JPH11177485A - Portable telephone set - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a portable telephone set with by which a desired reception characteristic is obtained, even when the line is busy. SOLUTION: This folded portable telephone set having an upper case with a receiver 13 and a lower case with a microphone 21 is provided with an antenna 12 built in the upper case, an antenna 22 built in the lower case, a built-in antenna changeover switch 30 that selects passing of a signal from either upper case built-in antenna 12 or the lower case built-in antenna 22, a radio section 32 that generates reception signals, based on signals outputted from the built-in antenna changeover switch 30, a control discrimination means 34 that discriminates whether or not the line is busy. The control discrimination means 34 supplies a signal for the lower case built-in antenna 22 to the radio section 32 when the control discrimination means 34 discriminates that the line is busy. In supplies a signal from the upper case built-in antenna 12 to the radio section 32, when it discriminates that the line is not busy, by switching the built-in antenna changeover switch 30.

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, for example, in a mobile communication system, and more particularly to a technique for realizing a good transmission / reception state using a plurality of antennas.

[0002]

2. Description of the Related Art Conventionally, a portable telephone which has a whip antenna for transmission / reception and a built-in antenna dedicated for reception, which can be pulled out from a telephone housing and accommodated in the housing, and which has a built-in antenna exclusively for reception, and which performs reception in a diversity system. It has been known. In this case, a monopole antenna is widely used as a whip antenna, and an inverted-F antenna is widely used as a built-in antenna.

[0003] On the other hand, portability of portable telephones is regarded as important. Therefore, a foldable mobile phone has been developed as shown in FIGS. 5A and 5B, for example.
The mobile phone includes an upper housing 10 and a lower housing 20. The upper housing 10 includes a whip antenna 11, a built-in antenna 12, a speaker (receiver) 13, and an operation unit 1.
4 are provided. The lower housing 20 is provided with a microphone 21.

When a call is made with this portable telephone, the upper housing 10 and the lower housing 20 are opened as shown in FIG. On the other hand, when a call is not made or carried, as shown in FIG.
Is folded. In this folded state, the mobile phone enters a standby state.

When the portable telephone is placed on a desk, for example, in a folded state, the built-in antenna 12 is located on the upper side (away from the desk surface). Therefore, it is in a state where it easily receives electromagnetic waves from the air. In addition, this mobile phone is usually carried in a pocket such that the lower housing 20 is on the side of the human body in consideration of the operation after taking out. Therefore, since the built-in antenna is separated from the human body, the influence of the human body is reduced, and preferable receiving characteristics can be obtained.

[0006]

However, during a call, the upper housing 10 and the lower housing 20 are opened, and the speaker (receiver) 13 of the upper housing 10 is pressed against the ear.
The built-in antenna 12 is also located close to the human body. Therefore, there is a problem that it is difficult to obtain preferable reception characteristics during a call.

An object of the present invention is to solve such a problem, and an object of the present invention is to provide a portable telephone capable of obtaining favorable reception characteristics even during a call.

[0008]

In order to achieve the above object, a portable telephone according to a first aspect of the present invention has a first antenna provided near a receiver and a microphone provided near a microphone. A second antenna, determining means for determining whether a call is in progress, and generating a received signal based on a signal from the first antenna when the determining means determines that the call is in progress. And a radio unit that generates a reception signal based on a signal from the second antenna when it is determined that a call is not in progress.

According to the portable telephone according to the first aspect, the first antenna is provided near the receiver, but the second antenna is provided near the microphone. The second antenna is located away from the human body. Then, a received signal is generated based on the signal from the second antenna. Therefore, the second antenna is less likely to be affected by the human body, so that good reception characteristics can be obtained.

A mobile phone according to a second aspect of the present invention is a foldable mobile phone having an upper housing having a receiver and a lower housing having a microphone for the same purpose as described above. A first antenna provided on the upper housing, a second antenna provided on the lower housing, determining means for determining whether or not a call is in progress; When it is determined that there is a signal, a received signal is generated based on the signal from the first antenna, and when it is determined that the user is not talking, a received signal is generated based on the signal from the second antenna. A wireless unit.

