GB2260066A - Portable radio terminal equipment and vehicle-carried radio terminal equipment - Google Patents

Abstract

A portable radio terminal equipment (100) and a vehicle-carried radio terminal equipment employing the same eliminate an expensive coaxial curled cable and/or operating circuit to achieve reduction of the cost, weight and installation location. The portable radio terminal equipment (100) includes a switching circuit (50) for switching a transmission speech signal (c) and a reception speech signal (d), which are to be inputted to and outputted from an operating circuit (40), either to a control circuit (30) or an external interface terminal (60). A vehicular adapter, Fig. 2, (not shown), to be combined with the portable radio terminal equipment (100) comprises a vehicular antenna, a radio transmitter/receiver circuit and a control circuit similar to those of the portable radio terminal equipment (100). When the portable radio terminal equipment (100) is carried on a vehicle, the vehicular adapter is operated by way of the operating circuit (40) and ID information is supplied from the control circuit (30). <IMAGE>

Description

Portable Radio Terminal Equipment and Vehicle Carried Radio Terminal Equipment BACKGROUND OF THE INVENTION 1. Field of the Invention This invention relates to a portable radio terminal equipment for use as a movable unit of a mobile communication system such as an automobile radiotelephone system and a vehicle-carried radio terminal equipment for the same application including the portable radio terminal equipment.

2. Description of the Related Art Conventionally, in an automobile radiotelephone system wherein the main transmission line is a wireless circuit or a portable telephone system wherein the main transmission line is a wire circuit, a portable radio terminal equipment is required as a movable unit. In the systems, when a movable unit is used on a vehicle, the portable radio terminal equipment is connected to a vehicular adapter provided on the vehicle, and a radio frequency signal is transmitted between a vehicular antenna and a remote station of communications.

An exemplary one of conventional portable radio terminal equipments is shown in FIG. 3. The portable radio terminal equipment shown is constructed as a movable unit of an automobile radiotelephone system.

Referring to FIG. 3, a portable radio terminal equipment generally denoted at 100A includes an antenna 10 which, on one hand, converts a transmission signal a into a radio frequency signal and sends it out to a base station of the automobile radiotelephone system and, on the other hand, converts a radio frequency signal radiated from the base station into a reception signal b. A radio transmitter/receiver circuit 20A produces a transmission signal a under the control of a control circuit 30 and processes a reception signal b. The control circuit 30 controls calling connection (calling originating connection and calling receiving connection), communications and so forth with the base station.An operating circuit 40 has input/output interface means with a user of the portable radio terminal equipment lOOA and is connected to the control circuit 30 so that controlling signals involved in calling processing and communications control are inputted to and outputted from the control circuit 30.

An external interface terminal unit 60A is disposed on a housing of the portable radio terminal equipment 100A and serves as an external interface for the radio transmitter/receiver circuit 20A, control circuit 30 and operating circuit 40, that is, an interface for a vehicular adapter or the like which is connected thereto when the portable radio terminal equipment 100A is carried on a vehicle. The portable radio terminal equipment 100A normally includes, in addition to the elements, a battery package not shown and so forth.

The radio transmitter/receiver circuit 20A includes a duplexer 21, a transmitter circuit 22, a synthesizer circuit 23, a receiver circuit 24 and an antenna switch 25. The antenna switch 25 is connected at an end thereof to the duplexer 21 and connected, at one of two terminals thereof to be switched, to the antenna 10 and, at the other terminal thereof, to a coaxial terminal 64 of the external interface terminal unit 60A. The antenna switch 25 is connected, when the portable radio terminal equipment l00A is used by itself, to the antenna 25, but is connected, when the portable radio terminal equipment 100A is carried on a vehicle, to a vehicular adapter (not shown) by way of the interface terminal unit 60A and further connected to a vehicular antenna (not shown).The transmitter circuit 22 produces a transmission signal a from a transmission speech signal c and a controlling signal e both received from the control circuit 30. The receiver circuit 24 processes a reception signal b to produce a reception speech signal d and a controlling signal f both to be outputted to the control circuit 30. The synthesizer circuit 23 outputs a local oscillation signal g for the transmitter circuit 22 and the receiver circuit 24. The duplexer 21 distributes and synthesizes a transmission signal a and a reception signal b having different frequency components from each other.A synthesizing terminal of the duplexer 21 is connected to an end of the antenna switch 25 so that a transmission signal a produced by the transmitter circuit 22 is converted into a radio frequency signal and sent out to the base station by the antenna 10 or the vehicular antenna by way of the duplexer 21. On the contrary, a reception signal b from the antenna 10 or the vehicular antenna is inputted to the receiver circuit 24 by way of the duplexer 21. The transmitter circuit 22, receiver circuit 24 and synthesizer circuit 23 perform selection of a particular frequency channel and/or a switching on/off operation of a transmission carrier in response to a controlling signal e inputted thereto from the control circuit 30.

