JPH06112877A - Portable radio telephone set - Google Patents

Abstract

PURPOSE:To obtain a portable radio telephone set in which fluctuation of a transmission output level is suppressed for stable communication when an exter nal antenna is selected from a main body antenna. CONSTITUTION:A control voltage reference value required for output control and different from the use of an on-vehicle antenna 101 and the use of a main body antenna 102 is stored in an APC control circuit 160. In the talking mode, the APC control circuit 160 uses an external antenna connection detection circuit 115 to give a relevant control reference voltage to the APC circuit 150 via a D/A converter 114 depending whether the changeover to the on-vehicle antenna 101 is selected or the main body antenna 102 is selected respectively and even when the on-vehicle antenna 101 is used, the transmission output level of the amplifier 104 is controlled so as to obtain the same output when the main body antenna 102 is used.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a portable radiotelephone device which can be operated by switching a main body antenna and an external antenna.

[0002]

2. Description of the Related Art As is well known, a portable radio telephone device is provided with an antenna of a main body of the device (hereinafter referred to as a main body antenna) and an external antenna connection terminal, and is used as a portable device using the main body antenna. In addition to being able to operate, there is one that can be used as an in-vehicle device by connecting to the in-vehicle antenna of an automobile through the external antenna connection terminal. When this type of portable radio telephone device is used in an automobile, it is preferable to connect it to an in-vehicle antenna of the automobile because radio waves are less likely to be transmitted due to the shielding effect of the roof of the automobile.

FIG. 7 is a diagram showing a main configuration of a general portable radio telephone device of this type. Referring to FIG. 1, this portable radio telephone device 1 includes an automatic output control (APC) circuit 2 including an output controllable amplifier 21, an output detection circuit 22, and a comparator 23, a D / A converter 3, APC
The control circuit 4, the antenna changeover switch 5, and the main body antenna 6 are provided and configured.

The portable radiotelephone device 1 can be operated as an ordinary portable device using the main body antenna 6 by switching the antenna changeover switch 5 to the solid line side in the figure. In addition, the portable radio telephone device 1 can also be used as an in-vehicle device by connecting to the in-vehicle antenna 7 of the automobile through the in-vehicle adapter 8 and controlling the switching of the antenna changeover switch 5 to the dotted line side in the figure. FIG. 8 shows the control operation of the transmission output of the conventional portable radio telephone device 1.
This will be described with reference to the flowchart shown in FIG. This flowchart shows the operation of the APC control circuit 4 which controls the control voltage of the APC circuit 2 by software.

That is, when the APC control circuit 4 confirms that the portable radiotelephone device 1 has shifted to the call mode control (step 201), PL (power level) data preset according to the desired transmission output. Is read (step 202) and transmitted to the D / A converter 3 (step 203). The D / A converter 3 converts this PL data into an analog signal (control voltage) and sends it to the comparator 23. Then, the comparator 23 uses the D / A converter 3
The transmission output of the amplifier 21 is controlled based on the control voltage given by At this time, in the output detection circuit 22, the amplifier 2
The output of 1 is detected, and the detection result is fed back to the comparator 23. The comparator 23 compares the feedback voltage with the control voltage from the D / A converter 3, changes the control voltage so as to eliminate the difference, and controls the output of the amplifier 21 to be constant.

The amplifier 2 in the portable radio telephone 1
As the output characteristic of 1, the transmission level 27.8 dBm is output from the amplifier 21 when the control voltage supplied from the APC circuit 2 is 4.0 V (see FIG. 5).

Now, considering the situation where the main body antenna 6 is used as a portable device, the output of the amplifier 21 is transmitted without any loss when the antenna gain of the main body antenna 6 is set to 0 dB (see FIG. 7). From 27.8 dBm
Will be obtained.

