JP2002152078A - Portable telephone set - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a portable telephone set whose transmission/reception characteristic is good by discriminating whether a user uses the portable telephone set by putting it to his ear and impedance-matching an antenna part and a radio part in accordance with a discriminated state. SOLUTION: It is discriminated whether the user uses the portable telephone set by putting it on his ear by a call detecting means detecting whether a system is in the middle of communication or not and a handsfree detecting means detecting whether a handsfree function is used or not. Impedance viewed from the radio part side of the antenna part is matched with impedance viewed from the antenna part side of the radio part in accordance with discrimination. Thus, the transmission/reception characteristic of the portable telephone set is kept to be optimum when the user uses the set by putting it to his ear or when the user uses it without putting it to his ear.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a portable telephone used in, for example, a mobile communication system.

[0002]

2. Description of the Related Art In a portable telephone, an impedance matching circuit is provided between an antenna unit and a radio unit. , The transmission / reception signal output of the wireless unit is set to be the highest.

[0003] However, during a call, when the mobile phone is placed on the ear, the impedance as viewed from the radio part side of the antenna part is initially matched due to the effect of the part closely above the neck of the human body. Deviates from the value of.

[0004] As a result, the impedance value of the antenna unit as viewed from the radio unit side shifts, so that the impedance of the antenna unit does not match the impedance of the radio unit, so that the reception sensitivity of the mobile phone deteriorates and the transmission output decreases. There was a problem.

In order to solve this problem, a technique has been proposed in which an impedance matching circuit is switched by using a control signal to match the impedance to the shifted value, thereby preventing deterioration of transmission / reception performance.

[0006] In order to switch the impedance matching circuit, it is necessary to detect that the portable telephone is used while being worn on the ear. Conventionally, in order to detect that the earphones are being used, the state of the call is determined. Was.

Also, as disclosed in Japanese Patent Application Laid-Open No. 11-177485,
It has also been proposed to determine whether the user is talking or waiting by pressing a call key or an end key.

[0008]

By the way, in recent years, the usage status of a portable telephone is not always that the portable telephone is used with the ear in use, even during a call. For example, it can be seen that a hands-free kit such as an earphone microphone is used while using data communication such as the Internet or e-mail or driving a car.

When the technique disclosed in Japanese Patent Application Laid-Open No. 11-177485 is adopted, that is, when a call key or an end key is pressed, it is determined whether a call is being made or a call is waiting, and the portable telephone is put on the ear. When matching the impedance seen from the wireless part side of the antenna part with the impedance seen from the wireless part antenna side, when the earphone microphone is used, it is not put on the ear, so the antenna part and the wireless part However, there is a problem in that the impedance matching is not optimal and the transmission / reception performance deteriorates.

Therefore, a first problem to be solved by the present invention is to determine whether or not a user is using a portable telephone with his / her ear in contact, and to correspond to the determined state, to communicate with the antenna unit and the radio. It is an object of the present invention to provide a mobile phone having good transmission / reception characteristics by taking impedance matching with a unit.

A second object is to provide a portable telephone which can reduce power consumption.

[0012]

SUMMARY OF THE INVENTION The first object of the present invention is to provide a portable telephone with a hands-free means, and when the hands-free means is not used, the portable telephone is in close contact with a human body. The impedance seen from the radio side of the antenna unit is matched with the impedance seen from the antenna side of the radio unit, and when the hands-free means is used, the radio of the antenna unit in a state where the mobile phone is away from the human body is A mobile phone characterized by comprising matching means for matching the impedance seen from the unit side with the impedance seen from the antenna side of the wireless unit.

Further, in the portable telephone, a hands-free means, a hands-free detecting means for detecting whether or not the hands-free means are used, and a case where the hands-free detecting means detects that the hands-free means are not used. In the state where the mobile phone is in close contact with the human body, the impedance seen from the wireless part side of the antenna unit is matched with the impedance seen from the antenna side of the wireless part,
When the hands-free detecting means detects that the hands-free means is used, the impedance when viewed from the wireless part side of the antenna unit and the impedance when viewed from the antenna side of the wireless part when the mobile phone is away from the human body. And a matching means for matching the impedance with the mobile phone.

