JPS6027246A - Cordless telephone set - Google Patents

Abstract

PURPOSE:To obtain an inexpensive cordless telephone set by using radio communication only for the service part of a transmitter and a receiver and providing a telephone set body with a terminating means and a dial means for network control. CONSTITUTION:A telephone set body 1 includes hook switches FS1 and FS2, a dial part 12 which generates a network control selecting signal when the other- party telephone number is dialed, a telephone set circuit 13 for intermediation of call, a radio transmitter and receiver 14, and an antenna 15. The transmitter and receiver 14 consists of a transmitter 142, which modulates the sound signal from the circuit 13 and transmits it to a transmitter and receiver 2 through the antenna 15, and a receiver 141 which demodulates a signal inputted through the antenna 15 and reproduces the sound signal. The transmitter and receiver 2 consists of a transmitter 23, a receiver 24, a radio transmitter and receiver 22, and an antenna 21. The transmitter and receiver 2 communicates with the radio transmitter and receiver 14 with radio waves only in case of communication, and the telephone set body 1 performs originating and terminating operations similar to a normal telephone set.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cordless telephone, and particularly to a telephone in which the connection between the telephone main body and the handset is cordless.

Conventionally, so-called cordless telephones, in which the connection between the telephone and the handset is made cordless, are equipped with an incoming call means for detecting an output signal from the outside and a dial means for sending a selection signal for network control on the telephone body side and the handset side. Ta. Therefore, during oscillation, when the handset is removed from the telephone, the hook switch is activated, and the telephone first forms a DC circuit for the central office line and receives the dial tone from the exchange through the telephone central office line. , and further transmits the dial tone wirelessly to the handset side. The handset side receives this dial tone and outputs it to the handset. Next, the caller dials the telephone number of the other party using the handset and wirelessly sends a selection signal corresponding to the telephone number to the main body of the telephone. The telephone main body side receives this selection signal, converts it into a selection signal for controlling the network for the central office line using DC impulses or multi-frequency signals, and sends it out. It is sent wirelessly from the handset to the telephone, and from the telephone to the other party via the central office line and exchange. Voice signals from the other party are sent wirelessly from the telephone body to the handset.

In this way, conventional cordless telephones have a dialing function on the handset, and in addition to transmitting and receiving voice signals wirelessly, they also receive dial tones and send out selection signals to the telephone body, making the control procedure complicated. Also, there was a drawback that the equipment was expensive.

SUMMARY OF THE INVENTION An object of the present invention is to provide a new cordless telephone that overcomes the drawbacks of conventional cordless telephones.

In the present invention, the means for detecting an incoming call signal from the outside and the means for transmitting a selection signal for network control are all provided only in the telephone body, as in conventional ordinary telephones, and wireless is used only for transmitting and receiving voice signals. Make use of it.

Specifically, according to the present invention, there is provided a call receiving means for detecting a calling signal from a central office line, a dialing means for transmitting a network control selection signal to the central office line, and a hook switch for detecting attachment/detachment of a handset. Consisting of a telephone body equipped with a wireless transmitting and receiving means for transmitting and receiving audio signals using radio waves, a transmitter, a handset, and a transmitter and receiver equipped with a wireless transmitting and receiving means for transmitting and receiving audio signals using radio waves. A cordless telephone is obtained.

Next, embodiments of the present invention will be described with reference to the drawings.

The figure is a block diagram of one embodiment of a cordless telephone according to the present invention. In the figure, 1 is a telephone main body, and 2 is a handset. The telephone body 1 has a hook switch F81. F
82, and a dialing unit 12 that generates a network control selection signal corresponding to the telephone number when dialing the telephone number of the other party.
, a well-known telephone circuit 13 that mediates calls, a wireless transceiver 14, and an antenna 15. Wireless transceiver 1
4 is a transmitter 142 that modulates the audio signal input from the telephone circuit 13 and then sends it to the antenna 15;
The receiver 141 demodulates the signal input from the receiver 141 and reproduces the audio signal.

The handset 2 includes a transmitter 23 , a receiver 24 , a wireless transceiver 22 , and an antenna 21 . This wireless transceiver 2
2 consists of a receiver 222 and a transmitter 221 that operate in the same way as the receiver 141 and transmitter 142 described above.

