JPH04239231A - Radio telephony equipment - Google Patents

Abstract

PURPOSE:To obtain the radio telephony equipment capable of performing one- to-one communication while selecting one station from among plural terminal stations and accessing the radio telephony equipment. CONSTITUTION:A TMF signal detection part 13 detecting a selection calling signal due to the DTMF signal by demodulation signals from a reception part is provided. The coincidence between the selection calling signal detected by this DTMF signal detection part 13 and the device number of the self-device stored in a storage part 2 is detected, and the communication can be performed only when the coincidence is detected. A control part 14 is equipped with a function making the communication impossible in the case of an incoincidence.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention relates to a wireless telephone device in a multi-channel access (hereinafter referred to as MCA) system, etc., in which a plurality of terminal stations given the same group code communicate via a central station. The present invention relates to a wireless telephone device capable of communicating with a telephone installed on 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 device of this type. In the figure, reference numeral 1 denotes a control section that performs overall control of the wireless telephone device, and reference numeral 2 denotes a storage section that stores the device number of the own device, which is used by the control section 1 when controlling transmission and reception.

[0003] Reference numeral 3 is a microphone into which an audio signal to be transmitted is input, and reference numeral 4 is a transmitter that transmits radio waves obtained by modulating a carrier wave with the audio signal. 5 is a receiving section that demodulates the received radio waves, and 6 is a switch that turns on/off the received signal demodulated by the receiving section 5.

[0004] Reference numeral 7 denotes a tone generating section that generates a signal tone to notify the user of an incoming call, etc., according to instructions from the control section 1. Reference numeral 8 denotes an amplifier that amplifies the received signal that has passed through the switch 6 and the signal sound that is sent out from the tone generator 7. A speaker 9 outputs the output signal of the amplifier 8 as an audio signal.

Reference numeral 10 denotes a press talk switch (hereinafter referred to as PT switch) for instructing the control unit 1 to switch between transmission and reception. Reference numeral 11 is a display device for displaying the status of the wireless telephone device, and reference numeral 12 is an interface circuit for connecting the display device 11 to the control section 1.

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

The radio telephone device shown in FIG.
1 and communication center 22, and perform group communication between them. Note that if there is no particular distinction between each of these mobile stations 21 and the communication center 22, the reference numeral 20
collectively referred to as a terminal station. 30 is a central station that relays and controls the communication of the terminal station 20, and 40 is this central station 3.
This is a public line telephone that is accommodated in 0 through a public line.

Next, the operation will be explained. Here, M.C.
In the A system, a plurality of terminal stations 20 given the same group code can communicate with each other, and each terminal station 20 is preset with an individual device number, which is assigned to a wireless telephone device. It is stored in the storage unit 2 of.

[0009] The control unit 1 sends out a signal including this device number at the beginning or end of communication, and connects a plurality of terminal stations 20 to one.
It implements a selective calling function that allows communication only with stations, and displays the device number of the communication partner on the display 11. Furthermore, when the control section 1 receives this signal, the tone generation section 7
is controlled to send out a predetermined signal tone to acoustically notify the user of the wireless telephone device.

[0010] In such an MCA system, communication is also possible between the public line telephone 40 and the radio telephone equipment of each terminal station 20. In that case, first, the telephone number assigned to the terminal station 20 with which communication is desired is input from the public line telephone 40 side and a call is made.

[0011] The central office 30 that received the call checks the availability of communication channels, and if there is an available communication channel, designates a channel including the group code corresponding to the telephone number (hereinafter referred to as PSTN simultaneous channel designation). ) is sent by radio to each terminal station 20, and the public line telephone 4
0 and the radio telephone devices of each terminal station 20 of a predetermined group are relayed.

[0012] The radio telephone device of each terminal station 20 is connected to the central station 3.
The receiving section 4 receives and demodulates the radio waves from 0, and sends the demodulated signal to the control section 1. The control unit 1 decodes the demodulated signal, and when it receives a PSTN simultaneous channel designation signal from the central station 30 with the same group code as its own station, it controls the interface circuit 12 and displays it on the display 11.

FIG. 8 is an explanatory diagram showing an example of the display. As shown in the diagram, the word “all at once” indicates that it is a simultaneous communication,
and the words "area occupied" indicating that the area is occupied are displayed.