In this portable radio telephone device 1, one PL
In order to control the output of the amplifier 21 based on the data, the output of the amplifier 21 is 27.8d even when it is connected to the vehicle-mounted antenna 7 via the vehicle-mounted adapter 8 and used as a vehicle-mounted device.
Same as Bm.

However, in this case, the vehicle-mounted antenna 7
Cable loss up to, for example, -4 dB (see FIG. 7)
Exists. Therefore, when used as an in-vehicle device, even if the gain of the in-vehicle antenna 7 is +2.5 dB, the cable loss from the transmission level 27.8 dBm of the amplifier 21 to the in-vehicle antenna 7 is -4 dB from this in-vehicle antenna 7. 26.3 dBm after subtracting the loss of -1.5 dB which is the sum of the antenna gain and +2.5 dB
Only the transmission output of can be obtained.

In this way, the conventional portable radio telephone device 1
Is controlled at the same transmission output level when it is connected to the vehicle-mounted antenna 7 through the vehicle-mounted adapter 8 and used as a vehicle-mounted device, and when it is used as a portable device by using the attached body antenna 6. The transmission output level output from the vehicle-mounted antenna 7 during use fluctuates with respect to the transmission output level output from the main body antenna 6 during mobile use due to output loss due to the cable used to connect to the vehicle-mounted antenna 7. There was a problem that it did.

[0011]

As described above, in the conventional radio telephone apparatus, the transmission output is always controlled to a constant value without recognizing which of the main body antenna and the external antenna is used. There is a problem that the transmission output at the time of connection largely changes with respect to the transmission output when the antenna of the main body is used due to the cable loss to the external antenna.

The present invention eliminates this problem and can obtain the same transmission output as when the main body antenna is used even when an external antenna is used, and it is stable both when it is used for mobile use and when it is used for vehicle use. An object of the present invention is to provide a portable wireless telephone device that can realize a call.

[0013]

According to the present invention, an amplifying means for amplifying a transmission signal, a switching means connected to an output portion of the amplifying means, and a main body antenna connected to one switching path of the switching means. And external antenna connection means connected to the other switching path of the switching means and capable of connecting an external antenna to the other end, and detecting whether the switching means is switched to the main body antenna side or the external antenna side. It is characterized by comprising an antenna connection detection means and a control means for variably controlling the output power of the amplification means according to the detection output of the antenna connection detection means.

[0014]

In the portable radio telephone device of the present invention, when the connection switching from the main body antenna to the external antenna is performed, the output of the amplifier is variably controlled so as to correct the loss of the transmission output level due to the cable to the external antenna. To do. Therefore, even when the external antenna is used, the same transmission output level as when the main body antenna is used can be obtained, which contributes to a stable call.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a portable radio telephone device according to the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 shows a portable radio telephone device 100 of the present invention.
1 shows an embodiment of the present invention, and particularly shows a block diagram of an automobile telephone device configured by applying the portable radio telephone device 100. First, before explaining the circuit diagram of FIG. 1, an outline of the car telephone device will be described with reference to FIGS.

The car telephone system 100 of this embodiment is shown in FIG.
As shown in FIG.
00, the in-vehicle adapter 200 is an automobile 40
It is installed near the front seat of 0 and the power supply is the power cord 3.
It is supplied from the vehicle-mounted battery 300 via 01. The in-vehicle adapter 200 is mounted on the rear part of the automobile 400 by the antenna cable 105.
01 is connected.

As shown in FIG. 3A, the portable radio telephone device 100 has a keypad 124a and a liquid crystal display portion 124b.
A display / operation unit 124 composed of is formed on one surface thereof, and the main body antenna 102 of the mobile wireless telephone device 100 is provided on the upper surface thereof.
Is provided.

This portable radio telephone device 100 is shown in FIG.
As shown in (b), it is connected to the in-vehicle adapter 200 via the adapter cord 107. Adapter code 107
Is configured to be detachable from the mobile wireless telephone device 100,
This portable radio telephone device 100 communicates with a base station (not shown) via the vehicle-mounted adapter 200, the antenna cable 105, and the vehicle-mounted antenna 101 in a state where the adapter cord 107 is connected, and in a state in which the adapter cord 107 is removed. Communicates with a base station (not shown) using the main body antenna 102 of the portable radio telephone device 100.