The control circuit 30 includes a logic control circuit for controlling the radio transmitter/receiver circuit 20A to effect calling connection, communications and so forth and further includes a microprocessor (CPU), a ROM, a RAM, an EEPROM, an encoder/decoder for serial data (controlling signals e and f) to be communicated with the radio transmitter/receiver circuit 20A in order to effect calling connection with the base station, and so forth. The EEPROM stores therein ID information including an ESN (electric serial number), a telephone number allotted to each of such portable radio terminal equipments 100A and so forth as well as a plurality of kinds of parameters necessary for calling connection, and those data are read out from and written into the EEPROM by the logic control circuit.Further, a transmission signal c is received from the operating circuit 40 and sent out to the radio transmitter/receiver circuit 20A, and a reception speech signal d is received from the radio transmitter/receiver circuit 20A and sent out to the operating circuit 40.

The operating circuit 40 includes a microphone 41 for outputting a transmission speech signal c and a loudspeaker 42 for receiving a reception speech signal d, and the microphone 41 and the loudspeaker 42 are used when the portable radio terminal equipment 100A is used by itself. The operating circuit 40 further includes a key operating circuit by way of which a user of the portable radio terminal equipment 100A enters a controlling input signal, an LCD display section for displaying thereon various messages such as a remote station calling telephone number entered by way of the key operating circuit, a speaking time, a remaining capacity of a battery and so forth under the control of the control circuit 30.

The terminal 64 of the external interface terminal unit 60A is connected to the antenna switch 25 of the radio transmitter/receiver circuit 20A and serves as an input/output terminal for a transmission signal a and a reception signal b each in the form of a high frequency signal. Terminals 65 include input/output terminals for all cpntrolling signals and audio signals (transmission speech signal c and reception speech signal d) communicated between the control circuit 30 and operating circuit 40 and an optzbnal appliance which is connected to the external interface terminal unit 60A.

FIG. 4 shows a vehicle-carried radio terminal equipment wherein the portable radio terminal equipment 100A described above is carried on a vehicle and is used in combination with a vehicular adapter 300 carried on the vehicle. The vehicle-carried radio terminal equipment is disclosed in Japanese Patent Laid-Open Application No. 3-76430 (European Patent Application EP-A-O 413 355).

A microphone 302 and a loudspeaker 303 to be used in place of the microphone 41 and the loudspeaker 42 of the portable radio terminal equipment l00A are connected to the vehicular adapter 300 so that, when the portable radio terminal equipment 100A is carried on the vehicle, a user may use the vehicle-carried radio terminal equipment in a hand-free condition. Further, though not shown, the vehicular adapter 300 includes a power source voltage converting section for converting a power source from the vehicle into a power source voltage for the portable radio terminal equipment l00A.

The external interface terminal unit 60A of the portable radio terminal equipment l00A and a connector 301 provided on a housing of the vehicular adapter 300 are interconnected by a coaxial curled cable 310 including a coaxial conductor for transmitting a high frequency signal therethrough. The coaxial curled cable 310 transmits a transmission signal a, a reception signal b, an audio signal and a plurality of controlling signals therethrough.

When the vehicle-carried radio terminal equipment of FIG. 4 is used, the vehicular adapter 300 sends out a vehicle-carried/personally-carried mode identification signal to the portable radio terminal equipment 100A. Consequently, the switch terminal of the antenna switch 25 is switched to the external interface terminal unit 60A side. Then, a transmission signal a from the portable radio terminal equipment lOOA is introduced by way of the coaxial curled cable 310 and the vehicular adapter 300 to and amplified by a booster 320 serving as an option appliance, and then it is sent out as a radio frequency signal from the vehicular antenna 330 provided on the vehicle to a remote station of communications.A reception signal b from the vehicular antenna 330 is inputted to the vehicular adapter 300 without being influenced by the booster 320 and then inputted to the radio transmitter/receiver circuit 20A of the portable radio terminal equipment 100A by way of the coaxial curled cable 310. On the other hand, when a hand-free operation is to be performed, a transmission speech signal c is inputted from the microphone 302 to the control circuit 30, and a reception speech signal d is inputted from the control circuit 30 to the loudspeaker 303. In this instance, the microphone 41 and the loudspeaker 42 of the operating circuit 40 are kept in an off-state.

