JPH01273443A - Cordless telephone system - Google Patents

Abstract

PURPOSE:To attain the expansion of the service area by connecting a handset of the 1st cordless telephone set to a base unit (used as a relay unit) of the 2nd cordless telephone set. CONSTITUTION:Relay units 1B, 1C having the same function as the base unit are installed in a service area 4A of the base unit 1A of the 1st cordless telephone set and they are connected to the 1st handset 2A in wire communication. The communication with the 1st base unit 1A is attained via the relay units 1B, 1C and the 1st handset 2A from the 2nd handsets 2B, 2C communicated in radio signal with the relay units 1B, 1C. Even if the 2nd handsets 2B, 2C exist at the outside of the service area 4A of the base unit 1A. They are communicated if they reside in the service areas 4B, 4C of the relay units 1B, 1C. Thus, the substantial service area of the 1st base unit 1A is expanded.

Description

[Detailed description of the invention] [Industrial application field] This invention relates to cordless telephone systems.

[Summary of the invention]

The present invention relates to a cordless telephone device that includes a handset and a base unit and performs communication by exchanging identification signals with each other. By connecting the handset to the first cordless telephone device (used as a unit), even if the handset of the second cordless telephone device is outside the service area of the first cordless telephone device, the first cordless telephone device
This device enables communication with the base unit of a cordless telephone device.

[Conventional technology]

There is a cordless telephone device that consists of a telephone device, a mobile radio called a handset, and a fixed station called a base unit, and transmits and receives wirelessly between the handset and the base unit. The handset is a unit that is actually operated by the user, and the base unit is a unit that connects to a telephone line and controls a wireless line with the handset.

The handset can move freely within the range of wireless communication with the base unit, that is, within the service area. An identification code is assigned to the handset, and this code is exchanged with the base unit to prevent interference.

9 and 10 are examples of current cordless telephone devices.

The example in Figure 9 has one telephone line (3) connected to the base unit (1) and one handset (2), and is a basic type for general home users. .

In the example of FIG. 10, the number of telephone lines (3) connected to the base unit (1) is one, and the handset is (21
) to (2n), this is a so-called multi-cordless phone that can also be used as an office phone.

In FIGS. 9 and 10, (5) is a transmitting and receiving antenna.

[Problem to be solved by the invention]

In any of the examples explained above, the solid line (4) in FIGS. 9 and 10 corresponds to one base unit.
The handset could only be used within the service area indicated by the circle.

In view of this point, the present invention aims to provide a cordless telephone system capable of expanding the service area.

[Means to solve the problem]

A cordless telephone system according to the present invention includes first and second handsets, a base unit that is connected to a telephone line and performs cordless transmission and reception with the first handset, and a base unit that is installed within the service area of the base unit. , a relay unit that performs cordless transmission and reception with a second handset, the first handset is connected to the relay unit, and the two can be mutually controlled, and the base unit and the first handset are connected to the relay unit. Communication is possible between the handsets by sending and receiving the first identification signal, and communication between the relay unit and the second handset is made possible by sending and receiving the first identification signal.
Communication is enabled by sending and receiving a second identification signal different from the identification signal of.

[Effect]

When a call arrives, a transmission signal is sent from the base unit to the first handset. Since the first handset and the relay unit are connected, the transmission signal is sent to this relay unit. The relay unit wirelessly provides the received signal to the second handset. When a call is made, a transmission signal from the second handset is transmitted in the reverse path to the base unit and sent out onto the telephone line.

Therefore, when the relay unit is installed at the limit position of the base unit's service area, the second handset located further away from the base unit's service area by the radius of the relay unit's service area and the base It becomes possible to send and receive data to and from the unit.

〔Example〕

An embodiment of this invention will be described below with reference to the drawings.

In this embodiment, the multi-cordless telephone device shown in FIG.
Three systems of C are used.

System A is a base unit) (IA) with 5 telephone lines.
Line connection is possible and 10 handseras) (2AI>
(2A2) ... (2A+o) is provided.

System B can connect two telephone lines to the base units) (IB), and has five handseras) (2B, )(
282) ...(2BS) is provided.

System C has 2 telephone lines on Base Units (IC).
Line connection is possible, and 5 handsets (2C,) (
2C2) ...(2C5).

Then, the base unit (LA) of the entire system and the base units (IB) (IC) of systems B and C are used as relay units, and the entire system is constructed as shown in Figure 1. Configure.