Next, with reference to FIG. 1, a circuit configuration of the automobile telephone device of the present invention will be described. The car telephone device of this embodiment includes a mobile radio telephone device 100, an in-vehicle adapter 200, an in-vehicle antenna 101, an antenna cable 105.
It is mainly composed of. The mobile wireless telephone device 100 includes
An antenna 102 is provided, and the antenna 102 is connected to the wireless unit 110.

The radio section 110 includes a capacitor C2 and a resistor R.
APC circuit 15 including an output detection circuit 116 including two, a comparator 103, an amplifier 104, and a duplexer 112.
0, an antenna changeover switch 106 for switching between the vehicle-mounted antenna 101 and the antenna 102, an external antenna connection detection circuit 115, a demodulator 109, and a modulator 113.
And a synthesizer 108 for selecting a channel, and D
/ A converter 114 and control unit 11 for controlling these
1 and 1. The control unit 111 uses the APC
It includes a control circuit 160.

Further, the portable radio telephone device 100 includes a display / operation unit 1 including a keypad 124a and a display unit 124b.
24 and the registration number (ID
Number) and a telephone number, and an ID-ROM 121,
A microphone 141 and a receiver 143 for inputting and outputting a voice signal, an input amplifier 140 and an output amplifier 142 for amplifying a voice signal, a rechargeable battery unit 133 which is a power source of the portable radio telephone device 100, a charger 134, a power source changeover switch 131, and The power supply control unit 130, a control unit 122 that performs overall control of these, a control / audio unit 120 including an audio unit 123, and the voltage detection unit 1
And 32.

On the other hand, the in-vehicle adapter 200 has the power control unit 2
01, one of which is connected to the vehicle-mounted battery 300 through the power cord 301, and the other of which is connected to the vehicle-mounted battery 300 by the adapter cord 107.
31 and the voltage detection unit 132, and also connected to the rechargeable battery unit 133 via the charger 134. One of the signal lines is connected to the antenna changeover switch 106 by the adapter cord 107, and the other is connected to the vehicle-mounted antenna 101 via the antenna cable 105. Next, the operation of this embodiment will be described with reference to FIG.

First, the operation of the portable radio telephone device 100 with the adapter cord 107 removed will be described. In this case, the antenna changeover switch 106 is turned on to the antenna 102 side of the mobile wireless telephone device 100,
Transmission and reception are performed by the antenna 102, the power source changeover switch 131 is turned on to the charging battery unit 133 side, and power is supplied from the charging battery unit 133.

To explain the case of reception, the reception signal received by the antenna 102 of the portable radio telephone device 100 is transmitted to the demodulator 109 via the antenna changeover switch 106 and the capacitor C2 and the duplexer 112. The received signal is demodulated by the demodulator 109, transmitted to the control / audio unit 120, converted into an analog audio signal by the audio unit 123, amplified by the output amplifier 142, and output from the receiver 143.

Next, the case of transmission will be described.
The audio signal input from the microphone 141 is amplified by the input amplifier 140, then sent to the audio section 123, and further sent from the audio section 123 to the modulator 113. Here, the audio signal is modulated by the modulator 113 under the channel selected by the synthesizer 108, and the modulated signal is further processed by the APC.
It is transmitted from the antenna 102 of the mobile wireless telephone device 100 via the circuit 150.