Further, a portable telephone according to a third aspect of the present invention is a foldable portable telephone having an upper housing having a receiver and a lower housing having a microphone for the same purpose as described above. A first antenna provided on the upper housing, a second antenna provided on the lower housing, and a signal passing through either the signal from the first antenna or the signal from the second antenna. A changeover switch for switching whether to make a call, a determination unit for determining whether or not a call is in progress with a radio unit that generates a reception signal based on a signal from the changeover switch, and the determination unit determines that the call is in progress. In such a case, the changeover switch is switched so as to supply a signal from the first antenna to the radio unit, and a signal from the second antenna is supplied to the radio unit when it is determined that a call is not being made. So that Control means for switching the switch, and a city.

According to the portable telephones according to the second and third aspects, during a call, that is, when the upper casing and the lower casing are open, a received signal is generated based on a signal from the second antenna. Generated. Since the second antenna is provided on the lower housing, the second antenna is at a position away from the human body during a call. Therefore, the second antenna is less likely to be affected by the human body, so that good reception characteristics can be obtained.

On the other hand, except during a call, that is, when the upper housing and the lower housing are folded, a reception signal is generated based on a signal from the first antenna. Since the first antenna is provided in the upper housing, the second antenna is located on the upper side (side away from the desk surface) when it is placed on a desk other than during a call. Therefore, it is in a state where it easily receives electromagnetic waves from the air. This mobile phone is usually carried in a pocket such that the lower housing is on the side of the human body. Therefore, since the second antenna is separated from the human body, the influence of the human body is reduced, and favorable reception characteristics can be obtained.

In the portable telephone according to the first to third aspects, the first antenna and the second antenna can be reception-only antennas. According to this configuration, a signal from an antenna having good reception characteristics and a separately provided transmission / reception antenna can be received in a diversity system, so that better reception quality can be obtained.

Further, in the portable telephone according to the first to third aspects, the determination means may be configured to determine that a telephone call is being performed during a period from when a line is connected to when the line is disconnected. According to this configuration, the second antenna that is hardly affected by the human body is used only during an actual call,
Since the first antenna is used except during a call, that is, in a standby state, reception quality in the standby state can be improved.

Further, in the portable telephone according to the second and third aspects, the mobile phone is closed when the upper housing and the lower housing are closed, and the upper housing and the lower housing are closed. The system may further include a switch that is opened when the switch is opened, and determines that a call is in progress while the switch is open. According to this configuration, it is possible to determine whether or not a call is in progress despite the simple structure.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 of a mobile phone according to the present invention will be described below in detail with reference to the drawings. In the following, a mobile phone configured according to the RCR-STD 27 “digital car phone” will be described as an example.

FIG. 1 is an external perspective view of a portable telephone according to Embodiment 1 of the present invention. FIG. 1 (A) shows an opened state, and FIG. 1 (B) shows a folded state. Except for the addition of the lower housing built-in antenna 22, the structure of the mobile phone is the same as the conventional mobile phone described above with reference to FIG. Therefore, the same or corresponding parts as those of the above-described conventional mobile phone are denoted by the same reference numerals.

FIG. 2 is a block diagram showing a configuration of an electronic circuit of the mobile phone according to the first embodiment of the present invention. This mobile phone includes a whip antenna 11, an upper housing built-in antenna 12, a speaker 13, an operation unit 14, a microphone 21, a lower housing built-in antenna 22, a built-in antenna changeover switch 30, a diversity switch 31, a radio unit 32, and a modem unit 33. , A control unit 34 and an audio processing unit 35.

The upper housing built-in antenna 12 is a reception-only antenna, and is constituted by, for example, an inverted F-type antenna. As shown in FIG. 1, the upper housing built-in antenna 12 is built in the upper housing 10, converts a received electromagnetic wave into an electric signal, and supplies the electric signal to a terminal A <b> 1 of the built-in antenna changeover switch 30.

The lower housing built-in antenna 22 is a reception-only antenna, and is constituted by, for example, an inverted F-type antenna. As shown in FIG. 1, the lower housing built-in antenna 22 is built in the lower housing 20, converts a received electromagnetic wave into an electric signal, and supplies the electric signal to a terminal B 1 of the built-in antenna changeover switch 30.

The built-in antenna changeover switch 30 is constituted by a two-contact switch, and its common terminal C1 is connected to either the terminal A1 or the terminal B1 in response to a control signal SS1 from the control unit 34. The common terminal C1 is connected to the terminal B2 of the diversity switch 31. Therefore, according to the control signal SS1 from the control unit 34, either the signal from the upper housing built-in antenna 12 or the signal from the lower housing built-in antenna 22 is changed to the terminal B of the diversity switch 31.
2 is supplied.

