JP2718099B2 - Cordless telephone - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The description will be made in the following order.

A Industrial Field of Use B Summary of the Invention C Prior Art D Problems to be Solved by the Invention E Means for Solving the Problems F Action G Example H Effects of the Invention A Field of Industrial Use This invention is a cordless telephone. About.

B. Summary of the Invention The present invention provides a multi-cordless telephone combining a base station connectable to a plurality of telephone lines and a plurality of handsets, by setting which handsets can use which telephone lines. This is an improvement in convenience as a telephone.

C Conventional Technology A low power type cordless telephone is based on the MCA system, and has 87 communication channels and 2 control channels.

Therefore, as an extension of the function of such a cordless telephone, a so-called multi-cordless telephone has been considered in which a plurality of child devices can be used in combination with one parent device.

D Problems to be Solved by the Invention First, an example of a multi-cordless telephone will be described. However, in this example, there are two external lines and up to eight slave units, and only one control channel is used.

In FIG. 2, (1A) to (1H) show first to eighth handsets (slaves). These handsets (1A)
Since (1H) has the same configuration, and will be described as a representative with the handset (1A), (110) is a transmitting circuit, and (120) is a receiving circuit. Then, the transmission circuit (11
0) converts the voice signal St and the command signal CMND (to be described in detail later) into an upstream channel FM signal Su and transmits the signal. The receiving circuit (120) receives the downstream channel FM signal Sd and It demodulates the audio signal Sr and the command signal CMND.

In addition, (131) is a dial key, (132) is a talk key, and the talk key (132) is a non-lock type push switch. Each time the key (132) is pressed, the handset (1A) is set to the standby mode. And the talk mode is alternately switched. In addition, handset (1A)
Is in the standby mode, the receiving circuit (120) is in a reception standby state on the downstream control channel.

Further, (133) to (137) are auxiliary keys such as extension keys constituted by non-lock type push switches, (139) is a ringer speaker, and (140) is a microcomputer for system control. In the microcomputer (140), the command signal CMND transmitted by the transmission circuit (110) is formed, and the command signal CMN extracted from the reception circuit (120) is formed.
D is determined. Further, in the microcomputer (140), control signals TCTL and RCTL for controlling transmission / reception permission / inhibition of the transmission circuit (110) and a channel on which the transmission circuit (110) and the reception circuit (120) perform transmission / reception are also formed.

A RAM (141) stores a 25-bit system identification code SYID for distinguishing the multi-cordless telephone from other cordless telephones. Furthermore, handset (1A)-(1H)
Are assigned handset numbers of "1" to "8" in order to identify these handsets (1A) to (1H) from each other (the assignment order is arbitrary), and the handset number of which handset number is 4 bits is assigned. Identifying code
It is stored in the RAM (141) as the HSID. When the identification code (handset number) HSID is "0", all handsets (1A) to (1H) correspond.

(2) is the base station (master), (3)
A) and (3B) indicate telephone lines (external lines). In the base station (2), (21A) to (21C) indicate base units, and these base units (21A) to (21A)
(21C) is a transmission circuit (21) similar to the transmission circuit (110) and the reception circuit (120) in the handsets (1A) to (1H).
0) and a receiving circuit (220). The receiving circuits (220) to (2) of these base units (21A) to (21C)
20) is also waiting on the upstream control channel when not talking.

Furthermore, in the base station (2), (22)
Is a call switch circuit, (23A) and (23B) are external line interface circuits, and (24) is a microcomputer for master control. In this case, the switch circuit (22)
Is based on the base unit (21A)
(21C) and between the base units (21A) to (21C) and the interface circuits (23A) and (23B). In addition, the interface circuit (23A),
(23B) is a 4-wire / 2-wire conversion circuit (231), a switch circuit corresponding to a hook switch of a general telephone (232), a dial toll signal (DTMF signal) forming circuit (233), and detection of a ring tone signal A circuit (234).

