JPH04311130A - Portable telephone set - Google Patents

Abstract

PURPOSE:To offer a portable telephone set. CONSTITUTION:At the time of transmission, a transmission switch 27 and dialing circuit 28 respectively send a call signal and the telephone number of a telephone set 1 to an exchange 3 to start a calling state with the telephone set 1. At the time of termination, a frequency tuning circuit 20 detects a subscriber's number outputted from the exchange 3 and drives a buzzer 21 to inform termination and a response circuit 23 sends a response signal to the exchange 3 to start a calling state with the telephone set 1. Communication with the exchange 3 is executed by radio waves through a MODEM 29.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mobile phone, and more particularly to a telephone that is used as a terminal in an exchange in homes and offices, and is connected wirelessly to the exchange.

0002

2. Description of the Related Art Conventional telephones cannot be carried freely because they are connected to an exchange by wire, and it is not possible to leave the location where the telephone is placed when making or receiving calls.

0003

[Problem to be solved by the invention] However, the transmission,
It is very inconvenient to use a telephone because one cannot leave the telephone when making an incoming call and the range of movement is limited, and there has been a desire for a telephone that can easily make and receive calls anytime and anywhere.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a mobile phone that can easily make and receive calls anytime and anywhere by making and receiving calls wirelessly.

[0005]

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a dial operation means that outputs a calling signal and a telephone number of the other party based on an external operation when making a call, and a dial operation means that outputs a calling signal and a telephone number of the other party based on an external operation when making a call. a response means that compares the subscriber number with the own subscriber number and outputs an incoming signal when they match, and outputs a response signal based on external operation; and when the call ends, outputs a call termination signal based on external operation. a termination means for demodulating and outputting the dialing tone, ringing tone, voice and the subscriber number sent wirelessly from the exchange, as well as for outputting the calling signal, telephone number, response signal, end of call signal and input. and modulation/demodulation means for wirelessly transmitting voice to the exchange.

[0006]

[Operation] When making a call, the dial operation means sends a calling signal to the exchange based on the caller's operation, and when the dial tone from the exchange arrives, the dialing means sends the telephone number of the other party to the exchange based on the caller's operation. Send and enter call state.

[0007] When a call arrives, the response means checks the subscriber number from the exchange, and when it matches its own subscriber number, outputs an incoming call signal to notify the called party. Then, based on the operation of the called party, a response signal is sent to the exchange and the call state is entered.

[0008] Note that notification of the end of the call to the exchange is performed by a call termination means, and communication with the exchange is performed wirelessly by a modulation/demodulation means.

[0009]

Embodiment FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention. In the figure, 1 is a telephone that is another subscriber, 2 is a mobile phone, and 3 is an exchange. The exchange 3 accommodates the telephone 1, the mobile telephone 2, and many similar telephones and mobile telephones (not shown).

20 is a frequency tuning circuit that receives only radio waves of the same radio frequency as the unique frequency assigned to the mobile phone 2, which checks the demodulated selection signal (4-digit number) and checks the input subscriber. Checks the number, outputs reception preparation completion signal, etc. 21 is a buzzer that emits a ringtone (for example, beep-beep) to notify of an incoming call; 22 is a response switch for setting a response state; 23 is a response circuit that outputs a reverse signal (response signal); 24 is a transmitting/receiving circuit;
25 is an earphone, 26 is a microphone, 27 is a call switch that outputs a calling signal, 28 is a dial circuit that outputs the telephone number of the other party by dialing, and 29 is a circuit that sends various signals from the mobile phone 2 to the exchange 3 in a predetermined manner. This is a modulation/demodulation circuit that converts signals into radio frequencies and transmits them, and receives and demodulates various signals sent from the exchange 3 at a predetermined radio frequency.

Next, the operation of this embodiment will be explained based on FIG.

First, a case in which a call is made from telephone 1 to mobile telephone 2 will be explained. When a caller makes a call from telephone 1 and a call is received on mobile telephone 2, exchange 3 transmits a selection signal (a four-digit number) at a specific radio frequency. The frequency tuning circuit 20 of the mobile phone 2 receives and demodulates the radio frequency when it is a frequency assigned to the mobile phone 2 in advance. Further, when the four-digit number of the demodulated calling signal matches the number assigned in advance to the mobile phone 2, a reception ready signal is sent to the exchange 3 via the modulation/demodulation circuit 29.

[0013] Here, it is assumed that the plurality of mobile telephones accommodated in the exchange 3 are divided into a plurality of groups, and a specific four-digit number is assigned to each group. This makes it possible for the exchange 3 to select a specific group using one radio frequency, thereby making effective use of radio frequencies.

