JPS62243461A - Cordless telephone system - Google Patents

Abstract

PURPOSE:To attain the use of a talking time display device at a terminal equipment by allowing a master equipment to detect the change in the polarity of a telephone line connected to an exchange, sending the result to a telephone set via a talking channel of a radio line, allowing the telephone set side to identify the information to apply control. CONSTITUTION:After a dial signal is sent from a cordless telephone set 5, when an opposite telephone set replies, an exchange 1 inverts the polarity of a wired telephone line 3. A polarity detection circuit 6 of a master equipment 2 detects the polarity inversion of the line 3, drives a polarity change information sending circuit 7 to send the polarity change information to the telephone set 5 via a talking channel of the radio line 4. The polarity change information identification circuit 8A of the telephone set 5 detects the inversion information to start a talking time display device 8B and to attain the talking. When the talking finished, the incoming side hooks on earlier and the line is disconnected, then exchange 1 is restored and the polarity of a sender subscriber is restored. The circuit 6 detects the polarity restoration and the restored polarity information is sent to the telephone set 5. The circuit 8A detects the polarity restoration, the device 8B is stopped to attain the use of a talking time display device at a terminal equipment.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to the control of a telephone in a cordless telephone system, in which a change in polarity of a telephone line (however, a wired section) is detected under the control of an exchange, and this is transmitted to a wireless line. The information is transmitted to the telephone via the telephone, and the telephone identifies and detects the information and performs the necessary control.

(Prior Art) FIG. 5 is a side view of the configuration of a conventional cordless telephone system, and FIG. 6 is an operational diagram of the conventional cordless telephone system. In the figure, the symbol l is an exchange, 2 is a parent device, 2A is an antenna, 3 is a subscriber line, 4 is a wireless line including a speech channel and a signal channel, 5 is a cordless telephone, and 5A is an antenna.

In the cordless telephone system, if the terminal is a regular telephone, there is no need to detect the polarity of the telephone line, and after channel acquisition, the connection in the wireless section is switched from the control (signal) channel to the speech channel, so the control signal is transmitted. Transmission and reception of lines were limited to ■■■ as shown in Fig. 6, and line polarity was not transferred. Therefore, it has the disadvantage that terminals that use line polarity (such as call time display devices) cannot be used.

(Specific Object of the Invention) When the called party answers, the polarity of the telephone line from which the call was made is reversed from normal (L+, , Lx 10) to (
L+ +, Lg). Furthermore, if the called party first disconnects the call, the polarity is reversed and returns to normal. Terminal add-on devices or high-performance telephones equipped with these functions are used to display call time, charge calculation, etc. using this function, and PBX reception desks, public telephones, etc. can also perform their functions by reversing the polarity. He is showing his full potential. Therefore, by transferring the polarity reversal information to the wireless section of the cordless telephone system, it is possible to make each of the high-performance terminals cordless, and it is also possible to make facsimile terminals, data terminals, key telephone main unit central office lines, etc. cordless. On the other hand, a return to normal from polarity reversal (
By adding a function to the terminal that immediately disconnects the communication channel upon detecting normal rotation, it is possible to prevent the shared wireless channel from being held invalid and the battery from being consumed ineffectively. The present invention aims to satisfy these needs.

(Structure of the Invention) FIG. 1 is a side view of the configuration of the cordless telephone system according to the present invention, in which a master device 2° and the wireless It consists of a line 4 and a telephone 5.

In the present invention, as shown in FIG. 1, the parent device 2 includes a polarity detection circuit 6 that detects polarity changes (inversion, normal rotation) of the telephone line, and a polarity detection circuit 6 that detects polarity changes (inversion, forward rotation) of the telephone line, and a polarity detection circuit 6 that sends polarity change information to the cordless telephone 5 via the wireless line 4. A polarity information sending circuit 7 is added, and the telephone 5 includes a polarity reversal information identification circuit 8A that receives and identifies the polarity reversal information, and a call time display device 8 that is controlled by the data of the identification result.
B is added.