In addition, the microcomputer (24) has a handset (1A)
In addition to performing the same processing as the microcomputer (140) in (1H), the handset (1A) to (1H), the communication channel, the base unit (21A) to (21C), the line (3A),
It manages the overall operation of this cordless telephone such as the usage status of (3B). And (241) is ROM
In this ROM (241), a system identification code SYID is written.

FIG. 3 shows an example of a signal format of the command signal CMND. The signal CMND has a 24-bit bit synchronizing signal BSYN at the beginning, followed by a 16-bit frame synchronizing signal.
Has FSYN. In this case, these signals BSYN and FSYN are, for example, BSYN = “101010 ‥‥‥‥‥‥ 10” FSYN = “1100010011010110” ‥‥ for the up channel FSYN = “1001001100110110” Has a pattern.

Further, the command signal CMND has a 25-bit system identification code SYID following the signal FSYN, and a 12-bit error correction code ECC for the code SYID in order, and a 5-byte control code following the code ECC. Has CTRL.

In this case, the control code CTRL is the first byte CTL1
Is a code indicating the control contents of the handsets (1A) to (1H) and the base station (2).
L2 to the fifth byte CTL5 are parameters or data related to the first byte CTL1. For example, if the base station (2) informs any of the handsets (1A) to (1H) of the channel number of the call channel, CTL1: a code indicating that the call channel is notified CTL2: the other handset Handset identification code HSID CTL3: Channel number of the communication channel CTL4, CTL5: Dummy. In most cases, the second byte CTL2 is
The handset identification code HSID as described above.

When the handset (1A) to (1H) or the base unit (21A) to (21C) receives the command signal CMND, the microcomputer (140) or (24) uses the identification code SYID included in the signal CMND. (as well as
HSID) is checked to see if it matches the identification code SYID (and HSID) stored in its own RAM (141) or ROM (241). Only when it matches, the command signal CMND is validated and the If not, it is invalid.

Then, calling from the handsets (1A) to (1H) is performed as follows.

That is, for example, when the handset (1A) is in the standby mode and the talk key (132) is pressed, this is detected by the microcomputer (140) and the microcomputer (140)
Supplies a transmission control signal TCTL to the transmission circuit (110),
As a result, the transmission circuit (110) is allowed to transmit on the up control channel, and the control code (CTRL) is transmitted to the microcomputer (140) by the command signal CMND indicating the call request and the handset identification code HSID.
Is formed, and this signal CMND is supplied to the transmission circuit (110).

Therefore, in the transmission circuit (110), the signal CMND is the FM signal (FSK signal) Su of the uplink control channel.
And the signal Su is transmitted to the base station (2) via the antenna (100).

Then, in the base station (2), the signal (radio wave) Su is received by the antenna (200), and the received signal Su is transmitted to the base units (21A) to (21C).
Supplied to In this case, for example, if the base unit (21A) is vacant,
Since the receiving circuit (220) of A) is in the receiving state of the uplink control channel, the command signal CMND is demodulated from the FM signal Su in the receiving circuit (220),
The CMND is supplied to the microcomputer (24), and it is checked whether the identification code SYID included in the signal CMND matches the identification code SYID of the ROM (241). Then, in this case, the transmission control circuit TCTL is supplied from the microcomputer (24) to the transmission circuit (210) because the transmission and the request are the same from the handset (1A). Transmission on the control channel is permitted, and the control code CTRL
However, a command signal CMND indicating the permission of calling, the handset identification code HSID and the channel number of the communication channel is formed and supplied to the transmission circuit (210).

Therefore, in the transmission circuit (210) of the base circuit (21A), the signal CMND changes to the FM of the downlink control channel.
It is converted to a signal Sd, and this signal Sd is transmitted to the handsets (1A) to (1H) through the antenna (200).

