JP2662099B2 - Wireless telephone equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radio telephone device in a multi-channel access (hereinafter referred to as "MCA") system in which a plurality of terminal stations provided with the same group code communicate via a central office, and in particular, The present invention relates to a wireless telephone device capable of communicating with a telephone housed in a public line (hereinafter, referred to as a public line telephone).

[0002]

2. Description of the Related Art FIG. 7 is a block diagram showing a conventional radio telephone apparatus of this kind. In the figure, reference numeral 1 denotes a control unit that performs overall control of the wireless telephone device, and reference numeral 2 denotes a storage unit that stores the device number of its own device, which is used by the control unit 1 for transmission / reception control.

[0003] Reference numeral 3 denotes a microphone to which an audio signal to be transmitted is input, and reference numeral 4 denotes a transmission unit for transmitting a radio wave obtained by modulating a carrier wave by the audio signal. Reference numeral 5 denotes a receiving unit that demodulates the received radio wave, and reference numeral 6 denotes a switch that turns on and off the reception signal demodulated by the receiving unit 5.

[0004] Reference numeral 7 denotes a tone generating unit for generating a signal tone for notifying a user of an incoming call or the like according to an instruction from the control unit 1.
Reference numeral 8 denotes an amplifier for amplifying the reception signal passing through the switch 6 and the signal sound transmitted from the tone generator 7. Reference numeral 9 denotes a speaker that outputs the output signal of the amplifier 8 as audio.

[0005] Reference numeral 10 denotes a press talk switch (hereinafter referred to as a PT switch) for instructing the control unit 1 to switch between transmission and reception. Reference numeral 11 denotes a display for displaying the state of the wireless telephone device and the like. Reference numeral 12 denotes an interface circuit for connecting the display 11 to the control unit 1.

FIG. 6 is a block diagram showing an outline of an MCA system using such a wireless telephone device. In the figure, reference numeral 21 denotes a plurality of mobile stations provided with the same group code, and reference numeral 22 denotes a communication center provided with the same group code as each of the mobile stations 21.

[0007] The radio telephone apparatus shown in FIG.
1 and the communication center 22 to perform group communication with each other. In the case where these mobile stations 21 and the communication center 22 are not particularly distinguished, the reference numeral 20 is used.
Are generally referred to as terminal stations. Numeral 30 denotes a central station for relaying and controlling the communication of the terminal station 20, and numeral 40 denotes this central station 3.
0 is a public line telephone housed via a public line.

Next, the operation will be described. Where MC
In the A system, a plurality of terminal stations 20 given the same group code can communicate with each other. In addition, each terminal station 20 has an individual device number set in advance, which is Is stored in the storage unit 2.

The control unit 1 sends a signal including this device number at the beginning or end of communication, so that a plurality of terminal stations 20
It implements a selective call function that enables communication only with the station, and displays the device number of the communication partner on the display 11.
When receiving this signal, the control unit 1 receives the tone generation unit 7.
Is transmitted to transmit a predetermined signal sound, and the user of the wireless telephone device is notified acoustically to that effect.

In such an MCA system, communication is possible between the public line telephone 40 and the wireless telephone device of each terminal station 20. In this case, first, the telephone number assigned to the terminal station 20 with which communication is desired from the public line telephone 40 is input and a call is made.

[0011] The central station 30 receives the call checks the idle traffic channel, if a call channel vacant, a specified channel that contains the group code corresponding to the telephone number (hereinafter, designated PSTN group ) Is transmitted to each terminal station 20 by radio, and the public telephone 40
And communication with the wireless telephone device of each terminal station 20 of the predetermined group.

The wireless telephone device of each terminal station 20 is a central office 3
The receiving unit 4 receives and demodulates the radio wave from 0 and sends the demodulated signal to the control unit 1. The control unit 1 decodes the demodulated signal, and the central station 30 issues a PSTN group with the same group code as that of the own station .
When a signal designating a loop is received, the interface circuit 12 is controlled to display the signal on the display 11.

FIG. 8 is an explanatory diagram showing a display example. During communication with public line telephone instead of terminal station as shown
"FFF" indicating that each terminal station in a predetermined group
The characters "simultaneous" indicating simultaneous communication with the public line telephone 40 and "area" indicating the area display of the central office 30
Character and communication channels are occupied and communication is possible
"Occupancy" is displayed.

