JPH02166928A - Cordless telephone - Google Patents

Abstract

PURPOSE:To extend the range of speech of a handset by enabling one handset to be used in plural zones by storing plural system identification codes in the handset or a base unit. CONSTITUTION:The system identification codes IDA-IDC are stored in the ROMs 241A-241C of the base units 2A-2C, respectively, and the identification codes IDA-IDC are stored in the RAM 141 of the handset 1. For example, in call issuing, command signals with the identification codes IDA-IDC are transmitted from the handset 1 to the base units 2A-2C, and the base units 2A-2C permit transmission/reception with the handset 1 if either received identification codes IDA-IDC coincides with the identification codes of the base units 2A-2C. In such a way, since one handset can be used in plural service areas, the range of speech of the handset can be extended.

Description

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

[Summary of the Invention] The present invention provides a cordless telephone in which a single handset can be used in multiple zones by storing multiple system identification codes in the handset or base unit. This greatly expands the communication range of the

(Prior Art) In Japan, the United States, and other countries, a telephone system called a cordless telephone is being considered.

As shown in Fig. 3, it is composed of a transceiver (1) called a handsera 1- and a transceiver (2) called a base unit, and a telephone line (3) is connected to the base unit (2). At the same time, the base unit (
2) and the handset (1) are connected by radio waves, and calls from subscribers are answered in the same way as with a general telephone.

Note that the distance that the handset (1) can be separated from the base unit (2), that is, the service area is:
It is about 100m. In addition, the frequency of the radio waves used between the handset (1) and the base unit (2) is
In the case of Japan, the upstream channel is the 250 MH2 band, the down channel is the 380 MH2 band, and the 8
7 duplex channels are permitted.

Therefore, the subscriber can freely move the handset (1) when making a call, for example to use the phone outdoors. What's more, the phone cord won't get tangled or get in the way.

FIG. 4 shows the outline of such a handset (1) and base unit (2).

That is, when transmitting a call, the handset (1)
The audio signal St from the microphone (111) for speaking is supplied to the transmitting circuit (110) and transmitted to the upstream channel F.
The M signal is S in color, and this signal Su is transmitted to the antenna (100
) and transmitted to the base unit (2).

Then, in the base unit (2), a signal (radio wave) Su is received by an antenna (200), and this signal Su is supplied to a receiving circuit (220) to receive an FM signal S.
The colored audio signal St is demodulated, and this signal St is 4ti
J! /2-wire conversion circuit (231) → relay circuit (232)
is sent out to the telephone line (3) through the signal line.

Also, when receiving a call, the voice signal Sr from the telephone line (3)
is supplied to the transmitting circuit (210) through the signal line of the relay circuit (232) → conversion circuit (231), and is converted into a downstream FM signal S, and this signal Sd is supplied to the antenna (200) and sent to the handset. (1).

In the handset (1), the signal Sd is received by the antenna (100), this signal Sd is supplied to the receiving circuit (120), and the audio signal Sr is demodulated from the FM signal S. is the speaker for receiving calls (
121).

Furthermore, (140) and (240) indicate microcomputers for system control, and these microcomputers (140) and (240) are constituted by, for example, an 8-bit type one-chip IC. These microcomputers (140) and (240) perform the following processing when a call is made and when a call is received. However, in the following description, the process of selecting a communication channel (voice channel) in the MCA system will be omitted for simplicity.

That is, when making a call, on the handset (1),
When the talk key (132) is changed from standby mode to talk mode, the signal TCTL from the microcomputer (140)
The transmitting circuit (110) is controlled to permit transmission of the S color FM signal. Subsequently, a command signal CMND (details will be described later) indicating a call origination from the microcomputer (140) is output, and this command signal CMNO is supplied to the transmitting circuit (110), so that the command signal CMND is output.
FM signal S color antenna (1
00).

Therefore, this command signal CMNO is taken out from the receiving circuit (220), but this command signal CMNO is taken out from the receiving circuit (220).
0), and it is determined that the call is an origination.

Then, the microcomputer (240) activates the relay circuit (23).
2) is controlled to the off-hook state and the conversion circuit (231)
is connected to the line (3) through the relay circuit (232), and the transmission of the FM signal S color is permitted by the signal TCTL.

Therefore, the handset (1) has a base unit (
2) Through times! This means that it is connected to tlA(3).

Therefore, when the other party's telephone number is input using the dial key (131), a command signal CMND indicating that the telephone number is to be transmitted and having the data of the input telephone number is sent.
It is output from the microcomputer (140) and transmitted from the FM signal S color.

When this FM signal is received by the S color base unit (2), the command signal CMNO is discriminated by the microcomputer (240), and the microcomputer (240) controls the dial signal forming circuit (233) to send the command signal. A tone encoded signal (DTMF signal) TENC corresponding to the telephone number sent by CMND is formed, and this signal TENC is supplied to the conversion circuit (231) and sent out to the line (3).