Sunawachi, base unit CIA to the system) l:
: Connect up to 5 telephone lines. The base units (IB) and (IC) of systems B and C are placed within the service area of this base unit (IA) within the circle indicated by the solid line (4^). And the base unit (1B
) (hereinafter referred to as relay unit (IB)) and the handset (2^, ) and (2A2) to the system are connected as described below. In addition, the base unit (IC)
(hereinafter referred to as medium m unit (IC)) and system A
(2A3) and (2^4) as described below. System A's other handset (2A
S) to (2A, .) are to be used within the service area (within the solid line (4A)) of the base unit (1A).

System B handset (2B+) ~ (285)
is a relay unit) (1B) should be used within the service area (within the circle of solid line (4B)).

Mata, System C handset (2CI) ~ (2
cs) should be used within the service area (within the solid line (4C)) of the relay unit (IC).

The base unit and handset used in this example each have a digital data output port. The handset is also provided with a terminal for connection to the telephone line connection terminal of the base unit. Then, use the base unit as a relay unit,
When connecting a handset to this, use these input/output ports and connection terminals.

In other words, the relay unit (IB) and the handset (2
A+) (2A2), and the relay unit (IC) and handset (2A3) (2A,) connect the input/output ports of digital data, respectively, and the relay unit (IC) (1B) (IC) Connect the telephone line connection terminal of the handset (2AI) (2A2) and the connection terminal of the handset (2A3) (2A, ), respectively.

The relay units (IB) and (IC) are the handsets (2A, ) (2^2) and (2A3) (2A
4), the handset (2AI) (2A
2) and (2^3) (2A4) are relay units (
Data transmission/reception is performed via a digital data input/output port so that the IB) and (IC) can be controlled in the same manner as incoming calls from a normal telephone line.

By configuring as described above, the handsera) (2L
) ~ (28s) is the relay unit (IB) -
node set (28,) or (2A2) - this base unit (IA) via the base unit (IA)
You can connect to the telephone line connected to. Also, handset / ) (2c+) ~ (2CS) is a relay unit (IC) H handset (2A3) or (
2^4) +-+ Can be connected to a telephone line via the pace unit (IA).

In this way, the handset (2a+) ~ (2B,)
Handsets (2CI) ~ (2Cs) are
Even if you are outside the service area of the base unit (IA), you can connect to the telephone line connected to the base unit (IA) as long as it is within the service area of the relay unit (IB) and (IC). Service area can be expanded.

FIG. 3 shows an example of the configuration of a handset used in this example. In the same figure, (112) to (116)
is a transmitting circuit, and (121) to (126) are receiving circuits. Also, (101) is a terminal for connecting to the telephone line connection terminal of the relay unit, (102)
is an input/output terminal connected to a digital data input/output port (139). Also, (103) and (1
04) When used as a normal handset (
This is a switch circuit that can be switched between (normal mode) and when used as a relay (relay mode).When used as a normal handset, it is connected to the terminal N side, and when used as a relay, it is connected to the terminal S side. be done.

FIG. 4 shows an example of the configuration of the base unit used in this example. In the same figure, (212) to (21
6> is a transmission circuit, (221) to (226')
is a receiving circuit. Further, (2 inches) is a telephone line connection terminal, and (202) is a digital data input/output terminal.

In the case of a relay unit (IB), there are two telephone line connection terminals (201), each with a terminal (101) for connecting the handset (2^1) and (2^2).
is connected, and the input/output terminal (202) of the base unit (IB) and the handset (2AI) (2A2
) is connected to the input/output terminal (102). relay unit) (IC) and handsera) (2A3) and (
2A4) is similarly connected.

And handset (2AI) ~ (2A4)
The switch circuits (103) and (104) are switched to the terminal S side.

Other handsets (2A-(2A, O), (2B,
) ~ (28%).

(2CI) ~ (2cs) Then, terminal (101)
and (102) are not used, and switch circuits (103) and (104) are connected to the terminal N side.

Also, the base unit) (LA) is the terminal (201)
There are 5 lines, to which 5 telephone lines are connected.

The operation in the handset will be explained.

In the normal mode, the audio signal St from the transmitter (111) is supplied to the transmission circuits (112) to (116) via the switch circuit (103), and in the relay mode, it is supplied from the connection terminal (101). The signal of the coupling circuit (1
05) and the switch circuit (103). The signal from the switch circuit (103) is then supplied to the FM modulation circuit (113) through the low frequency amplifier (112) to be converted into an FM signal (FM intermediate frequency signal), and this FM signal is sent to the mixer circuit (114).
) as well as PL L (143)
An alternating signal (local oscillation signal) of a predetermined frequency is supplied from the mixer circuit (114) to the modulation circuit (113).
The FM signal from is the FM signal S of the specified upstream channel.
u, and this FM signal Su is passed through a bandpass filter (
115) The high frequency signal is supplied to the antenna (119) through the Hower amplifier (116) and transmitted to the base unit.