In this transmission operation, the APC circuit 150
Amplifies the input signal from the modulator 113 by the amplifier 104 and transmits it to the antenna 102 via the duplexer 112, the capacitor C2, the antenna changeover switch 106, and the conductor 105a. The output level of the amplifier 104 at this time is detected as a DC voltage by the output detection circuit 116 including the capacitor C2 and the resistor R2, and is fed back to the comparator 103. On the other hand, the reference signal that determines the output level of the amplifier 104 is sent from the APC control circuit 160 to the D / A converter 11
4 is input to the comparator 103, and in the comparator 103, the output voltage of the output detection circuit 116 and the D / A
The comparison with the reference signal level input from the converter 114 is performed. As a result of this comparison, when the output voltage of the output detection circuit 116 is not the same as the reference signal level, the transmission output level of the amplifier 104 is controlled so that the output voltage of the output detection circuit 116 becomes the same as the reference signal level. ,
Appropriate APC control is performed. Next, adapter code 1
The operation when the mobile telephone 07 is connected to the portable radio telephone 100 to form a car telephone as shown in FIG. 1 will be described.

First, when the portable radio telephone device 100 and the adapter cord 107 of the in-vehicle adapter 200 are connected, the voltage detection unit 132 detects the voltage from the in-vehicle battery 300, and the antenna changeover switch 106 moves from the antenna 102 side to the in-vehicle antenna 101 side. And the power supply switch 131 is switched from the rechargeable battery unit 133 side to the on-vehicle battery 300 controlled by the on-vehicle power supply control unit 201 provided in the on-vehicle adapter 200 to receive power supply and a charger. Rechargeable battery unit 1 via 134
Charging to 33 is started. The transmission / reception operation in this car telephone device is performed in the same manner as the above-described portable operation except that the in-vehicle antenna 101 is used instead of the antenna 102. Next, the output control in the APC circuit 150 of the portable radio telephone device 100 according to this embodiment will be described in detail.

As described in the section of the prior art, in this type of portable radio telephone device 100, the output of the amplifier 104 is controlled by the APC circuit 150 so that the proper transmission output can be obtained from the main body antenna 102. .

In the conventional output control in the APC circuit 150, one PL data is stored in the APC control circuit 160 corresponding to a desired transmission output, and this one PL data is used as a reference. The value was used for output control.

As described above, in the conventional output control method using one data as a reference value, particularly when the vehicle-mounted antenna 101 is used, there is a loss in the cable connecting the body apparatus 100 and the vehicle-mounted antenna 101, so that the body antenna is used. The antenna output when the in-vehicle antenna 5 is connected and operated changes with respect to the antenna output when the 102 is connected and operated.

Therefore, the portable radio telephone device 100 of the present invention is
Prepares two kinds of PL data for one desired transmission output in the APC control circuit 160, and the external antenna connection detection circuit 115 causes the antenna changeover switch 106 to change the PL data from the in-vehicle antenna 101 of the automobile 400. It is characterized in that it is automatically switched depending on whether or not the switching connection to the side is detected.

In the following description, the main body antenna 102
The PL data corresponding to the control voltage reference value with which the desired transmission output can be obtained from the main body antenna 102 when using is referred to as PL data 2.

Further, when the on-vehicle antenna 101 is used, a PL corresponding to a control voltage reference value that can obtain the desired transmission output (the same antenna output as when the main body antenna 102 is used) from the on-vehicle antenna 101. The data is called PL data 1.

Here, it is desirable that the transmission output from the external antenna 101 when using the PL data 1 and the transmission output from the main body antenna 101 when using the PL data 2 be kept the same. is there. In order to meet such a requirement, concrete data values of PL data 1 and PL data 2 are taken into consideration in consideration of the cable loss of the antenna cable 105 connecting the main body device 100 and the vehicle-mounted antenna 101 and the antenna gain of the vehicle-mounted antenna 101. Need to decide. With regard to an example of the PL data 1 and the PL data 2, a method of determining specific numerical values will be described with reference to FIGS. 1 and 5.