Therefore, the other party is called by sending out the signal TENC, and once the other party answers the call, the conversation can be made as described above.

When a call arrives, the detection circuit (234) detects a ring tone signal when the call is received, and in accordance with this detection signal, the microcomputer (240) outputs a command signal CMNO indicating the incoming call. Signal CMN
D is supplied to a transmitting circuit (210) and transmitted as an FM signal Sd.

In the handset (1), this command signal CMNO is taken out from the receiving circuit (120), and the microcomputer (140) drives the ringer speaker (139) through the oscillation circuit (138) to receive a call. I am informed that.

Therefore, when the talk switch (132) is changed from standby mode to talk mode, the same process as when making a call is performed, and the handset cell l-(1) is connected to the line (3) through the base unit (2). After that, you can talk to the other party.

Then, when the call ends, when the talk key (132) is changed from the talk mode to the standby mode, a command signal CMNO indicating the end of the call is generated in the microcomputer (140), and this is transmitted by the FM signal Su. The transmission of the FM signal Su is stopped by the signal TCTL.

In addition, in the base unit (2), when the command signal CMND indicating the end of the conversation is sent, the microcomputer (24)
0), the relay circuit (232) is controlled to the on-footer state, and the signal TCTL stops the transmission of the FM signal Sd.

Therefore, from now on, the handset (1) and the base unit (2) will wait for an outgoing or incoming call.

FIG. 5 shows an example of the signal format of the command signal CMND, which starts with a bit synchronization signal BS of 12 or more bits, in this example 24 bits.
YN followed by a 16-bit frame synchronization signal FS
Has YN. In this case, these signals BSYN.

FSYN is, for example, BSYN="010101010101010101
010101"FSYN="11000100110
10110”...FSYN for upstream channel='
1001001100110110'...Has a specific bit pattern shown for lower 7 channels.

Furthermore, the command signal CMNI), following the signal FSYN, contains a 25-bit system identification code ID for identifying the paired handset (1) and base unit (2), and a 15-bit system identification code ID for this identification code ID. error correction code ECC in order, and a 40-bit control code CTRL following the code ECC.

In this case, the identification code ID is transmitted between the handset (1) and the base unit (2) by a command signal C? Every time IND is accessed, it is checked on the receiving side,
The bare handset (1) and the base unit (2)
), the command signal CMNO is valid only between the two. Therefore, this identification code ID is stored in the RAM (141) of the handset (1) and the ROM (241) of the base unit (2).

Furthermore, the control code CTRL is a code for controlling the opening/closing of the channel between the handset (1) and the base unit (2) as described above, and is a code for transmitting the telephone number of the other party. For example, when opening a channel, it has data of the first bit pattern and dummy data, and when it is the other party's phone number, it has data of the second bit pattern and data of that phone number. It has data (operand) indicating the type of control and data (operand) necessary for the control.

If the identification code ID is checked when making or receiving a call as described above, even if a third party prepares a handset of the same type as handset (1), the call will not be answered. or eavesdropping.

Document: Specification and drawings of Japanese Patent Application No. 63-56978 [Problem to be Solved by the Invention] By the way, when a cordless telephone as described above is used in a building, for example, the relationship of the service area of the cordless telephone is A base unit is prepared for each floor of the upper building (if the floor is large, the floor is divided into several zones, and for each zone).

However, the system identification code ID is unique to the base unit and the handset that pairs with it, and different pairs of base units and handsets have different identification code IDs. You cannot connect the handset on the floor to the base unit on another floor. Therefore, even if a base unit is provided for each floor, the range in which the handset can be carried around and used, that is, the range in which calls can be made, is limited within each floor, and the handset cannot be carried and used from one floor to another.

[Means for Solving the Problem] Therefore, in the present invention, for example, a base unit is provided for each floor, and following the original system identification code ID, the identification code ID of the base unit of the other floor is also accessed. This is how it was done.

[Effect]

Since one handset (1) can be used in multiple service areas, the range of the handset (1) can be greatly expanded.

〔Example〕

In FIG. 1, (2A), (2B), and (2C) are base units, and these base units (2A) to (2C) are base units.
2C) is connected to the telephone line (3) through an exchange (250).

Then, the ROM (241A) of the base unit (2A)
) stores the system identification code IDa, the ROM (241B) of the base unit (2B) stores the system identification code IDI, and the ROM (241C) of the base unit (2C) stores the system identification code ID. has been done. In addition, these base units) (2
Let the respective service areas of A), (2B), and (2C) be areas A, B, and C separated by dashed-dotted lines.

In addition, the RAM (141) of the handset (1) contains identification codes IDA, ID,, I
D, three are memorized.

Next, the operation of the example shown in FIG. 1 when making a call will be described.