Next, reception using a handset will be explained.

First, in the normal mode, the signal Sd from the base unit is received by the antenna (119), and the received signal Sd is passed through the bandpass filter (121) whose pass band is all down channels and the high frequency amplifier (122). At the same time, a local oscillation signal of a predetermined frequency is supplied from PLL (143) to the mixer circuit (123), and the signal Sd is made into an intermediate frequency signal, and this intermediate frequency signal is supplied to the FM demodulation circuit (125) through the intermediate frequency amplifier (124) to demodulate the audio signal Sr, and this signal Sr passes through the switch circuit (104) and the low frequency amplifier (126) to the receiver (127).
) is supplied to

In the relay mode, the signal Sr is supplied to the relay unit through the switch circuit (104) and the coupling circuit (105).

Furthermore, in the handset, (130) indicates a control circuit that controls communication channels and the like. This control circuit (130) is composed of a micro combinator, and (131) is, for example, a CPU with 8-bit parallel processing, (132) is a ROM in which a program is written, and (133) is a work area. (134) to (139) indicate input/output ports, and these circuits (132) to (
139) is connected to the CP via the system bus (140).
Connected to U (131).

The boats (134) and (135) are equipped with numeric keys (dial keys) (1
41) and hook switch (142) are connected, and these numeric keypad (141) and switch (14
2) A dynamic scan is performed by the boat (134) and which one is operated is determined by the boat (135).
Detected by

Also, P L L (14
3) is connected, a dip switch (144) is also connected to the boat (137), and PLL (143) is connected based on the output of the switch (144).
The frequency division ratio of the variable frequency divider circuit in P L
L (143) to mixer circuit (114).

(123) specifies the frequency of the local oscillator signal supplied to (123), which specifies the communication channel of the handset (1).

Further, (145) indicates a detection circuit, this detection circuit (145) is supplied with the output of the demodulation circuit (125) and extracts the identification code ID transmitted from the base unit. 137)
supplied to

And (147) indicates a tone generator,
This converts the identification code ID and dial signal DS from a binary signal to an audio band FSK signal (tone signal) S
The signal S' is converted into an amplifier (11
2) is supplied to.

Furthermore, a control signal is taken out from the baud (138), and this control signal is supplied to the modulation circuit (113) to control whether or not the FM signal can be sent out from the modulation circuit (113). In addition, the BO) (13g) has a buzzer (14g) that alerts you when there is an incoming call.
8) is also connected.

In addition, various control signals are obtained from the baud (139), which are supplied to the relay unit through the input/output terminal (102), and control signals from the relay unit through the input/output terminal (102) are supplied to this relay unit. Port (1
39).

Next, let's talk about the base unit.

In other words, the signal (radio wave) Su from this hand and set
is received by the antenna (219), and the received signal Su is passed through a bandpass filter (221) whose pass band is all uplink channels and a high frequency amplifier (2
22), a local oscillation signal of a predetermined frequency is supplied from PLL (243) to the mixer circuit (223), the signal Su is converted into an intermediate frequency signal, and this intermediate The frequency signal is supplied to the FM demodulation circuit (225) through the intermediate frequency amplifier (224) to demodulate the audio signal St, and this signal St is sent to the low frequency amplifier (226) and the coupling circuit (225).
229) Telephone circuit connection terminal (201) through
sent to.

The audio signal Sr from the line connection shrine (201) is supplied to the FM modulation circuit (213) through the coupling circuit (229) and the low frequency amplifier (212) to become an FM signal, and this FM signal is sent to the mixer circuit (214). ), an alternating signal of a predetermined frequency is supplied from PLL (243) to a mixer circuit (214), and the FM signal from the modulation circuit (213) is converted into an FM signal S.
FM signal S of the downlink channel of the same channel as u
d, and this signal Sd is passed through a bandpass filter (21
5) and a high frequency power amplifier (216), the signal is supplied to the antenna (219) and transmitted to the handset (1).

Further, in the base unit, (230) indicates a control circuit. This control circuit (230) is configured similarly to and has the same function as the control circuit (130) of the handset. The circuits corresponding to circuits (131) to (147) are as follows:
Instead of the 100's code, the 200's code will be added and the explanation will be omitted. However, in the control circuit (230),
Numeric keypad (141), hook switch (142)
and buzzer (148), and a signal line for signal SB is provided between port (238) and coupling circuit (229). In addition, signal SB
is a signal indicating when there is an incoming call from outside.