FIG. 5 shows another conventional vehiclecarried radio terminal equipment. Referring to FIG. 5, a vehicular adapter 200A has a radio transmitter/receiver circuit 80 having a substantially similar function as the radio transmitter/receiver circuit 20A shown in FIG. 3, and a control circuit 90A having a substantially similar function as the control circuit 30. The vehicular adapter 200A further has a vehicular antenna 70 having the same function as the vehicular antenna 330 shown in FIG. 4. The vehicular adapter 200A has a substantially similar function as the portable radio terminal equipment 100A shown in FIG. 3 except that it does not include the operating circuit 40.Accordingly, the vehicular adapter 200A need not perform communication of a transmission signal a and a reception signal b each in the form of a high frequency signal with a portable radio terminal equipment 100B connected thereto. Consequently, the portable radio terminal equipment lOOB is provided with no antenna switch 25 and besides need not include a coaxial curled cable 310 for transmitting a high frequency signal therethrough. However, the vehicle-carried radio terminal equipment has an operating circuit 400 having a substantially similar function as the operating circuit of the portable radio terminal equipment 100B, that is, the operating circuit 40 of the portable radio terminal equipment 100A, and the operating circuit 400 serves as an operating circuit for the exclusive use for the vehicular adapter 200A.

When the vehicle-carried radio terminal equipment of FIG. 5 is to be used, the radio circuit of the portable radio terminal equipment 100B is switched off, and the radio transmitter/receiver circuit 80 of the vehicular adapter 200A is used. Further, in this instance, since the control circuit 90A of the vehicular adapter 200A is used, also the control circuit and the operating circuit of the portable radio terminal equipment lOOB are not basically rendered operative, but only ID information from the control circuit is transmitted to the vehicular adapter 200A.

The conventional portable radio terminal equipment described above is disadvantageous in that the production cost thereof is high and a vehicle-carried radio terminal equipment in which the portable radio terminal equipment is incorporated has a comparatively great overall weight because a curled cable with a coaxial conductor is necessary for transmitting a high frequency signal between the portable radio terminal equipment and a vehicular adapter.

The conventional portable radio terminal equipment is further disadvantageous in that, since an operating circuit must necessarily be provided for each of the portable radio terminal equipment and a vehicular adapter, a corresponding high cost is required, and the necessity of the two operating circuits results in difficulty in assuring mounting locations for them.

SUMMARY OF THE INVENTION In accordance with a first aspect of the present invention, there is provided a portable radio terminal equipment, which includes an antenna for. converting a radio frequency signal received from a remote station of communications into a reception signal and converting a transmission signal to be transmitted to the remote station of communications into a radio frequency signal, a radio transmitter/receiver circuit connected to the antenna and including a receiver circuit for receiving the reception signal, a transmitter circuit for producing the transmission signal, a synthesizer circuit for supplying a local oscillation signal to the receiver circuit and the transmitter circuit and a duplexer for separating and coupling the reception signal and the transmission signal, a control circuit for controlling calling processing and communications with the remote station of communications, the control circuit including means for receiving a reception speech signal formed from the reception signal by the radio transmitter/receiver circuit and means for receiving a transmission speech signal to be formed into the transmission signal, an operating circuit including input/output interface means from and to a user, means for sending out the transmission speech signal, means for receiving the reception speech signal and means for inputting and outputting a controlling signal involved in the calling processing and communications control to and from the control circuit, and external interface terminal means provided on a housing of the portable radio terminal equipment, characterized in that it further comprises first switching means for selectively sending out the transmission speech signal sent out from the operating circuit to the control circuit or the external interface terminal means, and second switching means for switching the reception speech signal to be received by the operating circuit to a reception speech signal from the control circuit or another reception speech signal from the external interface terminal means, the control circuit including means for rendering the radio transmitter/receiver circuit inoperative when the first and second switching means are switched to the external interface terminal means side, and means for sending out ID information to the external interface terminal means.