Then, in the handset (1A), when the FM signal Sd is transmitted through the downlink control channel from the base station (2), the FM signal Sd is received by the antenna (100) and supplied to the receiving circuit (120),
The command signal CMND is extracted from the receiving circuit (120) and supplied to the microcomputer (140).

Then, the identification code included in the command signal CMND
SYID, HSID is the identification code S stored in the RAM (141).
Since they match YID and HSID, the transmission circuit (110) and the reception circuit (120) are set to the communication channel of the channel number indicated by the control signal CTRL in the received command signal CMND by the control signals TCTL and RCTL. , Reception is also permitted.

In the base unit (21A), when the communication channel is instructed to the handset (1A) by the command signal CMND, the microcomputer (24) subsequently sends the transmission circuit (21A).
0) and the transmission control signal TCTL and the reception control signal RCTL are supplied to the reception circuit (220), and the transmission circuit (210) and the reception circuit (220) transmit the channel number designated by the microcomputer (24) to the handset (1A). Transmission and reception are allowed on the call channel.

Therefore, a communication channel has been opened between the handset (1A) and the base unit (21A).

At this time, the remaining handsets (1B) to (1H) also receive the FM signal Sd transmitted from the base station (2), but the transmitted handset identification code HSID is different from the own handset. Since they match, the reception standby state (standby mode) in the downstream control channel is maintained.

Further, in the base station (2), a vacant interface circuit is selected from the interface circuits (23A) and (23B). In the case of the figure, the interface circuit (23A) is selected and its switch circuit (232) is selected. While being turned on (off-hook state), the switch circuit (22) is controlled, and the transmission circuit (210) and the reception circuit (220) of the base unit (21A) are converted into the interface circuit (23A) through the switch circuit (22). Circuit (231)
Connected to.

Therefore, in this case, the base unit (21A)
Switch circuit (22) and interface circuit (23A)
The handset (1A) is connected to the line (3A) through the circuits (21A), (22), and (23A).

Then, when the caller inputs the telephone number of the other party using the dial key (131) of the handset (1A), a control signal CTRL indicates that the telephone number is to be transmitted and a command signal CMND indicating the telephone number is formed. This signal CMND is
The base station (2) converts the signal into the FM signal Su of the specified communication channel and transmits the signal.

Therefore, in the base station (2),
The command signal CMND is obtained from the receiving circuit (220) of the base unit (21A). Since the control code CTRL of the signal CMND indicates the transmission of the telephone number and indicates the telephone number, the forming circuit ( 233) Microcomputer (24)
Is controlled according to the telephone number to form a dial tone signal corresponding to the telephone number sent from the handset (1A), and this signal is converted by the conversion circuit (231).
To the telephone line (3A) through the switch circuit (232).

Then, when the other party answers the telephone, an audio signal Sr from the other party is transmitted to the base unit (21A) through the signal line of the line (3A) → the switch circuit (232) → the conversion circuit (231) → the switch circuit (22). It is supplied to a transmission circuit (210).
Therefore, the signal Sr is the FM signal of the downlink communication channel.
The signal is converted to Sd, and this signal Sd is transmitted from the antenna (200).

Then, the signal Sd is received by the handset (1A), an audio signal Sr is extracted from the receiving circuit (120), and the signal Sr is supplied to the receiver (121).

At the time of transmission, the audio signal St from the transmitter (111) is transmitted.
Is supplied to the transmitting circuit (110) and is converted into an FM signal Su of the uplink communication channel, and this signal Su is transmitted to the antenna (100).
To the base station (2).

Then, in the base station (2), the signal Su is received by the base unit (21A), and a signal St is extracted from the receiving circuit (220). This signal St is converted into a switch circuit (22) → an interface circuit (23A). Is supplied to the line (3A) through the signal line of the conversion circuit (231) → switch circuit (232) and sent out to the other party's telephone.

 Calling and talking are performed as described above.