Thereafter, the control unit 1 sets a communication channel in the transmission unit 4 and the reception unit 5 and further controls the switch 6 to send a demodulated signal from the reception unit 5 to the amplifier 8 and output sound from the speaker 9. . On the other hand, when the PT switch 10 is on, the audio signal from the microphone 3 is sent to the transmission unit 4 and transmitted on a radio wave.

[0015]

Since the conventional radio telephone apparatus is configured as described above, the public telephone 40
Calls the terminal station 20 from the public line telephone 40
The content of the communication can be received by the wireless telephone device of each terminal station 20 of the same group code, and there is a problem that communication cannot be performed without knowing the content by other people in the group.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a wireless telephone device capable of selectively communicating only one wireless telephone device to be communicated from a public line telephone and enabling communication. With the goal.

[0017]

A radio telephone apparatus according to the present invention includes a DTMF signal detector for detecting a selective calling signal based on a push-button dial signal (hereinafter referred to as a DTMF signal) from a demodulated signal from a receiver. , The control unit performs a match detection between the selective call signal detected by the DTMF signal detection unit and the device number stored in the storage unit,
A function is provided that enables communication only when a match is detected, and disables communication when the match is not detected.

[0018]

When the DTMF signal detecting section detects the selective calling signal, the control section of the present invention compares the selective calling signal with the apparatus number assigned to its own apparatus stored in the storage section, and the two coincide with each other. In this case, it is possible to select one of a plurality of terminal stations from a public line telephone and call the wireless telephone apparatus to perform communication by making communication possible only in the case where the communication is impossible and disabling communication in the case of a mismatch. Implement a telephone device.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, 2 is a storage unit, 3 is a microphone,
4 is a transmission unit, 5 is a reception unit, 6 is a switch, 7 is a tone generation unit, 8 is an amplifier, 9 is a speaker, 10 is a PT switch, 11 is a display, and 12 is an interface circuit.
7 are the same as or corresponding to those in the related art having the same reference numerals in FIG.

Reference numeral 13 denotes a DT for detecting a selective calling signal composed of a DTMF signal input in a combination of numbers from among the received signals received by the receiving unit 5 and demodulated.
MF signal detection unit.

A detection unit 14 detects a match between the selective calling signal detected by the DTMF signal detection unit 13 and a device number stored in the storage unit 2 and given to the wireless telephone device. Only when it is performed, an automatic response is performed to enable communication by the transmission unit 4 and the reception unit 5,
The control unit is different from the control unit denoted by reference numeral 1 in FIG. 7 in that it has a function of disabling communication in the case of a mismatch.

Next, the operation will be described. The operation from the public line telephone 40 to the calling of the wireless telephone device of the terminal station 20 until the communication is started is the same as in the conventional case, and the description is omitted.

When this communication starts, the public line telephone 40
Thus, the device number of the wireless telephone device of the terminal station 20 that wants to perform one-to-one communication is set. This device number setting method is, for example, when it is desired to communicate only with the device number: 001, the dial button “0”,
Each button of “0”, “1”, and “*” is pressed in order.
Thus, the DTMF signal corresponding to the pressed button is received by the wireless telephone device of each terminal station 20 via the central office 30.

FIG. 2 shows a DTMF in a wireless telephone device.
It is a flowchart which shows the detection method of a signal, and the procedure of control. First, when communication with the public line telephone 40 starts in response to a command from the central office 30, initialization is performed in step ST1. Here, the memory for storing the device number received by the DTMF signal is cleared.

Next, the control unit 14 checks the signal detection of the DTMF detection unit 13 in step ST2. When a signal is detected, it is determined in step ST whether the detection is continued for a predetermined time.
Check with 3. If the detection continues for a certain period of time, then step ST
At 4, the DTMF signal is checked for off (no received signal). Regarding the turning off of the DTMF signal, Step S
At T5, it is checked whether or not it has continued for a certain time.

If the turning-off also continues for a predetermined time, the control unit 14 determines that one DTMF signal has been received. This is DT
Since the MF signal is received on the wireless line, this is for countermeasures against fading, noise, and the like, and is also a countermeasure for chattering when the dial button of the public telephone 40 is pressed.

Upon determining that a DTMF signal has been received,
In step ST6, it is determined whether or not the signal is a "*" signal (selection call end signal). If the signal is not the "*" signal, the DTMF signal received in step ST7 is set in the cleared memory. Also,"*"
If it is a signal, the detection of the selective calling signal is completed by the DTMF signal.