Also, in the portable telephone, a call detecting means for detecting whether or not a call is being made, a hands-free means,
A hands-free detecting means for detecting the use of the hands-free means, and, when the call detecting means detects that the telephone is not in use, the mobile phone is viewed from the wireless part side of the antenna part in a state where it is away from the human body. The impedance is matched with the impedance seen from the antenna side of the wireless unit, and when it is detected by the call detecting means that a call is in progress, it is detected that the hands-free means is not used by the hands-free detecting means. When the mobile phone is in close contact with the human body, the impedance of the antenna unit as viewed from the radio unit side is matched with the impedance of the radio unit as viewed from the antenna unit side, and the hands-free detection unit detects the hands-free unit. If the mobile phone is detected as being It is solved by a mobile telephone, characterized in that it comprises a matching means for matching the impedance viewed from the antenna side impedance and radio section when viewed from the wireless side of the antenna unit in the state of being.

[0015] The second problem is a portable telephone capable of saving power consumption of the portable telephone, and a telephone call detecting means for detecting whether or not a telephone call is in progress, and a telephone call by the telephone call detecting means. Is detected, the disconnection means for disconnecting a part or all of the power supply of the backlight circuit and / or the display unit circuit is solved.

Also, the present invention is a portable telephone capable of saving power consumption of the portable telephone, wherein a telephone call detecting means for detecting whether a telephone call is in progress, a hands-free means, and a telephone call is detected by the telephone call detecting means. And a disconnecting means for cutting off the power of a backlight circuit and / or a part of the display circuit when the hands-free means is not used. Solved by

A portable telephone capable of saving power consumption of the portable telephone, comprising: a telephone call detecting means for detecting whether a telephone call is being made, a hands-free means, and a hands-free means for detecting whether or not the hands-free means are used. Free detection means, when it is detected that the call is detected by the call detection means, and when it is detected by the hands-free detection means that the hands-free means is not used, a backlight circuit and Alternatively, there is provided a mobile phone having a disconnecting means for disconnecting a part or all of the power supply of the display unit circuit.

In the present invention, the call detecting means includes, for example, an AD conversion detecting means, and the hands-free detecting means includes, for example, an earphone microphone mounting detecting means.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a portable telephone according to an embodiment of the present invention will be described in detail with reference to the drawings.

FIGS. 1 to 3 show an embodiment of a digital portable telephone according to the present invention. FIG. 1 is a block diagram showing a configuration of the mobile phone according to the embodiment of the present invention. FIG. 2 is a circuit diagram of the impedance matching unit.
FIG. 3 is a flowchart showing the operation of the present invention.

The portable telephone of the present invention has an antenna section 101.
, An impedance matching unit 102, a radio unit 103,
D / A converter (A / D converter) 104 and AD conversion detecting means 1
05, an earphone microphone jack 106, a hands-free detecting means 107, a control unit 108, and a power control unit 10
9, a display unit 110, and a backlight unit 111.

The antenna section 101 receives a radio wave signal transmitted from a communication network, or transmits a radio wave signal to a partner via a communication network. The impedance matching unit 102 performs impedance matching between the impedance of the antenna unit 101 viewed from the wireless unit side and the impedance of the wireless unit 103 viewed from the antenna side. The wireless unit 103 demodulates a signal received from the antenna unit 101 or modulates transmission data for transmission to a partner via a communication network. The antenna unit 101 is configured on the antenna side of the wireless unit 103 of the mobile phone, and is configured by excluding the impedance matching circuit. D / A converter (A / D converter) 10
Numeral 4 is for converting digital voice data into an analog signal (converting an analog signal into digital voice data).

The AD conversion detecting means 105 includes a D / A converter (A
/ D converter) 104.

An earphone microphone jack 106 is a jack for attaching and detaching an earphone microphone.

The hands-free detecting means 107 detects whether or not the hands-free means is used by detecting whether or not the earphone microphone is attached to the earphone microphone jack 106.

The control unit 108 controls the entire portable telephone, and is composed of a microcomputer and its related circuits. The power control unit 109, the display unit 110, and the backlight unit 111 will be described later.

Next, an example of the impedance matching circuit 102 will be described with reference to FIG.

In this example, the impedance matching circuit 10
2 includes a capacitor 201, a capacitor 202, a capacitor 203, a PIN diode 204, and a current limiting resistor 205.

When a current exceeding a certain value flows through the PIN diode 204, the resistance value of the PIN diode 204 decreases and the potential of the anode side 206 becomes the ground level, so that the capacitor 203 is equivalent to being connected to the ground. Becomes If a current of a certain value or more does not flow through the PIN diode 204, the resistance of the PIN diode 204 becomes very large, which is equivalent to the case where the capacitor 203 is not connected to the ground.

