JPH0799687A - Cordless telephone system, connection device and receiver - Google Patents

Abstract

PURPOSE:To provide a cordless telephone system capable of calling a user present outside of a communicable range. CONSTITUTION:This connection device 2 provides the connection function on a radio channel of a first slave station {a slave station (a)} 29 provided with a transmission/ reception function with a telephone set connected through a wire connection line 10 and a second slave station {the slave station (b)} 30 not provided with the transmission/reception function and provided only with a calling (notification) function. The slave station 20 is provided with the function similar to the slave unit of a general cordless telephone and the slave station 30 is not provided with a communication function and provides only the calling function. The user of the telephone set 11 operates the connection device 2 by the key input of the telephone set 11 and transmits the calling signals of a low data speed including the identification code of the slave station 3U. The slave station 30 receives and detects the calling signals, generates calling sound by a notification circuit 31 and informs callee C of the fact of an incoming call. By turning the data speed of the calling signals lower than the data speed of the voice signals of communication, the callee carrying the slave station 30 present outside of the communicable range can be called.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to cordless telephone systems. More specifically, the present invention can call a user (callee) who is in a place beyond the communication range of a conventional cordless telephone, and is less susceptible to interference such as noise. The present invention relates to a cordless telephone system and a connecting device and a receiving device used for the cordless telephone system.

[0002]

2. Description of the Related Art FIG. 20 is a diagram showing a configuration example of a conventional cordless telephone system 9. This cordless telephone system 9 is similar to a conventional general household cordless telephone, which is composed of a connection device 7 and a slave station 8. The connection device 7 is a so-called base unit of a cordless telephone, controls a wireless communication line with a slave station 8 that is wirelessly connected, and relays a voice signal between the slave station 8 and a wired communication line 70. I do. The wired communication line 70 is, for example, a subscriber line connected to a general telephone network or a private line connected to a private branch exchange, and in the present invention, a "wired communication line" is used regardless of the type of line. write.

The connection device 7 has a line control device 72, a transmission / reception device (circuit) (TRX) 73, a telephone set 71 and an antenna 74. The line control device 72 uses the wired communication line 70.
It has a ringer detection circuit, a speech network circuit, etc. which are input from the device, provides the function of a telephone call circuit necessary for connecting the wired communication line 70 and the connection device 7, and controls the transmission / reception circuit 73 to control the wireless line. Settings are made and the overall connection device 7 is controlled. The telephone (TEL) 71 is a telephone attached to the connection device 7 and performs functions as a general telephone, that is, functions such as transmission, reception, dial transmission, and ringing (bell) generation. Transmitter / receiver 73
Transmits and receives control signals and voice signals to and from the slave station 8 on the wireless line set by the control of the line controller 72. The antenna 74 is used for wireless transmission between the connection device 7 and the slave station 8.

The slave station 8 has a transmitting / receiving circuit 83, a slave station controller 82, a handset 81 and an antenna 84. The transmission / reception device (TRX) 83 transmits / receives control signals and audio signals to / from the connection device 7. The slave station controller 82
The transmission / reception device 83 is controlled according to a control signal sent from the line control device 72 via the wireless line between the antenna 74 and the antenna 84 to set the wireless line, and also to control the entire slave station 8. The handset 81 performs a sending function and a receiving function, like a handset of a general telephone. The antenna 84 transmits / receives a control signal and a voice signal to / from the connection device 7 on a wireless line formed between the antenna 84 and the antenna 74 facing each other.

The operation of the conventional cordless telephone system 9 will be described below with reference to FIG. The cordless telephone system 9 performs the following four operations. First Operation Mode First, the caller's telephone (not shown) makes a call to the connection device 7 (incoming call) via the wired communication line 70.
The case will be described. When the connection device 7 receives an incoming call, the line control device 72 detects the incoming call by detecting a ringer signal or the like, and rings the telephone 71. Furthermore, the line control device 7
Reference numeral 2 controls the transmission / reception circuit 73, and transmits / receives a control signal to / from the slave station 8 via the transmission / reception circuit 73. Slave station control device 8
2 controls the transmission / reception device 83, and transmits / receives a control signal to / from the connection device 7 via the transmission / reception device 83. This control signal is transmitted and received by, for example, “250 MHz / 380 MHz
Cordless telephone radio station radio equipment standards (RCR
STD-13: Radio System Development Center 1988 1
It will be performed according to the line connection method on the control channel specified in "Established on October 27)". Upon receiving this control signal, the slave station control device 82 rings the bell (not shown) of the handset 81 of the slave station 8. When the called party disconnects the handset 81 of the slave station 8 (off-hook) in response to the call,
Alternatively, if the called party goes off-hook on the telephone 71,
The line control device 72 connects the telephone 71 or the handset 81, which has been previously off-hook, to the wired communication line 70, and sets the call line.

Second Operation Mode Next, the case of making a call from the telephone set 71 will be described. When there is an off-hook of the telephone set 71 by the called party at the telephone set 71, the line control device 72 connects the telephone set 71 and the wired communication line 70 to set up a call line.

Third Operation Mode Further, a case of making a call from the slave station 8 will be described. When the caller goes off hook of the telephone 81 of the slave station 8, the slave station control device 82 transmits / receives a control signal to / from the line control device 72 of the connection device 7 via the transmission / reception device 83 to set the wireless line. To do. Further, the line control device 72 connects the wired communication line 70 and the slave station 8 and sets a communication line between them.

A case where a telephone call is made between the telephone 71 in the fourth operation mode and the handset 81 of the slave station 8 will be described. When the user requests the communication in the cordless telephone system 9 at the connection device 7 or the slave station 8, the line control device 72 and the slave station control device 82 transmit and receive a control signal to transmit between the antenna 74 and the antenna 84. Set up a wireless line. Cordless telephone system 9 described above
By this operation, the user carrying the slave station 8 having the handset 81 uses the slave station 8 to make a call, or receives an incoming call from the wired communication line 70 or the like, and receives the connection device 7 or wired communication. A call can be made with a telephone terminal (not shown) via the line 70.

The operation of a telephone user (caller or called party) when making a call using the cordless telephone system 9 or a general wire telephone will be described below. FIG. 21 is a diagram showing a schematic positional relationship among a plurality of users A, B, C, and D when intermediating a telephone call when using a general wired telephone. In this example, the calling party A from the telephone 91
When the called party C is called, the called party C is located away from the telephone set 92, and there is an agent B or an agent D near the telephone set 92, and the called party A is called. It shows the case of transferring to C. 21 and 22,
Telephones 91 and 92 are switchboards (not shown) using wired communication lines.
It is a general wired telephone that is connected via, for example. Figure 2
FIG. 2 is a procedure (sequence) diagram for explaining the operation of each user (caller, called party, agent) shown in FIG. The outline of the procedure is as follows.
1 is used to make a call (call) to the telephone set 92 to call the called user C (callee). The agent B who was closer to the telephone 92 than the called party C
The telephone 92 responds to the incoming call from the telephone 92 by off-hook. The agent B hears the content of the call from the caller A and relays the call to the called party C. The operation of each user (calling party, calling party, called party) described below is performed by the telephone 91, the telephone 9
2 is a telephone set 71 of the connection device 7 in the cordless telephone system 9 and a handset 81 of the slave station 8; The telephone 71 or the handset 81 in the cordless telephone system 9 may be used.

The operation of each user will be described with reference to FIG. The following sequences (1) to (7) correspond to the symbols attached to the respective operations (sequences) shown in FIG. Sequence (1): The calling party A uses the calling side telephone 91 to make a call to the called side telephone 92 (calling). Sequence (2): The agent B off-hooks the telephone 92 on the called side to receive the call (response 1). Sequence (3): The calling party A informs the agent B that he / she wants to talk with the called party C (call request). Sequence (4): The agent B makes the caller A wait (response 2). Sequence (5): The agent B goes to the called party C himself or calls the called party C by calling the agent D (calling). Sequence (6): The called party C is called by the agent B, and the called party C reaches the telephone set 92 (response 3). Sequence (7): The called party C uses the telephone 92 to talk to the calling party A (call).

As described above, when there is no other party (callee C) near the telephone 92 and there is someone other than the other party (agent B), the caller A picks up the telephone 92. It is necessary to have the agent B make a phone call. in this case,
In the operation of sequence (5), the following operation is required for the transfer of the telephone. When the called party C is near the agent B, the called party C can be immediately answered by the telephone set 92, so there is no problem. However, the agent B is the called party C
If he does not know his whereabouts, the agent B needs to find the called party C. Further, even if the agent B knows the location of the called party C, if the agent B is not nearby, the agent B
To call the called party C, the agent B must go to the called party C, or the agent B needs to call out the called party C in a loud voice. Therefore, calling the called party C is a time-consuming and labor-intensive operation for the agent B. Also,
Even when the called party C is asked by another agent D near the agent B, the agent D may perform the same operation as the agent B described above, and the agent D also acts as the agent. The same burden as B may be applied.

