a small number of keys are used to input a kana character, a kana character can be input very easily and in a short time without any trouble. Since only small-scale circuits such as a clock generation circuit and a waveform shaping circuit are added to the mobile terminal device main body, the mobile terminal device main body does not become particularly large or heavy, and cost is reduced. Up is also slight. Furthermore, in the present invention, for example, when a keyboard is used, the keyboard can be used as a power source by rectifying a clock signal, so that there is no need to provide a power source such as a battery for the keyboard. Further, since the earphone terminal and the microphone terminal are used for connection of the keyboard and the like, it is not necessary to newly add a connector or the like to the mobile terminal device body.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a main block diagram showing an example of a mobile phone according to the present invention. As shown in FIG. 1, the mobile phone main body 10 of the mobile phone 2 of the present embodiment includes an earphone terminal 151 and a microphone terminal 153 that constitute an earphone microphone jack 15. The audio signal received from the communication partner is output through the earphone terminal 151, and the audio signal input through the microphone terminal 153 is transmitted to the communication partner. In addition, earphone terminal 1
51 and the microphone terminal 153 are the ground terminals 1 respectively.
52 and the ground terminal 154.

The mobile phone 2 includes a clock generation circuit 115 and a waveform shaping circuit 111. The clock generation circuit 115 generates a clock signal and
The waveform shaping circuit 111 receives the serial signal synchronized with the clock signal input through the earphone terminal 151 and shapes the waveform of the serial signal.

[0011] Earphone terminal 151 and microphone terminal 15
3 is integrated with each ground terminal to constitute the earphone microphone jack 15 as described above, and is attached to a housing (not shown), and an insertion point of the earphone microphone plug into the earphone microphone jack 15 is exposed outside the housing. ing.

In this embodiment, the earphone terminal 151 and the microphone terminal 153 are integrated as described above, but the present invention is also effective when each is separately provided. The mobile phone 2 also includes a changeover switch 113, and a common terminal 113A of the switch 113.
Is connected to the microphone terminal 153, and one switching terminal 113B of the switch 113 is connected to the power supply A through the resistor 16.
The other switching terminal 113C is connected to the resistor 11
4 is connected to the output terminal of the clock generation circuit 115.

FIG. 2 is a circuit diagram showing a waveform shaping circuit 111 constituting the mobile phone 2 according to the embodiment. The waveform shaping circuit 111 has such a configuration in detail. As shown in FIG. 2, the waveform shaping circuit 111 includes a resistor 401 connected in series to the earphone terminal 151,
01 includes a Zener diode 402 connected between a terminal on the opposite side of the earphone terminal 151 and the ground 4. The common connection point between the resistor 401 and the Zener diode 402 is connected to the anode of the diode 403, and the cathode of the diode 403 is connected to the input terminal of the Schmitt buffer 405. A resistor 404 is connected between the input terminal of the Schmitt buffer 405 and the ground 4.

The amplitude of the pulsed serial signal input from the input terminal 6 is limited by the Zener diode 402 and supplied to the Schmitt buffer 405.
The Schmitt buffer 405 shapes the waveform into a rectangular wave. The current flowing through the Zener diode 402 is limited by the resistor 401, and the diode 403 and the resistor 404
As a result, only a positive voltage is input to the buffer 405.
Assuming that the CPU 112 connected to the output of the waveform shaping circuit 111, that is, the output of the Schmitt buffer 405, is operating at a power supply voltage of, for example, 3 V, the constant voltage value of the Zener diode 402 allows for the forward drop voltage of the diode 403. It is appropriate to set it to about 3.6V.

In the present embodiment, the CPU 112 that receives the serial signal whose waveform has been shaped by the waveform shaping circuit 111 is, for example, a one-chip having a built-in peripheral circuit that converts a start-stop synchronous serial signal according to the RS232C standard into a parallel signal. Assume that it is a CPU.

FIG. 3 is a block diagram showing only components related to the earphone microphone out of the components of the portable telephone 2 shown in FIG. In FIG. 3, the switch 113 shown in FIG. 1 is omitted for simplicity, and the microphone terminal 153 is directly connected to the resistor 16. FIG.
As shown in the figure, the mobile phone 2 includes a reception circuit 19, a receiver amplifier 11, and a capacitor 12 as components related to reception, while a transmission circuit 20, a microphone amplifier 18, and a component as components related to transmission. A capacitor 17 is provided.

When making a call using the earphone microphone, the user inserts the earphone microphone plug attached to the end of the cord of the earphone microphone in which the earphone (also called earpiece receiver) and the microphone are integrated, into the earphone microphone jack. 15 and connect. As a result, electrically, as shown in FIG.
3, the microphone 14 is connected, and the earphone 13 is connected to the earphone terminal 151. Note that the earphone 13
Specifically, for example, a dynamic receiver including a coil having an impedance of several tens of ohms can be used.