When the talk key (132) of the handset (1A) is pressed at the end of the call, a command signal CMND indicating that the control code CTRL is the end of the call and the handset identification code HSID is formed. The FM signal Su of the channel is transmitted to the base station (2).

Then, the command signal CMND is extracted from the receiving circuit (220) of the base unit (21), and the microcomputer (24) determines that the call has ended. As a result, the transmission of the transmission circuit (210) of the base unit (21A) is controlled by the control signal TC.
In addition to being inhibited by the TL, the receiving circuit (220) is placed in a standby state for receiving an uplink control channel by the control signal RCTL. The interface circuit (23A)
Switch circuit (232) is also turned off (on-hook state).

Further, also in the handset (1A), after transmitting the command signal CMND indicating the end of the call, the transmission circuit (110) prohibits the transmission by the control signal TCTL, and the reception circuit (12)
0) is set to the reception standby state of the downstream control channel by the control signal RCTL.

Thus, the handset (1A) and the base unit (21
A) and the interface circuit (23A) are in the standby mode.

On the other hand, incoming calls to the handsets (1A) to (1H) are performed as follows.

That is, for example, when a call is received via the line (3A), the ring tone signal is detected by the detection circuit (234) of the interface circuit (23A), and this detection signal is supplied to the microcomputer (24). Then, the microcomputer (24) uses the vacant base unit among the base units (21A) to (21C), for example, the base unit (21).
A) is selected, the transmission circuit (210) of the base unit (21A) is permitted to transmit on the downstream control channel by the control signal TCTL, and the control code
CTRL is an incoming call, handset (1A)-(1H)
A command signal CMND indicating the identification code HSID of the vacant handset and the channel number of the communication channel is formed, and this command signal CMND is supplied to the transmission circuit (210).

Therefore, the FM signal Sd having this command signal CMND
Is transmitted to the handsets (1A) to (1H) through the downlink control channel.

And now, the control code CT in the command signal CMND
The identification code HSID included in the RL is, for example, a handset (1
A), the signal CMND is obtained from the receiving circuit (120) of the handset (1A) and its identification code SYI
Since D and HSID match the identification codes SYID and HSID stored in the RAM (141) of the handset (1A), and the control code CTRL of the command signal CMND indicates an incoming call,
The microcomputer (140) controls the oscillation circuit (138) to form a ringer signal, and this signal is supplied to the speaker (139), and the speaker (139) emits a bell sound to notify an incoming call.

Then, when the user of the handset (1A) presses the talk key (132), the ringer signal of the oscillation circuit (138) is turned off and the bell sound is stopped, and then the transmission circuit (110) is controlled by the control signal TCTL. The command signal CM indicating that the transmission on the uplink control channel is permitted and the control code CTRL indicates the incoming call response and the handset identification code HSID.
An ND is formed and supplied to the transmission circuit (110).

Therefore, a command signal CMND indicating an incoming call response is transmitted to the base station (2) by the FM signal Sd of the control channel.

When the transmission is completed, the transmission circuit (110) and the reception circuit (120) are switched to the communication channel of the channel number specified by the base unit (21A) by the control signals TCTL and RCTL from the microcomputer (140). .

Also, the base unit (21A) receives the FM signal Su of the command signal CMND indicating the incoming call response from the handset (1A). When the signal Su is received, the transmission circuit is controlled by the control signals TCTL and RCTL. (210) and the receiving circuit (22
0) is switched to the communication channel of the channel number designated to the handset (1A) when receiving a call.

Therefore, from this point, a communication channel has been opened between the base unit (21A) and the handset (1A).

Further, in the base station (2), the switch circuit (22) is controlled by the microcomputer (24), and the transmission circuit (210) and the reception circuit (22) of the base unit (21A) are controlled.
0) is connected to the conversion circuit (231) of the interface circuit (23A) through the switch circuit (22), and the switch circuit (232) is turned on.

Therefore, the base unit (21A) is connected to the line (3A) through the switch circuit (22) and the interface circuit (23A).