With the portable radio terminal equipment, since it comprises the first and second switching means for switching a transmission speech signal and a reception speech signal, which are to be inputted to and outputted from the operating circuit, either to the control circuit or the external interface terminal means, when it i-s incorporated in a vehicle-carried radio terminal equipment in combination with a vehicular adapter, there is no necessity of preparing an expensive coaxial curled cable or overlapping operating circuit.

Accordingly, the vehicle-carried radio terminal equipment can be produced at a reduced cost and reduced in overall weight and installation location.

According to another aspect of the present invention, there is provided a vehicle-carried radio terminal equipment, characterized in that it comprises a portable radio terminal equipment as defined above, and a vehicular adapter carried on a vehicle. The vehicular adapter includes a connector for being connected to the external interface terminal means of the portable radio terminal equipment, a vehicular antenna for converting a radio frequency signal received from a remote station of communications into a reception signal and converting a transmission signal to be transmitted to the remote station of communications into a radio frequency signal, a radio transmitter/receiver circuit connected to the vehicular antenna and including a receiver circuit for receiving the reception signal, a transmitter circuit for producing the transmission signal, a synthesizer circuit for supplying a local oscillation signal to the receiver circuit and the transmitter circuit and a duplexer for separating and coupling the reception signal and the transmission signal, and a control circuit for controlling calling processing and communications with the remote station of communications, the control circuit including means for receiving a reception speech signal formed from the reception signal by the radio transmitter/receiver circuit and means for receiving a transmission speech signal to be formed into the transmission signal. The control circuit of the vehicular adapter is operated by way of the operating circuit of the portable radio terminal equipment when the external interface terminal means of the portable radio terminal equipment is connected to the connector.

With the vehicle-carried radio terminal equipment, since the portable radio terminal equipment thereof the switching circuit for switching a transmission speech signal and a reception speech signal, which are to be inputted to and outputted from the operating circuit, either to the control circuit or the external interface terminal means, there is no necessity of preparing an expensive coaxial curled cable or overlapping operating circuit. Accordingly, the vehicle-carried radio terminal equipment can be produced at a reduced cost and reduced in overall weight and installation location.

The above and other objects, features and advantages of the present invention will become apparent from the following description and the appended claims, taken in conjunction with the accompanying drawings in which like parts or elements are denoted by like reference characters.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram of a portable radio terminal equipment to which the present invention is applied; FIG. 2 is a block diagram of a vehicle-carried radio terminal equipment to which the present invention is applied; FIG. 3 is a block diagram showing an exemplary one of conventional portable radio terminal equipments; FIG. 4 is a block diagram showing an exemplary one of conventional vehicle-carried radio terminal equipments; and FIG. 5 is a similar view but showing another exemplary one of conventional vehicle-carried radio terminal equipments.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring first to FIG. 1, there is shown a portable radio terminal equipment to which the present invention is applied. The portable radio terminal equipment shown is generally denoted at 100 and includes an antenna 10, a radio transmitter/receiver circuit 20, a control circuit 30, an operating circuit 40, a switching circuit 50 and an external interface terminal unit 60. Since the control circuit 30 and the operating circuit 40 individually have the same functions as those of the portable radio terminal equipment 100A shown in FIG. 3, overlapping description thereof is omitted herein to avoid redundancy. Further, the radio transmitter/receiver circuit 20 has the same configuration as the radio transmitter/receiver circuit 20A described above except that it does not include the antenna switch 25.The external interface terminal unit 60 has a terminal 61 for a transmission speech signal, another terminal 62 for a reception speech signal, and a further terminal 63 for a controlling signal.

The switching circuit 50 assumes, when the portable radio terminal equipment 100 is carried on a vehicle, a switching position wherein a transmission signal c, which is. to be sent out from the operating circuit 40 to the control circuit 30, is sent out to the external interface terminal unit 60 and a reception speech signal d, which is to be received by the operating circuit 40, is transmitted not from the control circuit 50 but from the external interface terminal unit 60. The switching section 50 includes, in the arrangement shown in FIG. 1, three switches S1, S2 and S3 which operate in an interlocking relationship with each other. When the portable radio terminal equipment 100 is carried on a vehicle, the switches S1 to S3 can be automatically and simultaneously switched ether manually or in response to a switching controlling signal inputted thereto from the controlling signal terminal 63 of the external interface terminal unit 60.