If the agent B and the agent D do not have to perform the operation when calling the telephone, the agent B and the agent D can continue their work without interruption, There is no decrease in efficiency. That is, the operation of the sequence (5) of FIG. 22 in the above-mentioned conventional telephone agency procedure causes a problem that the agency B and the agency D in the surroundings reduce the work efficiency. Further, if no agent is present near the telephone set 92, the calling party A cannot talk to anyone other than the called party C.

[0013]

In the above-mentioned conventional cordless telephone system, the output power of the radio wave signal used between the connection device and the slave station is, for example, 10 mW.
Due to the limited degree, the signal reaching the slave station has a limited reach. Therefore, if the distance between the slave station and the connection device exceeds this reach, even if there is an incoming call, the bell of the slave station does not ring and the called party or the agent cannot know the incoming call. . In addition, the calling party (callee) intended by the calling party may not pick up the call directly. In this case, as described above, there is a problem that the telephone intermediary operation wastes time for the user of the telephone at the called side or requires unnecessary labor. Further, there may be a case where the called telephone does not respond as described above.

The present invention has been made in view of the above-mentioned problems of the prior art, and an object of the present invention is to extend the range of communication in the conventional technology with a new technology so that the communication in the conventional technology can be performed. It is possible to call a user (callee) who is out of the range, and at the time of telephone transfer, the transfer agent searches for the other party or calls out loud, which saves unnecessary labor and time. It is to provide a cordless telephone system capable of reducing waste. Another object of the present invention is to provide a cordless telephone system, a connection device and a receiving device, which are capable of performing communication over a longer distance and are resistant to interference by applying a spread spectrum communication method to a cordless telephone. It is in. Yet another object of the present invention is to provide means for allowing a called party to answer an outgoing call at the called station.

[0015]

In order to achieve the above object, the cordless telephone system of the present invention has a connection means corresponding to, for example, a master station and a reception means corresponding to a slave station, which are wirelessly connected. . The connection means, in response to a predetermined call request to the reception means, includes a unique identification code for the reception means, and sends the call signal to the reception means as a radio wave signal at a lower data rate than the call control signal. It has a sending means. The receiving means has a notifying means for notifying an incoming call by identifying that the identification code included in the paging signal having a data rate lower than that of the received call control signal is an identification code unique to the receiving means of itself. By using the identification code, the corresponding receiving means can be specified and called, and an erroneous call can be prevented. Also, since the call is made at a lower data rate than the call signal, the reach of the ringing tone is extended.

[0016] Preferably, a call means for transmitting and receiving a voice signal to and from the connecting means by radio, and a voice transmitting and receiving means connected to the connecting means for transmitting and receiving a voice signal to and from the call means by radio. Further has. This enables a call between the connection device and the slave station. Further, preferably, the receiving means and the calling means are integrally formed. As a result, it is possible to realize a receiving means incorporating a compact call means. Also preferably, the voice call unit further includes a notification unit. As a result, the outgoing call can be confirmed directly in the voice call means. Further preferably, the connecting means is connected to a wired communication line, detects an incoming call from the wired communication line, and sends a calling signal to the calling signal sending means when an incoming call from the wired communication line is detected. It further comprises incoming call detection means. As a result, the connection device can also respond to the call.
Further preferably, the connection means further includes operation information input means for inputting operation information, and the calling signal sending means sends the calling signal to the calling signal sending means in accordance with the operation information input from the operation information input device. Send it out.

Further preferably, the connecting means further comprises a spread spectrum means for spectrum spreading the calling signal and inputting the calling signal after the spread spectrum to the calling signal transmitting means, and the receiving means or the voice transmitting / receiving means. Further, there is further provided spectrum despreading means for despreading the received call signal and inputting it to the notifying means in response to the spread spectrum. The use of spread spectrum has advantages such as speedy establishment of synchronization, improvement of radio wave interference, improvement of radio wave interference, and common bandwidth.

Further, the connection device used in the cordless telephone system of the present invention is a device for calling a receiving device having a unique calling code, and in response to a predetermined calling request, an identification code unique to the receiving device. And a call signal sending means for sending the call signal to the receiving means as a radio wave signal having a lower data rate than the call control signal. Further, preferably, it further comprises a spread spectrum means for spectrum spreading the calling signal output from the calling signal generating means and inputting it to the calling signal transmitting means.

Further, the receiving device used in the cordless telephone system of the present invention receives a calling signal which is transmitted as a radio wave signal and includes an identification code unique to the receiving device and which has a lower data rate than the call control signal. It has a receiving means and an incoming call notifying means for detecting an identification code unique to the receiving device included in the received call signal and notifying an incoming call when the identification code is detected. Further, preferably, the ringing signal is a spectrum-spread signal, and has a reverse spectrum spreading in which the ringing signal output from the ringing signal receiving means is subjected to despreading and input to the incoming call notifying means.

More preferably, in the cordless telephone system of the present invention, a response instructing means for the called party to respond to the calling party is provided on the slave station side having no telephone function. As a result, even when the called party is away from the handset, it becomes possible to respond to the calling without going through the agent. The response instructing means may be capable of automatic response.

[0021]

When the call signal generator of the connection device of the cordless telephone system of the present invention receives an incoming call, the call signal including the call code of the slave station is transmitted on the radio line at a remarkably low data rate. The error occurrence rate during the transmission is reduced, and the ringing signal is made to reach the slave station of the user who is out of the communication range. The slave station receiving this call signal generates a call signal and notifies the user of the fact that there is an incoming call by notifying the user of the call in the form of voice or the like. Therefore, it is not necessary to transfer a telephone call to a user who has a slave station and is out of the communication range, and unnecessary labor for calling another user is not required. Also,
Users who are farther from the connection device can reduce the influence of disturbance such as noise by using the voice signal and ringing signal of the call to spread spectrum and modulate, and reduce the influence of disturbance such as noise. The call signal is made to reach the slave station owned by.

Further, by providing a response instructing means in the slave station which does not have a telephone set, the called party can automatically respond.

[0023]

The first embodiment of the cordless telephone system of the present invention will be described below. FIG. 1 is a diagram showing the configuration of a cordless telephone system 1 according to the first embodiment of the present invention. The cordless telephone system 1 includes a connection device 2, a first slave station (slave station a) 20 having a transmission / reception function, and a second slave station (slave station having no transmission / reception function but only a call (transmission) function). Station b) 30. The connection device 2 is connected to the wired communication line 10 and performs line control between the wired communication line 10 and each of the slave stations 20 and 30 and sets a wireless line and relays a voice signal. Slave station 20 having transmission / reception function
Is a telephone terminal similar to, for example, a cordless handset of a general cordless telephone, and is connected to the telephone (TEL) 11 of the connection device 2 or the other telephone terminal via the connection device 2 and the wired communication line 10 (see FIG. (Not shown) to perform a call function.
The slave station 30 does not have a call function, but only performs a call function. The slave station 20 and the slave station 30 do not necessarily have to be housed in separate housings, but may be housed in the same housing.

The wired communication line 10 is a general wired line including a general telephone line, a subscriber line of a private telephone network, or other relay lines. The telephone 11 is connected to the connection device 2 and performs a call function, a calling function, a dialing function and the like similar to a general telephone, and further, a cordless telephone system 1 of the present invention is operated by a user's dial operation. It is used for inputting operation information when calling the station 30.
The line control device 12 includes, for example, a control one-chip microcomputer, a speech network circuit, and the wired communication line 1.
0, and a call circuit for setting a call path between the telephone 11 or the slave station 20, and the like. The transmitter / receiver circuit 13 is controlled to change the transmission / reception frequency, and the like. Control signals are transmitted to and received from the slave station 30 and the slave station 30 to perform control for setting a wireless line, and also to set a communication path, convert two-wire to four-line, detect an incoming call, and control the entire connection device 2. Carry out a function. Transmitter / receiver circuit 13
Performs transmission / reception of a radio wave signal for transmitting a voice signal and a control signal between the slave station 20 and the slave station 30. Antenna 14
Is used for transmitting and receiving a radio signal between the connection device 2 and the slave station 20 via the antenna 24 or between the slave station 30 via the antenna 34.

On the side of the slave station 20 having a transmitting / receiving function,
The handset 21 performs the same voice input / output function as the handset of a normal telephone. The slave station control device 22 transmits / receives a control signal to / from the connection device 2 to set a wireless line and control the slave station 20 as a whole. The transceiver circuit 23 is
Radio signals for transmitting voice signals and control signals to and from the connection device 2 are transmitted and received. The antenna 24 is used for transmitting and receiving radio wave signals between the slave station 20 and the connection device 2.