Accordingly, since the output terminal of the control unit 108 is connected to the PIN diode 204 via the current limiting resistor 205, the impedance of the impedance matching unit 102 can be changed by the output signal from the control unit 108. That is, by appropriately selecting the capacity of the capacitor 201, the capacitor 202, and the capacitor 203,
There are two types of impedance, and impedance matching between the impedance of the antenna unit 101 viewed from the wireless unit side and the impedance of the wireless unit 103 viewed from the antenna side can be achieved.

Next, the operation of the portable telephone according to the present invention will be described with reference to FIG.

The mobile phone is in a standby state when not talking (S101). From this standby state, the line is connected by calling or receiving (S102). When the line is connected, the flow shifts to (S103) during a call. When a voice call is made during a call (S103), the voice signal of the call partner is received by the antenna unit 101,
After necessary conversion, the signal is converted into an analog signal by the D / A converter 104. The user's own voice is collected by the microphone of the mobile phone, and the voice signal input as an analog signal is converted into a digital signal by the A / D converter 104. When the D / A conversion or the A / D conversion is performed, the AD conversion detection unit 105 detects whether the conversion has been performed (S104 or S105). If A / D conversion or D / A conversion has been performed, the result is Yes. If neither the A / D conversion nor the D / A conversion is performed, the result is No.

In the case of Yes in the above, the wearing condition of the earphone microphone is detected by the hands-free detecting means 107 (S106).

When the A / D conversion or the D / A conversion has been performed is detected by the AD conversion means 105, and when the earphone microphone is not attached and the hands-free detection means detects that the earphone / microphone is not attached, the portable telephone is heard. When it is determined that the mobile phone is in contact with the mobile phone, the impedance viewed from the wireless unit side of the antenna unit 101 and the impedance viewed from the antenna side of the wireless unit 103 when the mobile phone is in close contact with the human body are matched by the impedance matching unit 102. (S10
7).

When the AD converter 105 detects that neither the A / D conversion nor the D / A conversion is performed, or when the hands-free detector detects that the earphone microphone is attached. Determines that the mobile phone is not in use or talking with the mobile phone in contact with the ear, and determines the impedance and the wireless unit 10 when viewed from the wireless unit side of the antenna unit 101 when the mobile phone is away from the human body.
The impedance of the third antenna is matched by the impedance matching unit 102 (S108).

After the above-mentioned matching, the line status is checked (S109). If the line is connected, the process enters into a call (S103).

If the line is disconnected, the impedance matching unit 102 matches the impedance of the antenna unit 101 as viewed from the wireless unit side and the impedance of the wireless unit 103 as viewed from the antenna side when the mobile phone is away from the human body. (S110). After the above-mentioned alignment, the apparatus enters a standby state (S101). This is because the mobile phone is not usually put on the ear in the standby state.

As described above, it is determined whether or not the user is using the mobile phone with the user's ear in use, and the antenna unit 101 and the radio unit 103 are associated with the determined state.
, The transmission and reception characteristics are improved regardless of the state of hands-free use.

Next, an embodiment for providing a portable telephone which can reduce power consumption, which is the second problem, will be described.

As described above, it is possible to determine whether or not the mobile phone is being used while being held against the user's ear by utilizing the call detecting means and the hands-free detecting means.

By the way, when the user is talking on the mobile phone with his / her ear, the display on the mobile phone cannot be seen. Therefore, power required only for display is wasted.

For this reason, it is preferable to turn off the power supply related to these.

The power control section 109 controls the power of the display section 110 and the backlight section 110 according to an instruction from the control section 108.

The display unit 109 displays various information of the mobile phone, and the backlight unit 111 emits light from behind the display unit when it is dark to make the display unit easier to see.

In the above description, if it is determined that the call is detected by the call detecting means, and if it is determined that the hands-free means is not used, the user places the portable telephone on his / her ear. Corresponds to when talking. Therefore, in this case, a signal is sent from the control unit 108 to the power supply control unit 109, and the display unit 110 and the backlight unit 111
If the power supply required only for the display is turned off, the power consumption can be reduced.

In the above embodiment, an example has been described in which the present invention is implemented by software using a microcomputer. However, the present invention can be implemented by logic of an electronic circuit.