Therefore, the handset (1A) is connected to the line (3A) through the base station (2), and can thereafter make a call in the same manner as when making a call.

When the talk key (132) is depressed when the call is ended, the call is ended similarly in the same manner, and the standby mode is set again.

Further, a call between any two of the handsets (1A) to (1H), that is, an extension call, is performed as follows.

That is, for example, when the handset (1A) is in the standby mode, the user presses the extension key (133) of the auxiliary keys (133) to (137), and then, of the dial keys (131), the handset of the handset to which an extension call is desired. When the number key corresponding to the number (which is equal to the handset identification code HSID) is pressed, the transmission circuit (110) is allowed to transmit on the control channel and the control code CTRL is changed to the keys (133) to (137). ) Is pressed, the pressed key is the extension key (133), the pressed numeric key (the other party's handset identification code HDIS) among the dial keys (131), and the user's own handset. A command signal CMND indicating the identification code HSID is formed and supplied to the transmission circuit (110).

Therefore, this command signal CMND is transmitted to the base station (2) by the FM signal Su of the uplink control channel.

If the base unit (21A) is empty, for example, the receiving circuit (22
0), the command signal CMND is taken out, it is determined that the request is for an extension call from the handset (1A), and thereafter, the handset (1A) and the base unit (21A) are connected in the same manner as when making a call. The call channel is opened.

Further, in the base station (2), a vacant base unit and a vacant communication channel are selected by the microcomputer (24). For example, if the base unit (21B) is vacant, the base unit (2B) is selected.
1B), the FM signal Sd of the command signal CMND is transmitted through the downstream control channel. However, at this time, the control code CTRL in the command signal CMND is
It is an extension call, and data indicating the handset identification code HSID of the other party with whom the handset (1A) desires an extension call and the channel number of the call channel are used.

When the FM signal Sd of the command signal CMND is received by the handset (1A) of the desired partner of the handset (1A), for example, the handset (1H), the handset (1H) When a bell sounds from the speaker (139) and the other party presses the talk key (131) of the handset (1H), a communication channel is opened between the handset (1H) and the base unit (21B).

In the base station (2), since the extension call is performed, the switch circuit (22) is controlled by the microcomputer (24), and the transmission circuit (210) and the reception circuit (220) of the base unit (21A) are switched by the switch circuit ( Through 22), it is connected to the receiving circuit (220) and the transmitting circuit (210) of the base unit (21B).

Therefore, the handset (1A) is connected to the handset (1H) through the base station (2), and thereafter, an extension call can be made between the handsets (1A) and (1H).

Then, the call is terminated and the handset (1A), (1H)
On the other hand, for example, when the handset presses the talk key (131), the handset (1A) and the base unit (21A) end the call in the same manner as the end of a call during a call with an outside line, and these units enter a standby mode. . Also, a command signal CMND indicating that the control code CTRL is the end of the call and the identification code HSID of the handset (1H) is sent from the base unit (21B) to the handset (1H), and the handset (1H) and the base unit (21B) ), The call termination processing is performed and these also enter the standby mode.

In addition, a similar protocol can be used to transfer an outside line from one handset to another,
It is also possible to make a three-party call with two handsets.

The present invention makes it possible to use the above-described multi-cordless telephone more conveniently, for example, in a two-family house, a small office, or a house with a store.

E Means for Solving the Problems Therefore, the present invention provides a handset (1A) to (1H)
A setting switch (250) for specifying which of the telephone lines (3A) and (3B) can be used is provided in the base station (2), and the handsets (1A) to (1H) can be used for telephones that can be used. Lines (3A) and (3B) are divided into groups, and the data is stored in the handsets (1A) to (1H).

F Effect In a case where a plurality of telephone lines are used, for example, in a two-family house, a small office, or a house with a store, a multi-cordless telephone can be effectively used.