First, in service area A, the handset (1)
When the talk key (132) is set to talk mode, the microcomputer (140) sends the identification code ■DA, IDl1. IDC is taken out and a command signal CMND having the format shown in FIG. 2B is formed. That is, this command signal CMNO has, in order from the beginning, a 24-bit bit synchronization signal BSYN, a 16-bit frame synchronization signal FSYN, a 25-bit identification code IDA, and a 15-bit error correction code ECC. The signal format is similar to the signal format in FIG. 5, but in this example, the error correction code ECC is followed by a 25-bit identification code IDa, a 15-bit error correction code ECC, a 25-bit identification code IDc, and a 25-bit identification code IDc.
It has a 5-bit error correction code FCC and a 40-bit control code CTRL.

And this system identification code IDA, ID,
.

A command signal CMND having the ID is transmitted to the base unit (2A).

Then, the microcontroller (240A) of the base unit (2A)
) are each of the identification codes IDA, ID, IDC included in the received command signal CMNO, and R
The three received identification codes IDA+ID are compared with the identification code IDA stored in the OM (2418).
It is determined whether or not there is one among the identification codes m and IDc that matches the stored identification code TDA. In this case, the received identification code IDA matches the identification code IDA stored in the ROM (2418), so the microcomputer (24OA) supplies a signal to the exchange (250). Then, the base unit (2A) becomes the exchanger (250)
The handset (1) is therefore connected to the line (3) through the base unit (2A) and the exchange (2A).
50) to the line (3).

Next, the operation when a call arrives in service area A will be explained.

First, when a call is received to the base unit (2A) through the line (3) and the exchange (250), the microcomputer (24OA) forms a command signal CMND as shown in FIG. 2A with an identification code IDA. , transmits this command signal CMNO.

In the handset (1), the command signal CMNO from the base unit (2A) is transmitted to the microcomputer (1).
40). Then, the microcomputer (140) reads the identification code included in the received command signal CMND.
DA and the three identification codes ID, ID□IDC stored in RAM (141) are compared, and the received identification code TDA is included in the three stored identification codes IDA, ID□IDC. Determine whether there is a match. In this case, among the three identification codes IDA, ID11+ [Dc, the identification code! Since it matches the identification code IDA received by DA, the microcomputer (140) drives a ringer speaker (not shown) to notify that there is an incoming call.

Therefore, when the talk switch (132) is set to talk mode, the same process as when making a call is performed and the handset (132)
) is base unit I-(2A) and replacement 41 (250
) to the line (3).

When the handset (1) is used within the service area B, the same operation as that performed in the service area A is performed. However, in service area B, although the base unit (2B) transmits a command signal CMNO having an identification code IDs, the RAM (141) of the handset (1) also stores the identification code ID. Therefore, in the same way as in the service area A, transmission and reception is possible between the handset (1) and the base unit (2B).

In addition, even within service area C, the handset (
1) RAM (141) includes base unit l-,
Since the identification code ID of (2C) is stored, transmission and reception between the handset (1) and the base unit (2B) is possible even within this service area C.

Thus, according to this embodiment, a plurality of base units
- Store the respective identification codes IDA, IDI, and IDC of (2A), (2B), and (2C) in the RAM (141) of the handset (1), and when making a call, the original Following the identification code IDA, the command signal CM? with the identification code of the other base units (2B), (2C), e.g. ID, , [Dc? /
D from the handset (1) to the base unit (2A)
, (2B) or (2C) and base unit (
2A), (2B) or (2C), the plurality of received identification codes IDA+IDIl+TD
, one of them is the base unit (2A),
If the identification code of (2B) or (2C) matches, transmission and reception with the handset (1) is permitted, and when a call is received, the base unit (2A), (2B) or (2C) returns to the handset (1). Base Unison) (2A), (2
B) or (2C), so even though it is one handset (1), it can be used in multiple service areas with its base unit (2A),
(2B) or (2C), and the handset (
1) The communication range can be greatly expanded.

In the above example, the handset (1) is configured to store a plurality of identification codes IDA, IDa, IDC, but a plurality of base units (2A)
, (2B).

(2C) A plurality of identification coats on each side, ID
,.

IDc may also be stored.

〔Effect of the invention〕

Thus, according to the present invention, multiple system identification codes can be stored in the handset or base unit, allowing a single handset to be used in multiple service areas, thereby greatly increasing the range of the handset. Can be expanded.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing an embodiment of the present invention, FIG. 2 is a diagram showing a signal format, FIG. 3 is a diagram showing how the cordless telephone is used, and FIG. 4 is an overall circuit diagram of the cordless telephone. FIG. 5 is a diagram showing the format of the signal. (1) is handset, (28') (2B) (2
C) is a base unit, (140) (240) is a microcomputer, and (141) is a RAM. (241A) (241B) (241C) are ROMs.

Claims (1)

[Scope of Claims] A handset having a memory for storing system identification codes; and a plurality of base units having memories for storing system identification codes; The individual system identification codes in the base unit are stored, and the system identification codes in the memory of the handset and the system identification codes in the memory of the base unit are compared, and when there is a matching system identification code, A cordless telephone in which a handset is connected to one of the plurality of base units.