Thereafter, the control section 1 sets communication channels to the transmitting section 4 and the receiving section 5, and further controls the switch 6 to send the demodulated signal from the receiving section 5 to the amplifier 8, and causes the speaker 9 to output audio. On the other hand, when the PT switch 10 is in the on state, the audio signal from the microphone 3 is sent to the transmitter 4 and transmitted on radio waves.

[0015]

[Problems to be Solved by the Invention] Since the conventional wireless telephone device is configured as described above, the public line telephone 40
When calling the terminal station 20 from the public line telephone 40
There was a problem in that the content of the communication could be received by the radio telephone devices of each terminal station 20 of the same group code, and it was impossible to communicate without the content being known to other people in the group.

The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to obtain a radio telephone device that enables communication by selectively calling only one radio telephone device with which one wishes to communicate from a public line telephone. With the goal.

[0017]

[Means for Solving the Problems] A radio telephone device according to the present invention is provided with a DTMF signal detection section that detects a selective calling signal based on a push button dial signal (hereinafter referred to as a DTMF signal) from a demodulated signal from a reception section. , causing the control unit to detect a match between the selective call signal detected by the DTMF signal detection unit and the device number stored in the storage unit;
It has a function that enables communication only when a match is detected, and disables communication when there is a mismatch.

[0018]

[Operation] When the DTMF signal detection section detects a selective call signal, the control section in this invention compares the selective call signal with the device number assigned to the own device stored in the storage section, and if the two match. By enabling communication only when the case is different and disabling communication when there is a mismatch, it is possible to select one station from among multiple terminal stations from a public line telephone, call that radio telephone device, and communicate. Realize a telephone device.

[0019]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An 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 transmitter, 5 is a receiver, 6 is a switch, 7 is a tone generator, 8 is an amplifier, 9 is a speaker, 10 is a PT switch, 11 is a display, 12 is an interface circuit, and the same reference numerals are shown in FIG. The detailed explanation will be omitted since it is the same as or equivalent to the conventional ones with .

13 is a DT for detecting a selective calling signal consisting of a DTMF signal input as a combination of numbers from among the received signals received and demodulated by the receiving section 5;
This is an MF signal detection section.

14 detects a match between the selective call signal detected by this DTMF signal detection section 13 and the device number assigned to the radio telephone device stored in the storage section 2, and a match is detected. In FIG. 7, reference numeral 1 is provided, in that the function is provided with a function that automatically responds only when the transmission section 4 and the reception section 5 match, and makes communication between the transmission section 4 and the reception section 5 impossible, and disables the communication when there is a mismatch. This is a different control unit from the one marked with .

Next, the operation will be explained. Note that the process from public line telephone 40 to calling the wireless telephone device of terminal station 20 and the start of communication is the same as in the conventional case, and therefore a description thereof will be omitted.

[0023] When this communication starts, the public line telephone 40
Accordingly, the device number of the wireless telephone device of the terminal station 20 with which one-to-one communication is desired is set. The setting method for this device number is, for example, if you want to communicate only with the device number: 001, press the dial button of the public line telephone 40 to “0”, “0”.
”, “1”, and “*” buttons in order. As a result, the DTMF signal corresponding to the pressed button is received by the radio telephone device of each terminal station 20 via the central station 30. Ru.

Here, FIG. 2 shows DTMF in a wireless telephone device.
3 is a flowchart showing a signal detection method and a control procedure. First, when communication with the public line telephone 40 is started in response to a command from the central office 30, initial settings are performed in step ST1. Here, the memory that stores the device number received in the DTMF signal is cleared.

Next, the control section 14 checks the signal detection of the DTMF detection section 13 in step ST2. When a signal is detected, step ST determines whether the detection continues for a certain period of time.
Find out in 3. After the detection continues for a certain period of time, step ST
4, it is checked whether the DTMF signal is off (no received signal). Regarding turning off this DTMF signal, step S
At T5, it is checked whether this has continued for a certain period of time.

[0026] When this off period continues for a certain period of time, the control unit 14 determines that one DTMF signal has been received. This is DT
Since the MF signal is received over a wireless line, this is a measure against fading, noise, etc., and is also a measure against chattering when the dial button on the public line telephone 40 is pressed.