On the side of 30 having only the calling (transmitting) function without the transmitting / receiving function, the receiving circuit 33 receives the control signal sent from the connection device 2 to the wireless line, detects the calling signal, and the transmitting circuit. The user of the slave station 30 is notified of the fact of the incoming call via 31. Under the control of the receiving circuit 33, the transmission circuit 31 generates a ringing tone and notifies the slave station 30 of the ringing. The antenna 34 is used for receiving a radio signal from the connection device 2. For example, the frequency of the wireless line and the line setting in the cordless telephone system 1 are set to “25
0 MHz / 380 MHz cordless telephone radio station radio equipment standard (RCR STD-13: Radio System Development Center, established October 27, 1988) ”.

FIG. 2 is a block diagram of the transmission / reception circuit 13 in the connection device 2 shown in FIG. The transmission / reception circuit 13 includes a call signal generation circuit 131, a modulation circuit 133, and a carrier wave generation circuit 13.
2 and a power amplifier circuit 134. For simplification of the illustration, FIG. 2 shows only the transmission system of the transmission / reception circuit 13 and omits the configuration of the reception system. 2 which are not described below are the same as those shown in FIG. 1 with the same reference numerals. Call signal generation circuit 13
1 controls the line controller 12 according to the operation information input by the dial operation on the telephone 11 of the user to generate a digital call signal for calling the slave station 30 and apply the call signal to the modulation circuit 133. . Carrier wave generation circuit 13
Reference numeral 2 is composed of a phase synchronization circuit (PLL circuit) and the like, and generates a carrier signal (local oscillation frequency signal) of a predetermined frequency used for modulation of the modulation circuit 133 under the control of the line controller 12. The modulation circuit 133 is connected to the line control device 12
The carrier wave signal input from the carrier wave generating circuit 132 is modulated, for example, by BPSK modulation, with a voice signal, a control signal, and a calling signal input from the modulated radio wave signal. This radio signal is amplified by the power amplifier circuit 134,
Through the antenna 14, the antenna 24 and the antenna 34
Is emitted (radiated) toward. The power amplifier circuit 134
A radio signal from the modulation circuit 133 is supplied with a predetermined electric power, for example,
Amplify to 10 mW.

FIG. 3 is a block diagram of the second slave station 30 shown in FIG. 1, which does not have the transmission / reception function but has only the calling (transmission) function. The second slave station 30 has a reception circuit 33 and a transmission circuit 31. The reception circuit 33 includes a reception filter 331,
Reception circuit 332, detection circuit 333, error detection circuit 33
4. Has a ringing signal detection circuit 335. Receive filter 3
The antenna 31 receives the required frequency component of the input signal that is captured by the antenna 34 and converted into an electrical signal. The receiving circuit 33 includes a local oscillator circuit, a high frequency amplifier circuit,
An intermediate frequency circuit and a circuit necessary for receiving a radio wave signal such as a frequency conversion circuit are included. The radio wave signal is amplified to a level that can be detected by the detection circuit 333, and the detection circuit 33
Enter in 3. The detection circuit 333 performs, for example, BPSK detection of the radio wave signal amplified by the reception circuit 332, converts it into a digital signal, and inputs it to the error detection circuit 334. The error detection circuit 334 makes a majority decision on the output signal of the detection circuit 333 to determine the calling signal and the slave station 3.
Detect a call code unique to 0. In other words, the error correction circuit 334 determines that there is a significant signal when the same signal is detected twice or more within a predetermined time, for example, when the calling signal is continuously transmitted three times by the connection device 2, and this significant signal is detected. Input signal to the calling signal detection circuit 335. The call signal detection circuit 335 detects a call signal from the significant signals input from the error detection circuit 334, controls the call signal generation circuit 311 in the transmission circuit 31, and generates a call signal to the user. Notify the incoming call. The transmission circuit 31 is the calling signal generation circuit 3
11 and a speaker 312. The call signal generation circuit 311 generates a call voice signal under the control of the call signal detection circuit 335 and sends it from the speaker 312.

The cordless telephone system 1 of the present invention is different from the conventional cordless telephone system 9 shown in FIG. 20 in the following points. First, as a communication function between the connection device 2 and the slave station 20, like the conventional cordless telephone system 9, a function of identifying a signal from the connection device, setting a line, and then making a call, and a child It also has a function of setting the data rate (data rate) of the calling signal to a significantly low value and transmitting it for calling the station 30. The slave station 20 has only the latter calling function among the communication functions of the connection device 2 and the slave station 30 described above. That is, it has only the function of receiving and identifying the call signal from the connection device 2, and the telephone terminal or the telephone 11 via the wired communication line 10.
There is no function to make a call with. When the mobile station 30 identifies the call signal, the fact that the cordless telephone system 1 has received an incoming call is notified to the user who owns the mobile station 30 via the transmission circuit 31.

The call signal and its data rate will now be described. In the conventional cordless telephone system 9, when the slave station 8 is called, 600 bps to 240 bps
A control signal with a medium data rate such as 0 bps is used. On the other hand, in the cordless telephone system 1 of the present invention, a call signal having a short data length including the identification code of the slave station 30 and the signal type information of the call signal is used to call the slave station 30. This is because even if the above-mentioned calling signal is transmitted at a low data rate, the time required for calling is very short.

The reason why the call time is short will be described below. It is sufficient for the information included in the call signal for calling the slave station 30 to include the identifier of the slave station 30, and the amount of data is very small. For example, the data length of the calling signal is about 50 bits, which is much smaller than the amount of information required for transmitting a conversation on a general telephone or the amount of information required for call control. Therefore, even if the data rate is reduced to, for example, several tens bps, the time required for transmitting the identifier is 1 to 2 seconds, and the problem of taking too much time does not occur. The slave station 30 demodulates a calling signal obtained by modulating a low data rate signal, and the transmission circuit 31 causes the slave station 30 to perform demodulation.
It suffices to display and notify the user having the slave station 30 that the call has been made. Further, for example, message information of the caller's telephone number is added to the calling signal, a small display device is added to the slave station 30 to display this message information, and the user of the slave station 30 receives a call from whom. It is also possible to provide a service for notifying the user.

The operation of the cordless telephone system 1 will be described below. Here, the user A makes a call to the user C who possesses the second slave station 30 which does not have the transmission / reception function but has only the calling (transmission) function. User B is in the vicinity of the first slave station 20 having a transmission / reception function. The user A makes a call to the cordless telephone system 1 from a telephone (not shown) connected to the cordless telephone system 1 via the wired communication line 10. The line control device 12 of the connection device 2 detects an incoming call and causes the telephone 11 to ring. User B, who hears this ringing tone, goes off-hook from the telephone set 11 to enter the call. Here, the user A requests the user B to call the user C.

User B calls user C by calling
By operating the keys of the telephone 11 or the like, operation information for calling the slave station 30 to the line control device 12 is input. The line controller 12 controls the ringing signal generation circuit 131 to generate a ringing signal including the identification code of the slave station 30, and the modulation circuit 1
A radio signal is sent to the slave station 30 via 33 and the power amplifier circuit 134. When the slave station 30 receives and detects a calling signal including its own identifier by the antenna 34 and the detection circuit 333, the transmission circuit 31 generates a ringing tone and notifies the user C of the fact of the incoming call. User C knows that he / she has been called by hearing this ringing tone.

User C who knew that he / she was called
Goes to the location of the telephone 11 or the slave station 20 and uses any one of them to talk to the user A. At this time, the line control device 12 communicates with one of the telephone 11 and the first slave station 20 that the user C goes off-hook and the wired communication line 1.
Set up a communication path with 0. In addition to the above, the cordless telephone system 1 can also be composed of a plurality of connection devices 2, slave stations 20, and slave stations 30, respectively. The audio signal transmitted between the connection device 2 and the slave station 30 may be an analog signal or a digital signal. The method of notifying the user of the call from the transmission circuit 31 may be an auditory method using voice or a visual method such as blinking a light emitting diode or displaying a liquid crystal. Further, not only the telephone set 11 but also the slave station 20 may be configured to be able to perform a similar calling operation.

Further, a circuit that can be shared by the slave stations 20 and 30 may be shared, and the slave stations 20 and 30 may be integrated. In this case, the transmitter / receiver circuit 13 of the slave station 20 and the slave station 30
All or a part of the circuits such as the receiving circuit 33 can be shared. FIG. 4 is a configuration diagram in the case where the slave station 20 and the slave station 30 share a sharable circuit and the slave station 20 is incorporated into the slave station 20. A low-frequency amplifier circuit 313 is added for sharing. The parts other than the low-frequency amplifier circuit 313 are the same as the parts denoted by the same reference numerals in FIG. Figure 4
In FIG. 3, only the reception system of the slave station 20 is shown, and the transmission system is omitted. The low-frequency amplifier circuit 313 includes a voice signal input from the detection circuit 333 and a call signal generation circuit 31.
The ringing tone input from 1 is amplified.