[0014] When the exchange 3 receives the reception preparation completion signal, it wirelessly transmits the number dialed by the telephone 1, that is, the subscriber number of the mobile telephone 2. This subscriber number is received by the modulation/demodulation circuit of the mobile phone 2, demodulated, and sent to the frequency tuning circuit 20. The frequency tuning circuit 20 checks whether this subscriber number matches the pre-assigned subscriber number of the mobile phone 2, and when they match, it detects an incoming call and drives the buzzer 21. The buzzer 21 generates a beeping tone to notify the called party of the incoming call. When the called party hears this ringtone and knows that there is an incoming call, he or she switches the response switch 22 to the response state side and enters the response circuit 23. As a result, the buzzer 21 stops operating. The response circuit 23 outputs a reverse signal (response signal) to notify the exchange 3 that it has responded. This reverse signal is sent to the exchange 3 via the response switch 22 and the modulation/demodulation circuit 29.

[0015] When the exchange 3 receives this reverse signal, it sets a communication state between the telephone 1 on the calling side and the mobile phone 2 on the called side. That is, the voice of the called party is input to the microphone 26 and sent to the modulation/demodulation circuit 29 via the transmission/reception separation circuit of the transmission/reception circuit 24. Modulation/demodulation circuit 29
converts this voice into a radio frequency and transmits it to the exchange 3. The exchange 3 demodulates the voice from the received radio waves and sends it to the telephone 1 on the calling side via wire.

On the other hand, the voice from the telephone 1 is sent to the exchange 3, which converts the voice into a radio frequency and transmits it to the mobile telephone 2. The modulation/demodulation circuit 29 of the mobile phone 2 receives the radio waves from the exchange 3 and demodulates them. The demodulated audio is output to the earphone 25 via the transmission/reception separation circuit of the transmission/reception circuit 24. The called party listens to the voice from the caller through the earphone 25. When the call is ended and the called party returns the response switch 22 to its original state (non-response state), the response circuit 23 stops outputting the reverse signal. The exchange 3 detects the stoppage of the reverse signal from the mobile phone 2 and cancels the call state setting. Note that instead of stopping the reverse signal, a signal indicating the end of an independent conversation may be sent.

Next, the case where the mobile phone 2 makes an outgoing connection to the phone 1 will be explained. When the caller operates the call switch 27 of the mobile phone 2, the call switch 27 outputs a call signal to the exchange 3 to notify that the call has been made. This calling signal passes through the modem circuit 29 to the exchange 3.
sent to.

By including the subscriber number assigned to the mobile phone 2 in the calling signal, the exchange 3 can easily identify the mobile phone 2 that has made the call.

When the exchange 3 detects the calling signal, it sends a dial tone, which is a dial tone, to the mobile phone 2 using radio frequency.
Send to. The modulation/demodulation circuit 29 of the mobile phone 2 is connected to the exchange 3
It receives radio waves from and outputs the dial tone. This dial tone is transmitted to the earphone 2 via the transmitter/receiver circuit 24.
5 is input. When the caller hears this dial tone through the earphone 25, the caller operates the dial circuit 28 and inputs the telephone number of the telephone 1. Dial numbers are output from the dial circuit 28 and sent to the exchange 3 via the modulation/demodulation circuit 29. Exchange 3 detects the dialed digits and sends telephone 1
When it learns that it is an incoming call, it sends a ringing signal to the telephone 1 and also sends a ringing tone to the mobile phone 2 by radio frequency. This ring tone is demodulated by the modulation/demodulation circuit 29 of the mobile phone 2, inputted to the earphone 25 via the transmission/reception circuit 24, and transmitted to the caller. When the exchange 3 detects a response from the telephone 1, the exchange 3 connects the telephone 1 and the mobile telephone 2 to enable a telephone conversation. Note that the operation at the end of the call is similar to the operation when making a call from the telephone 1 described above.

Note that the selection signal checking function and the reception ready signal output function in the frequency tuning circuit 20 of the mobile phone 2 described above are provided from the point of view of economical use of radio frequencies, and may be omitted. good.

[0021] If the mobile phone 2 described above is made into a card type by applying LSI technology, it will be more convenient to carry.

[0022]

Effects of the Invention As described above in detail, according to the present invention, a mobile phone and an exchange are connected wirelessly, and the mobile phone has the same functions as a normal wired phone. This makes it possible to move around and talk freely. It can also be used in the same way as a regular telephone. Furthermore, it can also be used as a follow-up telephone.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention.

[Explanation of symbols]

1　　　　Telephone 2 Mobile phone 3　　　　　Exchange machine 20 Frequency tuning circuit 21 Buzzer 22 Response switch 23 Response circuit 24 Transmission/reception circuit 25 Earphones 26 Microphone 27 Transmission switch 28 Dial circuit 29 Modulation/demodulation circuit

Claims (1)

[Claims] [Claim 1] Dial operation means for outputting a calling signal and a telephone number of the other party based on an external operation when making a call;
A response means that compares the subscriber number from the exchange and its own subscriber number when a call is received, outputs an incoming signal when they match, and outputs a response signal based on external operation; terminating means for outputting a call termination signal based on the call termination signal; a dial tone, a ring tone,
A mobile phone characterized by having modulation/demodulation means for demodulating and outputting voice and the subscriber number, and transmitting the calling signal, telephone number, response signal, end of call signal, and input voice to the exchange by radio. .