When the detection of the selective call signal is completed, the selective call signal is compared with the device number of the wireless telephone device previously stored in the storage device 2 in step ST8. As a result, if they do not match, the process proceeds to step 9 to perform a process of disabling communication.

In the process of disabling communication, first, the interface circuit 12 is controlled to display "busy" characters together with "simultaneous" , "area" and "occupancy" on the display unit 11, as shown in FIG. Then, the user is notified that communication is impossible. At the same time, the switch 6 is turned off so that the received demodulated signal is not output from the speaker 9, and transmission is disabled even if a transmission request is received from the PT switch 10.

When the device number matches the selective calling signal, the display 11 is changed from "simultaneous" to "individual" as shown in FIG. The user of the telephone device is notified that communication with the public telephone 40 is possible one-to-one. At the same time, the tone generator 7 is controlled to notify the user of the fact by a signal tone.

In order to notify the user of the public line telephone 40 that the selection signal has been received, an automatic response is made using a voice band signal. For example, the control unit 14 transmits
Is automatically transmitted for one second by the 1800 Hz MSK signal used when the terminal station 20 requests the central station 30 for communication.

Thereafter, when the PT switch 10 is on,
The transmission unit 4 is controlled to transmit the sound from the microphone 3, and when the PT switch 10 is off, the reception state is set and the sound is output from the speaker 9 as a reception signal.

A series of processes after the detection of a match between the device number and the selected call number is executed in step ST10.

Further, the detection of the selective calling number by the DTMF signal ends the communication (on-hook by the public line telephone).
When a match with the device number is detected, the communication enabled state is set, and when a mismatch is detected,
Set to a state where communication is not possible. As a result, the terminal station 2 performing one-to-one communication during the communication from the public line telephone 40.
It is also possible to change 0.

In the above embodiment, transmission is performed when the PT switch 10 is turned on during communication. However, when the selective call signal is received, other terminal stations are in a state where transmission is not possible. Transmission and reception may be performed. FIG. 5 is a block diagram showing such an embodiment. When a selective call signal is received from the public line telephone 40, the PT switch 10 during communication becomes unnecessary, so that the PT switch is removed in FIG. I have. The other parts are the same as those of the embodiment shown in FIG. 1, and the same reference numerals are given and the description is omitted.

[0036]

As described above, according to the present invention, the detected selective call number is compared with the device number assigned to the own device, and communication is enabled only when the two match, and In this case, communication is disabled, so that one of a plurality of terminal stations can be selected from the public line telephone side, and the wireless telephone device can be called to perform one-to-one communication. There is an effect that a wireless telephone device capable of performing communication that does not want others to know the content can be obtained with security.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a wireless telephone device according to an embodiment of the present invention.

FIG. 2 is a flowchart showing the operation sequence.

FIG. 3 is an explanatory diagram showing a display example of a display device when a selective call signal does not match.

FIG. 4 is an explanatory diagram showing a display example of a display device when a selective call signal matches.

FIG. 5 is a block diagram showing another embodiment of the present invention.

FIG. 6 is a block diagram showing an outline of an MCA system using the present invention and a conventional wireless telephone device.

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

FIG. 8 is an explanatory diagram showing a display example of the display.

[Explanation of symbols]

 Reference Signs List 2 storage unit 4 transmission unit 5 reception unit 13 DTMF signal detection unit 14 control unit 20 terminal station 30 central station 40 public line telephone In the drawings, the same reference numerals indicate the same or corresponding parts.

Claims (1)

(57) [Claims] 1. A plurality of terminal stations 20 to which the same group code is given are arranged in each terminal station of a wireless communication system that communicates via a central station 30, and transmit a radio wave modulated by a transmission signal to the central station. A transmitting unit 4 for transmitting to a station, a receiving unit 5 for receiving and demodulating a radio wave transmitted from the central station, a control unit 14 for controlling transmission and reception in the transmitting unit and the receiving unit, A wireless telephone device provided with a storage unit 2 for storing the device number of its own device, which is used by the control unit for transmission / reception control, wherein a push button input by a combination of numbers from a signal demodulated by the reception unit; A push-button dial signal detecting unit 13 for detecting a selective call signal by a dial signal is provided, and a selective call signal detected by the push-button dial signal detecting unit and a device number stored in the storage unit are compared. Only when a match is detected, an automatic response is performed to enable transmission / reception by the transmission unit and the reception unit, and in the case of a mismatch, the control unit has a function of disabling the transmission / reception. Wireless telephone device.