The cordless telephone system 1 described above will be described with reference to FIG. FIG. 5 is a diagram showing a signal sequence of the cordless telephone system 1 of the present invention. Figure 5
In, the sequences (1) to (6) correspond to the numbers given in the following description, and the dotted line indicates a low data rate ringing signal. Sequence (1): User A calls the connection device 2 from the telephone terminal on the calling side through the wired communication line 10 (calling). Sequence (2): The connection adapter 2, which has detected an incoming call from the telephone terminal on the calling side, rings the bell of the telephone 11 and calls (calls) the first slave station 20. Sequence (3): User B off-hooks the telephone set 11 and returns a response to the calling side telephone terminal (response 1). At this time, the user B is requested by the user A to call the user C carrying the second slave station 30. Sequence (4): User B controls the first slave station 20 by dialing the telephone 11 and sends a call signal to the second slave station 30 (call signal). Sequence (5): second slave station 30 that receives the calling signal
Sends a ringing tone and notifies the user C of the incoming call. User C goes to the first slave station 20 and picks up the handset 21 (response 2). Sequence (6): User C makes a call with user A (call).

The reason why the lower the data rate of the calling signal from the connection device 2 to the second slave station 30 is, the longer the reach distance will be described. First, it will be explained that in general, a lower data rate improves the signal-to-noise ratio (SNR). The detection output of the detection circuit 333 is y (t), and the detection circuit 3
When the component of the ringing signal in the detection output of 33 is d (t) and the noise component is n (t), the following equation holds.

[0038]

[Equation 1]

At this time, if the output of the integrating circuit for the n-th data is Z _n and T = 1 / DR, the following equation holds.

[0040]

[Equation 2]

Further, the signal component S and the noise component N are defined as follows.

[0042]

[Equation 3]

In the above equation, if the data rate DR is low,
Since one data period T becomes large, the second term squared N in the above equation
Becomes smaller. On the other hand, since the square S of the first term in the above equation does not change, the signal noise ratio SNR increases as the data rate decreases, as shown in the following equation.

[0044]

[Equation 4]

Therefore, the signal to noise ratio SNR increases in inverse proportion to the data rate.

Next, using the above relationship, it will be explained that the lower the data rate, the longer the radio wave reaches. Generally, when the square N of the second term of Expression 2 does not change, the signal noise ratio SNR is proportional to the received power Pr of the signal. Signal to noise ratio S
The relationship between NR and received power Pr is shown in FIG. Further, in free space, the received power Pr is inversely proportional to the square of the distance r between the transmitting and receiving antennas. FIG. 7 shows the relationship between the received power Pr and the distance r of the antenna.

A detailed description will be given below with reference to FIGS. 6 and 7. For example, in FIG. 6, a certain data rate DR
_It is assumed that the value of the signal-to-noise ratio is SNR ₀ when the value of the received power is ₀ and the value of Pr ₀ is Pr ₀ . Compared to this case, when the data rate DR becomes 1/2, the reception power Pr required to obtain the same signal noise ratio SNR may be 1/2.

Further, from FIG. 7, the distance at which the received power becomes 1/2 is √2 when the value of the data rate DR is DR _0.
Doubled. From the above, it was shown that in free space, the reach of radio signals (call signals) is inversely proportional to the square root of the data rate. Actual radio wave propagation is not inversely proportional to the square of the distance as in free space, but is inversely proportional to the third to fourth power. Also in this case, as in the case of the free space, the lower the data rate is, the larger the reaching distance of the radio signal is.

Therefore, since the data rate of the call signal is significantly lower than the data rate of the voice signal of the call, even if the call signal is transmitted with the same transmission power, the energy per bit of the call signal can be increased. Therefore, the signal-to-noise ratio of the calling signal is improved as compared with the voice signal in the cordless telephone, so that the reaching distance of the calling signal is increased and it is possible to call the second slave station 30 in a place where the call is impossible. is there. Therefore, it is possible to make a call in a range that greatly exceeds the callable range, and it is possible to reduce unnecessary labor and waste of time regarding the user's telephone transfer.

The second embodiment of the cordless telephone system of the present invention will be described below. FIG. 8 is a configuration diagram of the connection device 40 in the second embodiment. FIG. 9 is a block diagram of the slave station 30 in the second embodiment. Of the portions shown in FIGS. 8 and 9, the portions not described here are the same as the portions denoted by the same reference numerals in FIGS. 1 to 3 in the first embodiment. The cordless telephone system of the second embodiment comprises a connection device 40, a first slave station 20 and a second slave station 30 similar to those shown in FIG. 1 in the first embodiment. Second
The connection device 40 in the embodiment is composed of the line control device 12 and the transmission / reception circuit 13. The line control device 12 has a call control circuit 121 and an incoming call detection circuit 122. The transmission / reception circuit 13 has the same configuration as that shown in FIG. When the incoming call detection circuit 122 detects an incoming call from the wired communication line 10,
The call control circuit 121 performs processing such as setting a wireless line with the slave station 20, and the incoming call detection circuit 122 controls the call signal generation circuit 131 to perform a call operation to the slave station 30.

In FIG. 8, a call control circuit 121 is, for example, a control 1-chip microcomputer, a speech network circuit, a wired communication line 10, and a call circuit for setting a call path with the telephone 11 or the slave station 20. And the like, and controls the transmission / reception circuit 13 to change the transmission / reception frequency, and transmits / receives a control signal between the telephone 11 and the slave station 20 and the slave station 30 to perform control for wireless line setting,
In addition, it provides functions such as setting a communication path, 2-line to 4-line conversion, and controlling the entire connection device 40. Incoming call detection circuit 12
2 detects a ringer signal input to the connection device 40 from the wired communication line 10, detects an incoming call to the connection device 40, and calls control circuit 121 and call signal generation circuit 131.
To enter. In FIG. 9, each part of the slave station 30 is the same as that of the first embodiment shown in FIG.

The operation of the cordless telephone system in the second embodiment will be described below. In the case where there is no user (users (agents) B and D in the first embodiment) near the telephone 11 of the cordless telephone system in the second embodiment, and the agent B carries the child station 30. , The user A is a user C (first user) who is away from the slave station 20 from the telephone terminal connected to the connecting device 40 via the wired communication line 10.
Connection device 4 for communicating with the called party C) in the embodiment
Make a call to 0. An exchange (not shown) that connects the wired communication line 10 and the telephone terminal used by the user A sends a ringer signal to the connection device 40. The incoming call detection circuit 122 detects this ringer signal, and the call control circuit 12
1 and the incoming call detection circuit 122 are notified that there is an incoming call.

Upon receiving this notification, the call control circuit 121
The control signal transmission / reception processing similar to that of a general cordless telephone is performed with the slave station 20. At this time, the call control circuit 121
Generates a calling signal for the slave station 30, and the modulation circuit 13
Enter in 3. In the modulation circuit 133, the carrier signal is modulated by the call signal for the slave station 30 together with the control signal for the slave station 20, and the power amplifier circuit 1 is generated as a radio signal.
The slave station 20 and the slave station 3 via the antenna 34 and the antenna 14.
It is sent to 0.

The receiving circuit 33 of the slave station 20 which receives the radio wave signal controls the transmission circuit 31 to send out a ringing tone to the called party C. Hearing the ringing sound from this slave station 20,
The user C knows that the call has been made, and goes to the slave station 20 or the slave station 30 to make a call using the telephone 11 or the slave station 20. According to the cordless telephone system in the second embodiment, the user C can know the incoming call even if there is no person such as the users B and D in the first embodiment near the slave station 20. Therefore, the telephone number (slave station 20
There is an advantage that the user C can use this cordless telephone system even when there are no users B, C) in the vicinity of.

The operation of the cordless telephone system in the second embodiment will be described below with reference to FIG. Figure 10
FIG. 8 is a diagram showing a signal sequence of the cordless telephone system in the second embodiment. Sequences (1) to (4) in FIG. 10 correspond to the numbers given in the following description. Sequence (1): User A makes a call from the telephone terminal on the calling side to the connection device 40 via the wired communication line 10 (calling). Sequence (2): The connection adapter 2, which has detected an incoming call from the telephone terminal on the calling side, rings the bell of the telephone 11 and calls (calls) the slave station 20. Sequence (2 ′): While calling the slave station 20, the connection device 40 sends a calling signal to the slave station 30 (call signal). Sequence (3): The slave station 30 that has received the calling signal sends a ringing tone and notifies the user C of the incoming call (Response 2).
The user C goes to the slave station 20 and picks up the handset 21 (response). Sequence (4): User C makes a call with user A (call).

The third embodiment of the present invention will be described below. The cordless telephone system according to the third embodiment is configured so that the influence of noise or the like can be reduced by the spread spectrum communication system. The cordless telephone system of the third embodiment also includes the connection device 60 shown in FIG. 11, the slave station 20 adapted to the spread spectrum communication system, and the slave station 65 shown in FIG. FIG. 11 is a configuration diagram of the connection device 60 in the cordless telephone system of the present invention in the third embodiment. The connection device 60 includes a line control device 12 including a call control circuit 121 and an incoming call detection circuit 122, and the ringing signal generation circuit 13 shown as the second embodiment.
1, a spread spectrum circuit 61 and a PN generation circuit 62 are added in addition to the transmission / reception circuit 13 including the carrier wave generation circuit 132, the modulation circuit 133, and the power amplification circuit 134. FIG. 12 is a block diagram of a slave station 65 suitable for spread spectrum. The slave station 65 has a spectrum despreading circuit 66 and a PN generation circuit 67 in addition to the reception filter 331, the reception circuit 332, the detection circuit 333, the error detection circuit 334, and the calling signal detection circuit 335.