A / D conversion detecting means 10 for detecting whether or not the call detecting means is performing conversion of the A / D converter.
Although the description has been made with reference to FIG. 5, it is also possible to use other means such as voice recognition means. Further, an example has been described in which the hands-free detection means 109 is performed by detecting whether or not the earphone microphone is mounted, but it is also possible to use optical means such as an optical sensor.

Although the above description has been made with reference to voice signals generated by telephone calls, digital signals from the Internet or the like can be used in the same manner.

[0049]

According to the present invention, it is determined whether or not the portable telephone is in use with the user's ear in use, and impedance matching between the antenna unit and the radio unit is performed in accordance with the determined state. be able to. Therefore, it is possible to provide a mobile phone having good transmission / reception characteristics even during a call using the earphone microphone or during a call other than the above.

In addition, since the power consumption of the display when talking with the ear can be reduced, a portable telephone which can be used for a longer time with one charge can be provided.

[Brief description of the drawings]

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

FIG. 2 is a circuit diagram of an impedance matching unit.

FIG. 3 is a flowchart showing the operation of the present invention.

[Explanation of symbols]

 Reference Signs List 101 Antenna unit 102 Impedance matching unit 103 Wireless unit 104 D / A converter (A / D converter) 105 AD conversion detection unit 106 Earphone microphone jack 107 Hands-free detection unit 108 Control unit 109 Power supply control unit

Claims (8)

[Claims] 1. A portable telephone, comprising: a hands-free means; and, when the hands-free means is not used, an impedance and a radio section of the antenna section viewed from a radio section side in a state in which the mobile phone is in close contact with a human body. When the hands-free means is used, the impedance as viewed from the radio unit side of the antenna unit and the radio unit from the antenna side when the mobile phone is away from the human body are matched. A mobile phone, comprising: a matching unit for matching the impedance with the mobile phone. 2. A portable telephone, wherein a hands-free means, a hands-free detecting means for detecting whether the hands-free means are used, and a case where the hands-free detecting means detects that the hands-free means are not used. In a state where the mobile phone is in close contact with the human body, the impedance of the antenna unit as viewed from the radio unit side is matched with the impedance of the radio unit as viewed from the antenna side, and the hands-free detection unit uses the hands-free unit. Matching means for matching the impedance seen from the radio side of the antenna unit with the impedance seen from the antenna side of the radio unit when the mobile phone is away from the human body when it is detected that A mobile phone characterized by the following. 3. A mobile phone, comprising: a telephone call detecting means for detecting whether or not a telephone call is in progress; a hands-free means; a hands-free detecting means for detecting whether or not the hands-free means are used; If it is detected that the telephone is not in a call, the impedance as viewed from the radio unit side of the antenna unit and the impedance as viewed from the antenna side of the radio unit when the mobile phone is away from the human body are matched, and the call detection unit When it is detected that the telephone is busy, and when the hands-free detecting means detects that the hands-free means are not used, the radio unit of the antenna unit in a state where the mobile phone is in close contact with the human body The impedance seen from the side and the impedance seen from the antenna part side of the radio unit are matched, and -When the detecting means detects that the hands-free means is used, the impedance is viewed from the radio section side of the antenna section and the radio section is viewed from the antenna section side when the mobile phone is away from the human body. A mobile phone comprising: a matching unit that matches impedance. 4. A mobile phone capable of saving power consumption of the mobile phone, wherein a call detecting means for detecting whether or not a call is in progress, and when the call detecting means detects a call, A cellular phone comprising: a disconnecting unit that disconnects a part or all of a power supply of a backlight circuit and / or a display unit circuit. 5. A mobile phone capable of saving power consumption of the mobile phone, wherein a call detection unit for detecting whether or not a call is in progress, a hands-free unit, and a call detected by the call detection unit. And a disconnecting means for cutting off a part or all of the power of the backlight circuit and / or the display circuit when the hands-free means is not used. Phone. 6. A mobile phone capable of reducing power consumption of the mobile phone, comprising: a call detecting unit for detecting whether a call is being performed; a hands-free unit; and a hands-free unit for detecting whether the hands-free unit is used. Free detection means, when it is detected that the call is detected by the call detection means, and when it is detected by the hands-free detection means that the hands-free means is not used, a backlight circuit and And / or disconnection means for disconnecting the power of a part or all of the display circuit. 7. The mobile phone according to claim 3, wherein the call detection unit is an AD conversion detection unit. 8. The method according to claim 2, wherein the hands-free detection means is an earphone microphone attachment detection means.
3. The mobile phone of claim 6 or claim 6.