Now, the desired antenna output required for the device 100 of this embodiment to communicate with the base station is 27.8.
dBm. As shown in FIG. 1, if the output loss in the apparatus 100 of this embodiment and the antenna gain of the main body antenna 102 are both 0 dB, the output of the amplifier 104 is 27.8 dBm in order to obtain the antenna output when the main body antenna 102 is used. Will be good. Next, referring to FIG. 5, it can be seen that the control voltage reference value of 4.0 V is sufficient to obtain the output of 27.8 dBm from the amplifier 104. Therefore, the PL data 1 required for controlling the transmission output when the main body antenna 102 is used is the control voltage reference value 4.0.
APC control circuit 16 as digital data corresponding to V
It should be stored in 0.

Next, consider the case where the vehicle-mounted antenna 101 is used. In the embodiment shown in FIG. 1, the vehicle-mounted antenna 1
Adapter cable 1 for connecting 01 and main device 100
Cable loss of 07 and vehicle adapter 200 is -4 dB
When the antenna gain of the vehicle-mounted antenna 101 is +2.5 dB as shown in FIG.
There will be a loss of 1.5 dB. Therefore, even in such a situation, the output of the antenna (vehicle-mounted antenna 101) is reduced to 27.
In order to maintain 8 dBm, the transmission output of the amplifier 104 should be 2
It is required to be 9.3 dBm. Next, referring to FIG. 5, 29.3 dBm has a control voltage reference value of 4.2.
It is clear that V can be obtained. Therefore, the PL data 2 required for controlling the transmission output when the on-vehicle antenna 101 is used may be stored in the APC control circuit 160 as digital data corresponding to the control voltage reference value 4.2V.

Next, the PL data 1 set as described above
An example of the output control operation of the APC control circuit 160 using the PL data 2 will be described with reference to the flowchart of FIG.

When the transition to the call mode control is made (step 101), the APC control circuit 160 takes in the detection output of the external antenna connection detection circuit 115, and the main unit 1
It is determined whether the in-vehicle antenna 101 is connected to 00 (step 102). In-vehicle antenna 101
If it is informed that is not connected (the main body antenna 102 is in use) (step 102 NO), AP
The C control circuit 160 reads the PL data 2 (step 104) and sends it to the D / A converter 114 (step 105). If it is reported that the vehicle-mounted antenna 101 is connected (step 102YE
S), the APC control circuit 160 reads PL data 1 (step 103) and sends it to the D / A converter 114 (step 105). D / A converter 114 is A
PL data 1 or P supplied from the PC control circuit 160
The L data 2 is converted into an analog signal and input to the comparator 103. The comparator 103 compares the input signal from the D / A converter 114 with the output voltage of the output detection circuit 116, and as a result of the comparison, controls the transmission output of the amplifier 104 so as to compensate for the insufficient output. To do.

As described above, according to the present invention, the APC control circuit 160 stores control voltage reference values of different values required for output control when the vehicle-mounted antenna 101 is used and when the main body antenna 102 is used. Since the output control of the amplifier 104 is performed while the reference value is selected according to the type of antenna to be used, the vehicle-mounted antenna 101
It is possible to control the transmission output level of the amplifier 104 so that the same output as when the main body antenna 102 is used can be obtained even when is used, and as a result, a stable transmission output can always be obtained.

By the way, in the above embodiment, only one transmission output is set as a target, and when the on-vehicle antenna 101 and the main body antenna 102 are used, the transmission is always performed when the same target transmission output is obtained. This is a description of output control.

However, in the actual operation of this type of portable radio telephone device 100, the desired transmission output is not always constant. For example, in a mobile communication system using this type of portable radio telephone device 100,
When the reception level on the base station side fluctuates due to a change in the environment during communication, a power level instruction signal for instructing the portable radio telephone device 100 on the transmission side to increase or decrease the transmission output from the base station. Then, the portable wireless telephone device 100 side generates the transmission output requested by the base station side by varying the control voltage reference value given from the APC control circuit 160 to the comparator 103 in accordance with the received power level instruction signal. There are some that perform such control.