In FIG. 11, the spread spectrum circuit 6
1 spreads the spectrum of the voice signal, the control signal, and the calling signal input from the call control circuit 121 based on the PN series signal input from the PN generation circuit 62, and inputs them to the modulation circuit 133. In FIG. 12, the spectrum despreading circuit 66 includes an antenna 34 of the slave station 65,
Received by the receiving circuit 332 and the detecting circuit 333,
The detected signal is generated by the PN generation circuit 67 as P
The spectrum is inversely spread based on the N-series signal. In addition, in the third embodiment, the slave station 20 of the cordless telephone system has a spectrum despreading circuit and a PN generating circuit in the next stage of the detection circuit similarly to the slave station 65, and is configured to perform spectrum despreading. Has been done.

The operation of the cordless telephone system of the present invention in the third embodiment will be described below. When an incoming call is received from the telephone terminal via the wired communication line 10 to the connection device 60,
The incoming call detection circuit 122 notifies the call control circuit 121 and the call signal generation circuit 131 of the fact that there is an incoming call. The call control circuit 121 is a slave station 2 that performs spread spectrum processing.
A control signal transmitted / received to / from 0 is generated and input to the spread spectrum circuit 61. On the other hand, the calling signal generation circuit 13
1 generates a calling signal for the slave station 65 and inputs it to the spread spectrum circuit 61. The control signal and the calling signal are spread in the spread spectrum circuit 61 on the basis of the PN series digital format signal generated by the PN generation circuit 62, and transmitted through the modulation circuit 133, the power amplification circuit 134, and the antenna 14. It is sent as a signal.

This radio signal is received by the reception filter 3 of the slave station 65.
31, the receiving circuit 332, and the detection circuit 333 receive and detect the signal, and input the spectrum despreading circuit 66. The spectrum despreading circuit 66 uses the detection circuit 333.
The detected signal output from the PN generator circuit 67 is subjected to spectrum despreading based on the PN series digital signal generated by the PN generator circuit 67 and input to the error detection circuit 334. The error detection circuit 334 and the call signal detection circuit 335 detect the call signal. The ringing signal detection circuit 335 which has detected the ringing signal sends a ringing tone through the ringing signal generation circuit 311 and the transmission circuit 312 of the transmission circuit 31 to convey the incoming call to the user.

As described above, when the call is made by using the spread spectrum communication system, the following features are provided as compared with the cordless telephone system in the second embodiment. (1) The connection / reception device 60 and the modulation / demodulation circuit used for a call in the slave station 20 and the modulation / demodulation circuit used for calling the slave station 65 and the slave station 20 can be shared, the bandwidth can be shared, and the circuit can be rationalized. it can. (2) It is necessary to establish synchronization in advance in order to demodulate the signal on the wireless line between the connection device 60 and the slave station 20 and the slave station 65, but when the spread spectrum communication method is used, the ringing signal is reduced. In addition to transmitting at the data rate, modulation is performed with a high-speed PN series signal, so that synchronization can be established with this PN series signal. Therefore, the synchronization can be established at high speed, and the time until the call is shortened by the time when the synchronization is established quickly. (3) A signal based on the spread spectrum communication method has a low signal power per unit frequency, and therefore has good resistance to interference and resistance to radio wave signals. In addition, since the probability of interference with other wireless communication systems is reduced, the frequency can be effectively used and the reliability of communication is improved.

According to the cordless telephone system, the connecting device and the receiving device of the present invention shown in each of the above embodiments, the range in which the slave station can be called can be widened and the data rate of the calling signal can be lowered. Therefore, it is not necessary to increase the transmission power to widen the calling range for the slave station. Therefore, the performance of calling the slave station is improved as compared with the conventional cordless telephone system. In the calling operation of the other party, the restraint time and the amount of movement of the person who relays the call can be significantly reduced, or these can be eliminated. Further, when the spread spectrum communication system is adopted, it is possible to achieve reliability of communication and effective use of frequency, shortening of ringing time, and sharing of circuit. A simple message can be sent when the calling operation is performed from the connection device to the slave station.

Since the slave station dedicated to receiving the ringing signal is used,
It is possible to make the above call with a small, lightweight, low power consumption device. Therefore, it is possible to achieve a long battery life and easy portability. Also, since the slave station dedicated to receiving the ringing signal can be constructed in a very small size, it can be easily carried when going out a little,
In addition, it has the characteristic that it can be easily removed when it comes back, which makes it easy to attach and detach. By using the message transmission function, it is also possible to know the telephone number of the person who called when receiving a call. As described above, an excellent function can be provided by using a device having a simple structure.

In the third embodiment, similar to the second embodiment, the connecting device 60 automatically sends a call signal to the slave station 65 upon receipt of an incoming call, but the connection is made in the same manner as in the first embodiment. The call signal may be transmitted to the slave station 65 by operating the device 60 or the slave station 20. In each of the above embodiments, the modulation method is BPSK.
Modulation was adopted, but the methods of data modulation and spread spectrum modulation are, in addition to BPSK modulation, digital modulation circuits including phase modulation such as QPSK, and FSK and ASK by analog modulation such as FM modulation and AM modulation.
It is also possible to use. Further, in the third embodiment, the case where the spread spectrum circuit is arranged in the preceding stage of the modulation circuit is illustrated, but it is also possible to arrange it in the latter stage of the modulation circuit. The cordless telephone system, the connecting device, and the receiving device of the present invention can have various configurations in addition to those shown in the above-described embodiments, for example, as shown in the above-described modified examples.

FIG. 13 is a block diagram of a cordless telephone system according to the fourth embodiment of the present invention. This cordless telephone system includes a connection device 2 and a first slave station 2 having a transmission / reception function.
The configuration having 0, the telephone 11 is connected to the connection device 2, and the handset 21 is connected to the first slave station 20 is the same as in the above-described embodiment. That is, the slave station 20 is the same as that described above. Line control device 12 in the connection device 2
Is a dial function, a function of switching or connecting the telephone 11 and the transmitting / receiving circuit 23 in the slave station 20, or the transmitting / receiving device 42 in the second slave station 40, and connecting to the general subscriber telephone by the wired communication line 10. It has a function to do.
In this embodiment, the transmission means 25 is connected to the line controller 12 in the slave station 20. Further, the slave station 40 of the present embodiment has a configuration capable of transmission / reception, unlike the above-described second slave station 30 which does not have a transmission / reception function but has only a calling (transmission) function. That is, the second slave station 4
Reference numeral 0 has an antenna 41, a transmission / reception device 42, and a control device 43. To the control device 43, a transmission means 44 equivalent to the transmission circuit 31 is connected, and also a response means 45 is connected. That is, in the present embodiment, the incoming call can be transmitted in the connection device 2 via the transmission means 25, and the user can also make a response from the second slave station 40 via the response means 45.

As a result, this cordless telephone system differs from the above-mentioned cordless telephone system in the following points. (1) The communication functions of the connection device 2 and the first slave station 20 or the second slave station 40 include the following. (A) As a function described above, a function of identifying a signal from the connection device 2, setting a line, and making a call next (b) Setting a data rate of a calling signal to a remarkably low value for calling a slave station (C) Function of identifying response signal from slave station and transmitting it to agent (2) Second slave station 40 has the following functions. (D) Function of identifying and transmitting a call signal from the connection device 2, that is, when it is identified that the call is addressed to its own station, it possesses it by the transmission means 44 connected to the second slave station 40. Can be communicated to the person (user). (E) When the owner knows the call, the owner generates a response signal from the response instructing means 45 to the control device 43. The transmission / reception device 42 in the second slave station 40 modulates this and transmits it to the connection device 2. It should be noted that the second slave station 40 does not have a call line setting and a call function. The data rate of the response signal is set to a significantly lower value like the call signal in order to extend the reach.

First, the calling function will be described. The transmission device in the transmission / reception circuit 13 in the connection device 2 generates a call signal including the call name of the second slave station 40.
The transmitter in the transmitter / receiver circuit 13 modulates and amplifies this, and sends it out from the antenna 14. At this time, the data rate of the calling signal is set to a remarkably low value. This used to be
While the paging signal used a medium data rate of 600 bps to 2400 bps, the paging signal has a low information rate as described above in order to call the second slave station 40 in this method. This is because the time required for calling can be short even if it is sent by. That is, the information included in the call signal for calling the second slave station 40 is sufficient if the identifier of the second slave station 40 is present, and the amount of this information is very small. For example, it is about 50 bits, which is much smaller than the information of conversation in a conventional telephone. Since the amount of information is small, even if the bit rate (information rate) is reduced to, for example, several tens bps, the time required for transmitting the identifier is 1 to 2 seconds, and there is no problem that it takes too long. Also, even if a simple message is sent together with the identifier, there is no problem because the amount of information is small.