The transmission speech signal terminal 61 of the external interface terminal unit 60 is connected to the common terminal 513 of the switch Sl and to the terminal S32 of the switch S3; the reception speech signal terminal 62 is connected to the common terminal 523 of the switch S2; and the controlling signal terminal 63 is connected to a controlling signal line interconnecting the control circuit 30 and the operating circuit 40.

The three terminals including the transmission speech signal terminal 61 (which may operate bi-directionally), the reception speech signal terminal 62, and the controlling signal terminal 63 shown in Figure 1 are all shown collectively as the signal terminal 65 in Figure 3. Equally the single connection between circuits 30 and 40 in Figure 3 represent the three connections shown in Figure 1. The terminal 64 of Figure 3 is not shown in Figure 1, but may be included also.

When the portable radio terminal equipment 100 is used by itself (which may also be called as master mode), a transmission speech signal c from the operating circuit 40 is sent out to the control circuit 30 by way of the terminals S33 and S31 of the switch S3 and the adder 51, and a reception speech signal d from the control circuit 30 is sent out to the operating circuit 40 by way of the terminals S21 and 523 of the switch S2. On the other hand, when the portable radio terminal equipment 100 is carried on a vehicle, the switches S1 and 53 are switched off so that a transmission speech signal c from the operating circuit 40 is not inputted to the control circuit 30 but is sent out to the transmission speech signal terminal 60 by way of the terminals 533 and 532 of the switch S3.

Meanwhile, a reception speech signal d from the control circuit 30 is not sent out to the operating circuit 40 but another reception speech signal d from the reception speech signal terminal 62 of the external interface terminal unit 60 is sent out directly to the operating circuit 40 because the switch S2 has been switched from the terminal S21 to the terminal 522.

It will be appreciated that the switch S1 is provided to switch an external transmission speech signal on or off, while the switch S3 is provided to switch an internal transmission speech signal on or off, and the adder 51 is provided to add the two signals. Normally, in the vehicle-carried mode, the switch S1 is on and the switch S3 is off, but in the personally carried mode, the switch S1 is off and the switch S3 is on.

In this manner, the portable radio terminal equipment 100 when it is used by itself causes a transmission speech signal c and a reception speech signal d, which are to be inputted to and outputted from the operating circuit 40, to be inputted to and outputted from the control circuit 30, respectively. On the other hand, the portable radio terminal equipment 100 when it is carried on a vehicle causes a transmission speech signal c and a reception speech signal d to be inputted to and outputted from the external interface terminal unit 60, respectively.

Referring now to Fig. 2, there is shown a vehicle-carried radio terminal equipment to which the present invention is applied.

The vehicle-carried radio terminal equipment includes the portable radio terminal equipment 100 described with reference to FIG. 1, and a vehicular adapter 200 to which the portable radio terminal equipment 100 is connected.

The vehicular adapter 200 includes, similarly as in the vehicular adapter 200A described hereinabove with reference to FIG. 5, a vehicular antenna 70, a radio transmitter/receiver circuit 80 and a control circuit 90 which has a substantially same configuration as the control circuit 90A. When the portable radio terminal equipment 100 is carried on a vehicle, the vehicular antenna 70, the radio transmitter/receiver circuit 80 and the control circuit 90 included in the vehicular adapter 200 are rendered operative. However, operation of the vehicular adapter 200 is performed by way of the operating circuit 40 of the portable radio terminal equipment 100.

In a vehicle-carried condition of the portable radio terminal equipment 100 wherein it is carried and used on a vehicle (which may be called as a slave mode), when the external interface terminal unit 60 of the portable radio terminal equipment 100 is connected to a connector 201 of the vehicular adapter 200, the vehicular adapter 200 renders the radio transmitter/receiver circuit 80 and the control circuit 90 thereof operative and sends out a vehiclecarried/personally-carried mode identification signal to the portable radio terminal equipment 100 by way of the controlling signal terminal 63 of the external interface terminal unit 60.Consequently, the control circuit 30 of the portable radio terminal equipment 100 renders the operating circuit 40, the switching circuit 50 and the ID information sending out function of the control circuit 30 operative but does render the radio transmitter/receiver circuit 20 and any other function of the control circuit 30 other than the ID information sending out function operative.The switching circuit 50 thus switches, in response to the vehiclecarried/personally-carried mode identification signal or a manual operation, the route of a transmission speech signal c to the external interface terminal unit 60 so as to send out the transmission speech signal c from the operating circuit 40 to the vehicular adapter 200 and further switches the route of a reception speech signal d from the control circuit 30 to the external interface terminal unit 60 so as to send out the reception speech signal d from the vehicular adapter 200 to the operating circuit 40.