The audio signal from the other party received by the receiving circuit 19 is amplified by the receiver amplifier 11 and supplied to the earphone 13 through the capacitor 12, so that the earphone 13 is driven. As a result, the voice of the other party is emitted from the earphone 13. The voice emitted by the user is converted into an electric signal by the microphone 14, and the electric signal, that is, the audio signal is amplified by the microphone amplifier 18, supplied to the transmission circuit 20, and transmitted to the other party. The capacitors 12 and 17 are for blocking a DC component included in an output signal of the receiver amplifier 11 and a DC component included in a signal supplied from the microphone 14 to the microphone amplifier 18, respectively. Further, a DC bias voltage VREF is supplied to each of the amplifiers 11 and 18. Resistance 16
Plays a role of giving a DC bias voltage for signal transmission to an AC signal from the microphone 14.

FIG. 4 is a main block diagram showing the overall configuration when the microphone 14 and the earphone 13 are connected to the microphone terminal 153 and the earphone terminal 151, respectively. When the microphone 14 and the earphone 13 are used, the switch 113 is switched to the resistor 16 under the control of the CPU 112. As a result, it becomes electrically equivalent to FIG. 3, and a call using the microphone 14 and the earphone 13 is enabled. It should be noted that which of the switches 113 should be switched is determined, for example, by the user operating an operation unit provided on the housing of the mobile phone 2. The CPU 112 controls the switch 113 based on the operation on the operation unit.

On the other hand, for example, when inputting kana characters,
In the present embodiment, as shown in FIG. 1, the keyboard 110 is connected to the microphone terminal 153 and the earphone terminal 151. A plug (to be described later) that can be attached to the earphone microphone jack 15 is attached to the tip of the cord derived from the keyboard 110. By attaching this plug to the earphone microphone jack 15, the keyboard 1
10 is electrically connected to the mobile phone main body.

FIG. 5 is a schematic block diagram showing the configuration of the keyboard 110 connected to the portable telephone body. As shown in FIG. 5, the keyboard 110 is a keyboard 110.
, A keyboard circuit 504, the rectifier circuit 22, and the like. The rectifier circuit 22 includes a diode 501 and a capacitor 50.
The anode of the diode 501 is connected to the microphone terminal 153 when the plug of the keyboard 110 is connected to the earphone microphone jack 15 as described above, while the cathode is connected to the power supply terminal 50 of the CPU 503.
33. The capacitor is connected between the power supply terminal 5033 of the CPU 503 and the ground terminal 5034.

An operation clock signal input terminal 5032 of the CPU 503 is connected to the microphone terminal 153 by a serial out terminal 5031 for outputting a serial signal according to the RS232C standard.
Is connected to the earphone terminal 151, and the ground terminal 5034 is connected to the ground terminals 152 and 154.

FIG. 6 shows the appearance of the keyboard 110.
FIG. 2A is an external view showing a state in which the keyboard 110 is rolled up like a scroll, and FIG. 2B is an external view showing a state in which the keyboard 110 is expanded for use. As shown in these drawings, the keyboard 110 includes the keyboard body 24.
And a cable 26 derived from the keyboard body 24
And a plug 28 attached to the end of the cable 26. The plug 28 is connected to the earphone microphone jack 15 of the mobile phone body.

The keyboard 110 is a touch key type keyboard, and the main part of the keyboard main body 24 is formed of a film sheet. Therefore, when not in use, it is rolled up like a scroll as shown in FIG. Can be easily carried. When used, the key is expanded as shown in FIG.
Touching “0” enables key input. Key 30
Can be almost the same as the keyboard 110 used in a normal personal computer, and it is basically assumed that one key 30 is assigned one kana character. Note that the CPU 503, the rectifier circuit 22, and the like can be housed inside the lead-out portion 32 of the cable 26, for example.

Next, the portable telephone 2 configured as described above
For example, an operation when a kana character is input will be described. To input kana characters, the user inserts the plug 28 of the keyboard 110 into the earphone microphone jack 15 and connects the keyboard 110 to the mobile phone main body 10.
Connect to Further, a predetermined operation is performed on the operation unit of the mobile phone 2, and the switch 1 is controlled under the control of the CPU 112.
13 is connected to the resistor 114 side.

Thus, the current of the clock signal generated by the clock generation circuit 115 is appropriately limited by the resistor 114, and the switch 113 and the microphone terminal 15
3 to the keyboard 110. In the keyboard 110, the clock signal is received by the rectifier circuit 22 and rectified and smoothed by the CPU 503 as a positive voltage.
Is output to the power supply terminal 5033. The CPU 503 operates using the DC voltage as a power supply. Therefore, the clock signal from the clock generation circuit 115 also serves to supply power to the CPU 503.