The second slave station 40 demodulates the calling signal obtained by modulating the low-rate signal, and the transmitting means 44 displays and conveys to the owner that the own station has been called. The holder of the second slave station 40 transmits the call to the own station by the transmission means 4
Know by 4. When the holder knows this, the response instructing means 45 responds, and the response signal is sent by the transmitting / receiving device 4
At 2, the signal is modulated into a low-rate response signal and transmitted to the connection device 2.

A method of using the cordless telephone system of this embodiment will be described. This cordless telephone system is used in the following sequence (procedure). (1) When a call is made from user A to user C, user B in the vicinity picks up the telephone. (2) User B uses the low rate function through line controller 12 to call user C
To send a signal to. The signal contains the identifier of the second slave station 40. When the second slave station 40 receives the signal including its own identifier, the user C informs that the user C has been called by the transmission means 44. User C
Uses the response function to send a message such as "go right away" or "call back after 5 minutes" (user)
Return to B. As a result, the user C can go to the place where the telephone 11 or the first handset 20 has the handset 21 and can talk with the user A. That is,
In the past, the caller A could not directly contact the caller C on the spot, but in the present embodiment, the caller C can be called so that the caller C can be surely contacted. Agent B
Also, a quick response can be made to the caller A.
Further, since the message can be sent directly to the caller A through the telephone line, the processing can be automatically performed even if the agent B is not present, which is convenient. As the response message, a fixed text can be prepared in advance, or a free text can be written on the spot.

In this configuration, the connection device 2, the first slave station 20, and the second slave station 40 can each be composed of a plurality of units. In addition, as described above, the first slave station 20
The second slave station 40 and the second slave station 40 can be combined into one slave station.

FIG. 14 is a more detailed block diagram of the connection device 2 and the second slave station 40 in the cordless telephone system shown in FIG. The connection device 2 includes a transmission / reception device 13 including a transmission device 13A and a reception device 13B, a call signal generation circuit 15 corresponding to the call signal generation circuit 131 described above, and a response signal detection circuit 16. The response signal detection circuit 16 is
The response signal is output to the transmission means 25. That is, in the present embodiment, since transmission and reception should be handled separately, the transmission / reception device 13 is divided into a transmission device 13A to which the calling signal generation circuit 15 is connected and a reception device 13B to which the response signal detection circuit 16 is connected. The distinction is illustrated. The transmission means 25 includes a low frequency oscillation circuit 251, a speaker 252, and an LCD display unit 2.
It has 53. The low frequency oscillating circuit 251 emits a low frequency signal for notifying that there is an incoming call from the speaker 252. The LCD display unit 253 visually displays that there is an incoming call. The transmitter / receiver 42 is also the transmitter 42
A and the receiving device 42B are illustrated separately. The control device 43 has a response signal detection circuit 431 equivalent to the response signal detection circuit 16 connected to the response instruction means 45, and a call signal generation circuit 432 equivalent to the call signal generation circuit 15. The response signal detection circuit 431 is connected to the transmitter 42A. The call signal generation circuit 432 is connected to the reception device 42B. The response indicating means 45 connected to the response signal detection circuit 431 is, for example, a response switch. The transmission means 44 connected to the call signal generation circuit 432 has substantially the same configuration as the transmission means 25, and includes the low frequency oscillation circuit 251, the speaker 252, and the LC.
Low-frequency oscillator circuits 44 corresponding to the D display sections 253, respectively.
1, a speaker 442, and an LCD display unit 443. Therefore, the transmission means 44 also has the same transmission function as the transmission means 25.

FIG. 15A is a circuit diagram of the transmitter 13A or the transmitter 42A. In this embodiment,
The circuit configurations of the transmitter 13A and the transmitter 42A are the same. FIG. 15B shows the receiving device 13B or the receiving device 4.
It is a circuit block diagram of 2B. In this embodiment, the receiving device 13B and the receiving device 42B have the same circuit configuration.
As an example of the transmitter 13A, the transmitter 13A is
Two-phase phase shift keying (BPSK) modulation circuit 15
1, a carrier wave generator 152, an amplifier circuit 153, and a bandpass filter 154. Taking the receiver 13B as an example, the receiver 13B includes a bandpass filter 141 and an amplifier circuit 14.
2. It has a detection circuit 143 and an integration circuit 144.

The operation will be described with reference to FIGS. 14 and 15.
When the agent B drives the call signal generation circuit 15, the speaker 442 in the transmission means 44 connected to the second slave station 40 sounds in the following procedure (sequence), and the caller C knows the call. (1) In the connection device 2, the call signal generation circuit 15 is driven to generate call signal data for the transmitter 13A. Here, the calling signal is a binary data string. A BPSK wave is generated by the BPSK modulation circuit 151 and the carrier wave generator 152 in the transmitter 13A. The amplification circuit 133 is the BPSK generated by the BPSK modulation circuit 151.
The wave is amplified to a necessary power, the unnecessary frequency component is suppressed by the bandpass filter 154, and the wave is radiated from the antenna 14. (2) In the second slave station 40 on the receiving side, the high frequency signal transmitted from the antenna 14 is received via the antenna 41, and the bandpass filter 431 in the receiving device 42B selects a desired wavelength component and amplifies it. After amplification to the required level in the circuit 432, the detection circuit 433 extracts the necessary data sent from the calling signal generation circuit 15. Further, the integrating circuit 434 integrates the data over one data period to improve the signal-to-noise ratio (SNR). However, one data cycle, which is the integration interval,
When the data rate differs between when calling and when calling, the integration interval (or the time constant of the integrating circuit) is automatically switched according to the type of data to be transmitted. The type of data to be transmitted is switched to call data during standby and call data during a call, for example. By the call signal generation circuit 432 in the control device 43, the integration circuit 4
It is detected whether or not the data string obtained at 34 is a call to the own station, and if it is a call to the own station, the transmitting means 44
A call is displayed on the LCD display section 443 therein, or the low frequency oscillation circuit 441 is driven to cause the speaker 442 to ring.

On the other hand, the caller C drives the response instructing means 45 and outputs a response instructing signal to the response signal detecting circuit 431, whereby the speaker 252 in the transmitting means 25 connected to the connecting device 2 is followed in the following procedure. Sounds, and agent B talks to party C
You can know the response or the content of the response. (A) In the second slave station 40 on the transmission side, (A1) In response to the signal from the response instructing means 45, the response signal detection circuit 431 generates the data of the response signal to the transmitter 42A. Here, the response signal is a binary data string. (A2) A BPSK wave is generated by the BPSK modulation circuit 421 and the carrier wave oscillation circuit 422 in the transmitter 42A. The amplification circuit 423 amplifies the BPSK wave generated by the BPSK modulation circuit 421 to the required power, suppresses the unnecessary frequency component by the bandpass filter 424, and radiates it from the antenna 41 toward the antenna 14. (B) In the connection device 2 on the receiving side, (B1) The high-frequency signal transmitted from the antenna 41 is received by the antenna 14, the desired wave is selected by the bandpass filter 141 in the reception device 13B, and necessary in the amplifier circuit 142. After being amplified to various levels, the detection circuit 143 extracts the data, and the integration circuit 144 integrates the data over one data cycle to improve the signal-to-noise ratio. (B2) The response signal detection circuit 16 in the line control device 12 detects whether or not the data string obtained by the integration circuit 144 is a call to the own station, and if it is a call to the own station, the transmission means 25 A call is displayed on the LCD display unit 253 therein, or the low frequency oscillation circuit 251 is driven to cause the speaker 252 to ring. After that, the caller C uses the connection device 2
You can talk to the party A using the telephone 11 by going to a certain place. Or, the caller C uses the first slave station 2
You can go to location 0 and talk to party A using handset 21. In this case, the connection device 2 connects the voice signal of the telephone and the input / output signal of the transmission / reception circuit 23 (wireless equipment) in the first slave station 20. Transmission device 1 of connection device 2
The input signal of the 3A BPSK modulation circuit 151 is switched from the calling signal to the voice signal and modulated. In this case, the audio signal may be an analog or a digitized signal. In the transmission means 25 or the transmission means 44, in addition to the display by the LCD display units 253 and 443 and the sounds from the speakers 252 and 442, for example, a light emitting diode is made to blink.

It has been described above that the lower the data rate, the greater the reach distance. Also in this embodiment, since the data rate is low, the energy per bit can be increased even if transmission is performed with the same transmission power as the conventional one. As a result, the signal-to-noise characteristics are improved compared to conventional cordless telephone systems. Then, the reaching distance is extended.