When making a call from the handset (2As) to (2 people), for example, the handset (2As) (using the normal mode), the ROM (
132) and (232), the operations shown in the calling sequence of FIG. 5 are performed.

That is, when the hook switch (142) is operated, the identification code ID is taken out from the RAM (133) based on its output, and this code ID is converted into an FSXSX signal S color by the generator (147) and supplied to the amplifier (112). At the same time, the modulation circuit (113
) is permitted to send out FM signals, and therefore the identification code ID is assigned to the base unit (IA) by the FM signal Su.
), and a call request is made.

In the base unit (IA), the signal Su
When received, the signal Sf is taken out from the rear circuit (225) and the identification code ■D is sent from the detection circuit (245).
is taken out. And this code ID is RAM (
233). If it is not correct (from another subscriber's handset), no further processing is performed and the device remains in a standby state; if it is correct, the modulation code is circuit(
213) FM signals are allowed to be sent from the network, and a communication channel is established.

A wireless channel is specified for the handset (2Al), and the handset (2Ai) receives this and sets the wireless channel. When the communication channel is established in this way, the base unit (IA) not only responds to the handset (2^, ) to establish the communication channel, but also establishes a connection with the telephone line.

Then, a dial tone from the central office side is given to the handset (2^,), so the user is assured of this.

Next, press the numeric keypad (
When the generator (141) is operated, a dial signal DS corresponding to the other party's telephone number is generated and the generator (141) is operated.
47) Dial tone signal (FSK signal)
Sf and similarly transmitted to the base unit (IA).

Then, in the base unit (LA), the signal Sf is taken out from the demodulation circuit (225), and the signal Sf is extracted from the amplifier (226).
) and then sent out to the telephone line (3) through a coupling circuit (229). Therefore, this signal Sf
The other party is called, and if the other party answers the call, from then on,
Calls can be made as described above.

In Figure 5, solid diagonal arrows indicate sequences carried out wirelessly, dotted diagonal arrows indicate sequences carried out by wire, and solid horizontal arrows indicate operations performed by the user and incoming calls from the central office. ing. The same applies to FIGS. 6 to 8, which will be described later.

On the other hand, when a call is received from the other party, the operations shown in the incoming call sequence in FIG. 6 are performed.

That is, when a call is received from the other party, the signal SB is taken out from the coupling circuit (229) in the base unit (IA), an identification code ID is formed based on this, and the signal Sf is generated by the generator (247>).
It can be converted to Then, this signal Sf is applied to the amplifier (21
2) and the modulation circuit (213)
Therefore, the identification code ID is FM signal S (]).
sent to.

Then, in the handsera (2AS), when the signal Sd is received, the signal S is sent from the demodulation circuit (125).
f is taken out and the identification code ID is taken out from the detection circuit (145). And this code ID and RA
Matching with the identification code stored in M (133) is checked, and if it is not correct, no further processing is performed and the standby state is continued, but if it is correct, the FM signal is sent out from the demodulation circuit (113). After being granted permission and establishing a communication channel in the same way as when making a call, a buzzer (148) will sound to notify you of an incoming call. Therefore, the handset (111), (12
When 7) is picked up, the buzzer (148) stops ringing and the call response is sent from the handset (2As) to the base unit (IA), and the telephone line is connected. This makes it possible to make a phone call as described above.

Next, handset (2B+) ~ (2L) (2C,)
- (2C5), for example (2a,), will be described.

FIG. 7 shows the calling sequence at this time.

That is, when the hook switch (142) is operated, a call request is made from the handset (2B+) to the relay unit (IB) in the same manner as in the normal mode shown in FIG. The base unit (IB) makes a call response to the handset (2L), and also sends a baud (239) and input/output terminal (20
2) Handsera via (2AI) or (
A call request signal is transmitted to the input/output terminal (102) of 2^2). Handset (2AI) or (2A2)
In response to this, it issues a call request to the base unit (1^). And this handset (2AI)
Alternatively, a communication channel is established between (2A2) and the base unit (IA) in the same manner as described above, and the base unit (LA) establishes a line connection. therefore,
The dial tone from the telephone office is on the handset (2^l)
or (2A2).

Thus the handset (2AI) or (2A2)
Once a communication channel is established with the base unit (LA), the handset (2A, ) or (2A
2) A call response signal is transmitted from the IB to the relay unit (IB) through the input/output terminal (102). The relay unit (IB) receives this call response signal via the baud (239), and then transmits the call response signal to the handset (239).
A communication channel is established between the relay unit (IB) and the relay unit (IB) in the same manner as described above, and the relay unit) (1B) is connected to the handset (2A+) or (2A+).
2) A line connection is established between.