In the vehicle-carried condition described above, the vehicle-carried radio terminal equipment performs communications between the vehicular adapter 200 and the remote station of communications using the operating circuit 40, the switching circuit 50, the external interface terminal unit 60 and part of the control circuit 30 (ID information sending out function) of the portable radio terminal equipment 100. It is to be noted that a microphone 202 and a loudspeaker 203 are provided on the vehicular adapter 200 for allowing a hand-free operation of the vehicle-carried radio terminal equipment, and when they are to be used, the microphone 41 and the loudspeaker 42 of the operating circuit 40 are switched off. Further, it is naturally possible to directly couple the external interface terminal unit 60 and the connector 201 in a plug-in condition to each other to make up a unitary apparatus of the portable radio terminal equipment 100 and the vehicular adapter 200.

Having now fully described the invention, it will be apparent to one of ordinary skill in the art that many changes and modifications can be made thereto without departing from the scope of the invention as set forth herein.

Claims (4)

1. A portable radio terminal equipment which includes an antenna (10) for receiving a radio frequency signal received from a remote communications station as a reception signal (b) and for transmitting a transmission signal (a) to be transmitted to said remote communications station as a radio frequency signal, a radio transmitter/receiver circuit (20) connected to said antenna (10) and including a receiver circuit (24) for receiving the reception signal (b), a transmitter circuit (22) for producing the transmission signal (a), a synthesizer circuit (23) for supplying a local oscillation signal to said receiver circuit (24) and said transmitter circuit (22), and a duplexer (21) for separating and coupling the reception signal (b) and the transmission signal (a), a control circuit (30) for controlling calling processing and communications with said remote communications station, said control circuit (30) including means for receiving a reception speech signal (d) formed from the reception signal by said radio transmitter/receiver circuit (20) and means for receiving a transmission speech signal (c) to be formed into the transmissionn signal (a), an operating circuit (40) including input/output interface means (41,42) from and to a user, means for sending out the transmission speech signal (c), means for receiving the reception speech signal (d), and means for inputting and outputting a controlling signal involved in the calling processing and communications control to and from said control circuit (30), and external interface terminal means (60) provided on a housing of said portable radio terminal equipment (100), characterized by:: first switching means (S3) for selectively applying the transmission speech signal (30) from said operating circuit (40) either to said control circuit (30) or to said external interface terminal means (60), and second switching means (S2) for switching the reception speech signal (d) to be received by said operating circuit (40) either to a reception speech signal (d) from said control circuit (30) or to another reception speech signal (d) from said external interface terminal means (60), said control circuit (30) including means for rendering said radio transmitter/receiver circuit (20) inoperative when said first and second switching means (S3;S2) are switched to said external interface terminal means (60), and means for sending out ID information to said external interface terminal means (60).

2. A vehicle-carried radio terminal equipment, for use with a portable radio terminal equipment (100) as sent forth in claim 1, comprising a vehicular adapter (200) carried on a vehicle and including a connector (201) for connection to said external interface terminal means (60) of said portable radio terminal equipment (100), a vehicular antenna (70) for converting a radio frequency signal received from a remote communications station into a reception signal and converting a transmission signal to be transmitted to said remote communications station into a radio frequency signal, a radio transmitter/receiver circuit (80) connected to said vehicular antenna (70) and including a receiver circuit for receiving the reception signal, a transmitter circuit for producing the transmission signal, a synthesizer circuit for supplying a local oscillation signal to said receiver circuit and said transmitter circuit, and a duplexer for separating and coupling the reception signal and the transmission signal, and a control circuit (90) for controlling calling processing and communications with said remote communications station, said control circuit including means for receiving a reception speech signal formed from the reception signal by said radio transmitter/receiver circuit and means for receiving a transmission speech signal to be formed into the transmission signal, said control circuit (90) of said vehicular adapter (200) being operated by way of said operating circuit (40) of said portable radio terminal equipment (100) when said external interface terminal means (60) of said portable radio terminal equipment (100) is connected to said connector (201).

3. A portable radio terminal equipment substantially as herein described with reference to Figure 1 of the drawings.

4. A vehicle-carried radio terminal equipment substantially as herein described with reference to Figure 2 of the drawings.