The clock signal supplied to the keyboard 110 through the microphone terminal 153 is supplied to an operation clock signal input terminal 5032 of the CPU 503,
03 operates based on this clock signal. Here, when the user operates the keyboard body 24, the keyboard circuit 504 generates a digital signal corresponding to the key 30 touched by the user, and the CPU 503 receives the signal and generates a serial signal according to the RS232C standard. , Terminal 5031.

Here, the CPU 503 generates a synchronous clock signal for transmitting a serial signal by appropriately dividing the frequency of the clock signal as the operation clock signal input to the terminal 5032 and synchronizing with the synchronous clock signal. Outputs a serial signal. The serial signal output by the CPU 503 is supplied to the main body of the mobile phone through the earphone terminal 151. In the main body of the mobile phone, the waveform shaping circuit 111 receives the serial signal. Since the serial signal conforms to the RS232C standard as described above, the amplitude is ± 12 V. First, the amplitude of the serial signal is limited to about 3.6 V by the zener diode 402 in the waveform shaping circuit 111, 403 supplies only the positive voltage to the Schmitt buffer 405. The Schmitt buffer 405 performs waveform shaping and
Output to 112.

When receiving a serial signal from the Schmitt buffer 405 whose waveform has been shaped, the CPU 112 converts the serial signal into a parallel signal by a built-in peripheral circuit and holds the converted signal as character code information. After that, when the user continuously operates the keyboard 110 to enter kana characters,
The CPU 503 generates a serial signal representing each kana character and outputs the serial signal to the main body of the mobile phone through the earphone terminal 151, as in the case described above. Then, in the main body of the mobile phone, the waveform shaping circuit 111 shapes the waveform of each serial signal and
This is supplied to the PU 112, and the CPU 112 converts the serial signal into a parallel signal and holds it as character code information. The character code information is stored in a memory (not shown) together with the telephone number as, for example, the name information of the other party.

As described above, in the present embodiment, the kana character can be input to the mobile phone main body using the keyboard 110 in which one key 30 corresponds to one kana character. Compared to a case where a small number of keys are used to input a kana character, a kana character can be input extremely easily and in a short time without any trouble. Since only small-scale circuits such as a clock generation circuit and a waveform shaping circuit are added to the main body of the mobile phone, the main body of the mobile phone is not particularly increased in size and weight, and the cost is slightly increased. is there. Further, in the present embodiment, the keyboard uses the power by rectifying the clock signal, so that it is not necessary to provide the keyboard with a power supply such as a battery. Further, since the earphone microphone jack is used to connect the keyboard, it is not necessary to newly add a connector or the like to the mobile phone body.

Further, in this embodiment, since a keyboard made of a sheet film is used, it can be rolled up like a scroll when not in use, as shown in FIG. Can be easily performed. In the present embodiment, a serial signal of the RS232C standard is used. As a result, in designing and manufacturing a keyboard, information on the configuration of the mobile phone main body is unnecessary, and a manufacturer other than the mobile phone manufacturer is not required. But it can produce keyboards that meet a variety of needs. In addition, any serial signal conforming to the RS232C standard can be taken into the portable telephone body, so that, for example, a personal computer can be connected instead of a keyboard, and information can be input from the personal computer.

In this embodiment, kana characters are input. However, in addition to kana characters, various characters and symbols such as alphabets, symbols, and numbers can be input. It is also possible to make the keyboard connected to the mobile phone main body, for example, a keyboard, and associate the tones constituting the musical scale with the serial signal so that the melody of the ringtone can be input and registered arbitrarily. is there.

Further, in this embodiment, the serial signal conforms to the RS232C standard, but the present invention is also effective when a serial signal other than the RS232C standard is used. In this embodiment, the serial signal is input to the mobile phone main body through the earphone terminal, and the clock signal is output through the microphone terminal. On the contrary, the serial signal is input to the mobile phone main body through the microphone terminal. On the other hand, a configuration in which a clock signal is output through an earphone terminal is also possible.

The present invention is of course effective even when the microphone terminal and the earphone terminal are not integrated.

[0035]

As described above, according to the present invention, for example, a keyboard or the like for outputting a signal representing an operated key in the form of a serial signal is connected through the first and second terminals, and a kana character is output from the keyboard. And so on. In that case, the output of the keyboard is connected to the second terminal, and the serial signal from the keyboard is supplied to the waveform shaping circuit through the second terminal and shaped. The serial signal after the waveform shaping is, for example, C
The signal is converted into a parallel signal by the PU, and a kana character or the like can be specified. The clock signal generated by the clock generation circuit is input to the keyboard through the first terminal, so that the keyboard can generate a serial signal in synchronization with the clock signal. In a keyboard, this clock signal can be rectified to be used as a power source.