The whip antenna 11 is an antenna commonly used for both transmission and reception, and is composed of, for example, a monopole antenna. This whip antenna 11
As shown in FIG. 1, is configured to be able to be pulled out from the upper housing 10 and housed inside the upper housing 10. This whip antenna 11
Converts the received electromagnetic wave into an electric signal and supplies it to the terminal A2 of the diversity switch 31;
From the terminal A2 of the diversity switch 31 to the air.

The diversity switch 31 is used to switch between the branch on the whip antenna 11 side and the branches on the upper housing built-in antenna 12 and the lower housing built-in antenna 22 immediately before the reception slot. That is, the diversity switch 31 is formed of a two-contact switch, and the common terminal C2 is connected to either the terminal A2 or the terminal B2 in response to the control signal SS2 from the control unit 34. The common terminal C2 of the diversity switch 31 is connected to the radio unit 32. Therefore, either the signal from the whip antenna 11 or the signal from the built-in antenna switch 30 is supplied to the wireless unit 32 according to the control signal SS2 from the control unit 34.

The radio section 32 transmits a radio frequency band signal transmitted from the whip antenna 11 via the diversity switch 31 or a radio frequency signal transmitted from the upper housing built-in antenna 12 or the lower housing built-in antenna 22 to the built-in antenna changeover switch 30 and the diversity. A signal component is extracted from the radio frequency band signal transmitted through the switch 31 and is
To supply. The wireless unit 32 supplies the modulated signal from the modulation / demodulation unit 33 to the whip antenna 11 via the diversity switch 31. The operation of the wireless unit 32 is controlled according to a signal from the control unit 34.

The modulation / demodulation unit 33 demodulates the signal from the radio unit 32. By this demodulation, control data, audio data, and the like are obtained. The control data obtained by the modem 33 is supplied to the controller 34, and the audio data is supplied to the audio processor 35. The modulation / demodulation unit 33 modulates control data from the control unit 34 and audio data from the audio processing unit 35. The modulated control data and audio data are supplied to the radio unit 32.

The control unit 34 controls the entire mobile phone. In other words, the control signals SS1 and SS2 are generated and supplied to the built-in antenna changeover switch 30 and the diversity switch 31, respectively, thereby performing the selection of the built-in antenna and the diversity control. It also controls the operation of the radio unit 32, controls the transmission and reception of control data to and from the modem unit 33, controls the supply of data to the audio processing unit 35, and controls the transmission and reception of data to and from the operation unit 14. Control.

The speaker 13 and the microphone 21 as receivers are connected to the audio processing unit 35. The voice processing unit 35 generates a voice signal based on the voice data from the modem unit 33, a ring tone signal based on the data from the control unit 34, a warning signal, and the like. These signals are supplied to the speaker 13. As a result, a sound is emitted from the speaker 13, and a ringing sound and a warning sound are emitted. Also,
The audio processing unit 35 generates audio data based on an audio signal from the microphone 21. The audio data is supplied to the modem 33.

The operation unit 14 includes a switch and a display device (not shown). The switch is used, for example, for inputting a telephone number, setting an operation mode, registering various data, and the like. The display device is used to display messages such as date, time, registered data, radio wave state, and the like in characters and pictures. Data input using the switches of the operation unit 14 is supplied to the control unit 34. In addition, display data is supplied from the control unit 34 to the display device of the operation unit 14.

The operation of the portable telephone in the above configuration will be described with reference to the flowchart of FIG.
Note that the processing shown in this flowchart is performed by the control unit 34, and only processing centering on the selection operation of the built-in antenna is shown. It is assumed that the built-in antenna switch 30 has selected the upper housing built-in antenna 12 except during a call.

The control unit 34 first checks whether a dial operation has been performed (step S10).
That is, it is checked whether or not the telephone number of the call partner has been input by a switch (not shown) of the operation unit 14. Here, if it is determined that the dial operation has not been performed, step S10 is repeatedly executed, and a so-called standby state is formed.

In this standby state (during execution of step S10), if it is determined that a dial operation has been performed, a line connection process is started (step S10).
11). Next, a process of generating a ringing tone is performed (step S12). That is, the control unit 34 sends predetermined data to the audio processing unit 35. As a result, a ringing tone is generated from the speaker 13, so that the user can know that the call is currently being made.

Next, it is checked whether the line connection has been completed (step S13). Here, if it is determined that the processing is not completed, the process returns to step S12, and the same processing is repeated again. The function of waiting for the line connection to be completed while generating a ringing tone is realized by the repetition of steps S12 and S13.