[0027] When it is determined that a DTMF signal has been received,
It is determined in step ST6 whether the signal is a "*" signal (selective call end signal). If it is not a "*" signal, the received DTMF signal is set in the cleared memory in step ST7. Also,"*"
If it is a signal, the detection of the selective call 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, which has been predetermined and stored in the storage device 2, in step ST8. As a result, if the two do not match, the process proceeds to step 9, and a process of prohibiting communication is performed.

In this process of prohibiting communication, first, the interface circuit 12 is controlled to display the words "busy" as well as "all at once" and "area occupied" on the display section 11 as shown in FIG. Notify the user that communication is not possible. At the same time, the switch 6 is turned off to prevent the received demodulated signal from being output from the speaker 9, and even if there is a transmission request from the PT switch 10,
Sending is prohibited.

Furthermore, if the device number and the selective call signal match, as shown in FIG. It is displayed to the user of the telephone device that one-to-one communication with the public line telephone 40 is possible. At the same time, the tone generating section 7 is controlled to notify the user of this effect through a signal tone.

Furthermore, in order to notify the user of the public line telephone 40 that this selection signal has been received, an automatic response is performed using a voice band signal. For example, the control unit 14
The terminal station 20 automatically transmits the 1800 Hz MSK signal for one second when requesting communication to the central station 30.

After that, when the PT switch 10 is on,
The transmitting section 4 is controlled to transmit the sound from the microphone 3, and when the PT switch 10 is off, the sound is output from the speaker 9 in the form of a received signal in a receiving state.

[0033]A series of processes after a match between the device number and the selective call number is detected is executed in step ST10.

[0034] Furthermore, the detection of the selective calling number by the DTMF signal indicates the end of communication (on-hook using public line telephone).
If a match with the device number is detected, the communication enabled state is set, and if a mismatch is detected,
Set to a state where communication is impossible. As a result, the terminal station 2 that performs one-to-one communication from the public line telephone 40 during communication.
It is also possible to change 0.

In the above embodiment, transmission is performed when the PT switch 10 is on during communication, but when the selective paging signal is received, other terminal stations are in a state in which transmission is not possible. It may also be configured to send and receive. FIG. 5 is a block diagram showing such an embodiment. When a selective calling signal is received from the public line telephone 40, the PT switch 10 during communication becomes unnecessary, so the PT switch is removed in FIG. There is. The other parts are the same as those in the embodiment shown in FIG. 1, so the same reference numerals are given and the explanation thereof will be omitted.

[0036]

[Effects of the Invention] As described above, according to the present invention, the detected selective calling number is compared with the device number assigned to the own device, and communication is possible only when the two match. Since the configuration is configured so that communication is not possible in such cases, it is possible to select one station among multiple terminal stations from the public line telephone side, call that wireless telephone device, and perform one-to-one communication. This has the effect of providing a wireless telephone device that allows you to safely conduct communications where you do not want others to know the contents.

[Brief explanation of the drawing]

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 an example of the display on the display when the selective call signals do not match.

FIG. 4 is an explanatory diagram showing an example of the display on the display when the selective call signals match.

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

FIG. 6 is a block diagram showing an overview of an MCA system in which the present invention and a conventional wireless telephone device are used.

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 device.

[Explanation of symbols]

2. Storage section 4 Transmission section 5 Receiving section 13 DTMF signal detection section 14 Control section 20 Terminal station 30 Central office 40 Public line telephone In addition, in the figures, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Claims] Claim 1: A plurality of terminal stations 20 given the same group code are arranged at each terminal station of a wireless communication system in which they communicate via a central station 30, and transmit radio waves modulated by a transmission signal to the central station. a transmitting section 4 that transmits data to the central station; a receiving section 5 that receives and demodulates radio waves sent from the central station; a control section 14 that controls transmission and reception in the transmitting section and the receiving section; In a wireless telephone device comprising a storage section 2 for storing a device number of the own device, which is used by a control section to control transmission and reception, a push button is input by a combination of numbers from among the signals demodulated by the reception section. A push-button dial signal detection unit 13 is provided to detect a selective call signal based on a dial signal, and a match between the selective call signal detected by the push-button dial signal detection unit and the device number stored in the storage unit is detected. The wireless telephone device is characterized in that the control unit has a function of automatically responding to enable the transmitting unit and the receiving unit to transmit and receive only when a discrepancy occurs, and disabling the transmission and reception when there is a mismatch. .