When receiving a call, first press the office line terminal Ll on the telephone body 1.

A calling signal is sent from the exchange through the telephone office line to L2. The gy output signal passes through the hook switch F'SI and is guided to the incoming call detection section 11. This incoming call detection section 11 is a so-called bell circuit, and when a calling signal is sent, the bell rings to detect an incoming call.

After detecting an incoming call, when the handset 2 is lifted from the telephone main body 1, the point beside the hook switch F81,1;'82 operates as shown by the dotted line in the figure, and the incoming call detection unit is released and the hook switch i;'
The dial part 12 and the telephone circuit 13 are connected to S2, and a direct current loop is formed between the telephone circuit 13 and the terminal L2 of the station 1a, so that a telephone call can be made. That is, at this point, if the transmitter 23 of the handset 2 sends a response (for example, "Hi, Q○ Death"), the transmitter 221 of the wireless transmitter/receiver 22 of the handset 2 sends a response.
operates to modulate the audio signal input to the transmitter 23,
It is radiated from the transmitter/receiver side antenna 21 along with radio waves.

The antenna 15 on the main body side of the telephone receives this radio wave and guides it to the receiver 141 of the wireless transmitter/receiver 14 for sending and receiving calls. The receiver 141 selects the transmitter 23 from the received radio waves.
Demodulates and reproduces the audio signal input to the telephone circuit 13.
lead to. The voice signal input to the transmitter 23 in this manner enters the telephone circuit 13 and is sent to the other party via the telephone office line from the office line terminals L1 and L2.

On the other hand, the central line L1. The voice signal from the other party that has entered L2 is modulated by the radio transmitter 142 via the telephone circuit 13, and is emitted from the antenna 15 as radio waves. This radio wave is received by the antenna 21, and the transmitter side receiver 22
At step 2, the original audio signal is reproduced and reaches the handset 24, making it possible to talk.

Next, the operation when making a call will be explained.

When making a call, raise the handset 2 in the same way as a normal telephone, and the hook switch F81. F82 is not connected as shown by the dotted line in the figure, and the dial unit 12 performs dialing in the same manner as a normal power supply machine and sends out a network control selection signal. There is no wireless communication with the handset 2 until the network control selection signal is sent and a response is received from the other party. Only when the other party responds is the voice signal from the other party transmitted to the handset 2 in the same manner as when receiving a call. 2 reaches the receiver 24 of No. 2. After that, the transmitter 23,
Make a call using the receiver 24.

After the call is completed, place handset 2 on the hook switch.
Hook switch F81. F82B is restored and returns to the solid line connection in the diagram.

Therefore, according to this embodiment, since the communication between the handset 2 and the telephone main body 1' is only voice signal communication using radio waves, the telephone main body 1 cannot make and receive calls like a normal telephone. Ru.

As explained above, in the present invention, only the communication part using the transmitter and receiver is wirelessly communicated, and all dialing means for incoming calls and network control are provided in the telephone body, making the device simple and inexpensive. It is possible to realize a cordless telephone.

[Brief explanation of the drawing]

FIG. 11 is a block diagram of an embodiment of a cordless telephone according to the present invention. 1... Telephone body, Ll, L2... Office line terminal, FSI, F82... Hook switch,
11...Incoming call detection unit, ]2...Dial unit, 13...Telephone circuit, 14...
Wireless transmitter/receiver for sending and receiving calls on the telephone body side, -15...
...Telephone body side antenna, 2...Transmitter/receiver,
21...Transmitter/receiver side antenna, 22...
Transceiver (1tli wireless transmitter/receiver for sending and receiving calls, 23...
...Telephone, 24...Telephone receiver. ,′ Agent Patent Attorney Susumu Uchihara, ゛,）

Claims (1)

[Claims] A transmission means for detecting a calling signal from a central office line, a dialing means for sending a selection signal for network control to a central office line, a hook switch for detecting attachment/detachment of a handset, and transmission/reception of only voice signals by radio waves. A telephone body including a wireless transmitting/receiving means (i' A cordless telephone featuring