G Embodiment FIG. 1 shows an embodiment of the present invention. In this embodiment, as in the case of the above-described multi-cordless telephone, two external lines are provided.
In this case, up to eight handset units can be used, and up to two doorphone unit units can be combined to form a doorphone.

 Here, the doorphone will be described first.

In the figure, (1i) and (1j) show an out-of-home unit of a door phone. Since these out-of-home units (1i) and (1j) are configured in the same manner, the following description will be made using the out-of-home unit (1i) as a representative example. , The receiver (121) and the microcomputer (140) are configured similarly to those of the handsets (1A) to (1H),
In place of the keys (131) to (137) and the oscillation circuit (138), a door phone key (151) consisting of a non-lock type push switch is connected to the microcomputer (140).
A chime sound signal forming circuit (158) is connected to the microcomputer (140).

In addition, the RAM (141) stores a system identification code SYID and an intercom identification code DPID instead of the handset identification code HSID.

And such a door phone outside unit (1i),
In the system combining (1j), (250) is a setting switch, which is provided in the base station. In this case, the setting switch (250) determines the number of handsets that the system can support (8 in this example).
) And the number of lines (two lines in this example)
× 2 sets of DIP switches (51A) to (51H), (52
A) to (52H), and furthermore, the setting switch (250) is provided with a number of external units that can be supported by this system (two in this example), and two switches corresponding to the number of lines. Two sets of DIP switches (61i), (61j), (62
i) and (62j).

The dip switches (51A) to (51H) correspond to the handsets (1A) to (1H), respectively.
A) to (1H) are used to set whether or not the line (3A) can be used.
In the case of "OFF", it cannot be used. Therefore, in the example of the figure, the switches (51A), (1C) to (1F) corresponding to (1F)
A), (51C)-(51F) or “On” and others are “Off”, so the line (3A) can be used
Handsets (1A), (1C) to (1F). Dip switches (52A) to (52H) also correspond to handsets (1A) to (1H).
(1H) sets whether or not the line (3B) can be used. As in the case of the switches (51A) to (51H), "ON" is set.
In the case of, it can be used, and in the case of "off", it cannot be used. Therefore, in the example in the figure, the handsets (1B), (1
C), (1G) and (1H) corresponding switches (52B) and (52
C), (52G) and (52H) are “ON” and the others are “OFF”, so the handsets (1B), (1C),
(1G) and (1H) can use the line (3B).

Dip switches (61i), (61j), (62
i) and (62j) are out-of-home units for doorphones (1i) and (1j)
And a handset (1A) to (1H) for defining a combination, and a switch (61i) or (61j)
Is set to “ON”, the external unit (1i) or (1j) can use the handset (1) that can use the line (3A).
A), (1C)-(1F) can be talked, and switch (6
If 2i) or (62j) is “ON”, the external unit (1i) or (1j) will be able to use the handset (1B), (1C), (1G), (1G) that can use the line (3B). 1H) and the switches (61i), (61j), (62i) and (62j) are "off", the out-of-home unit cannot talk to any handset, that is, is not used.

Furthermore, in each handset (1A) to (1H),
An external line type code which is set by the setting switch (250) of the base station (2) and which of the available external lines is stored in the RAM (141). That is, for example, if only the line (3A) can be used, the code “0”
1 ", code" 1 if only line (3B) can be used
If the two lines (3A) and (3B) can be used, the code "11" is stored in the RAM (141).

For example, when a call is made from the handset (1A), when the talk key (132) of the handset (1A) is pressed, a command signal CMND is formed by the microcomputer (140), which is transmitted from the handset (1A) to the base station (1A). Sent to 2).

Then, in the base station (2), the command signal CMND from the handset (1A) is received, and the setting state of the dip switches (51A) and (52A) of the setting switch (250) is checked by the microcomputer (24). . In this case, since the handset (1A) can use only the line (3A), the microcomputer (24) checks whether or not the line (3A) and the interface circuit (23A) are free. The switch circuit (22) and the like are controlled so that the handset (1A) can talk over the line (3A). If the line (3A) and the interface circuit (23A) are not vacant, the base station (2) informs the handset (1A) from the command signal CMND that line communication is not possible.