If it is determined in step S13 that the line connection has been completed in the course of repeatedly executing steps S12 and S13, then the lower housing built-in antenna 22 is selected (step S14). That is, the control unit 34 activates the control signal. As a result, the common terminal C1 of the built-in antenna switch 30 is connected to the terminal B1, and the lower housing built-in antenna 22 is selected. Thus, diversity reception using the whip antenna 11 and the lower housing built-in antenna 22 is performed.

Next, a call process is performed (step S).
15). That is, in the radio unit 32, a significant signal is extracted from the signal received by the whip antenna 11 or the lower housing built-in antenna 22 and supplied to the modem 33. The modulation / demodulation unit 33 demodulates a signal from the wireless unit 32 and supplies the demodulated signal to the audio processing unit 35 as audio data. Audio processing unit 35
Then, an audio signal is generated based on the audio data and supplied to the speaker 13. This allows the speaker to hear the voice from the other party.

The voice signal generated by the microphone 21 when the speaker speaks is supplied to the voice processing unit 35. The audio data is converted into audio data by the audio processing unit 35 and supplied to the modulation / demodulation unit 33. Modem 33
Modulates this audio data and supplies it to the whip antenna 11 via the radio unit 32. As a result, the voice generated by the speaker is emitted from the whip antenna 11 into the air as electromagnetic waves.

Next, it is checked whether or not the call has ended (step S16). This is performed, for example, by checking whether a predetermined switch of the operation unit 14 has been pressed. When it is determined that the call has not been completed, the process returns to step S15, and the same processing is repeated again. The function of continuing the call is realized by the repetition of steps S15 and S16.

In the course of the repetition of steps S15 and S16, if it is determined that the call has ended, a line disconnection process is performed (step S17). Next, the upper housing built-in antenna 12 is selected (step S1).
8). That is, the control unit 34 makes the control signal non-active. Thereby, the common terminal C1 of the built-in antenna changeover switch 30 is connected to the terminal A1, and the upper housing built-in antenna 12 is selected. Thereby, the whip antenna 11
And a state in which diversity reception using the upper housing built-in antenna 12 is performed. Thereafter, the sequence returns to step S10, and enters a standby state.

Although not shown in the flowchart, diversity reception is performed as follows. That is, the diversity switch 31 switches between the branch on the whip antenna 11 side and the branch on the upper housing built-in antenna 12 and the lower housing built-in antenna 22 side immediately before the reception slot. Then, the signal received at each branch is input to the radio unit 32 and its level is measured.

The control section 34 fixes the diversity switch 31 by making the control signal SS2 active or inactive for one reception slot so as to receive the signal on the branch having the higher level as a result of the measurement. Here, one reception slot is one third of 20 mS. Further, immediately before the reception slot refers to a period from 1 mS before the start of the reception slot to the start of reception.

As described above, according to the wireless telephone of the first embodiment, reception is performed using the antenna 22 provided in the lower housing 20 provided in the lower housing 20 during a call. Other than during a call, such as during processing, reception is performed using the upper housing built-in antenna 12 provided in the upper housing 10. Therefore, during a call, the reception-only built-in antenna is located at a position away from the human body, so that deterioration of characteristics when the receiver is put on the ear is reduced, and a good reception state is obtained. In addition, the reception level is high when the user is not talking (for example, while waiting), for example, when the mobile phone is placed on a desk or in a pocket or the like.

In the first embodiment described above, only the processing when a call is made from a mobile phone has been described.
Even if there is an incoming call, the lower housing built-in antenna 22
Can be used to perform reception. In this case, similarly to the above-described processing at the time of calling, the reception may be performed using the lower housing built-in antenna 22 only while the line is connected.

In the first embodiment described above, reception is performed using the lower housing built-in antenna 22 only while the line is connected. Conversely, the upper housing is used only when the mobile phone is in the standby state. It can be configured to receive using the built-in antenna 12. In this case, for example, the upper housing built-in antenna 12 may be selected immediately before step S10 shown in FIG. 3, and the lower housing built-in antenna 22 may be selected immediately after step S10.

Next, a mobile phone according to Embodiment 2 of the present invention will be described. In this mobile phone, a microswitch is used to determine whether or not a line is being connected, in order to determine whether or not a call is in progress.