That is, according to the present invention, for example, a kana character can be input to the mobile terminal device main body using a keyboard in which one key corresponds to one kana character. Compared to a case where a small number of keys are used to input a kana character, a kana character can be input very easily and in a short time without any trouble. Since only small-scale circuits such as a clock generation circuit and a waveform shaping circuit are added to the mobile terminal device main body, the mobile terminal device main body does not become particularly large or heavy, and cost is reduced. Up is also slight. Furthermore, in the present invention, for example, when a keyboard is used, the keyboard can be used as a power source by rectifying a clock signal, so that there is no need to provide a power source such as a battery for the keyboard. Further, since the earphone terminal and the microphone terminal are used for connection of the keyboard and the like, it is not necessary to newly add a connector or the like to the mobile terminal device body.

[Brief description of the drawings]

FIG. 1 is a main block diagram showing an example of a mobile phone according to the present invention.

FIG. 2 is a circuit diagram illustrating a waveform shaping circuit included in the mobile phone according to the embodiment;

FIG. 3 is a block diagram showing only components related to an earphone microphone among components of the mobile phone shown in FIG. 1;

FIG. 4 is a main block diagram showing an overall configuration when a microphone and an earphone are connected to a microphone terminal and an earphone terminal, respectively.

FIG. 5 is a schematic block diagram illustrating a configuration of a keyboard connected to a mobile phone main body.

6A and 6B are external views of a keyboard, in which FIG. 6A is an external view showing a state in which the keyboard is rolled up like a scroll, and FIG. 6B is an external view showing a state in which the keyboard is expanded for use.

[Explanation of symbols]

2 ... mobile phone, 4 ... ground, 6 ... input terminal,
10: Mobile phone body, 11: Receiver amplifier, 1
2 ... condenser, 13 ... earphone, 14 ... microphone, 15 ... earphone microphone jack, 16 ... resistor,
18 microphone amplifier, 19 receiving circuit, 20 transmitting circuit, 22 rectifying circuit, 24 keyboard body,
26 ... cable, 28 ... plug, 30 ... key, 3
2... Derived points, 110... Keyboard, 111... Waveform shaping circuit, 112... CPU, 113.
113A ... common terminal, 113B ... terminal, 113C ...
... Terminals, 114, resistors, 115, clock generation circuit, 151, earphone terminal, 152, ground terminal, 153, microphone terminal, 154, ground terminal,
401: resistor, 402: Zener diode, 40
3. Diode, 404, resistor, 405, Schmitt buffer, 501, diode, 502, capacitor, 503, CPU, 504, keyboard circuit, 5031, serial out terminal, 5032, operating clock signal Input terminal, 5033 ... Power supply terminal, 50
34 Ground terminal.

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H04M 1/00-1/24 H04M 1/58-1/62 H04M 1/66-1/78 H04M 11 / 00-11/10

Claims (8)

(57) [Claims] An audio signal received from a communication partner, comprising: a first terminal that is one of an earphone terminal and a microphone terminal; and a second terminal that is the other of the earphone terminal and the microphone terminal. Is a mobile terminal device that is output through the earphone terminal and an audio signal input through the microphone terminal is transmitted to a communication partner, a clock generation circuit that generates a clock signal and outputs the clock signal through the first terminal; A mobile terminal device, comprising: a waveform shaping circuit for receiving a serial signal input through the second terminal and synchronized with the clock signal, and shaping the waveform of the serial signal. 2. When outputting the clock signal, an output terminal of the clock generation circuit is connected to the first terminal, and a connection between another circuit in the mobile terminal device and the first terminal is disconnected. 2. The mobile terminal device according to claim 1, further comprising a switch for performing the operation. 3. The waveform shaping circuit is connected between a resistor connected in series to the second terminal, and a terminal of the resistor opposite to the second terminal and a reference potential point. 2. The mobile terminal device according to claim 1, further comprising a Zener diode. 4. The mobile terminal device according to claim 1, wherein the first and second terminals are attached to a housing as an integrated jack. 5. A keyboard comprising a keyboard main body, a cable led out from the keyboard main body, and a terminal attached to an end of the cable, wherein a terminal of the keyboard is connected to the first and second terminals. The keyboard rectifies the clock signal supplied through the first terminal to generate power, and inputs the serial signal synchronized with the clock signal to the mobile terminal device main body through the second terminal. The mobile terminal device according to claim 4, wherein: 6. The mobile terminal device according to claim 5, wherein the keyboard is a touch key type keyboard, and a main part of the keyboard body is formed of a film sheet. 7. The mobile terminal device according to claim 1, wherein the serial signal is a signal according to the RS232C standard. 8. The mobile terminal device according to claim 1, further comprising a CPU, wherein an output signal of the waveform shaping circuit is supplied to the CPU.