Or talk key (132) of handset (1B)
Is pressed, this handset (1B) can only use the line (3B), so it is checked whether the line (3B) and the interface circuit (23B) are free, and if it is, The handset (1B) is notified that it is possible to talk and if it is not vacant, it is not possible to talk on the line.

Further, when the talk key (132) of the handset (1C) is pressed, the handset (1C) can use both the lines (3A) and (3B), so that the lines (3A) and (3A) can be used.
Talking is enabled through one of the vacant lines in (3B), and if both lines (3A) and (3B) are not vacant, the handset (1C) is notified that line communication is not possible.

On the other hand, incoming calls to the handsets (1A) to (1H) are performed as follows.

That is, for example, when a call is received via the line (3A), the microcomputer (24) forms a command signal CMND having an outside line type code “01” indicating that the call is from the line (3A), and this is a base signal. Sent from station (2) to handsets (1A)-(1H).

Then, the external line type code “01” of the command signal CMND transmitted from the base station (2) and the external line type code stored in the RAM (141) of each of the handsets (1A) to (1H) are stored in the microcomputer (140). ), And if both outside line type codes match, a bell sound is emitted from the speaker (139) to indicate an incoming call. That is, in this example, a bell sound is emitted from the speakers (139) of the handsets (1A), (1C) to (1F).

Therefore, for example, when the talk key (132) is pressed by the user of the handset (1A), the call response and the command signal CMND indicating the handset identification code HSID are transmitted from the handset (1A) to the base station (2).

Next, in the base station (2), a command signal CMND indicating the identification code HSID of the handset (1A) is transmitted to each handset in response to the command signal CMND from the handset (1A).

Then, among the handsets that can use the line (3A), the handsets (1C) to (1F) enter the standby mode. Then, after that, the handset (1A)
A) is connected and a call is made.

 Next, the operation of the door phone will be described.

Now, the visitor enters the door phone key (15
When 1) is pressed, a control signal is supplied from the microcomputer (140) to the formation circuit (158) to form a predetermined chime sound signal Sc, and this signal Sc is supplied to the speaker (1) through the addition circuit (123).
Supplied to 21).

Therefore, a chime sound confirming that the key (151) is pressed is emitted from the speaker (121) for, for example, 10 seconds.

At this time, in the microcomputer (140), a command signal CMND indicating that the control code CTRL is a call from the unit (1i) and the intercom identification code DPID is formed, and this signal CMND is transmitted to the transmission circuit (110). The signal is converted into the FM signal Su of the upper control channel and transmitted to the base station (2).

Then, in the base station (2), the microcomputer (24) checks the "on" and "off" states of the dip switches (61i) and (62i) for the external unit (1i) of the setting switch (250). . In this example, since the switch (61i) is "ON" and the switch (62i) is "OFF", the handsets (1A) and (1C) correspond to the switch (61i) which is "ON". ) ~ (1
F) is called and thereafter, for example, when the handset (1A) answers in the same manner as in the case of an extension call, a communication channel is opened between the unit (1i) and the handset (1A) through the base station (2). It is.

Therefore, the voice of the visitor is picked up by the microphone (111), and the voice of the household responded by the handset (1A) is output from the speaker (121), and the conversation (call) between the visitor and the household is performed. It can be carried out.

When the conversation ends, the handset (1
When the talk key (132) of (A) is pressed, the handset (1A) and the remote unit (1i) enter the standby mode according to the same protocol as that used for ending the extension call between handsets.

In the above, the case of the outside unit (1i) has been described. In the case of the outside unit (1j), the setting switch (250) is a dip switch (61j) for the outside unit (1j). Since the "off" switch (62j) is "on", the handsets (1B), (1C), (1G), and (1H) can communicate with the external unit (1j).