FIG. 2 is a more detailed side view of the configuration of the parent device 2, where H is a hybrid coil, 2AS is a transmitting antenna, and 2AR is a receiving antenna, and the parts surrounded by broken lines are new functional parts added by the present invention.

FIG. 3 is a side view of the configuration of the telephone 5, in which 5AS and 5AR are transmitting antennas and receiving antennas, and 9 is an automatic recovery instruction signal t.

In addition, polarity reversal information is transmitted continuously for a certain period of time (identification time) by assigning two specific frequencies within the voice band to inversion and forward rotation, respectively, and this signal tone is clearly defined as busy tone, ring tone, etc. It must be possible to identify the sound, and identification of sounds of a specific frequency and a certain length of time can be easily performed using known circuits.

(Operation of the Invention) The operation of the present invention is as shown in FIG. 4. The operations 1 to 2 in FIG.

1. After the cordless telephone sends a dialing signal, when the called party's telephone answers, the exchange reverses the polarity of the wired telephone line.

2. The polarity detection circuit 6 of the parent device detects the polarity reversal of the telephone line, drives the polarity reversal information sending circuit 7, and sends the polarity reversal (reversal) information to the telephone 5 side via the communication channel of the wireless line.

3. On the telephone 5 side, the polarity reversal information identifying circuit 8A detects the reversal information, activates the call time display device 8B, and makes it possible to start a call. (The configuration of 8B is well known.) 4. When the call ends and the called party goes on-hook first and disconnects the line, the exchange is restored and the polarity of the calling subscriber's circuit is reversed. At this time, a busy tone is also transmitted.

5. The polarity detection circuit 6 of the parent device detects the normal rotation and sends polarity information of the normal rotation to the telephone 5.

6. On the telephone 5 side, the polarity reversal information identification circuit 8A detects normal rotation and stops the device activated in the previous sections 3: to 5, and forcibly disconnects the communication channel.

(Effects of the Invention) By transmitting the polarity information of the telephone line to the terminal side of the cordless telephone system, it becomes possible to display call time, charge information, call destination, automatic recovery, and other advanced functions on the terminal. Furthermore, it is expected that public telephones, PBX reception desks, key telephone main units, etc. will be made cordless, and it will also be possible to introduce facsimile machines, data terminal devices, image terminal devices, etc. into the terminals.

[Brief explanation of drawings]

FIG. 1 is a side view of the configuration of a cordless telephone system according to the present invention;
FIG. 2 is a side view of the configuration of the parent device in FIG. 1, FIG. 3 is a side view of the configuration of the cordless telephone in FIG. FIG. 6, a side view of the structure of the cordless telephone system, is an explanatory diagram of the operation of the conventional system. DESCRIPTION OF SYMBOLS 1... Exchange, 2... Parent device, 2A, 5A... Antenna, 2AS, 5AS... Transmission antenna, 2AR. 5AR...Receiving antenna, 3...Subscriber line, 4.
. . . Wireless line, 5 . . . Cordless telephone, 6 . . . Polarity detection circuit, 7 .・・・
・Automatic recovery instruction signal. 3rd 10th Figure 2

Claims (1)

[Claims] In a cordless telephone system comprising a cordless telephone and a parent device connected to the telephone by a wireless line and connected to a telephone exchange by a wired line, the parent device shares one or more wireless channels. It is equipped with a circuit that detects and transmits changes in the polarity of the telephone line connected to the exchange, and transmits the polarity change information to the telephone side via the communication channel of the wireless line, and the telephone side communicates with the polarity change information identification circuit and the call time. A display device is provided to detect the polarity change information, and when the information changes from normal to reverse, the call is started and the call time display device is activated, and when the information changes from reverse to normal, the call is started. A cordless telephone system characterized in that the time display device is stopped and the telephone itself disconnects the communication channel.