Therefore, a dial tone signal from the telephone is given to the handset (2B,), and after confirming this, the user performs a dial operation corresponding to the telephone number of the other party. Then, the dial data is sent to the relay unit (IB)
→Handset (2AI) or (2A2) →Base unit) Sent to the telephone line via (IA),
If the other party answers the phone, the call can be made.

Next, FIG. 8 shows the incoming call sequence for this handset (2Bl).

In other words, when a call is received from the other party, a call request is sent from the base unit (IA) to the handset (2AI).
or (2A2) is given. Handset (2A
I) or (2^2) sends the incoming call response to the base unit (I
A) and transmits an incoming call request signal to the relay unit (IB) through the input/output terminal (102).

In response, the relay unit (IB) issues an incoming call request to the handset (2B+), and a communication channel is established between the relay unit (IB) and the handset (2Bl). When this communication channel is established, the relay unit (1B) transmits the incoming call response to the handset (2AI) or (2A2) via the input/output terminal (202). In response, the handset (2AI) or (2A2) establishes a communication channel with the base unit (IA). Then, the buzzer (148) on the handset (2Bl) rings, announcing that there is an incoming call. Therefore, when the handset (111) (127) is picked up, the buzzer stops ringing and a call response is sent to the relay unit (IB). relay unit) (IB)
In response to this, Hand Sera) (2AI) The sentence is (2A2
) to establish a line connection. Thereafter, the handset (2A, ) or (2^2) sends the called response to the pace unit (IA).

As a result, the base unit (one person) connects the telephone line. Therefore, the handset (2B, ) → relay unit (IB) → handset (2A, ) or (
2A2) → The base unit (IA) is sequentially activated to connect the handset (2B+) to the telephone line, making it possible to talk to the other party.

The communication channel with the base unit (1^) is also connected via the relay unit (IC) and the handsera) (2As) or (2A4) for calls made and received by the handsera) (2CI) to (2Cs). The same can be done by

In the above example, the base unit is slightly modified and used as a relay unit, and a slightly modified handset is connected to this and used for relay. ) (2A
2) may be prepared as a relay unit having a built-in configuration.

In addition, in the above example, all handsets and base units were configured as shown in FIGS. 3 and 4, but in the example in FIG.
A2) (2A3) (2A4), base unit (I
B) Only the (IC) may be configured as shown in FIGS. 3 and 4.

〔Effect of the invention〕

According to this invention, a relay unit having the same function as the base unit is installed within the service area of the base unit of the first cordless telephone device, and this and the first handset of the first cordless telephone device are connected by wire. By being connected, the second handset, which can communicate wirelessly with the relay unit, can communicate with the first base unit via the relay unit and the first handset. Therefore, even if the second handset is located outside the service area of the base unit, communication can be performed as long as it is within the service area of the relay unit. Therefore, if multiple relay units are provided within the service area of the first base unit and the above configuration is adopted,
The service area of the plurality of relay units can also be expanded as a substantial service area of the first base unit.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the configuration of an example of a cordless telephone system according to the present invention, FIG. 2 is a diagram showing an example of the telephone device used in FIG. 1, and FIG. 3 is a block diagram of an example of the configuration of a handset. FIG. 4 is a block diagram of one embodiment of the configuration of the base unit, FIGS. 5 to 8 are diagrams for explaining the sequence of call origination and call reception in the telephone system according to the present invention, and FIGS. 9 and 10. The figure is a diagram for explaining a conventional cordless phone. (IA) is the first base unit, (1B) (IC)
is the relay unit), (2A,) ~ (2A,.) is the first handsera), (2B,) ~ (2Bs)
and (2CI) to (2Cs) is the second handset. Agent Paige Ito
Hide Matsukuma Sokezos (1pm)
Normal) Fig. 5 1st peak - Kebus (connected tree) Fig. 8 Henrese k Middle up A construction; Fu Y Hen l/a
Figure 8 - 71 knit Figure 8 Base) F-2 earphones Figure 9 Clothes ÷ four stitches Figure 10

Claims (1)

[Claims] First and second handsets, a base unit that is connected to a telephone line and performs cordless transmission and reception with the first handset; a relay unit that performs cordless transmission and reception between the base unit and the second handset, the first handset is connected to the relay unit, and the two can be mutually controlled; Communication is possible between the handsets by exchanging a first identification signal, and a second identification signal different from the first identification signal is exchanged between the relay unit and the second handset. A cordless telephone system that enabled communication.