Thus, according to the present invention, in the multi-cordless telephone, the setting switch (250) for setting which of the handsets (1A) to (1H) can use which of the lines (3A) and (3B) is used. Since it is provided in the station (2), for example, in a two-family house, a small office or a house with a store, a plurality of handsets (1A) to (1H)
Can be conveniently used by dividing them into groups for each line (3A) and (3B).

For example, in a two-family house, children and couples who use the telephone frequently can use two lines (3A) and (3B), and parents and parents who use it less frequently can use only one line (3A). It is also possible to use both lines for a handset with a high frequency of use, and to use only one line for a handset with a low frequency of use.

Alternatively, some handsets have one line (3A)
Only the other handset and the remaining handset is the other line (3B)
There can be two independent systems, such that only one can be used.

Furthermore, according to this embodiment, the setting switches of the lines that can be used are provided not in each handset but in the base station (2), so that which handsets (1A) to (1H) are connected to which line It is convenient to set and manage whether (3A) and (3B) can be used.

Further, according to this embodiment, the handset (1) capable of communicating with the outside units (1i) and (1j) of the intercom can be used.
Since A) to (1H) can be set, for example, when two doorphones are used in a two-family house or the like, even if the system is one, two doorphones can be distinguished from each other, which is convenient.

Also, connect a tape recorder etc. to the handset,
By providing a so-called answering machine function, it is possible to operate as an answering machine only for a line that the handset can use.

The writing of the external line type code to the RAM (141) of each handset (1A) to (1H) is performed by each handset (1A)
When writing the system identification code SYID from the base station (2) to, for example, a wire in (1H) to (1H), the system identification code SYID may be written at the same time.

If only one line is connected to the base station instead of a plurality of lines, all of the setting switches (250) for the unconnected lines may be turned off.

If the number of handsets to be used is smaller than the number capable of supporting a multi-cordless telephone, all the extra DIP switches may be turned off.

Further, when the intercom is not required, the dip switches (61i), (61j), (6) of the setting switch (250) are used.
2i) and (62j) may all be turned off.

H Advantageous Effects of the Invention According to the present invention, in the multi-cordless telephone, a setting switch (1A) to (1H) for setting which of the lines (3A) and (3B) can be used. 250) in the base station (2), for example, in a two-family house, a small office or a house with a store, a plurality of handsets (1A) to (1H)
Can be conveniently used by dividing them into groups for each line (3A) and (3B).

For example, in a two-family house, children and couples who use the telephone frequently can use two lines (3A) and (3B), and parents and parents who use it less frequently can use only one line (3A). It is also possible to use both lines for a handset with a high frequency of use, and to use only one line for a handset with a low frequency of use.

Alternatively, some handsets have one line (3A)
Only the other handset and the remaining handset is the other line (3B)
There can be two independent systems, such that only one can be used.

According to the present invention, since the data of the grouping set on the base station side is stored in each handset, there is no need to change the control code, and using the existing cordless telephone system, A system capable of good grouping is obtained.

[Brief description of the drawings]

FIG. 1 is an overall view of an embodiment of the present invention, FIG. 2 is an overall view of a multi-cordless telephone, and FIG. 3 is a view showing a format of a command signal. (1A) to (1H) are handsets, (2) is a base station, (3A) and (3B) are telephone lines, and (250) is a setting switch.

Claims (1)

(57) [Claims] 1. A cordless telephone comprising: a base station connectable to a plurality of telephone lines; and a plurality of handsets for performing wireless communication with the base station, wherein the base station includes: A setting switch for setting a usable telephone line among the plurality of telephone lines is provided, and information of a telephone line usable by the own device set by the setting switch is stored in each of the plurality of handsets. A cordless telephone provided with a storage unit, wherein the use restriction processing of the plurality of telephone lines is performed by each handset based on information stored in the storage unit.