FIG. 4 is an external perspective view of the mobile phone according to the second embodiment. This mobile phone is configured by adding a microswitch 15 and a pressing portion 23 to the mobile phone according to the first embodiment. That is, the microswitch 15 is provided at a predetermined portion of the upper housing 10,
A pressing portion 23 is provided at a position of the lower housing 20 that comes into contact with the microswitch 15 when folded.

The microswitch 15 is connected to the upper housing 10
In a state where the lower switch 20 and the lower housing 20 are open, the protrusion (not shown) of the microswitch 15 is released from the pressing portion 23 to be turned off. On the other hand, the upper housing 10 and the lower housing 20
In the state in which is folded, the projection of the microswitch 15 is pressed by the pressing portion 23 to be turned on. The signal from the microswitch 15 is configured to be supplied to the control unit 34. The on / off relationship of the microswitch 15 may be reversed.

In the above configuration, the state of the microswitch 15 is checked at any time during the series of procedures performed by the control unit 34, and if the microswitch 15 is on, the antenna 12 with the upper housing built-in is selected and turned off. In this case, the lower housing built-in antenna 22 may be selected. Accordingly, the lower housing built-in antenna 22 is used when the upper housing 10 and the lower housing 20 are opened, and the upper housing built-in antenna 12 is used when these are folded. Thus, the same effect as in the first embodiment can be obtained.

[0048]

As described in detail above, according to the present invention,
It is possible to provide a mobile phone capable of obtaining favorable reception characteristics even during a call.

[Brief description of the drawings]

FIG. 1 is an external perspective view of a mobile phone according to Embodiment 1 of the present invention.

FIG. 2 is a block diagram showing a configuration of an electronic circuit of the mobile phone according to Embodiment 1 of the present invention.

FIG. 3 is a flowchart showing an operation of the mobile phone according to the first embodiment of the present invention.

FIG. 4 is an external perspective view of a mobile phone according to Embodiment 2 of the present invention.

FIG. 5 is an external perspective view of a conventional mobile phone.

[Explanation of symbols]

 REFERENCE SIGNS LIST 10 upper housing 11 whip antenna 12 upper housing built-in antenna 13 speaker (receiver) 14 operation unit 15 micro switch 20 lower housing 21 microphone 22 lower housing built-in antenna 23 pressing unit 30 built-in antenna changeover switch 31 diversity switch 32 wireless unit 33 modulation / demodulation unit 34 control unit 35 audio processing unit

──────────────────────────────────────────────────の Continued on front page (51) Int.Cl. ⁶ Identification code FI H04B 7/26 D

Claims (6)

[Claims] 1. A first antenna provided near a receiver, a second antenna provided near a microphone, determining means for determining whether or not a call is being made, and When it is determined that the signal is not transmitted, a reception signal is generated based on the signal from the first antenna, and when it is determined that the telephone call is not being performed, a reception signal is generated based on the signal from the second antenna. A mobile phone comprising: 2. A foldable mobile phone having an upper housing provided with a receiver and a lower housing provided with a microphone, wherein the first antenna is provided on the upper housing, and the lower housing is provided with a lower antenna. A second antenna provided on the first and second antennas; a determination means for determining whether or not a call is in progress; and a receiving means for receiving a call based on a signal from the first antenna when the determination means determines that a call is in progress. A wireless unit that generates a signal and generates a received signal based on a signal from the second antenna when it is determined that a call is not being performed. 3. A foldable mobile phone having an upper housing provided with a receiver and a lower housing provided with a microphone, wherein a first antenna provided on the upper housing, and the lower housing. A second antenna, a switch for switching between passing a signal from the first antenna and a signal from the second antenna, and generating a reception signal based on a signal from the switch. Determining means for determining whether or not a call is in progress with a wireless unit to perform, and supplying a signal from the first antenna to the wireless unit when the determination means determines that a call is in progress. Control means for switching a changeover switch, and for changing over the changeover switch so as to supply a signal from the second antenna to the radio section when it is determined that a call is not in progress;
And a mobile phone provided with. 4. The portable telephone according to claim 1, wherein the first antenna and the second antenna are reception-only antennas. 5. The mobile phone according to claim 1, wherein said determination means determines that a call is in progress during a period from when the line is connected to when the line is disconnected. 6. A switch which is closed when the upper housing and the lower housing are closed, and is opened when the upper housing and the lower housing are open, The mobile phone according to any one of claims 2 to 4, wherein it is determined that a call is in progress while the switch is open.