A cordless telephone system according to the fifth embodiment of the present invention will be described with reference to FIG. This cordless telephone system includes a connection device 2 and a second slave station 40. That is, this cordless telephone system is shown in FIG.
From the cordless telephone system shown in FIG.
Has been deleted. In this embodiment, the function as a telephone is left to the connection device 2, and the second slave station 40
Has a call-only function. Therefore, the connection device 2 and the second slave station 40 do not talk.

A cordless telephone system according to the sixth embodiment of the present invention will be described with reference to FIG. This cordless telephone system is different from the cordless telephone system illustrated in FIG. 16 in that automatic response means 46 is provided between a transmission means 44 and a response instruction means 45. Caller C
It is assumed that the response instructing means 45 connected to the second slave station 40 cannot be used because, for example, cannot be released. Caller C
Determines the response message in advance and turns on the automatic response means 46. Call from agent B,
When the call signal generation circuit 432 in the control device 43 detects and instructs the transmission means 44, the transmission means 44 drives the automatic response means 46. The automatic response means 46 is the response instruction means 4
5 is driven to output a response signal to the response signal detection circuit 431 in a starting manner. As a result, the agent B can know the automatic response. According to this configuration, the caller C can return a response to the agent B without operating the response switch in the response instructing means 45. The caller C does not have to give a response instruction. That is, the second slave station 40 has a feature of automatically returning a response to a call.

Although the first slave station 20 is omitted in FIG. 17, when the first slave station 20 is provided, the first slave station 20 shown in FIG.
The first slave station 20 illustrated in FIG. 2 is provided to make a call in the same manner as that used in the conventional system. If the first slave station 20 is not provided, the call is made only by the connection device.

Further, it may be a slave station in which the first slave station 20 and the second slave station 40 are combined. In this case, you can make a call once you enter the service area. Only the calling function operates outside the service area.

A cordless telephone system according to the seventh embodiment of the present invention will be described with reference to FIG. This cordless telephone system has a connection device 2 and a second slave station 40. In this cordless telephone system, the response is automatically transferred to the caller A. Therefore, the connection device 2 is provided with an incoming call detection circuit 27 and a response transfer means 28. It is assumed that the called party C has the second slave station 40, and neither the agent B nor the party D is near the telephone 11. The incoming call detection circuit 27 detects an incoming call from the caller A, and
A signal is given to the calling signal generating circuit 15 illustrated in FIG.
As a result, the called party C can know the call by the procedure shown in the fourth embodiment. According to this configuration, the calling party A can know the content of the response message from the called party C without the agents B and D, so that the calling party automatically answers even when there is no telephone number. There is an advantage that the call can be transferred to the calling party A.

FIG. 19 shows the eighth embodiment of the present invention.
With reference to (A) and (B), a transmitter using spread spectrum and a receiver using reverse spread spectrum will be described. The transmitter illustrated in FIG. 19A can be applied to the above-described fourth to seventh embodiments. Similarly, FIG.
The receiver illustrated in (B) is the above-described fourth to seventh embodiments.
It can be applied to the embodiment. The basic principle of transmission using spread spectrum and reception using despreading is as shown in FIG. 11 and FIG.
This is similar to the embodiment described with reference to FIG. The transmitter is
A two-phase phase shift keying (BPSK) modulation circuit 151, a carrier wave generator 152, an amplification circuit 153, and a bandpass filter 154, which are similar to those of the transmission device 13A (42A) illustrated in FIG. It has a spectrum spread circuit 61 and a PN generation circuit 62 similar to those described above.
The receiving device is the receiving device 13B illustrated in FIG.
Band filter 141 and amplifier circuit 1 similar to (42B)
42 between the detection circuit 143 and the integration circuit 144, a spectrum despreading circuit 66 similar to that illustrated in FIG.
And a PN generation circuit 67. That is, FIG.
The transmission device illustrated in (A) is substantially the same as the transmission device illustrated in FIG. 11, and the reception device illustrated in FIG. 19B is substantially the same as the reception device illustrated in FIG.
The spread spectrum circuit 61 performs spread spectrum using the signal from the voice signal or the calling signal generation and the PN signal of the PN generation circuit 62. By using this signal and the carrier signal of the carrier transmission circuit 152, the BPSK modulation circuit 151
To perform BPSK modulation. This BPSK wave is an amplification circuit 15
The signal is amplified by 3 and passes through the bandpass filter 154 and is radiated from the antenna 14. In the second slave station 40, the antenna 4
The band filter 141 selects a desired frequency from the signal received at 1, and the amplification circuit 142 amplifies it to a required level. This signal is despread by the spectrum despreading circuit 66 using the PN signal of the PN generating circuit 67. From the spectrum despread signal, the detection circuit 143 and the integration circuit 14
The call signal is demodulated by 4. For example, when the call signal generation circuit 432 in the control device 43 of the second slave station 40 illustrated in FIG. 14 detects that this signal is a call signal addressed to itself, the speaker 44 in the transmission means 44.
2 and the speaker 442, or the LCD display unit 4
43, the called party C can know the incoming call.

The spread spectrum has the following advantages over the simple two-phase phase shift keying (BPSK) modulation. (1) The modulation / demodulation circuit used for a call between the connection device 2 and the first slave station 20 and the modulation / demodulation circuit used for calling the slave station 2 can be shared, the bandwidth can be shared, and the circuit can be rationalized. (2) It is necessary to capture the synchronization in advance for demodulation, but in the case of spread spectrum, since the modulation is performed with a high-speed PN signal in addition to low-rate data, the synchronization is obtained with this PN signal. Just capture it. As a result, it becomes possible to capture synchronization at high speed. Therefore, the time until ringing is shortened by the time when the synchronous capture becomes faster. (3) The spread spectrum signal has a low signal power per unit frequency, so that the signal has good interference resistance and interference resistance. There is an advantage that the utilization and communication reliability are increased. In addition, the probability of interfering with other wireless communication systems is reduced, and thus the compatibility with other systems (for example, an analog cordless telephone system) is good.

In the present invention, BPSK is used as the modulation method.
Although the explanation has been given by taking the modulation as an example, the data modulation and spread spectrum modulation methods include digital modulation circuits including phase modulation such as QPSK, analog modulation such as FM modulation and AM modulation, in addition to BPSK modulation. It is also possible to use FSK and ASK by modulation. Further, the spread spectrum circuit 61 has a BPS
The modulation circuit 1 is arranged before the K modulation circuit 131.
It is also possible to arrange it at the latter stage of 31.

As described above in detail, according to the present invention, (1) the calling signal and the response signal have a reduced data rate, and therefore the conventional cordless telephone system can be reached without increasing the transmission power. It is clear that it can reach far distances compared to distances. That is, it is possible to provide a system exhibiting higher performance than ever before. (2) In the call operation, the restraint time of the person who intervenes the call and the amount of movement can be greatly reduced. Or eliminate these. (3) If a spread spectrum signal is adopted,
Communication reliability and effective use of frequency, shortening of ringing time,
Common circuits can be achieved. (4) A simple message can be sent when a call operation is performed from the connection device to the second slave station 40. Also, a simple message can be sent from the slave station 2 to the connection device. Therefore, if you have a simple conversation such as answering "yes" or "no", you can exchange messages without talking, so you do not have to go to the telephone line and do not talk. The communication time can be shortened. (5) By using the message transmission function, it is possible to know the telephone number of the person who called when receiving a call. Further, the device configuration can be simplified by sharing the circuit. In particular, by providing the response instruction means, the called party can effectively respond to the calling party.

[0084]

As described above, according to the cordless telephone system, the connecting device and the receiving device of the present invention, it is possible to call a user who is outside the range where communication is possible. Further, it is possible to reduce unnecessary labor and waste of time when the agent searches for the other party of the call or calls out loud at the time of the telephone transfer. Further, by applying the spread spectrum communication method to a cordless telephone, it is possible to provide a cordless telephone system, a connection device, and a receiving device that are capable of communicating over a longer distance and are resistant to interference.

Further, according to the present invention, by providing the response instruction means in addition to the calling (transmitting) means to the slave station which does not have the transmission / reception function, the caller can be executed without intervening the agent. Can respond to. This response can also be an automatic response to the call.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a cordless telephone system according to a first embodiment of the present invention.

FIG. 2 is a configuration diagram of the connection device shown in FIG.

FIG. 3 is a configuration diagram of a slave station 30 shown in FIG.

FIG. 4 is a configuration diagram when a sharable circuit is shared and a second slave station 30 is incorporated in the first slave station 20.

FIG. 5 is a diagram showing a signal sequence of the cordless telephone system of the present invention.

FIG. 6 is a diagram showing a relationship between a signal noise ratio SNR and received power Pr.

FIG. 7 is a diagram showing a relationship between a reception power Pr and an antenna distance r.

FIG. 8 is a configuration diagram of a connection device of a cordless telephone system according to a second embodiment of the present invention.