In such a system, in the transmission output control in the portable radio telephone device 100 on the transmission side in accordance with the request from the base station side, the in-vehicle antenna 101 is used every time the requested transmission output changes and the main body. Antenna 10
If the transmission output fluctuates between when 2 is used, this type of control has no meaning.

In order to eliminate such inconvenience, the amplifier 104 is used by using the PL data 1 and PL data 2 as described in the above embodiment for each transmission output requested from the base station side.
It is necessary to control the output of.

FIG. 6 shows the APC for implementing this control.
6 shows an example of a control data table prepared in the control circuit 160. In FIG. 6, the vehicle-mounted antenna 1
The PL data 1 required for transmission output control when 01 is used is the power level instruction signal (P0 to P) sent from the base station.
A plurality (PL10 to PL17) is prepared corresponding to each of 7). Similarly, the PL data 2 required for controlling the transmission output when the main body antenna 102 is used, one for each power level instruction signal sent from the base station (PL20 to PL20).
PL27) is prepared.

In the APC control circuit 160 having this data table, when a certain power level instruction signal is received from the base station, it corresponds to the power level instruction signal depending on whether the vehicle-mounted antenna 101 or the main body antenna 102 is used. By controlling the output of the amplifier 104 using either PL data 1 or PL data 2 described above, regardless of whether the vehicle-mounted antenna 101 or the main body antenna 102 is used at that time,
It is possible to generate a transmission output as requested from the base station side, which contributes to stable reception on the base station side.

[0047]

As described above, according to the present invention, when the connection switching from the main body antenna to the external antenna is performed, the loss of the transmission output level due to the cable to the external antenna is corrected by the amplifier. Since the output is variably controlled, when using a mobile wireless phone with an in-vehicle antenna of a car, it is possible to automatically correct the transmission level so that the transmission level does not change due to the cable loss to this in-vehicle antenna. The effect that it is possible to make a stable call just as time passes.

[Brief description of drawings]

FIG. 1 is a block diagram showing the configuration of an automobile telephone device to which a portable wireless telephone device of the present invention is applied.

FIG. 2 is a conceptual diagram for explaining a method of using the automobile telephone device according to the present invention.

FIG. 3 is an external perspective view for explaining a method of using the mobile wireless telephone device of the present invention.

FIG. 4 is a flowchart showing an operation of the mobile wireless telephone device according to the embodiment of the present invention.

FIG. 5 is a diagram showing the output characteristics of an output amplifier in this type of portable wireless telephone device.

FIG. 6 is a diagram showing an example of output control data stored in an APC control circuit of the portable wireless telephone device of the present invention.

FIG. 7 is a block diagram showing a configuration of a conventional portable wireless telephone device.

FIG. 8 is a flowchart showing the operation of a conventional portable wireless telephone device.

[Explanation of symbols]

 1, 100 Portable radio telephone device 2, 150 Automatic output control (APC) circuit 3, 114 D / A converter 4, 160 APC control circuit 5, 106 Antenna changeover switch 6, 102 Main body antenna 7, 101 In-vehicle antenna 8, 200 In-vehicle Adapter 21, 104 Output controllable amplifier 22, 116 Output detection circuit 23, 103 Comparator 105a Antenna cable 107 Adapter code 108 Synthesizer 109 Demodulator 110 Radio section 111 RF control section 112 Duplexer 113 Modulator 115 External antenna connection detection circuit C2 capacitor R2 resistor

Claims (1)

[Claims] 1. An amplifying means for amplifying a transmission signal, a switching means connected to an output part of the amplifying means, a main body antenna connected to one switching path of the switching means, and the other of the switching means. External antenna connecting means connected to the switching path and capable of connecting an external antenna to the other end; antenna connection detecting means for detecting whether the switching means is switched to the main body antenna side or to the external antenna side; A portable wireless telephone device comprising: a control unit that variably controls the output power of the amplification unit according to the detection output of the connection detection unit.