FIG. 9 is a configuration diagram of a second slave station of the cordless telephone system of the present invention in the second embodiment.

FIG. 10 is a diagram showing a signal sequence of the cordless telephone system in the second embodiment.

FIG. 11 is a configuration diagram of a connection device in the cordless telephone system of the present invention in the third embodiment.

FIG. 12 is a configuration diagram of a child station 65 in the cordless telephone system of the present invention in the third embodiment.

FIG. 13 is a configuration diagram of a cordless telephone system according to a fourth embodiment of the present invention.

FIG. 14 is a configuration diagram of the connection device and the second slave station shown in FIG.

15A is a configuration diagram of the transmission device in FIG. 13, and FIG. 15B is a configuration diagram of the reception device in FIG.

FIG. 16 is a configuration diagram of a cordless telephone system according to a fifth embodiment of the present invention.

FIG. 17 is a configuration diagram of a cordless telephone system according to a sixth embodiment of the present invention.

FIG. 18 is a configuration diagram of a cordless telephone system according to a seventh embodiment of the present invention.

FIG. 19 (A) is a block diagram of a spread spectrum transmitter applied to this embodiment, and FIG. 19 (B) is a block diagram of a spread spectrum spread receiver applied to this embodiment. is there.

FIG. 20 is a diagram showing a configuration example of a conventional cordless telephone system.

FIG. 21 is a diagram showing a schematic positional relationship among a plurality of users when intermediating a telephone call when using a general wired telephone.

22 is a diagram for explaining the operation of each user shown in FIG.

[Explanation of symbols]

2 ・ ・ Connecting device 10 ・ ・ Wired communication line 11 ・ ・ Phone 12 ・ ・ Line control device 121 ・ ・ Call control circuit 122 ・ ・ Incoming call detection circuit 13 ・ ・ Transmission / reception circuit 131 ・ ・ Call signal generation circuit 132 ・ ・ Carrier wave Generator circuit 133 Modulator circuit 134 Power amplifier circuit 13A (42A) Transmitter device 151 Two-phase phase shift keying (BPSK) modulator circuit 152 Carrier generator 153 Amplifier circuit 154 Band filter 13B..Reception device 141..Band filter 142..Amplification circuit 143..Detection circuit 144..Integration circuit 14..Antenna 15..Ring signal generation circuit 16..Response signal detection circuit 20..Transmission / reception function Owned first slave station 21 .. Handset 22 .. Slave station control device 23 .. Transceiver circuit (transceiver device) 24. Antenna 25. Transmission means 27..Incoming call detection circuit 28..Response transfer means 30..Second slave station not having a transmitting / receiving function but having a calling function 31..Transmission circuit 311..calling signal generating circuit 312..Speaker 313..Low frequency amplification circuit 33..Reception circuit (reception device) 331..Reception filter 332..Reception circuit 333..Detection circuit 334..Error detection circuit 335..Call signal detection circuit 34..Antenna 40 ..・ Second slave station 41 ・ ・ Antenna 42 ・ ・ Transceiver 43 ・ ・ Control device 44 ・ ・ Transmission means 45 ・ ・ Response means 46 ・ ・ Automatic response means 60 ・ ・ Connecting device 61 ・ ・ Spread spectrum circuit 62 ・ ・PN generation circuit 65 ··· Slave station 66 ·· Spectrum despreading circuit 67 ··· PN generation circuit

Claims (22)

[Claims] 1. A connection means and a reception means that are wirelessly connected to each other, wherein the connection means includes an identification code unique to the reception means in response to a predetermined call request to the reception means. A call signal sending means for sending a call signal as a radio wave signal at a lower data rate than the call control signal, the receiving means being included in the call signal having a lower data rate than the received call control signal. A cordless telephone system having notifying means for notifying an incoming call by identifying that the received identifying code is a unique identifying code for the receiving means. 2. The method further comprising: a call means for transmitting and receiving a voice signal to and from the connecting means by radio; and a voice transmitting and receiving means connected to the connecting means for transmitting and receiving a voice signal to and from the call means by radio. Cordless telephone system described in. 3. The cordless telephone system according to claim 2, wherein the receiving means and the call means are integrally formed. 4. The cordless telephone system according to claim 2, wherein said voice call means further comprises notifying means for notifying an incoming call. 5. The connection means is connected to a wired communication line connected to a telephone network, detects an incoming call from the wired communication line, and when the incoming call from the wired communication line is detected, the calling is performed. The cordless telephone system according to any one of claims 1 to 4, further comprising incoming call detection means for causing the signal transmission means to transmit the ringing signal. 6. The connection means further comprises operation information input means for inputting operation information, and the calling signal sending means is connected to the calling signal sending means in accordance with operation information input from the operation information input device. The cordless telephone system according to claim 1, wherein the call signal is transmitted. 7. The connecting means further comprises a spread spectrum means for spectrum spreading the calling signal and inputting the calling signal after spread spectrum to the calling signal transmitting means, the receiving means or the voice transmitting / receiving means. 3. The spectrum despreading means for despreading the received call signal and inputting it to the notifying means.
The cordless telephone system according to any one of 1 to 6. 8. A device for calling a receiving device having a unique calling code, and a calling signal generating means for generating a calling signal including an identification code unique to the receiving device in response to a predetermined calling request. And a calling signal sending means for sending the calling signal to the receiving means as a radio signal having a data rate lower than that of the call control signal. 9. The connection device according to claim 8, further comprising a spread spectrum unit that spreads the ringing signal output from the ringing signal generating unit and inputs the spread spectrum signal to the ringing signal transmitting unit. 10. A ringing signal receiving means that receives a ringing signal transmitted as a radio wave signal, including an identification code unique to the receiving device, and having a lower data rate than the call control signal, and the ringing signal included in the received ringing signal. A receiving device having an incoming call notifying means for detecting an identification code unique to the receiving device and notifying an incoming call when the identification code is detected. 11. The call signal is a spectrum-spread signal, and has a spectrum despreading means for despreading the call signal output from the call signal receiving means and inputting it to the incoming call notifying means. Item 10. The receiving device according to item 10. 12. A connection device functioning as a master unit, and at least two first slave stations and second slave stations functioning as slave units are wirelessly connected, and the first slave station is a handset. A transmitter / receiver for communicating between the handset and the connection device, wherein the second slave station includes at least a reception device for receiving an incoming call from the connection device and a transmission means for notifying the reception signal. The connecting device attaches an identification code to a call signal corresponding to a call from the outside at a data rate lower than that of a call control signal, and transmits the call signal to the transmitter / receiver means of the first slave station and the second slave station. Means for notifying, and means for establishing a communication path between the outside and the transmitter / receiver means in response to the first transmitter / receiver means; Cordless telephone having means for producing voice in response to a data rate signal system. 13. The connection device comprises a telephone, and the communication path establishing means in the connection device establishes a communication path between the telephone and the transmitting / receiving means of the first slave station. Item 12. The cordless telephone system according to item 12. 14. The connecting device has a transmitting means corresponding to the transmitting means of the second slave station, and the notifying means of the connecting device outputs the calling signal to the transmitting means as well. Or the cordless telephone system according to 13 above. 15. The cordless device according to claim 12, wherein the connection device has a device for calling the transmission / reception device of the first slave station in response to the notification from the transmission device of the connection device. Telephone system. 16. The second slave station further includes a transmitter and response instructing means, and in response to the transmitting means of the second slave station, the response instruction of the response instructing means is transmitted to the connection device. The cordless telephone system according to claim 15, which is notified. 17. An automatic response means is provided between the response instruction means of the second slave station and the transmission means of the second slave station.
17. The cordless telephone system according to claim 16, wherein the response instruction means automatically notifies the connection device of a response instruction in response to the operation of the transmission means of the second slave station. 18. A connection device that functions as a master device and a slave station that functions as a slave device are wirelessly connected, and the slave station includes at least a reception device that receives an incoming call from the connection device and the reception signal. And a means for notifying the mobile station by attaching an identification code at a data rate lower than the call control signal to the call signal corresponding to the call from the telephone, and A cordless telephone system comprising: a means for establishing a communication path between the telephone and the outside; and a transmitting means of the second slave station having a means for emitting a voice in response to the low data rate signal. 19. The cordless according to claim 18, wherein the connection device has a transmission means corresponding to the transmission means of the slave station, and the notification means of the connection device outputs the calling signal to the transmission means. Telephone system. 20. The slave station further includes a transmission device and a response instruction unit, and the response instruction of the response instruction unit is notified to the connection device in response to the transmission unit of the slave station. Cordless telephone system described. 21. Automatic response means is provided between the response instruction means of the slave station and the transmission means of the slave station, and the response instruction means automatically responds to the operation of the transmission means of the slave station. 21. The cordless telephone system according to claim 20, wherein a response instruction is sent to the connection device. 22. The cordless telephone system according to claim 12, wherein communication between the connection device and the first and second slave stations is performed using spread spectrum communication.